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Compress remote storage requests and responses with unframed/raw snappy. (#2696)

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* Compress remote storage requests and responses with unframed/raw snappy, for compatibility with other languages.

* Remove backwards compatibility code from remote_storage_adapter, update example_write_adapter

* Add /documentation/examples/remote_storage/example_write_adapter/example_writer_adapter to .gitignore
This commit is contained in:
Tom Wilkie 2017-05-10 15:42:59 +01:00 committed by Julius Volz
parent 14d0604aba
commit 3141a6b36b
4 changed files with 42 additions and 20 deletions
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2
.gitignore vendored
View file

@ -25,3 +25,5 @@ benchmark.txt
!/circle.yml
!/.travis.yml
!/.promu.yml
/documentation/examples/remote_storage/remote_storage_adapter/remote_storage_adapter
/documentation/examples/remote_storage/example_write_adapter/example_writer_adapter

8
documentation/examples/remote_storage/example_write_adapter/server.go
View file

@ -27,7 +27,13 @@ import (
func main() {
http.HandleFunc("/receive", func(w http.ResponseWriter, r *http.Request) {
reqBuf, err := ioutil.ReadAll(snappy.NewReader(r.Body))
compressed, err := ioutil.ReadAll(r.Body)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
reqBuf, err := snappy.Decode(nil, compressed)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return

21
documentation/examples/remote_storage/remote_storage_adapter/main.go
View file

@ -184,7 +184,13 @@ func buildClients(cfg *config) ([]writer, []reader) {
func serve(addr string, writers []writer, readers []reader) error {
http.HandleFunc("/write", func(w http.ResponseWriter, r *http.Request) {
reqBuf, err := ioutil.ReadAll(snappy.NewReader(r.Body))
compressed, err := ioutil.ReadAll(r.Body)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
reqBuf, err := snappy.Decode(nil, compressed)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
@ -211,7 +217,13 @@ func serve(addr string, writers []writer, readers []reader) error {
})
http.HandleFunc("/read", func(w http.ResponseWriter, r *http.Request) {
reqBuf, err := ioutil.ReadAll(snappy.NewReader(r.Body))
compressed, err := ioutil.ReadAll(r.Body)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
reqBuf, err := snappy.Decode(nil, compressed)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
@ -245,7 +257,10 @@ func serve(addr string, writers []writer, readers []reader) error {
}
w.Header().Set("Content-Type", "application/x-protobuf")
if _, err := snappy.NewWriter(w).Write(data); err != nil {
w.Header().Set("Content-Encoding", "snappy")
compressed = snappy.Encode(nil, data)
if _, err := w.Write(compressed); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}

31
storage/remote/client.go
View file

@ -94,12 +94,8 @@ func (c *Client) Store(samples model.Samples) error {
return err
}
buf := bytes.Buffer{}
if _, err := snappy.NewWriter(&buf).Write(data); err != nil {
return err
}
httpReq, err := http.NewRequest("POST", c.url.String(), &buf)
compressed := snappy.Encode(nil, data)
httpReq, err := http.NewRequest("POST", c.url.String(), bytes.NewBuffer(compressed))
if err != nil {
// Errors from NewRequest are from unparseable URLs, so are not
// recoverable.
@ -107,7 +103,7 @@ func (c *Client) Store(samples model.Samples) error {
}
httpReq.Header.Add("Content-Encoding", "snappy")
httpReq.Header.Set("Content-Type", "application/x-protobuf")
httpReq.Header.Set("X-Prometheus-Remote-Write-Version", "0.0.1")
httpReq.Header.Set("X-Prometheus-Remote-Write-Version", "0.1.0")
ctx, cancel := context.WithTimeout(context.Background(), c.timeout)
defer cancel()
@ -151,17 +147,14 @@ func (c *Client) Read(ctx context.Context, from, through model.Time, matchers me
return nil, fmt.Errorf("unable to marshal read request: %v", err)
}
buf := bytes.Buffer{}
if _, err := snappy.NewWriter(&buf).Write(data); err != nil {
return nil, err
}
httpReq, err := http.NewRequest("POST", c.url.String(), &buf)
compressed := snappy.Encode(nil, data)
httpReq, err := http.NewRequest("POST", c.url.String(), bytes.NewBuffer(compressed))
if err != nil {
return nil, fmt.Errorf("unable to create request: %v", err)
}
httpReq.Header.Add("Content-Encoding", "snappy")
httpReq.Header.Set("Content-Type", "application/x-protobuf")
httpReq.Header.Set("X-Prometheus-Remote-Read-Version", "0.0.1")
httpReq.Header.Set("X-Prometheus-Remote-Read-Version", "0.1.0")
ctx, cancel := context.WithTimeout(ctx, c.timeout)
defer cancel()
@ -175,12 +168,18 @@ func (c *Client) Read(ctx context.Context, from, through model.Time, matchers me
return nil, fmt.Errorf("server returned HTTP status %s", httpResp.Status)
}
if data, err = ioutil.ReadAll(snappy.NewReader(httpResp.Body)); err != nil {
compressed, err = ioutil.ReadAll(httpResp.Body)
if err != nil {
return nil, fmt.Errorf("error reading response: %v", err)
}
uncompressed, err := snappy.Decode(nil, compressed)
if err != nil {
return nil, fmt.Errorf("error reading response: %v", err)
}
var resp ReadResponse
err = proto.Unmarshal(data, &resp)
err = proto.Unmarshal(uncompressed, &resp)
if err != nil {
return nil, fmt.Errorf("unable to unmarshal response body: %v", err)
}