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finish initial task driver skeleton implementation

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Luiz Aoqui 2019-11-29 18:58:03 -05:00
parent 7b455b415e
commit ad2ca32ec0
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12 changed files with 968 additions and 488 deletions
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1
.gitignore vendored Normal file
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nomad-runtime-driver-skeleton

55
Makefile
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NAME := nomad-driver-skeleton
PKG := github.com/hashicorp/$(NAME)
CGO_ENABLED := 0
# Set any default go build tags.
BUILDTAGS :=
# Set an output prefix, which is the local directory if not specified
PREFIX?=$(shell pwd)
GOOSARCHES=linux/amd64
GO=go
.PHONY: build
build: $(NAME) ## Builds a dynamic executable or package.
$(NAME): $(wildcard *.go) $(wildcard */*.go)
@echo "+ $@"
$(V)GO111MODULE=on GOOS=linux $(GO) build -tags "$(BUILDTAGS)" ${GO_LDFLAGS} -o $(NAME) ./cmd/driver/main.go
.PHONY: static
static: ## Builds a static executable.
@echo "+ $@"
CGO_ENABLED=$(CGO_ENABLED) $(GO) build \
-tags "$(BUILDTAGS) static_build" \
${GO_LDFLAGS_STATIC} -o $(NAME) .
all: clean build fmt lint test vet
.PHONY: fmt
fmt: ## Verifies all files have been `gofmt`ed.
@echo "+ $@"
@gofmt -s -l . | grep -v '.pb.go:' | grep -v vendor | tee /dev/stderr
.PHONY: test
test: ## Runs the go tests.
@echo "+ $@"
@$(GO) test -v -tags "$(BUILDTAGS) cgo" $(shell $(GO) list ./... | grep -v vendor)
.PHONY: vet
vet: ## Verifies `go vet` passes.
@echo "+ $@"
@$(GO) vet -printfuncs Error,ErrorDepth,Errorf,Errorln,Exit,ExitDepth,Exitf,Exitln,Fatal,FatalDepth,Fatalf,Fatalln,Info,InfoDepth,Infof,Infoln,Warning,WarningDepth,Warningf,Warningln -all ./...
.PHONY: clean
clean: ## Cleanup any build binaries or packages.
@echo "+ $@"
$(RM) $(NAME)
$(RM) -r $(BUILDDIR)
dep:
$(V)GO111MODULE=on go mod download
$(V)GO111MODULE=on go mod vendor
$(V)GO111MODULE=on go mod tidy

59
README.md
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# nomad-driver-skeleton
This project is a [Hashicorp Nomad](https://www.nomadproject.io/) runtime driver plugin skeleton implementation.
You can clone and modify this to get started writing your
own driver plugin.
nomad-runtime-driver-skeleton
==========
Note that this is only a skeleton to help you get started. The Makefile only builds
for linux/amd64
This project is a [Hashicorp Nomad](https://www.nomadproject.io/) [task driver
plugin](https://www.nomadproject.io/docs/drivers/index.html) skeleton
implementation. You can clone and modify this to get started writing your own
task driver plugin.
Requirements
------------
-------------------
- [Nomad](https://www.nomadproject.io/downloads.html) v0.9.5+
- [Go](https://golang.org/doc/install) v1.11+ (to build the plugin)
Get Started
-----------
-------------------
Clone repository to: `$GOPATH/src/github.com/hashicorp/nomad-driver-skeleton
Copy the files into your new driver's package and change package names as needed.
Download the project module:
```sh
$ cd $GOPATH/src/github.com/hashicorp/nomad-driver-skeleton
$ make dep
$ make build
go get github.com/hashicorp/nomad-skeleton-task-driver-plugin
```
Requirements
------------
Follow the comments marked with a `TODO` tag to implement your driver's logic.
For more information consult the Nomad documentation on
[plugins](https://www.nomadproject.io/docs/internals/plugins/index.html).
[Go](http://www.golang.org) should be installed on your machine.
You will also need to correctly setup a [GOPATH](http://golang.org/doc/code.html#GOPATH)
and add `$GOPATH/bin` to your `$PATH`.
To compile the driver plugin, run `make build`. This will build the plugin and put the task driver binary under the
NOMAD plugin dir, which by default is located under `<nomad-data-dir>/plugins/`.
Check Nomad `-data-dir` and `-plugin-dir` flags for more information.
The initial state of the skeleton is a simple task that outputs a greeting. You
can try it out by starting a Nomad server and client and running the job
provided in the `config` folder:
```sh
$ make build
go build
nomad agent -dev -config=./config/client.hcl -plugin-dir=$(PWD)
# in another shell
nomad run ./config/example.nomad
```
Makefile and project module structure were inspired by [Sylab's singularity]() driver.
You should rename the project's root folder and the `hello` module to fit your
own driver.
Code Organization
-----------------
The skeleton driver comes with an in memory task state store (see state.go).
This in-memory map is for storing runtime details (like a process id). The details
of what to store is left to the implementation of the runtime driver.
Fields stored in the base implementation in this skeleton can be found in the `taskHandle` struct.
-------------------
The skeleton driver comes with an in memory task state store (see
`hello/state.go`). This in-memory map is for storing runtime details (like a
process id). The details of what to store is left to the implementation of the
task driver. Fields stored in the base implementation in this skeleton can be
found in the `taskHandle` struct.

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config/client.hcl Normal file
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log_level = "TRACE"
plugin "nomad-runtime-driver-skeleton" {
config {
shell = "bash"
}
}

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config/example.nomad Normal file
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job "example" {
datacenters = ["dc1"]
type = "batch"
group "example" {
task "hello-world" {
driver = "hello-world-example"
config {
greeting = "hello"
}
}
}
}

