garage/src/k2v-client/lib.rs

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use std::collections::BTreeMap;
use std::convert::TryInto;
use std::time::{Duration, SystemTime};
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use base64::prelude::*;
use log::{debug, error};
use percent_encoding::{utf8_percent_encode, AsciiSet, NON_ALPHANUMERIC};
use http::header::{ACCEPT, CONTENT_TYPE};
use http::status::StatusCode;
use http::{HeaderName, HeaderValue, Request};
use http_body_util::{BodyExt, Full as FullBody};
use hyper::body::Bytes;
use hyper_rustls::HttpsConnector;
use hyper_util::client::legacy::{connect::HttpConnector, Client as HttpClient};
use hyper_util::rt::TokioExecutor;
use aws_sdk_config::config::Credentials;
use aws_sigv4::http_request::{sign, SignableBody, SignableRequest, SigningSettings};
use aws_sigv4::sign::v4::SigningParams;
use serde::de::Error as DeError;
use serde::{Deserialize, Deserializer, Serialize, Serializer};
mod error;
pub use error::Error;
pub type Body = FullBody<Bytes>;
const DEFAULT_TIMEOUT: Duration = Duration::from_secs(5);
const DEFAULT_POLL_TIMEOUT: Duration = Duration::from_secs(300);
const SERVICE: &str = "k2v";
const AMZ_CONTENT_SHA256: HeaderName = HeaderName::from_static("x-amz-content-sha256");
const GARAGE_CAUSALITY_TOKEN: HeaderName = HeaderName::from_static("x-garage-causality-token");
const STRICT_ENCODE_SET: AsciiSet = NON_ALPHANUMERIC
.remove(b'_')
.remove(b'-')
.remove(b'.')
.remove(b'~');
const PATH_ENCODE_SET: AsciiSet = NON_ALPHANUMERIC
.remove(b'/')
.remove(b'_')
.remove(b'-')
.remove(b'.')
.remove(b'~');
pub struct K2vClientConfig {
pub endpoint: String,
pub region: String,
pub aws_access_key_id: String,
pub aws_secret_access_key: String,
pub bucket: String,
pub user_agent: Option<String>,
}
/// Client used to query a K2V server.
pub struct K2vClient {
config: K2vClientConfig,
user_agent: HeaderValue,
client: HttpClient<HttpsConnector<HttpConnector>, Body>,
}
impl K2vClient {
/// Create a new K2V client.
pub fn new(config: K2vClientConfig) -> Result<Self, Error> {
let connector = hyper_rustls::HttpsConnectorBuilder::new()
.with_native_roots()?
.https_or_http()
.enable_http1()
.enable_http2()
.build();
let client = HttpClient::builder(TokioExecutor::new()).build(connector);
let user_agent: std::borrow::Cow<str> = match &config.user_agent {
Some(ua) => ua.into(),
None => format!("k2v/{}", env!("CARGO_PKG_VERSION")).into(),
};
let user_agent = HeaderValue::from_str(&user_agent)
.map_err(|_| Error::Message("invalid user agent".into()))?;
Ok(K2vClient {
config,
client,
user_agent,
})
}
/// Perform a ReadItem request, reading the value(s) stored for a single pk+sk.
pub async fn read_item(
&self,
partition_key: &str,
sort_key: &str,
) -> Result<CausalValue, Error> {
let url = self.build_url(Some(partition_key), &[("sort_key", sort_key)]);
let req = Request::get(url)
.header(ACCEPT, "application/octet-stream, application/json")
.body(Bytes::new())?;
let res = self.dispatch(req, None).await?;
let causality = res
.causality_token
.ok_or_else(|| Error::InvalidResponse("missing causality token".into()))?;
if res.status == StatusCode::NO_CONTENT {
return Ok(CausalValue {
causality,
value: vec![K2vValue::Tombstone],
});
}
match res.content_type.as_deref() {
Some("application/octet-stream") => Ok(CausalValue {
causality,
value: vec![K2vValue::Value(res.body.to_vec())],
}),
Some("application/json") => {
let value = serde_json::from_slice(&res.body)?;
Ok(CausalValue { causality, value })
}
Some(ct) => Err(Error::InvalidResponse(
format!("invalid content type: {}", ct).into(),
)),
None => Err(Error::InvalidResponse("missing content type".into())),
}
}
/// Perform a PollItem request, waiting for the value(s) stored for a single pk+sk to be
/// updated.
