Support ruler to retrieve proto format query response #6345
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -11,9 +11,11 @@ import ( | |
| "time" | ||
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| jsoniter "github.com/json-iterator/go" | ||
| "github.com/munnerz/goautoneg" | ||
| "github.com/opentracing/opentracing-go" | ||
| otlog "github.com/opentracing/opentracing-go/log" | ||
| "github.com/prometheus/common/model" | ||
| v1 "github.com/prometheus/prometheus/web/api/v1" | ||
| "github.com/weaveworks/common/httpgrpc" | ||
| "google.golang.org/grpc/status" | ||
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@@ -29,6 +31,9 @@ var ( | |
| SortMapKeys: true, | ||
| ValidateJsonRawMessage: false, | ||
| }.Froze() | ||
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| rulerMIMEType = v1.MIMEType{Type: "application", SubType: tripperware.QueryResponseCortexMIMESubType} | ||
| jsonMIMEType = v1.MIMEType{Type: "application", SubType: "json"} | ||
| ) | ||
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| type instantQueryCodec struct { | ||
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@@ -68,12 +73,18 @@ func (c instantQueryCodec) DecodeRequest(_ context.Context, r *http.Request, for | |
| result.Stats = r.FormValue("stats") | ||
| result.Path = r.URL.Path | ||
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| isSourceRuler := strings.Contains(r.Header.Get("User-Agent"), tripperware.RulerUserAgent) | ||
| if isSourceRuler { | ||
| // When the source is the Ruler, then forward whole headers | ||
| result.Headers = r.Header | ||
|
There was a problem hiding this comment. Nit: Consider returning here vs else block |
||
| } else { | ||
| // Include the specified headers from http request in prometheusRequest. | ||
| for _, header := range forwardHeaders { | ||
| for h, hv := range r.Header { | ||
| if strings.EqualFold(h, header) { | ||
| result.Headers[h] = hv | ||
| break | ||
| } | ||
| } | ||
| } | ||
| } | ||
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@@ -155,7 +166,11 @@ func (c instantQueryCodec) EncodeRequest(ctx context.Context, r tripperware.Requ | |
| } | ||
| } | ||
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| isSourceRuler := strings.Contains(h.Get("User-Agent"), tripperware.RulerUserAgent) | ||
| if !isSourceRuler { | ||
| // When the source is the Ruler, skip set header | ||
| tripperware.SetRequestHeaders(h, c.defaultCodecType, c.compression) | ||
| } | ||
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| req := &http.Request{ | ||
| Method: "GET", | ||
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@@ -168,7 +183,7 @@ func (c instantQueryCodec) EncodeRequest(ctx context.Context, r tripperware.Requ | |
| return req.WithContext(ctx), nil | ||
| } | ||
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| func (c instantQueryCodec) EncodeResponse(ctx context.Context, req *http.Request, res tripperware.Response) (*http.Response, error) { | ||
| sp, _ := opentracing.StartSpanFromContext(ctx, "APIResponse.ToHTTPResponse") | ||
| defer sp.Finish() | ||
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@@ -180,7 +195,7 @@ func (instantQueryCodec) EncodeResponse(ctx context.Context, res tripperware.Res | |
| queryStats := stats.FromContext(ctx) | ||
| tripperware.SetQueryResponseStats(a, queryStats) | ||
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| contentType, b, err := marshalResponse(a, req.Header.Get("Accept")) | ||
|
There was a problem hiding this comment. Should we only try to return non JSON response format if we know the request comes from Ruler? But tbh Idk if we can identify ruler requests or not. We probably have to do what you are doing here. WDYT? @alanprot @danielblando There was a problem hiding this comment. @yeya24 There was a problem hiding this comment. Yeah.. maybe we should define our internal MIME type so external calls will only get that format if they really wanna. There was a problem hiding this comment. This sounds worth trying. Let's hear from other maintainers, too |
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| if err != nil { | ||
| return nil, httpgrpc.Errorf(http.StatusInternalServerError, "error encoding response: %v", err) | ||
| } | ||
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@@ -189,7 +204,7 @@ func (instantQueryCodec) EncodeResponse(ctx context.Context, res tripperware.Res | |
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| resp := http.Response{ | ||
| Header: http.Header{ | ||
| "Content-Type": []string{contentType}, | ||
| }, | ||
| Body: io.NopCloser(bytes.NewBuffer(b)), | ||
| StatusCode: http.StatusOK, | ||
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@@ -217,3 +232,18 @@ func decorateWithParamName(err error, field string) error { | |
| } | ||
| return fmt.Errorf(errTmpl, field, err) | ||
| } | ||
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| func marshalResponse(resp *tripperware.PrometheusResponse, acceptHeader string) (string, []byte, error) { | ||
| for _, clause := range goautoneg.ParseAccept(acceptHeader) { | ||
| if jsonMIMEType.Satisfies(clause) { | ||
| b, err := json.Marshal(resp) | ||
| return tripperware.ApplicationJson, b, err | ||
| } else if rulerMIMEType.Satisfies(clause) { | ||
| b, err := resp.Marshal() | ||
| return tripperware.QueryResponseCortexMIMEType, b, err | ||
| } | ||
| } | ||
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| b, err := json.Marshal(resp) | ||
| return tripperware.ApplicationJson, b, err | ||
| } | ||
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Can we do
rulerMIMEType = tripperware.QueryResponseCortexMIMETypehere?There was a problem hiding this comment.
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The
tripperware.QueryResponseCortexMIMETypeis astring, so it is hard to use it toMIMETypedirectly.