120
go.mod
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@ -1,49 +1,85 @@
module github.com/hashicorp/nomad-driver-skeleton
module github.com/hashicorp/nomad-runtime-driver-skeleton
go 1.12
require (
github.com/LK4D4/joincontext v0.0.0-20171026170139-1724345da6d5 // indirect
github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6 // indirect
github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d // indirect
github.com/fsnotify/fsnotify v1.4.7 // indirect
github.com/go-ole/go-ole v1.2.2 // indirect
github.com/golang/snappy v0.0.1 // indirect
github.com/gorhill/cronexpr v0.0.0-20140423231348-a557574d6c02 // indirect
github.com/hashicorp/consul v1.0.7 // indirect
github.com/hashicorp/go-hclog v0.8.0
github.com/hashicorp/go-plugin v0.0.0-20190212232519-b838ffee39ce // indirect
github.com/hashicorp/go-retryablehttp v0.5.3 // indirect
github.com/hashicorp/go-rootcerts v0.0.0-20160503143440-6bb64b370b90 // indirect
github.com/hashicorp/go-uuid v1.0.1 // indirect
github.com/hashicorp/go-version v1.0.0 // indirect
github.com/hashicorp/hcl v0.0.0-20161101180025-6e968a3fcdcb // indirect
github.com/hashicorp/memberlist v0.1.3 // indirect
github.com/hashicorp/nomad v0.9.0-rc2
github.com/hashicorp/raft v0.0.0-20190104133720-9c733b2b7f53 // indirect
github.com/hashicorp/serf v0.0.0-20180119224300-b6017ae61f44 // indirect
github.com/hashicorp/vault v1.1.0 // indirect
github.com/hashicorp/yamux v0.0.0-20181012175058-2f1d1f20f75d // indirect
github.com/hpcloud/tail v0.0.0-20180514194441-a1dbeea552b7 // indirect
github.com/kr/pretty v0.1.0 // indirect
github.com/mitchellh/copystructure v0.0.0-20170525013902-d23ffcb85de3 // indirect
github.com/mitchellh/go-homedir v1.1.0 // indirect
github.com/mitchellh/go-testing-interface v1.0.0 // indirect
github.com/mitchellh/hashstructure v0.0.0-20160118175604-1ef5c71b025a // indirect
github.com/mitchellh/mapstructure v1.1.2 // indirect
github.com/mitchellh/reflectwalk v1.0.0 // indirect
github.com/pascaldekloe/goe v0.1.0 // indirect
github.com/pierrec/lz4 v2.0.5+incompatible // indirect
github.com/pkg/errors v0.8.1 // indirect
github.com/ryanuber/go-glob v0.0.0-20170128012129-256dc444b735 // indirect
github.com/shirou/gopsutil v0.0.0-20190131151121-071446942108 // indirect
github.com/go-ole/go-ole v1.2.4 // indirect
github.com/gorhill/cronexpr v0.0.0-20180427100037-88b0669f7d75 // indirect
github.com/hashicorp/consul-template v0.23.0
github.com/hashicorp/go-hclog v0.9.1
github.com/hashicorp/go-plugin v1.0.1
github.com/hashicorp/go-version v1.2.0 // indirect
github.com/hashicorp/nomad v0.10.0
github.com/hashicorp/raft v1.1.1 // indirect
github.com/hpcloud/tail v1.0.0 // indirect
github.com/kr/pretty v0.1.0
github.com/mitchellh/go-ps v0.0.0-20190716172923-621e5597135b // indirect
github.com/shirou/gopsutil v0.0.0-00010101000000-000000000000 // indirect
github.com/shirou/w32 v0.0.0-20160930032740-bb4de0191aa4 // indirect
github.com/ugorji/go v0.0.0-20170620060102-0053ebfd9d0e // indirect
github.com/vmihailenco/msgpack v4.0.2+incompatible // indirect
github.com/zclconf/go-cty v0.0.0-20180718220526-02bd58e97b57 // indirect
golang.org/x/sys v0.0.0-20190220154126-629670e5acc5 // indirect
golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 // indirect
google.golang.org/appengine v1.4.0 // indirect
google.golang.org/genproto v0.0.0-20190219182410-082222b4a5c5 // indirect
google.golang.org/grpc v1.18.0 // indirect
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
gopkg.in/fsnotify/fsnotify.v1 v1.4.7 // indirect
github.com/ugorji/go v0.0.0-00010101000000-000000000000 // indirect
github.com/zclconf/go-cty v1.1.0 // indirect
golang.org/x/crypto v0.0.0-20191029031824-8986dd9e96cf // indirect
google.golang.org/grpc v1.22.0
gopkg.in/fsnotify.v1 v1.4.7 // indirect
gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
)
// don't use shirou/gopsutil, use the hashicorp fork
replace github.com/shirou/gopsutil => github.com/hashicorp/gopsutil v0.0.0-20180427102116-62d5761ddb7d
// don't use ugorji/go, use the hashicorp fork
replace github.com/ugorji/go => github.com/hashicorp/go-msgpack v0.0.0-20190927083313-23165f7bc3c2
// fix the version of hashicorp/go-msgpack to 96ddbed8d05b
replace github.com/hashicorp/go-msgpack => github.com/hashicorp/go-msgpack v0.0.0-20191101193846-96ddbed8d05b
//require (
// github.com/LK4D4/joincontext v0.0.0-20171026170139-1724345da6d5 // indirect
// github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6 // indirect
// github.com/fsnotify/fsnotify v1.4.7 // indirect
// github.com/go-ole/go-ole v1.2.2 // indirect
// github.com/golang/snappy v0.0.1 // indirect
// github.com/gorhill/cronexpr v0.0.0-20140423231348-a557574d6c02 // indirect
// github.com/hashicorp/consul v1.0.7 // indirect
// github.com/hashicorp/go-hclog v0.8.0
// github.com/hashicorp/go-plugin v0.0.0-20190212232519-b838ffee39ce // indirect
// github.com/hashicorp/go-retryablehttp v0.5.3 // indirect
// github.com/hashicorp/go-rootcerts v0.0.0-20160503143440-6bb64b370b90 // indirect
// github.com/hashicorp/go-uuid v1.0.1 // indirect
// github.com/hashicorp/go-version v1.0.0 // indirect
// github.com/hashicorp/hcl v0.0.0-20161101180025-6e968a3fcdcb // indirect
// github.com/hashicorp/memberlist v0.1.3 // indirect
// github.com/hashicorp/nomad v0.9.0-rc2
// github.com/hashicorp/raft v0.0.0-20190104133720-9c733b2b7f53 // indirect
// github.com/hashicorp/serf v0.0.0-20180119224300-b6017ae61f44 // indirect
// github.com/hashicorp/vault v1.1.0 // indirect
// github.com/hashicorp/yamux v0.0.0-20181012175058-2f1d1f20f75d // indirect
// github.com/hpcloud/tail v0.0.0-20180514194441-a1dbeea552b7 // indirect
// github.com/kr/pretty v0.1.0 // indirect
// github.com/mitchellh/copystructure v0.0.0-20170525013902-d23ffcb85de3 // indirect
// github.com/mitchellh/go-homedir v1.1.0 // indirect
// github.com/mitchellh/go-testing-interface v1.0.0 // indirect
// github.com/mitchellh/hashstructure v0.0.0-20160118175604-1ef5c71b025a // indirect
// github.com/mitchellh/mapstructure v1.1.2 // indirect
// github.com/mitchellh/reflectwalk v1.0.0 // indirect
// github.com/pascaldekloe/goe v0.1.0 // indirect
// github.com/pierrec/lz4 v2.0.5+incompatible // indirect
// github.com/pkg/errors v0.8.1 // indirect
// github.com/ryanuber/go-glob v0.0.0-20170128012129-256dc444b735 // indirect
// github.com/shirou/gopsutil v0.0.0-20190131151121-071446942108 // indirect
// github.com/shirou/w32 v0.0.0-20160930032740-bb4de0191aa4 // indirect
// github.com/ugorji/go v0.0.0-20170620060102-0053ebfd9d0e // indirect
// github.com/vmihailenco/msgpack v4.0.2+incompatible // indirect
// github.com/zclconf/go-cty v0.0.0-20180718220526-02bd58e97b57 // indirect
// golang.org/x/sys v0.0.0-20190220154126-629670e5acc5 // indirect
// golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 // indirect
// google.golang.org/appengine v1.4.0 // indirect
// google.golang.org/genproto v0.0.0-20190219182410-082222b4a5c5 // indirect
// google.golang.org/grpc v1.18.0 // indirect
// gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
// gopkg.in/fsnotify/fsnotify.v1 v1.4.7 // indirect
// gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
//)