pub async fn poll_item(
&self,
partition_key: &str,
sort_key: &str,
causality: CausalityToken,
timeout: Option<Duration>,
) -> Result<Option<CausalValue>, Error> {
let timeout = timeout.unwrap_or(DEFAULT_POLL_TIMEOUT);
let url = self.build_url(
Some(partition_key),
&[
("sort_key", sort_key),
("causality_token", &causality.0),
("timeout", &timeout.as_secs().to_string()),
],
);
let req = Request::get(url)
.header(ACCEPT, "application/octet-stream, application/json")
.body(Bytes::new())?;
let res = self.dispatch(req, Some(timeout + DEFAULT_TIMEOUT)).await?;
if res.status == StatusCode::NOT_MODIFIED {
return Ok(None);
}
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let causality = res
.causality_token
.ok_or_else(|| Error::InvalidResponse("missing causality token".into()))?;
if res.status == StatusCode::NO_CONTENT {
return Ok(Some(CausalValue {
causality,
value: vec![K2vValue::Tombstone],
}));
}
match res.content_type.as_deref() {
Some("application/octet-stream") => Ok(Some(CausalValue {
causality,
value: vec![K2vValue::Value(res.body.to_vec())],
})),
Some("application/json") => {
let value = serde_json::from_slice(&res.body)?;
Ok(Some(CausalValue { causality, value }))
}
Some(ct) => Err(Error::InvalidResponse(
format!("invalid content type: {}", ct).into(),
)),
None => Err(Error::InvalidResponse("missing content type".into())),
}
}
/// Perform a PollRange request, waiting for any change in a given range of keys
/// to occur
pub async fn poll_range(
&self,
partition_key: &str,
filter: Option<PollRangeFilter<'_>>,
seen_marker: Option<&str>,
timeout: Option<Duration>,
) -> Result<Option<PollRangeResult>, Error> {
let timeout = timeout.unwrap_or(DEFAULT_POLL_TIMEOUT);
let request = PollRangeRequest {
filter: filter.unwrap_or_default(),
seen_marker,
timeout: timeout.as_secs(),
};
let url = self.build_url(Some(partition_key), &[("poll_range", "")]);
let payload = serde_json::to_vec(&request)?;
let req = Request::post(url).body(Bytes::from(payload))?;
let res = self.dispatch(req, Some(timeout + DEFAULT_TIMEOUT)).await?;
if res.status == StatusCode::NOT_MODIFIED {
return Ok(None);
}
let resp: PollRangeResponse = serde_json::from_slice(&res.body)?;
let items = resp
.items
.into_iter()
.map(|BatchReadItem { sk, ct, v }| {
(
sk,
CausalValue {
causality: ct,
value: v,
},
)
})
.collect::<BTreeMap<_, _>>();
Ok(Some(PollRangeResult {
items,
seen_marker: resp.seen_marker,
}))
}
/// Perform an InsertItem request, inserting a value for a single pk+sk.
pub async fn insert_item(
&self,
partition_key: &str,
sort_key: &str,
value: Vec<u8>,
causality: Option<CausalityToken>,
) -> Result<(), Error> {
let url = self.build_url(Some(partition_key), &[("sort_key", sort_key)]);
let mut req = Request::put(url);
if let Some(causality) = causality {
req = req.header(GARAGE_CAUSALITY_TOKEN, &causality.0);
}
let req = req.body(Bytes::from(value))?;
self.dispatch(req, None).await?;
Ok(())
}
/// Perform a DeleteItem request, deleting the value(s) stored for a single pk+sk.
pub async fn delete_item(
&self,
partition_key: &str,
sort_key: &str,
causality: CausalityToken,
) -> Result<(), Error> {
let url = self.build_url(Some(partition_key), &[("sort_key", sort_key)]);
let req = Request::delete(url)
.header(GARAGE_CAUSALITY_TOKEN, &causality.0)
.body(Bytes::new())?;
self.dispatch(req, None).await?;
Ok(())
}
/// Perform a ReadIndex request, listing partition key which have at least one associated
/// sort key, and which matches the filter.
pub async fn read_index(
&self,
filter: Filter<'_>,
) -> Result<PaginatedRange<PartitionInfo>, Error> {
let params = filter.query_params();
let url = self.build_url(None, &params);
let req = Request::get(url).body(Bytes::new())?;
let res = self.dispatch(req, None).await?;
let resp: ReadIndexResponse = serde_json::from_slice(&res.body)?;
let items = resp
.partition_keys
.into_iter()
.map(|ReadIndexItem { pk, info }| (pk, info))
.collect();
Ok(PaginatedRange {
items,
next_start: resp.next_start,
})
}
/// Perform an InsertBatch request, inserting multiple values at once. Note: this operation is
/// *not* atomic: it is possible for some sub-operations to fails and others to success. In
/// that case, failure is reported.
