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koushin: add Store interface

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References: https://todo.sr.ht/~sircmpwn/koushin/5
This commit is contained in:
Simon Ser 2020-01-28 20:04:18 +01:00
parent c0b4998b38
commit bdf1a8b02b
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GPG key ID: 0FDE7BE0E88F5E48
5 changed files with 161 additions and 3 deletions
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1
go.mod
View file

@ -6,6 +6,7 @@ require (
github.com/aymerick/douceur v0.2.0
github.com/chris-ramon/douceur v0.2.0
github.com/emersion/go-imap v1.0.3
github.com/emersion/go-imap-metadata v0.0.0-20200128185110-9d939d2a0915
github.com/emersion/go-imap-move v0.0.0-20190710073258-6e5a51a5b342
github.com/emersion/go-imap-specialuse v0.0.0-20161227184202-ba031ced6a62
github.com/emersion/go-message v0.11.1

2
go.sum
View file

@ -12,6 +12,8 @@ github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumC
github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
github.com/emersion/go-imap v1.0.3 h1:5eEee8/DTSIPfliiWqwfvjPGkU8bBtvOy/Wx+eeXzO4=
github.com/emersion/go-imap v1.0.3/go.mod h1:yKASt+C3ZiDAiCSssxg9caIckWF/JG7ZQTO7GAmvicU=
github.com/emersion/go-imap-metadata v0.0.0-20200128185110-9d939d2a0915 h1:8xzODjLqrfAJo+CNhX0Fp47vdVN0ZvmGV3CPt/Ex1nU=
github.com/emersion/go-imap-metadata v0.0.0-20200128185110-9d939d2a0915/go.mod h1:6mXMzbK9Ts0mrrBibqy56SqZpuFMry5AedTgu6qY5zM=
github.com/emersion/go-imap-move v0.0.0-20190710073258-6e5a51a5b342 h1:5p1t3e1PomYgLWwEwhwEU5kVBwcyAcVrOpexv8AeZx0=
github.com/emersion/go-imap-move v0.0.0-20190710073258-6e5a51a5b342/go.mod h1:QuMaZcKFDVI0yCrnAbPLfbwllz1wtOrZH8/vZ5yzp4w=
github.com/emersion/go-imap-specialuse v0.0.0-20161227184202-ba031ced6a62 h1:4ZAfwfc8aDlj26kkEap1UDSwwDnJp9Ie8Uj1MSXAkPk=

2
server.go
View file

@ -59,7 +59,7 @@ func newServer(e *echo.Echo, options *Options) (*Server, error) {
return nil, err
}
s.Sessions = newSessionManager(s.dialIMAP, s.dialSMTP)
s.Sessions = newSessionManager(s.dialIMAP, s.dialSMTP, e.Logger)
return s, nil
}

18
session.go
View file

@ -12,6 +12,7 @@ import (
imapclient "github.com/emersion/go-imap/client"
"github.com/emersion/go-sasl"
"github.com/emersion/go-smtp"
"github.com/labstack/echo/v4"
)
// TODO: make this configurable
@ -48,6 +49,7 @@ type Session struct {
closed chan struct{}
pings chan struct{}
timer *time.Timer
store Store
imapLocker sync.Mutex
imapConn *imapclient.Client // protected by locker, can be nil
@ -122,6 +124,11 @@ func (s *Session) Close() {
}
}
// Store returns a store suitable for storing persistent user data.
func (s *Session) Store() Store {
return s.store
}
type (
// DialIMAPFunc connects to the upstream IMAP server.
DialIMAPFunc func() (*imapclient.Client, error)
@ -134,16 +141,18 @@ type (
type SessionManager struct {
dialIMAP DialIMAPFunc
dialSMTP DialSMTPFunc
logger echo.Logger
locker sync.Mutex
sessions map[string]*Session // protected by locker
}
func newSessionManager(dialIMAP DialIMAPFunc, dialSMTP DialSMTPFunc) *SessionManager {
func newSessionManager(dialIMAP DialIMAPFunc, dialSMTP DialSMTPFunc, logger echo.Logger) *SessionManager {
return &SessionManager{
sessions: make(map[string]*Session),
dialIMAP: dialIMAP,
dialSMTP: dialSMTP,
logger: logger,
}
}
@ -185,7 +194,6 @@ func (sm *SessionManager) Put(username, password string) (*Session, error) {
var token string
for {
var err error
token, err = generateToken()
if err != nil {
c.Logout()
@ -206,6 +214,12 @@ func (sm *SessionManager) Put(username, password string) (*Session, error) {
password: password,
token: token,
}
s.store, err = newStore(s, sm.logger)
if err != nil {
return nil, err
}
sm.sessions[token] = s
go func() {