170
go.sum
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@ -1,94 +1,199 @@
cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/DataDog/datadog-go v2.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ=
github.com/LK4D4/joincontext v0.0.0-20171026170139-1724345da6d5 h1:U7q69tqXiCf6m097GRlNQB0/6SI1qWIOHYHhCEvDxF4=
github.com/LK4D4/joincontext v0.0.0-20171026170139-1724345da6d5/go.mod h1:nxQPcNPR/34g+HcK2hEsF99O+GJgIkW/OmPl8wtzhmk=
github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6 h1:fLjPD/aNc3UIOA6tDi6QXUemppXK3P9BI7mr2hd6gx8=
github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
github.com/apparentlymart/go-textseg v1.0.0/go.mod h1:z96Txxhf3xSFMPmb5X/1W05FF/Nj9VFpLOpjS5yuumk=
github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e h1:QEF07wC0T1rKkctt1RINW/+RMTVmiwxETico2l3gxJA=
github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da h1:8GUt8eRujhVEGZFFEjBj46YV4rDjvGrNxb0KMWYkL2I=
github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
github.com/armon/go-metrics v0.0.0-20190430140413-ec5e00d3c878 h1:EFSB7Zo9Eg91v7MJPVsifUysc/wPdN+NOnVe6bWbdBM=
github.com/armon/go-metrics v0.0.0-20190430140413-ec5e00d3c878/go.mod h1:3AMJUQhVx52RsWOnlkpikZr01T/yAVN2gn0861vByNg=
github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
github.com/boltdb/bolt v1.3.1/go.mod h1:clJnj/oiGkjum5o1McbSZDSLxVThjynRyGBgiAx27Ps=
github.com/circonus-labs/circonus-gometrics v2.3.1+incompatible/go.mod h1:nmEj6Dob7S7YxXgwXpfOuvO54S+tGdZdw9fuRZt25Ag=
github.com/circonus-labs/circonusllhist v0.1.3/go.mod h1:kMXHVDlOchFAehlya5ePtbp5jckzBHf4XRpQvBOLI+I=
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
github.com/fatih/structs v1.1.0/go.mod h1:9NiDSp5zOcgEDl+j00MP/WkGVPOlPRLejGD8Ga6PJ7M=
github.com/frankban/quicktest v1.4.0/go.mod h1:36zfPVQyHxymz4cH7wlDmVwDrJuljRB60qkgn7rorfQ=
github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
github.com/go-ldap/ldap v3.0.2+incompatible/go.mod h1:qfd9rJvER9Q0/D/Sqn1DfHRoBp40uXYvFoEVrNEPqRc=
github.com/go-ole/go-ole v1.2.2 h1:QNWhweRd9D5Py2rRVboZ2L4SEoW/dyraWJCc8bgS8kE=
github.com/go-ole/go-ole v1.2.2/go.mod h1:pnvuG7BrDMZ8ifMurTQmxwhQM/odqm9sSqNe5BUI7v4=
github.com/go-ole/go-ole v1.2.4/go.mod h1:XCwSNxSkXRo4vlyPy93sltvi/qJq0jqQhjqQNIwKuxM=
github.com/go-test/deep v1.0.2-0.20181118220953-042da051cf31/go.mod h1:wGDj63lr65AM2AQyKZd/NYHGb0R+1RLqB8NKt3aSFNA=
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
github.com/golang/lint v0.0.0-20180702182130-06c8688daad7/go.mod h1:tluoj9z5200jBnyusfRPU2LqT6J+DAorxEvtC7LHB+E=
github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
github.com/golang/protobuf v1.1.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/golang/protobuf v1.3.1 h1:YF8+flBXS5eO826T4nzqPrxfhQThhXl0YzfuUPu4SBg=
github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/golang/snappy v0.0.1 h1:Qgr9rKW7uDUkrbSmQeiDsGa8SjGyCOGtuasMWwvp2P4=
github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c h1:964Od4U6p2jUkFxvCydnIczKteheJEzHRToSGK3Bnlw=
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github.com/mitchellh/copystructure v0.0.0-20170525013902-d23ffcb85de3 h1:dECZqiJYhKdj9QlLpiQaRDXHDXRTdiyZI3owdDGhlYY=
github.com/mitchellh/copystructure v0.0.0-20170525013902-d23ffcb85de3/go.mod h1:eOsF2yLPlBBJPvD+nhl5QMTBSOBbOph6N7j/IDUw7PY=
github.com/mitchellh/copystructure v1.0.0 h1:Laisrj+bAB6b/yJwB5Bt3ITZhGJdqmxquMKeZ+mmkFQ=
github.com/mitchellh/copystructure v1.0.0/go.mod h1:SNtv71yrdKgLRyLFxmLdkAbkKEFWgYaq1OVrnRcwhnw=
github.com/mitchellh/go-homedir v1.0.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
github.com/mitchellh/go-homedir v1.1.0 h1:lukF9ziXFxDFPkA1vsr5zpc1XuPDn/wFntq5mG+4E0Y=
github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
github.com/mitchellh/go-ps v0.0.0-20190716172923-621e5597135b h1:9+ke9YJ9KGWw5ANXK6ozjoK47uI3uNbXv4YVINBnGm8=
github.com/mitchellh/go-ps v0.0.0-20190716172923-621e5597135b/go.mod h1:r1VsdOzOPt1ZSrGZWFoNhsAedKnEd6r9Np1+5blZCWk=
github.com/mitchellh/go-testing-interface v0.0.0-20171004221916-a61a99592b77/go.mod h1:kRemZodwjscx+RGhAo8eIhFbs2+BFgRtFPeD/KE+zxI=
github.com/mitchellh/go-testing-interface v1.0.0 h1:fzU/JVNcaqHQEcVFAKeR41fkiLdIPrefOvVG1VZ96U0=
github.com/mitchellh/go-testing-interface v1.0.0/go.mod h1:kRemZodwjscx+RGhAo8eIhFbs2+BFgRtFPeD/KE+zxI=
github.com/mitchellh/go-wordwrap v1.0.0/go.mod h1:ZXFpozHsX6DPmq2I0TCekCxypsnAUbP2oI0UX1GXzOo=
github.com/mitchellh/gox v0.4.0/go.mod h1:Sd9lOJ0+aimLBi73mGofS1ycjY8lL3uZM3JPS42BGNg=
github.com/mitchellh/hashstructure v0.0.0-20160118175604-1ef5c71b025a h1:2p2+qxgbcNvMPt/Q/Nfd0mEHJokUf7rHAYDVQH1dKpM=
github.com/mitchellh/hashstructure v0.0.0-20160118175604-1ef5c71b025a/go.mod h1:QjSHrPWS+BGUVBYkbTZWEnOh3G1DutKwClXU/ABz6AQ=
github.com/mitchellh/hashstructure v1.0.0 h1:ZkRJX1CyOoTkar7p/mLS5TZU4nJ1Rn/F8u9dGS02Q3Y=
github.com/mitchellh/hashstructure v1.0.0/go.mod h1:QjSHrPWS+BGUVBYkbTZWEnOh3G1DutKwClXU/ABz6AQ=
github.com/mitchellh/iochan v1.0.0/go.mod h1:JwYml1nuB7xOzsp52dPpHFffvOCDupsG0QubkSMEySY=
github.com/mitchellh/mapstructure v0.0.0-20160808181253-ca63d7c062ee/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
github.com/mitchellh/mapstructure v1.1.2 h1:fmNYVwqnSfB9mZU6OS2O6GsXM+wcskZDuKQzvN1EDeE=
github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
github.com/mitchellh/reflectwalk v1.0.0 h1:9D+8oIskB4VJBN5SFlmc27fSlIBZaov1Wpk/IfikLNY=
@ -100,12 +205,22 @@ github.com/pascaldekloe/goe v0.1.0 h1:cBOtyMzM9HTpWjXfbbunk26uA6nG3a8n06Wieeh0Mw
github.com/pascaldekloe/goe v0.1.0/go.mod h1:lzWF7FIEvWOWxwDKqyGYQf6ZUaNfKdP144TG7ZOy1lc=
github.com/pierrec/lz4 v2.0.5+incompatible h1:2xWsjqPFWcplujydGg4WmhC/6fZqK42wMM8aXeqhl0I=
github.com/pierrec/lz4 v2.0.5+incompatible/go.mod h1:pdkljMzZIN41W+lC3N2tnIh5sFi+IEE17M5jbnwPHcY=
github.com/pierrec/lz4 v2.2.5+incompatible/go.mod h1:pdkljMzZIN41W+lC3N2tnIh5sFi+IEE17M5jbnwPHcY=
github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/posener/complete v1.1.1/go.mod h1:em0nMJCgc9GFtwrmVmEMR/ZL6WyhyjMBndrE9hABlRI=
github.com/prometheus/client_golang v0.9.2/go.mod h1:OsXs2jCmiKlQ1lTBmv21f2mNfw4xf/QclQDMrYNZzcM=
github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
github.com/prometheus/common v0.0.0-20181126121408-4724e9255275/go.mod h1:daVV7qP5qjZbuso7PdcryaAu0sAZbrN9i7WWcTMWvro=
github.com/prometheus/procfs v0.0.0-20181204211112-1dc9a6cbc91a/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
github.com/ryanuber/columnize v0.0.0-20160712163229-9b3edd62028f/go.mod h1:sm1tb6uqfes/u+d4ooFouqFdy9/2g9QGwK3SQygK0Ts=