pub async fn insert_batch(&self, operations: &[BatchInsertOp<'_>]) -> Result<(), Error> {
let url = self.build_url::<&str>(None, &[]);
let payload = serde_json::to_vec(operations)?;
let req = Request::post(url).body(payload.into())?;
self.dispatch(req, None).await?;
Ok(())
}
/// Perform a ReadBatch request, reading multiple values or range of values at once.
pub async fn read_batch(
&self,
operations: &[BatchReadOp<'_>],
) -> Result<Vec<PaginatedRange<CausalValue>>, Error> {
let url = self.build_url(None, &[("search", "")]);
let payload = serde_json::to_vec(operations)?;
let req = Request::post(url).body(payload.into())?;
let res = self.dispatch(req, None).await?;
let resp: Vec<BatchReadResponse> = serde_json::from_slice(&res.body)?;
Ok(resp
.into_iter()
.map(|e| PaginatedRange {
items: e
.items
.into_iter()
.map(|BatchReadItem { sk, ct, v }| {
(
sk,
CausalValue {
causality: ct,
value: v,
},
)
})
.collect(),
next_start: e.next_start,
})
.collect())
}
/// Perform a DeleteBatch request, deleting mutiple values or range of values at once, without
/// providing causality information.
pub async fn delete_batch(&self, operations: &[BatchDeleteOp<'_>]) -> Result<Vec<u64>, Error> {
let url = self.build_url(None, &[("delete", "")]);
let payload = serde_json::to_vec(operations)?;
let req = Request::post(url).body(payload.into())?;
let res = self.dispatch(req, None).await?;
let resp: Vec<BatchDeleteResponse> = serde_json::from_slice(&res.body)?;
Ok(resp.into_iter().map(|r| r.deleted_items).collect())
}
async fn dispatch(
&self,
mut req: Request<Bytes>,
timeout: Option<Duration>,
) -> Result<Response, Error> {
req.headers_mut()
.insert(http::header::USER_AGENT, self.user_agent.clone());
use sha2::{Digest, Sha256};
let mut hasher = Sha256::new();
hasher.update(req.body());
let hash = hex::encode(&hasher.finalize());
req.headers_mut()
.insert(AMZ_CONTENT_SHA256, hash.try_into().unwrap());
debug!("request uri: {:?}", req.uri());
// Sign request
let signing_settings = SigningSettings::default();
let identity = Credentials::new(
&self.config.aws_access_key_id,
&self.config.aws_secret_access_key,
None,
None,
"k2v-client",
)
.into();
let signing_params = SigningParams::builder()
.identity(&identity)
.region(&self.config.region)
.name(SERVICE)
.time(SystemTime::now())
.settings(signing_settings)
.build()?
.into();
// Convert the HTTP request into a signable request
let signable_request = SignableRequest::new(
req.method().as_str(),
req.uri().to_string(),
// TODO: get rid of Unwrap
req.headers()
.iter()
.map(|(x, y)| (x.as_str(), y.to_str().unwrap())),
SignableBody::Bytes(req.body().as_ref()),
)?;
// Sign and then apply the signature to the request
let (signing_instructions, _signature) =
sign(signable_request, &signing_params)?.into_parts();
signing_instructions.apply_to_request_http1x(&mut req);
// Send and wait for timeout
let res = tokio::select! {
res = self.client.request(req.map(Body::from)) => res?,
_ = tokio::time::sleep(timeout.unwrap_or(DEFAULT_TIMEOUT)) => {
return Err(Error::Timeout);
}
};
let (mut res, body) = res.into_parts();
let causality_token = match res.headers.remove(GARAGE_CAUSALITY_TOKEN) {
Some(v) => Some(CausalityToken(v.to_str()?.to_string())),
None => None,
};
let content_type = match res.headers.remove(CONTENT_TYPE) {
Some(v) => Some(v.to_str()?.to_string()),
None => None,
};
let body = match res.status {
StatusCode::OK => BodyExt::collect(body).await?.to_bytes(),
StatusCode::NO_CONTENT => Bytes::new(),
StatusCode::NOT_FOUND => return Err(Error::NotFound),
StatusCode::NOT_MODIFIED => Bytes::new(),
s => {
let err_body = body
.collect()
.await
.map(|x| x.to_bytes())
.unwrap_or_default();
