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Move write HTTP handler into own package
Move the write (ingest) handler to its own package.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| package write | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "fmt" | ||
| "io/ioutil" | ||
| "net/http" | ||
| "sort" | ||
| "sync" | ||
|
|
||
| "github.com/Sirupsen/logrus" | ||
| "github.com/golang/protobuf/proto" | ||
| "github.com/golang/snappy" | ||
| "github.com/mattbostock/athensdb/internal/cluster" | ||
| "github.com/mattbostock/athensdb/internal/remote" | ||
| "github.com/prometheus/prometheus/pkg/labels" | ||
| "github.com/prometheus/prometheus/storage" | ||
| "golang.org/x/net/context/ctxhttp" | ||
| ) | ||
|
|
||
| const ( | ||
| HttpHeaderInternalWrite = "X-AthensDB-Internal-Write-Version" | ||
| Route = "/receive" | ||
| ) | ||
|
|
||
| var ( | ||
| store storage.Storage | ||
| log *logrus.Logger | ||
| ) | ||
|
|
||
| func SetLogger(l *logrus.Logger) { | ||
| log = l | ||
| } | ||
| func SetStore(s storage.Storage) { | ||
| store = s | ||
| } | ||
|
|
||
| func Handler(w http.ResponseWriter, r *http.Request) { | ||
| 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 | ||
| } | ||
|
|
||
| var req remote.WriteRequest | ||
| if err := proto.Unmarshal(reqBuf, &req); err != nil { | ||
| http.Error(w, err.Error(), http.StatusBadRequest) | ||
| return | ||
| } | ||
|
|
||
| appender, err := store.Appender() | ||
| if err != nil { | ||
| // FIXME: Make error more useful | ||
| http.Error(w, err.Error(), http.StatusBadRequest) | ||
| return | ||
| } | ||
| defer appender.Commit() | ||
|
|
||
| var samples uint32 | ||
| for _, ts := range req.Timeseries { | ||
| m := make(labels.Labels, 0, len(ts.Labels)) | ||
| for _, l := range ts.Labels { | ||
| m = append(m, labels.Label{ | ||
| Name: l.Name, | ||
| Value: l.Value, | ||
| }) | ||
| } | ||
| sort.Sort(m) | ||
|
|
||
| for _, s := range ts.Samples { | ||
| // FIXME: Look at using AddFast | ||
| appender.Add(m, s.TimestampMs, s.Value) | ||
| samples++ | ||
| } | ||
| } | ||
|
|
||
| // This is an internal write, so don't replicate it to other nodes | ||
| if r.Header.Get(HttpHeaderInternalWrite) != "" { | ||
| log.Debugf("Received %d samples from another node in the cluster", samples) | ||
| return | ||
| } | ||
|
|
||
| var wg sync.WaitGroup | ||
| // FIXME: Avoid panic if the cluster is not yet initialised | ||
| nodes := cluster.Nodes() | ||
| var wgErrChan = make(chan error, len(nodes)) | ||
| for _, node := range nodes { | ||
| if node.Name() == cluster.LocalNode().Name() { | ||
| log.Debugf("Skipping local node %s", node) | ||
| continue | ||
| } | ||
|
|
||
| wg.Add(1) | ||
| go func(n *cluster.Node) { | ||
| defer wg.Done() | ||
|
|
||
| log.Debugf("Writing %d samples to %s", samples, n) | ||
|
|
||
| httpAddr, err := n.HTTPAddr() | ||
| if err != nil { | ||
| wgErrChan <- err | ||
| return | ||
| } | ||
| apiURL := fmt.Sprintf("%s%s%s", "http://", httpAddr, Route) | ||
| nodeReq, err := http.NewRequest("POST", apiURL, bytes.NewBuffer(compressed)) | ||
| if err != nil { | ||
| wgErrChan <- err | ||
| return | ||
| } | ||
| nodeReq.Header.Add("Content-Encoding", "snappy") | ||
| nodeReq.Header.Set("Content-Type", "application/x-protobuf") | ||
| nodeReq.Header.Set("X-Prometheus-Remote-Write-Version", "0.1.0") | ||
| nodeReq.Header.Set(HttpHeaderInternalWrite, "0.0.1") | ||
|
|
||
| // FIXME set timeout using context | ||
| httpResp, err := ctxhttp.Do(context.TODO(), http.DefaultClient, nodeReq) | ||
| if err != nil { | ||
| wgErrChan <- err | ||
| return | ||
| } | ||
| defer httpResp.Body.Close() | ||
| }(node) | ||
| } | ||
| // FIXME cancel requests if one fails | ||
| wg.Wait() | ||
|
|
||
| select { | ||
| case err := <-wgErrChan: | ||
| http.Error(w, err.Error(), http.StatusBadRequest) | ||
| return | ||
| default: | ||
| } | ||
| } |
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