github.com/ryanuber/columnize v2.1.0+incompatible/go.mod h1:sm1tb6uqfes/u+d4ooFouqFdy9/2g9QGwK3SQygK0Ts=
github.com/ryanuber/go-glob v0.0.0-20170128012129-256dc444b735 h1:7YvPJVmEeFHR1Tj9sZEYsmarJEQfMVYpd/Vyy/A8dqE=
github.com/ryanuber/go-glob v0.0.0-20170128012129-256dc444b735/go.mod h1:807d1WSdnB0XRJzKNil9Om6lcp/3a0v4qIHxIXzX/Yc=
github.com/ryanuber/go-glob v1.0.0 h1:iQh3xXAumdQ+4Ufa5b25cRpC5TYKlno6hsv6Cb3pkBk=
github.com/ryanuber/go-glob v1.0.0/go.mod h1:807d1WSdnB0XRJzKNil9Om6lcp/3a0v4qIHxIXzX/Yc=
github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529 h1:nn5Wsu0esKSJiIVhscUtVbo7ada43DJhG55ua/hjS5I=
github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529/go.mod h1:DxrIzT+xaE7yg65j358z/aeFdxmN0P9QXhEzd20vsDc=
github.com/shirou/gopsutil v0.0.0-20190131151121-071446942108 h1:XXgDK65TPH+Qbo2sdYHldM5avclwThBXVYZHxroFkTQ=
@ -116,50 +231,105 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/tv42/httpunix v0.0.0-20150427012821-b75d8614f926/go.mod h1:9ESjWnEqriFuLhtthL60Sar/7RFoluCcXsuvEwTV5KM=
github.com/ugorji/go v0.0.0-20170620060102-0053ebfd9d0e h1:Eurc/1QbldPTy6eU1WSHOH1vuFc7BAUdKDWSsZd4ieo=
github.com/ugorji/go v0.0.0-20170620060102-0053ebfd9d0e/go.mod h1:hnLbHMwcvSihnDhEfx2/BzKp2xb0Y+ErdfYcrs9tkJQ=
github.com/vmihailenco/msgpack v3.3.3+incompatible h1:wapg9xDUZDzGCNFlwc5SqI1rvcciqcxEHac4CYj89xI=
github.com/vmihailenco/msgpack v3.3.3+incompatible/go.mod h1:fy3FlTQTDXWkZ7Bh6AcGMlsjHatGryHQYUTf1ShIgkk=
github.com/vmihailenco/msgpack v4.0.2+incompatible h1:6ujmmycMfB62Mwv2N4atpnf8CKLSzhgodqMenpELKIQ=
github.com/vmihailenco/msgpack v4.0.2+incompatible/go.mod h1:fy3FlTQTDXWkZ7Bh6AcGMlsjHatGryHQYUTf1ShIgkk=
github.com/zclconf/go-cty v0.0.0-20180718220526-02bd58e97b57 h1:FWjfWQtNK83IJMe58FfMCSNkySe0PO9TvrQyLOKcPxw=
github.com/zclconf/go-cty v0.0.0-20180718220526-02bd58e97b57/go.mod h1:LnDKxj8gN4aatfXUqmUNooaDjvmDcLPbAN3hYBIVoJE=
github.com/zclconf/go-cty v1.1.0 h1:uJwc9HiBOCpoKIObTQaLR+tsEXx1HBHnOsOOpcdhZgw=
github.com/zclconf/go-cty v1.1.0/go.mod h1:xnAOWiHeOqg2nWS62VtQ7pbOu17FtxJNW8RLEih+O3s=
golang.org/x/crypto v0.0.0-20181029021203-45a5f77698d3 h1:KYQXGkl6vs02hK7pK4eIbw0NpNPedieTSTEiJ//bwGs=
golang.org/x/crypto v0.0.0-20181029021203-45a5f77698d3/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20191029031824-8986dd9e96cf h1:fnPsqIDRbCSgumaMCRpoIoF2s4qxv0xSSS0BVZUE/ss=
golang.org/x/crypto v0.0.0-20191029031824-8986dd9e96cf/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
golang.org/x/lint v0.0.0-20180702182130-06c8688daad7/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20180811021610-c39426892332/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20181023162649-9b4f9f5ad519/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20181106065722-10aee1819953 h1:LuZIitY8waaxUfNIdtajyE/YzA/zyf0YxXG27VpLrkg=
golang.org/x/net v0.0.0-20181106065722-10aee1819953/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20181201002055-351d144fa1fc/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190620200207-3b0461eec859 h1:R/3boaszxrf1GEUWTVDzSKVwLmSJpwZ1yqXm8j0v2QI=
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20190724013045-ca1201d0de80 h1:Ao/3l156eZf2AW5wK8a7/smtodRU+gha3+BeqJ69lRk=
golang.org/x/net v0.0.0-20190724013045-ca1201d0de80/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4 h1:YUO/7uOKsKeq9UokNS62b8FYywz3ker1l1vDZRCRefw=
golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20180823144017-11551d06cbcc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20181026203630-95b1ffbd15a5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190129075346-302c3dd5f1cc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190220154126-629670e5acc5 h1:3Nsfe5Xa1wTt01QxlAFIY5j9ycDtS+d7mhvI8ZY5bn0=
golang.org/x/sys v0.0.0-20190220154126-629670e5acc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190403152447-81d4e9dc473e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20190523142557-0e01d883c5c5 h1:sM3evRHxE/1RuMe1FYAL3j7C7fUfIjkbE+NiDAYUF8U=
golang.org/x/sys v0.0.0-20190523142557-0e01d883c5c5/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20190730183949-1393eb018365 h1:SaXEMXhWzMJThc05vu6uh61Q245r4KaWMrsTedk0FDc=
golang.org/x/sys v0.0.0-20190730183949-1393eb018365/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.1-0.20181227161524-e6919f6577db h1:6/JqlYfC1CCaLnGceQTI+sDGhC9UBSPAsBqI0Gun6kU=
golang.org/x/text v0.3.1-0.20181227161524-e6919f6577db/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 h1:SvFZT6jyqRaOeXpc5h/JSfZenJ2O330aBsf7JfSUXmQ=
golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
golang.org/x/tools v0.0.0-20180828015842-6cd1fcedba52/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
golang.org/x/tools v0.0.0-20190424220101-1e8e1cfdf96b/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
google.golang.org/appengine v1.4.0 h1:/wp5JvzpHIxhs/dumFmF7BXTf3Z+dd4uXta4kVyO508=
google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
google.golang.org/genproto v0.0.0-20190219182410-082222b4a5c5 h1:SdCO7As+ChE1iV3IjBleIIWlj8VjZWuYEUF5pjELOOQ=
google.golang.org/genproto v0.0.0-20190219182410-082222b4a5c5/go.mod h1:L3J43x8/uS+qIUoksaLKe6OS3nUKxOKuIFz1sl2/jx4=
google.golang.org/genproto v0.0.0-20190404172233-64821d5d2107 h1:xtNn7qFlagY2mQNFHMSRPjT2RkOV4OXM7P5TVy9xATo=
google.golang.org/genproto v0.0.0-20190404172233-64821d5d2107/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
google.golang.org/grpc v1.14.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
google.golang.org/grpc v1.16.0/go.mod h1:0JHn/cJsOMiMfNA9+DeHDlAU7KAAB5GDlYFpa9MZMio=
google.golang.org/grpc v1.18.0 h1:IZl7mfBGfbhYx2p2rKRtYgDFw6SBz+kclmxYrCksPPA=
google.golang.org/grpc v1.18.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
google.golang.org/grpc v1.22.0 h1:J0UbZOIrCAl+fpTOf8YLs4dJo8L/owV4LYVtAXQoPkw=
google.golang.org/grpc v1.22.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
gopkg.in/asn1-ber.v1 v1.0.0-20181015200546-f715ec2f112d/go.mod h1:cuepJuh7vyXfUyUwEgHQXw849cJrilpS5NeIjOWESAw=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
gopkg.in/fsnotify/fsnotify.v1 v1.4.7 h1:XNNYLJHt73EyYiCZi6+xjupS9CpvmiDgjPTAjrBlQbo=
gopkg.in/fsnotify/fsnotify.v1 v1.4.7/go.mod h1:Fyux9zXlo4rWoMSIzpn9fDAYjalPqJ/K1qJ27s+7ltE=
gopkg.in/square/go-jose.v2 v2.3.1 h1:SK5KegNXmKmqE342YYN2qPHEnUYeoMiXXl1poUlI+o4=
gopkg.in/square/go-jose.v2 v2.3.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