141
store.go Normal file
View file

@ -0,0 +1,141 @@
package koushin
import (
"encoding/json"
"fmt"
"reflect"
"sync"
imapmetadata "github.com/emersion/go-imap-metadata"
imapclient "github.com/emersion/go-imap/client"
"github.com/labstack/echo/v4"
)
// ErrNoStoreEntry is returned by Store.Get when the entry doesn't exist.
var ErrNoStoreEntry = fmt.Errorf("koushin: no such entry in store")
// Store allows storing per-user persistent data.
//
// Store shouldn't be used from inside Session.DoIMAP.
type Store interface {
Get(key string, out interface{}) error
Put(key string, v interface{}) error
}
var warnedTransientStore = false
func newStore(session *Session, logger echo.Logger) (Store, error) {
s, err := newIMAPStore(session)
if err == nil {
return s, nil
} else if err != errIMAPMetadataUnsupported {
return nil, err
}
if !warnedTransientStore {
logger.Print("Upstream IMAP server doesn't support the METADATA extension, using transient store instead")
warnedTransientStore = true
}
return newMemoryStore(), nil
}
type memoryStore struct {
locker sync.RWMutex
entries map[string]interface{}
}
func newMemoryStore() *memoryStore {
return &memoryStore{entries: make(map[string]interface{})}
}
func (s *memoryStore) Get(key string, out interface{}) error {
s.locker.RLock()
defer s.locker.RUnlock()
v, ok := s.entries[key]
if !ok {
return ErrNoStoreEntry
}
reflect.ValueOf(out).Elem().Set(reflect.ValueOf(v).Elem())
return nil
}
func (s *memoryStore) Put(key string, v interface{}) error {
s.locker.Lock()
s.entries[key] = v
s.locker.Unlock()
return nil
}
type imapStore struct {
session *Session
cache *memoryStore
}
var errIMAPMetadataUnsupported = fmt.Errorf("koushin: IMAP server doesn't support METADATA extension")
func newIMAPStore(session *Session) (*imapStore, error) {
err := session.DoIMAP(func(c *imapclient.Client) error {
mc := imapmetadata.NewClient(c)
ok, err := mc.SupportMetadata()
if err != nil {
return fmt.Errorf("koushin: failed to check for IMAP METADATA support: %v", err)
}
if !ok {
return errIMAPMetadataUnsupported
}
return nil
})
if err != nil {
return nil, err
}
return &imapStore{session, newMemoryStore()}, nil
}
func (s *imapStore) key(key string) string {
return "/private/vendor/koushin/" + key
}
func (s *imapStore) Get(key string, out interface{}) error {
if err := s.cache.Get(key, out); err != ErrNoStoreEntry {
return err
}
var entries map[string]string
err := s.session.DoIMAP(func(c *imapclient.Client) error {
mc := imapmetadata.NewClient(c)
var err error
entries, err = mc.GetMetadata("", []string{s.key(key)}, nil)
return err
})
if err != nil {
return fmt.Errorf("koushin: failed to fetch IMAP store entry %q: %v", key, err)
}
v, ok := entries[s.key(key)]
if !ok {
return ErrNoStoreEntry
}
if err := json.Unmarshal([]byte(v), out); err != nil {
return fmt.Errorf("koushin: failed to unmarshal IMAP store entry %q: %v", key, err)
}
return s.cache.Put(key, out)
}
func (s *imapStore) Put(key string, v interface{}) error {
b, err := json.Marshal(v)
if err != nil {
return fmt.Errorf("koushin: failed to marshal IMAP store entry %q: %v", key, err)
}
entries := map[string]string{
s.key(key): string(b),
}
err = s.session.DoIMAP(func(c *imapclient.Client) error {
mc := imapmetadata.NewClient(c)
return mc.SetMetadata("", entries)
})
if err != nil {
return fmt.Errorf("koushin: failed to put IMAP store entry %q: %v", key, err)
}
return s.cache.Put(key, v)
}