let err_body_str = std::str::from_utf8(&err_body)
.map(String::from)
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.unwrap_or_else(|_| BASE64_STANDARD.encode(&err_body));
if s.is_client_error() || s.is_server_error() {
error!("Error response {}: {}", res.status, err_body_str);
let err = match serde_json::from_slice::<ErrorResponse>(&err_body) {
Ok(err) => Error::Remote(
res.status,
err.code.into(),
err.message.into(),
err.path.into(),
),
Err(_) => Error::Remote(
res.status,
"unknown".into(),
err_body_str.into(),
"?".into(),
),
};
return Err(err);
} else {
let msg = format!(
"Unexpected response code {}. Response body: {}",
res.status, err_body_str
);
error!("{}", msg);
return Err(Error::InvalidResponse(msg.into()));
}
}
};
debug!(
"Response body: {}",
std::str::from_utf8(&body)
.map(String::from)
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.unwrap_or_else(|_| BASE64_STANDARD.encode(&body))
);
Ok(Response {
body,
status: res.status,
causality_token,
content_type,
})
}
fn build_url<V: AsRef<str>>(&self, partition_key: Option<&str>, query: &[(&str, V)]) -> String {
let mut url = format!(
"{}/{}",
self.config.endpoint.trim_end_matches('/'),
self.config.bucket
);
if let Some(pk) = partition_key {
url.push('/');
url.extend(utf8_percent_encode(pk, &PATH_ENCODE_SET));
}
if !query.is_empty() {
url.push('?');
for (i, (k, v)) in query.iter().enumerate() {
if i > 0 {
url.push('&');
}
url.extend(utf8_percent_encode(k, &STRICT_ENCODE_SET));
url.push('=');
url.extend(utf8_percent_encode(v.as_ref(), &STRICT_ENCODE_SET));
}
}
url
}
}
/// An opaque token used to convey causality between operations.
#[derive(Debug, Clone, PartialEq, Eq, Deserialize, Serialize)]
#[serde(transparent)]
pub struct CausalityToken(String);
impl From<String> for CausalityToken {
fn from(v: String) -> Self {
CausalityToken(v)
}
}
impl From<CausalityToken> for String {
fn from(v: CausalityToken) -> Self {
v.0
}
}
impl AsRef<str> for CausalityToken {
fn as_ref(&self) -> &str {
&self.0
}
}
/// A value in K2V. can be either a binary value, or a tombstone.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum K2vValue {
Tombstone,
Value(Vec<u8>),
}
impl From<Vec<u8>> for K2vValue {
fn from(v: Vec<u8>) -> Self {
K2vValue::Value(v)
}
}
impl From<Option<Vec<u8>>> for K2vValue {
fn from(v: Option<Vec<u8>>) -> Self {
match v {
Some(v) => K2vValue::Value(v),
None => K2vValue::Tombstone,
}
}
}
impl<'de> Deserialize<'de> for K2vValue {
fn deserialize<D>(d: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
let val: Option<&str> = Option::deserialize(d)?;
Ok(match val {
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Some(s) => K2vValue::Value(
BASE64_STANDARD
.decode(s)
.map_err(|_| DeError::custom("invalid base64"))?,
),
None => K2vValue::Tombstone,
})
}
}
impl Serialize for K2vValue {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
match self {
K2vValue::Tombstone => serializer.serialize_none(),
K2vValue::Value(v) => {
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let b64 = BASE64_STANDARD.encode(v);
serializer.serialize_str(&b64)
}
}
}
}
/// A set of K2vValue and associated causality information.
#[derive(Debug, Clone, Serialize)]
pub struct CausalValue {
pub causality: CausalityToken,
pub value: Vec<K2vValue>,
}
/// Result of paginated requests.
#[derive(Debug, Clone)]
pub struct PaginatedRange<V> {
pub items: BTreeMap<String, V>,
pub next_start: Option<String>,
}
/// Filter for batch operations.
#[derive(Debug, Default, Clone, Deserialize, Serialize)]
pub struct Filter<'a> {
pub start: Option<&'a str>,
pub end: Option<&'a str>,
pub prefix: Option<&'a str>,
pub limit: Option<u64>,
#[serde(default)]
pub reverse: bool,
}
/// Filter for a poll range operations.