640
hello/driver.go Normal file
View file

@ -0,0 +1,640 @@
package hello
import (
"context"
"fmt"
"os"
"os/exec"
"path/filepath"
"regexp"
"time"
"github.com/hashicorp/consul-template/signals"
"github.com/hashicorp/go-hclog"
log "github.com/hashicorp/go-hclog"
"github.com/hashicorp/nomad/drivers/shared/eventer"
"github.com/hashicorp/nomad/drivers/shared/executor"
"github.com/hashicorp/nomad/plugins/base"
"github.com/hashicorp/nomad/plugins/drivers"
"github.com/hashicorp/nomad/plugins/shared/hclspec"
"github.com/hashicorp/nomad/plugins/shared/structs"
)
const (
// pluginName is the name of the plugin
// this is used for logging and (along with the version) for uniquely
// identifying plugin binaries fingerprinted by the client
pluginName = "hello-world-example"
// pluginVersion allows the client to identify and use newer versions of
// an installed plugin
pluginVersion = "v0.1.0"
// fingerprintPeriod is the interval at which the plugin will send
// fingerprint responses
fingerprintPeriod = 30 * time.Second
// taskHandleVersion is the version of task handle which this plugin sets
// and understands how to decode
// this is used to allow modification and migration of the task schema
// used by the plugin
taskHandleVersion = 1
)
var (
// pluginInfo describes the plugin
pluginInfo = &base.PluginInfoResponse{
Type: base.PluginTypeDriver,
PluginApiVersions: []string{drivers.ApiVersion010},
PluginVersion: pluginVersion,
Name: pluginName,
}
// configSpec is the specification of the plugin's configuration
// this is used to validate the configuration specified for the plugin
// on the client.
// this is not global, but can be specified on a per-client basis.
configSpec = hclspec.NewObject(map[string]*hclspec.Spec{
// TODO: define plugin's agent configuration schema.
//
// The schema should be defined using HCL specs and it will be used to
// validate the agent configuration provided by the user in the
// `plugin` stanza (https://www.nomadproject.io/docs/configuration/plugin.html).
//
// For example, for the schema below a valid configuration would be:
//
// plugin "hello-driver-plugin" {
// config {
// shell = "fish"
// }
// }
"shell": hclspec.NewDefault(
hclspec.NewAttr("shell", "string", false),
hclspec.NewLiteral(`"bash"`),
),
})
// taskConfigSpec is the specification of the plugin's configuration for
// a task
// this is used to validated the configuration specified for the plugin
// when a job is submitted.
taskConfigSpec = hclspec.NewObject(map[string]*hclspec.Spec{
// TODO: define plugin's task configuration schema
//
// The schema should be defined using HCL specs and it will be used to
// validate the task configuration provided by the user when they
// submit a job.
//
// For example, for the schema below a valid task would be:
// job "example" {
// group "example" {
// task "say-hi" {
// driver = "hello-driver-plugin"
// config {
// greeting = "Hi"
// }
// }
// }
// }
"greeting": hclspec.NewDefault(
hclspec.NewAttr("greeting", "string", false),
hclspec.NewLiteral(`"Hello, World!"`),
),
})
// capabilities indicates what optional features this driver supports
// this should be set according to the target run time.
capabilities = &drivers.Capabilities{
// TODO: set plugin's capabilities
//
// The plugin's capabilities signal Nomad which extra functionalities
// are supported. For a list of available options check the docs page:
// https://godoc.org/github.com/hashicorp/nomad/plugins/drivers#Capabilities
SendSignals: true,
Exec: false,
}
)
// Config contains configuration information for the plugin
type Config struct {
// TODO: create decoded plugin configuration struct
//
// This struct is the decoded version of the schema defined in the
// configSpec variable above. It's used to convert the HCL configuration
// passed by the Nomad agent into Go contructs.
Shell string `codec:"shell"`
}
// TaskConfig contains configuration information for a task that runs with
// this plugin
type TaskConfig struct {
// TODO: create decoded plugin task configuration struct
//
// This struct is the decoded version of the schema defined in the
// taskConfigSpec variable above. It's used to convert the string
// configuration for the task into Go contructs.
Greeting string `codec:"greeting"`
}
// TaskState is the runtime state which is encoded in the handle returned to
// Nomad client.
// This information is needed to rebuild the task state and handler during
// recovery.
type TaskState struct {
ReattachConfig *structs.ReattachConfig
TaskConfig *drivers.TaskConfig
StartedAt time.Time
// TODO: add any extra important values that must be persisted in order
// to restore a task.
//
// The plugin keeps track of its running tasks in a in-memory data
// structure. If the plugin crashes, this data will be lost, so Nomad
// will respawn a new instance of the plugin and try to restore its
// in-memory representation of the running tasks using the RecoverTask()
// method below.
Pid int
}
// HelloDriverPlugin is an example driver plugin. When provisioned in a job,
// the taks will output a greet specified by the user.
type HelloDriverPlugin struct {
// eventer is used to handle multiplexing of TaskEvents calls such that an
// event can be broadcast to all callers
eventer *eventer.Eventer
// config is the plugin configuration set by the SetConfig RPC
config *Config
// nomadConfig is the client config from Nomad
nomadConfig *base.ClientDriverConfig
// tasks is the in memory datastore mapping taskIDs to driver handles
tasks *taskStore
// ctx is the context for the driver. It is passed to other subsystems to
// coordinate shutdown
ctx context.Context
// signalShutdown is called when the driver is shutting down and cancels
// the ctx passed to any subsystems
signalShutdown context.CancelFunc
// logger will log to the Nomad agent
logger log.Logger
}
// NewPlugin returns a new example driver plugin
func NewPlugin(logger log.Logger) drivers.DriverPlugin {
ctx, cancel := context.WithCancel(context.Background())
logger = logger.Named(pluginName)
return &HelloDriverPlugin{
eventer: eventer.NewEventer(ctx, logger),
config: &Config{},
tasks: newTaskStore(),
ctx: ctx,
signalShutdown: cancel,
logger: logger,
}
}
// PluginInfo returns information describing the plugin.
func (d *HelloDriverPlugin) PluginInfo() (*base.PluginInfoResponse, error) {
return pluginInfo, nil
}
// ConfigSchema returns the plugin configuration schema.
func (d *HelloDriverPlugin) ConfigSchema() (*hclspec.Spec, error) {
return configSpec, nil
}
// SetConfig is called by the client to pass the configuration for the plugin.
func (d *HelloDriverPlugin) SetConfig(cfg *base.Config) error {
var config Config
if len(cfg.PluginConfig) != 0 {
if err := base.MsgPackDecode(cfg.PluginConfig, &config); err != nil {
return err
}
}
// Save the configuration to the plugin
d.config = &config
// TODO: parse and validated any configuration value if necessary.
//
// If your driver agent configuration requires any complex validation
// (some dependency between attributes) or special data parsing (the
// string "10s" into a time.Interval) you can do it here and update the
// value in d.config.
//
// In the example below we check if the shell specified by the user is
// supported by the plugin.
shell := d.config.Shell
if shell != "bash" && shell != "fish" {
return fmt.Errorf("invalid shell %s", d.config.Shell)
}
// Save the Nomad agent configuration
if cfg.AgentConfig != nil {
d.nomadConfig = cfg.AgentConfig.Driver
}
// TODO: initialize any extra requirements if necessary.
//
// Here you can use the config values to initialize any resources that are
// shared by all tasks that use this driver, such as a daemon process.
return nil
}
// TaskConfigSchema returns the HCL schema for the configuration of a task.
func (d *HelloDriverPlugin) TaskConfigSchema() (*hclspec.Spec, error) {
return taskConfigSpec, nil
}
// Capabilities returns the features supported by the driver.
func (d *HelloDriverPlugin) Capabilities() (*drivers.Capabilities, error) {
return capabilities, nil
}
// Fingerprint returns a channel that will be used to send health information
// and other driver specific node attributes.
func (d *HelloDriverPlugin) Fingerprint(ctx context.Context) (<-chan *drivers.Fingerprint, error) {
ch := make(chan *drivers.Fingerprint)
go d.handleFingerprint(ctx, ch)
return ch, nil
}
// handleFingerprint manages the channel and the flow of fingerprint data.
func (d *HelloDriverPlugin) handleFingerprint(ctx context.Context, ch chan<- *drivers.Fingerprint) {
defer close(ch)
// Nomad expects the initial fingerprint to be sent immediately
ticker := time.NewTimer(0)
for {
select {
case <-ctx.Done():
return
case <-d.ctx.Done():
return
case <-ticker.C:
// after the initial fingerprint we can set the proper fingerprint
// period
ticker.Reset(fingerprintPeriod)
ch <- d.buildFingerprint()
}
}
}
// buildFingerprint returns the driver's fingerprint data
func (d *HelloDriverPlugin) buildFingerprint() *drivers.Fingerprint {
fp := &drivers.Fingerprint{
Attributes: map[string]*structs.Attribute{},
Health: drivers.HealthStateHealthy,
HealthDescription: drivers.DriverHealthy,
}
// TODO: implement fingerprinting logic to populate health and driver
// attributes.
//
// Fingerprinting is used by the plugin to relay two important information
// to Nomad: health state and node attributes.
//
// If the plugin reports to be unhealthy, or doesn't send any fingerprint
// data in the expected interval of time, Nomad will restart it.
//
// Node attributes can be used to report any relevant information about
// the node in which the plugin is running (specific library availability,
// installed versions of a software etc.). These attributes can then be
// used by an operator to set job constrains.
//
// In the example below we check if the shell specified by the user exists
// in the node.
shell := d.config.Shell
cmd := exec.Command("which", shell)
if err := cmd.Run(); err != nil {
return &drivers.Fingerprint{
Health: drivers.HealthStateUndetected,
HealthDescription: fmt.Sprintf("shell %s not found", shell),
}
}
// We also set the shell and its version as attributes
cmd = exec.Command(shell, "--version")
if out, err := cmd.Output(); err != nil {
d.logger.Warn("failed to find shell version: %v", err)
} else {
re := regexp.MustCompile("[0-9]\\.[0-9]\\.[0-9]")
version := re.FindString(string(out))
fp.Attributes["driver.hello.shell_version"] = structs.NewStringAttribute(version)
fp.Attributes["driver.hello.shell"] = structs.NewStringAttribute(shell)
}
return fp
}
// StartTask returns a task handle and a driver network if necessary.
func (d *HelloDriverPlugin) StartTask(cfg *drivers.TaskConfig) (*drivers.TaskHandle, *drivers.DriverNetwork, error) {
if _, ok := d.tasks.Get(cfg.ID); ok {
return nil, nil, fmt.Errorf("task with ID %q already started", cfg.ID)
}
var driverConfig TaskConfig
if err := cfg.DecodeDriverConfig(&driverConfig); err != nil {
return nil, nil, fmt.Errorf("failed to decode driver config: %v", err)
}
d.logger.Info("starting task", "driver_cfg", hclog.Fmt("%+v", driverConfig))
handle := drivers.NewTaskHandle(taskHandleVersion)
handle.Config = cfg
// TODO: implement driver specific mechanism to start the task.
//
// Once the task is started you will need to store any relevant runtime
// information in a taskHandle and TaskState. The taskHandle will be
// stored in-memory in the plugin and will be used to interact with the
// task.
//
// The TaskState will be returned to the Nomad client inside a
// drivers.TaskHandle instance. This TaskHandle will be sent back to plugin
// if the task ever needs to be recovered, so the TaskState should contain
// enough information to handle that.
//
// In the example below we use an executor to fork a process to run our
// greeter. The executor is then stored in the handle so we can access it
// later and the the plugin.Client is used to generate a reattach
// configuration that can be used to recover communication with the task.
executorConfig := &executor.ExecutorConfig{
LogFile: filepath.Join(cfg.TaskDir().Dir, "executor.out"),
LogLevel: "debug",
}
exec, pluginClient, err := executor.CreateExecutor(d.logger, d.nomadConfig, executorConfig)
if err != nil {
return nil, nil, fmt.Errorf("failed to create executor: %v", err)
}
echoCmd := fmt.Sprintf(`echo "%s"`, driverConfig.Greeting)
execCmd := &executor.ExecCommand{
Cmd: d.config.Shell,
Args: []string{"-c", echoCmd},
StdoutPath: cfg.StdoutPath,
StderrPath: cfg.StderrPath,
}
ps, err := exec.Launch(execCmd)
if err != nil {
pluginClient.Kill()
return nil, nil, fmt.Errorf("failed to launch command with executor: %v", err)
}
h := &taskHandle{
exec: exec,
pid: ps.Pid,
pluginClient: pluginClient,
taskConfig: cfg,
procState: drivers.TaskStateRunning,
startedAt: time.Now().Round(time.Millisecond),
logger: d.logger,
}
driverState := TaskState{
ReattachConfig: structs.ReattachConfigFromGoPlugin(pluginClient.ReattachConfig()),
Pid: ps.Pid,
TaskConfig: cfg,
StartedAt: h.startedAt,
}
if err := handle.SetDriverState(&driverState); err != nil {
return nil, nil, fmt.Errorf("failed to set driver state: %v", err)
}
d.tasks.Set(cfg.ID, h)
go h.run()
return handle, nil, nil
}
// RecoverTask recreates the in-memory state of a task from a TaskHandle.
func (d *HelloDriverPlugin) RecoverTask(handle *drivers.TaskHandle) error {
if handle == nil {
return fmt.Errorf("error: handle cannot be nil")
}
if _, ok := d.tasks.Get(handle.Config.ID); ok {
return nil
}
var taskState TaskState
if err := handle.GetDriverState(&taskState); err != nil {
return fmt.Errorf("failed to decode task state from handle: %v", err)
}
var driverConfig TaskConfig
if err := taskState.TaskConfig.DecodeDriverConfig(&driverConfig); err != nil {
return fmt.Errorf("failed to decode driver config: %v", err)
}
// TODO: implement driver specific logic to recover a task.
//
// Recovering a task involves recreating and storing a taskHandle as if the
// task was just started.
//
// In the example below we use the executor to re-attach to the process
// that was created when the task first started.
plugRC, err := structs.ReattachConfigToGoPlugin(taskState.ReattachConfig)
if err != nil {
return fmt.Errorf("failed to build ReattachConfig from taskConfig state: %v", err)
}
execImpl, pluginClient, err := executor.ReattachToExecutor(plugRC, d.logger)
if err != nil {
return fmt.Errorf("failed to reattach to executor: %v", err)
}
h := &taskHandle{
exec: execImpl,
pid: taskState.Pid,
pluginClient: pluginClient,
taskConfig: taskState.TaskConfig,
procState: drivers.TaskStateRunning,
startedAt: taskState.StartedAt,
exitResult: &drivers.ExitResult{},
}
d.tasks.Set(taskState.TaskConfig.ID, h)
go h.run()
return nil
}
// WaitTask returns a channel used to notify Nomad when a task exits.
func (d *HelloDriverPlugin) WaitTask(ctx context.Context, taskID string) (<-chan *drivers.ExitResult, error) {
handle, ok := d.tasks.Get(taskID)
if !ok {
return nil, drivers.ErrTaskNotFound
}
ch := make(chan *drivers.ExitResult)
go d.handleWait(ctx, handle, ch)
return ch, nil
}
func (d *HelloDriverPlugin) handleWait(ctx context.Context, handle *taskHandle, ch chan *drivers.ExitResult) {
defer close(ch)
var result *drivers.ExitResult
// TODO: implement driver specific logic to notify Nomad the task has been
// completed and what was the exit result.
//
// When a result is sent in the result channel Nomad will stop the task and
// emit an event that an operator can use to get an insight on why the task
// stopped.
//
// In the example below we block and wait until the executor finishes
// running, at which point we send the exit code and signal in the result
// channel.
ps, err := handle.exec.Wait(ctx)
if err != nil {
result = &drivers.ExitResult{
Err: fmt.Errorf("executor: error waiting on process: %v", err),
}
} else {
result = &drivers.ExitResult{
ExitCode: ps.ExitCode,
Signal: ps.Signal,
}
}
for {
select {
case <-ctx.Done():
return
case <-d.ctx.Done():
return
case ch <- result:
}
}
}
// StopTask stops a running task with the given signal and within the timeout window.
func (d *HelloDriverPlugin) StopTask(taskID string, timeout time.Duration, signal string) error {
handle, ok := d.tasks.Get(taskID)
if !ok {
return drivers.ErrTaskNotFound
}
// TODO: implement driver specific logic to stop a task.
//
// The StopTask function is expected to stop a running task by sending the
// given signal to it. If the task does not stop during the given timeout,
// the driver must forcefully kill the task.
//
// In the example below we let the executor handle the task shutdown
// process for us, but you might need to customize this for your own
// implementation.
if err := handle.exec.Shutdown(signal, timeout); err != nil {
if handle.pluginClient.Exited() {
return nil
}
return fmt.Errorf("executor Shutdown failed: %v", err)
}
return nil
}
// DestroyTask cleans up and removes a task that has terminated.
func (d *HelloDriverPlugin) DestroyTask(taskID string, force bool) error {
handle, ok := d.tasks.Get(taskID)
if !ok {
return drivers.ErrTaskNotFound
}
if handle.IsRunning() && !force {
return fmt.Errorf("cannot destroy running task")
}
// TODO: implement driver specific logic to destroy a complete task.
//
// Destroying a task includes removing any resources used by task and any
// local references in the plugin. If force is set to true the task should
// be destroyed even if it's currently running.
//
// In the example below we use the executor to force shutdown the task
// (timeout equals 0).
if !handle.pluginClient.Exited() {
if err := handle.exec.Shutdown("", 0); err != nil {
handle.logger.Error("destroying executor failed", "err", err)
}
handle.pluginClient.Kill()
}
d.tasks.Delete(taskID)
return nil
}
// InspectTask returns detailed status information for the referenced taskID.
func (d *HelloDriverPlugin) InspectTask(taskID string) (*drivers.TaskStatus, error) {
handle, ok := d.tasks.Get(taskID)
if !ok {
return nil, drivers.ErrTaskNotFound
}
return handle.TaskStatus(), nil
}
// TaskStats returns a channel which the driver should send stats to at the given interval.
func (d *HelloDriverPlugin) TaskStats(ctx context.Context, taskID string, interval time.Duration) (<-chan *drivers.TaskResourceUsage, error) {
handle, ok := d.tasks.Get(taskID)
if !ok {
return nil, drivers.ErrTaskNotFound
}
// TODO: implement driver specific logic to send task stats.
//
// This function returns a channel that Nomad will use to listen for task
// stats (e.g., CPU and memory usage) in a given interval. It should send
// stats until the context is canceled or the task stops running.
//
// In the example below we use the Stats function provided by the executor,
// but you can build a set of functions similar to the fingerprint process.
return handle.exec.Stats(ctx, interval)
}
// TaskEvents returns a channel that the plugin can use to emit task related events.
func (d *HelloDriverPlugin) TaskEvents(ctx context.Context) (<-chan *drivers.TaskEvent, error) {
return d.eventer.TaskEvents(ctx)
}
// SignalTask forwards a signal to a task.
// This is an optional capability.
func (d *HelloDriverPlugin) SignalTask(taskID string, signal string) error {
handle, ok := d.tasks.Get(taskID)
if !ok {
return drivers.ErrTaskNotFound
}
// TODO: implement driver specific signal handling logic.
//
// The given signal must be forwarded to the target taskID. If this plugin
// doesn't support receiving signals (capability SendSignals is set to
// false) you can just return nil.
sig := os.Interrupt
if s, ok := signals.SignalLookup[signal]; ok {
sig = s
} else {
d.logger.Warn("unknown signal to send to task, using SIGINT instead", "signal", signal, "task_id", handle.taskConfig.ID)
}
return handle.exec.Signal(sig)
}
// ExecTask returns the result of executing the given command inside a task.
// This is an optional capability.
func (d *HelloDriverPlugin) ExecTask(taskID string, cmd []string, timeout time.Duration) (*drivers.ExecTaskResult, error) {
// TODO: implement driver specific logic to execute commands in a task.
return nil, fmt.Errorf("This driver does not support exec")
}