#[derive(Debug, Default, Clone, Serialize)]
pub struct PollRangeFilter<'a> {
pub start: Option<&'a str>,
pub end: Option<&'a str>,
pub prefix: Option<&'a str>,
}
/// Response to a poll_range query
#[derive(Debug, Default, Clone, Serialize)]
pub struct PollRangeResult {
/// List of items that have changed since last PollRange call.
pub items: BTreeMap<String, CausalValue>,
/// opaque string representing items already seen for future PollRange calls.
pub seen_marker: String,
}
#[derive(Debug, Clone, Serialize)]
#[serde(rename_all = "camelCase")]
struct PollRangeRequest<'a> {
#[serde(flatten)]
filter: PollRangeFilter<'a>,
seen_marker: Option<&'a str>,
timeout: u64,
}
#[derive(Debug, Clone, Deserialize)]
#[serde(rename_all = "camelCase")]
struct PollRangeResponse {
items: Vec<BatchReadItem>,
seen_marker: String,
}
impl<'a> Filter<'a> {
fn query_params(&self) -> Vec<(&'static str, std::borrow::Cow<str>)> {
let mut res = Vec::<(&'static str, std::borrow::Cow<str>)>::with_capacity(8);
if let Some(start) = self.start.as_deref() {
res.push(("start", start.into()));
}
if let Some(end) = self.end.as_deref() {
res.push(("end", end.into()));
}
if let Some(prefix) = self.prefix.as_deref() {
res.push(("prefix", prefix.into()));
}
if let Some(limit) = &self.limit {
res.push(("limit", limit.to_string().into()));
}
if self.reverse {
res.push(("reverse", "true".into()));
}
res
}
}
#[derive(Debug, Clone, Deserialize)]
#[serde(rename_all = "camelCase")]
struct ReadIndexResponse<'a> {
#[serde(flatten, borrow)]
#[allow(dead_code)]
filter: Filter<'a>,
partition_keys: Vec<ReadIndexItem>,
#[allow(dead_code)]
more: bool,
next_start: Option<String>,
}
#[derive(Debug, Clone, Deserialize)]
struct ReadIndexItem {
pk: String,
#[serde(flatten)]
info: PartitionInfo,
}
/// Information about data stored with a given partition key.
#[derive(Debug, Clone, Deserialize, Serialize)]
pub struct PartitionInfo {
pub entries: u64,
pub conflicts: u64,
pub values: u64,
pub bytes: u64,
}
/// Single sub-operation of an InsertBatch.
#[derive(Debug, Clone, Serialize)]
pub struct BatchInsertOp<'a> {
#[serde(rename = "pk")]
pub partition_key: &'a str,
#[serde(rename = "sk")]
pub sort_key: &'a str,
#[serde(rename = "ct")]
pub causality: Option<CausalityToken>,
#[serde(rename = "v")]
pub value: K2vValue,
}
/// Single sub-operation of a ReadBatch.
#[derive(Debug, Default, Clone, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct BatchReadOp<'a> {
pub partition_key: &'a str,
#[serde(flatten, borrow)]
pub filter: Filter<'a>,
#[serde(default)]
pub single_item: bool,
#[serde(default)]
pub conflicts_only: bool,
#[serde(default)]
pub tombstones: bool,
}
#[derive(Debug, Clone, Deserialize)]
#[serde(rename_all = "camelCase")]
struct BatchReadResponse<'a> {
#[serde(flatten, borrow)]
#[allow(dead_code)]
op: BatchReadOp<'a>,
items: Vec<BatchReadItem>,
#[allow(dead_code)]
more: bool,
next_start: Option<String>,
}
#[derive(Debug, Clone, Deserialize)]
struct BatchReadItem {
sk: String,
ct: CausalityToken,
v: Vec<K2vValue>,
}
/// Single sub-operation of a DeleteBatch
#[derive(Debug, Clone, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct BatchDeleteOp<'a> {
pub partition_key: &'a str,
pub prefix: Option<&'a str>,
pub start: Option<&'a str>,
pub end: Option<&'a str>,
#[serde(default)]
pub single_item: bool,
}
impl<'a> BatchDeleteOp<'a> {
pub fn new(partition_key: &'a str) -> Self {
BatchDeleteOp {
partition_key,
prefix: None,
start: None,
end: None,
single_item: false,
}
}
}
#[derive(Debug, Clone, Deserialize)]
#[serde(rename_all = "camelCase")]
struct BatchDeleteResponse<'a> {
#[serde(flatten, borrow)]
#[allow(dead_code)]
filter: BatchDeleteOp<'a>,
deleted_items: u64,
}
#[derive(Deserialize)]
struct ErrorResponse {
code: String,
message: String,
#[allow(dead_code)]
region: String,
path: String,
}
struct Response {
body: Bytes,
status: StatusCode,
causality_token: Option<CausalityToken>,
content_type: Option<String>,
}