51
pkg/plugin/handle.go → hello/handle.go
View file

@ -1,4 +1,4 @@
package skeleton
package hello
import (
"context"
@ -7,6 +7,8 @@ import (
"time"
"github.com/hashicorp/go-hclog"
"github.com/hashicorp/go-plugin"
"github.com/hashicorp/nomad/drivers/shared/executor"
"github.com/hashicorp/nomad/plugins/drivers"
)
@ -14,17 +16,20 @@ import (
// such as process ID if this is a local task or other meta
// data if this driver deals with external APIs
type taskHandle struct {
pid int
logger hclog.Logger
// stateLock syncs access to all fields below
stateLock sync.RWMutex
taskConfig *drivers.TaskConfig
procState drivers.TaskState
startedAt time.Time
completedAt time.Time
exitResult *drivers.ExitResult
logger hclog.Logger
exec executor.Executor
pluginClient *plugin.Client
taskConfig *drivers.TaskConfig
procState drivers.TaskState
startedAt time.Time
completedAt time.Time
exitResult *drivers.ExitResult
// TODO: add any extra relevant information about the task.
pid int
}
func (h *taskHandle) TaskStatus() *drivers.TaskStatus {
@ -57,23 +62,19 @@ func (h *taskHandle) run() {
}
h.stateLock.Unlock()
// TODO: wait for your task to complete and upate its state.
ps, err := h.exec.Wait(context.Background())
h.stateLock.Lock()
defer h.stateLock.Unlock()
// Implement running the task here, this is driver specific
}
func (h *taskHandle) stats(ctx context.Context, interval time.Duration) (<-chan *drivers.TaskResourceUsage, error) {
ch := make(chan *drivers.TaskResourceUsage)
return ch, nil
}
// shutdown shuts down the container, with `timeout` grace period
// before killing the container with SIGKILL.
func (h *taskHandle) shutdown(timeout time.Duration) error {
// Implement shutdown of the task. Shutdown should be tried
// gracefully first. If its past the timeout, then this method
// should do a hard shutdown and return
return nil
if err != nil {
h.exitResult.Err = err
h.procState = drivers.TaskStateUnknown
h.completedAt = time.Now()
return
}
h.procState = drivers.TaskStateExited
h.exitResult.ExitCode = ps.ExitCode
h.exitResult.Signal = ps.Signal
h.completedAt = ps.Time
}

2
pkg/plugin/state.go → hello/state.go
View file

@ -1,4 +1,4 @@
package skeleton
package hello
import (
"sync"

7
cmd/driver/main.go → main.go
View file

@ -1,12 +1,10 @@
// +build linux
package main
import (
log "github.com/hashicorp/go-hclog"
"github.com/hashicorp/nomad-runtime-driver-skeleton/hello"
"github.com/hashicorp/nomad/plugins"
"github.com/hashicorp/nomad-driver-skeleton/pkg/plugin"
)
func main() {
@ -16,6 +14,5 @@ func main() {
// factory returns a new instance of a nomad driver plugin
func factory(log log.Logger) interface{} {
return skeleton.NewSkeletonDriver(log)
return hello.NewPlugin(log)
}

330
pkg/plugin/driver.go
View file

@ -1,330 +0,0 @@
package skeleton
import (
"context"
"fmt"
"time"
hclog "github.com/hashicorp/go-hclog"
"github.com/hashicorp/nomad/drivers/shared/eventer"
"github.com/hashicorp/nomad/plugins/base"
"github.com/hashicorp/nomad/plugins/drivers"
"github.com/hashicorp/nomad/plugins/shared/hclspec"
structs "github.com/hashicorp/nomad/plugins/shared/structs"
)
const (
// pluginName is the name of the plugin
pluginName = "test-plugin"
// fingerprintPeriod is the interval at which the driver will send fingerprint responses
fingerprintPeriod = 30 * time.Second
// taskHandleVersion is the version of task handle which this driver sets
// and understands how to decode driver state
taskHandleVersion = 1
)
var (
// pluginInfo is the response returned for the PluginInfo RPC
pluginInfo = &base.PluginInfoResponse{
Type: base.PluginTypeDriver,
PluginApiVersions: []string{"0.1.0"},
PluginVersion: "0.0.1",
Name: pluginName,
}
// configSpec is the hcl specification returned by the ConfigSchema RPC
configSpec = hclspec.NewObject(map[string]*hclspec.Spec{
"enabled": hclspec.NewDefault(
hclspec.NewAttr("enabled", "bool", false),
hclspec.NewLiteral("true"),
),
})
// taskConfigSpec is the hcl specification for the driver config section of
// a taskConfig within a job. It is returned in the TaskConfigSchema RPC
taskConfigSpec = hclspec.NewObject(map[string]*hclspec.Spec{
"strconfig": hclspec.NewAttr("strconfig", "string", true),
"boolcfg": hclspec.NewAttr("boolcfg", "bool", false),
})
// capabilities is returned by the Capabilities RPC and indicates what
// optional features this driver supports. This should be set according
// to the target run time
capabilities = &drivers.Capabilities{
SendSignals: true,
Exec: false,
}
)
// Driver is a skeleton driver implementation. The fields in this struct
// are to help plugin authors get started writing their runtime plugins.
type Driver struct {
// eventer is used to handle multiplexing of TaskEvents calls such that an
// event can be broadcast to all callers
eventer *eventer.Eventer
// config is the driver configuration set by the SetConfig RPC
config *Config
// nomadConfig is the client config from nomad
nomadConfig *base.ClientDriverConfig
// tasks is the in memory datastore mapping taskIDs to rawExecDriverHandles
tasks *taskStore
// ctx is the context for the driver. It is passed to other subsystems to
// coordinate shutdown
ctx context.Context
// signalShutdown is called when the driver is shutting down and cancels the
// ctx passed to any subsystems
signalShutdown context.CancelFunc
// logger will log to the Nomad agent
logger hclog.Logger
}
// Config is the driver configuration set by the SetConfig RPC call
type Config struct {
// Enabled is set to true to enable this driver
Enabled bool `codec:"enabled"`
}
// TaskConfig is the driver configuration of a task within a job
type TaskConfig struct {
StrConfig string `codec:"strconfig"`
BoolConfig bool `codec:"boolconfig"`
}
// TaskState is the state which is encoded in the handle returned in
// StartTask. This information is needed to rebuild the task state and handler
// during recovery.
type TaskState struct {
TaskConfig *drivers.TaskConfig
ContainerName string
StartedAt time.Time
PID int
}
// NewSkeletonDriver returns a new DriverPlugin implementation
func NewSkeletonDriver(logger hclog.Logger) drivers.DriverPlugin {
ctx, cancel := context.WithCancel(context.Background())
logger = logger.Named(pluginName)
return &Driver{
eventer: eventer.NewEventer(ctx, logger),
config: &Config{},
tasks: newTaskStore(),
ctx: ctx,
signalShutdown: cancel,
logger: logger,
}
}
func (d *Driver) PluginInfo() (*base.PluginInfoResponse, error) {
return pluginInfo, nil
}
func (d *Driver) ConfigSchema() (*hclspec.Spec, error) {
return configSpec, nil
}
func (d *Driver) SetConfig(cfg *base.Config) error {
var config Config
if len(cfg.PluginConfig) != 0 {
if err := base.MsgPackDecode(cfg.PluginConfig, &config); err != nil {
return err
}
}
d.config = &config
if cfg.AgentConfig != nil {
d.nomadConfig = cfg.AgentConfig.Driver
}
return nil
}
func (d *Driver) Shutdown(ctx context.Context) error {
d.signalShutdown()
return nil
}
func (d *Driver) TaskConfigSchema() (*hclspec.Spec, error) {
return taskConfigSpec, nil
}
func (d *Driver) Capabilities() (*drivers.Capabilities, error) {
return capabilities, nil
}
func (d *Driver) Fingerprint(ctx context.Context) (<-chan *drivers.Fingerprint, error) {
ch := make(chan *drivers.Fingerprint)
go d.handleFingerprint(ctx, ch)
return ch, nil
}
func (d *Driver) handleFingerprint(ctx context.Context, ch chan<- *drivers.Fingerprint) {
defer close(ch)
ticker := time.NewTimer(0)
for {
select {
case <-ctx.Done():
return
case <-d.ctx.Done():
return
case <-ticker.C:
ticker.Reset(fingerprintPeriod)
ch <- d.buildFingerprint()
}
}
}
func (d *Driver) buildFingerprint() *drivers.Fingerprint {
var health drivers.HealthState
var desc string
attrs := map[string]*structs.Attribute{}
// Implement finger printing logic here to populate health and driver attributes
return &drivers.Fingerprint{
Attributes: attrs,
Health: health,
HealthDescription: desc,
}
}
func (d *Driver) RecoverTask(handle *drivers.TaskHandle) error {
if handle == nil {
return fmt.Errorf("error: handle cannot be nil")
}
if _, ok := d.tasks.Get(handle.Config.ID); ok {
return nil
}
var taskState TaskState
if err := handle.GetDriverState(&taskState); err != nil {
return fmt.Errorf("failed to decode task state from handle: %v", err)
}
var driverConfig TaskConfig
if err := taskState.TaskConfig.DecodeDriverConfig(&driverConfig); err != nil {
return fmt.Errorf("failed to decode driver config: %v", err)
}
// Implement driver specific way to reattach to a running task or restart
return nil
}
// StartTask setup the task exec and calls the container excecutor
func (d *Driver) StartTask(cfg *drivers.TaskConfig) (*drivers.TaskHandle, *drivers.DriverNetwork, error) {
if _, ok := d.tasks.Get(cfg.ID); ok {
return nil, nil, fmt.Errorf("task with ID %q already started", cfg.ID)
}
var driverConfig TaskConfig
if err := cfg.DecodeDriverConfig(&driverConfig); err != nil {
return nil, nil, fmt.Errorf("failed to decode driver config: %v", err)
}
handle := drivers.NewTaskHandle(taskHandleVersion)
handle.Config = cfg
// Implement driver specific mechanism to start the task here
return nil, nil, nil
}
func (d *Driver) WaitTask(ctx context.Context, taskID string) (<-chan *drivers.ExitResult, error) {
handle, ok := d.tasks.Get(taskID)
if !ok {
return nil, drivers.ErrTaskNotFound
}
ch := make(chan *drivers.ExitResult)
go d.handleWait(ctx, handle, ch)
return ch, nil
}
func (d *Driver) handleWait(ctx context.Context, handle *taskHandle, ch chan *drivers.ExitResult) {
defer close(ch)
ticker := time.NewTicker(1 * time.Second)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return
case <-d.ctx.Done():
return
case <-ticker.C:
s := handle.TaskStatus()
if s.State == drivers.TaskStateExited {
ch <- handle.exitResult
}
}
}
}
func (d *Driver) StopTask(taskID string, timeout time.Duration, signal string) error {
handle, ok := d.tasks.Get(taskID)
if !ok {
return drivers.ErrTaskNotFound
}
if err := handle.shutdown(timeout); err != nil {
return fmt.Errorf("executor Shutdown failed: %v", err)
}
return nil
}
func (d *Driver) DestroyTask(taskID string, force bool) error {
handle, ok := d.tasks.Get(taskID)
if !ok {
return drivers.ErrTaskNotFound
}
if handle.IsRunning() && !force {
return fmt.Errorf("cannot destroy running task")
}
d.tasks.Delete(taskID)
return nil
}
func (d *Driver) InspectTask(taskID string) (*drivers.TaskStatus, error) {
handle, ok := d.tasks.Get(taskID)
if !ok {
return nil, drivers.ErrTaskNotFound
}
return handle.TaskStatus(), nil
}
func (d *Driver) TaskStats(ctx context.Context, taskID string, interval time.Duration) (<-chan *drivers.TaskResourceUsage, error) {
handle, ok := d.tasks.Get(taskID)
if !ok {
return nil, drivers.ErrTaskNotFound
}
return handle.stats(ctx, interval)
}
func (d *Driver) TaskEvents(ctx context.Context) (<-chan *drivers.TaskEvent, error) {
return d.eventer.TaskEvents(ctx)
}
func (d *Driver) SignalTask(taskID string, signal string) error {
return fmt.Errorf("This driver does not support signals")
}
func (d *Driver) ExecTask(taskID string, cmd []string, timeout time.Duration) (*drivers.ExecTaskResult, error) {
return nil, fmt.Errorf("This driver does not support exec") //TODO
}