server: use docker/go-metrics utilities for prometheus, add "no_metrics" build-tag #1659
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,41 @@ | ||
| //go:build !no_metrics | ||
| // +build !no_metrics | ||
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| package server | ||
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| import ( | ||
| "net/http" | ||
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| "github.com/docker/go-metrics" | ||
| "github.com/gorilla/mux" | ||
| ) | ||
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| // namespacePrefix is the namespace prefix used for prometheus metrics. | ||
| const namespacePrefix = "notary_server" | ||
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| // Server uses handlers.Changefeed for two separate routes. It's not allowed | ||
| // to register twice ("duplicate metrics collector registration attempted"), | ||
| // so checking if it's already instrumented, otherwise skip. | ||
| var instrumented = map[string]struct{}{} | ||
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| // instrumentedHandler instruments a server handler for monitoring with prometheus. | ||
| func instrumentedHandler(handlerName string, handler http.Handler) http.Handler { | ||
| if _, registered := instrumented[handlerName]; registered { | ||
| // handler for this operation is already registered. | ||
| return handler | ||
| } | ||
| instrumented[handlerName] = struct{}{} | ||
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| // Preserve the old situation, which used ConstLabels: "operation: <operation>" | ||
| // for metrics, but ConstLabels in go-metrics are per-namespace, and use | ||
| // ConstLabels: "handler: <handlerName>" (we pass operationName as handlerName). | ||
| namespace := metrics.NewNamespace(namespacePrefix, "http", metrics.Labels{"operation": handlerName}) | ||
| httpMetrics := namespace.NewDefaultHttpMetrics(handlerName) | ||
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| metrics.Register(namespace) | ||
| return metrics.InstrumentHandler(httpMetrics, handler) | ||
| } | ||
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| // handleMetricsEndpoint registers the /metrics endpoint. | ||
| func handleMetricsEndpoint(r *mux.Router) { | ||
| r.Methods("GET").Path("/metrics").Handler(metrics.Handler()) | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| //go:build no_metrics | ||
| // +build no_metrics | ||
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| package server | ||
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| import "net/http" | ||
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| // instrumentedHandler instruments a server handler for monitoring with prometheus. | ||
| func instrumentedHandler(_ string, handler http.Handler) http.Handler { | ||
| return handler | ||
| } | ||
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| // handleMetricsEndpoint registers the /metrics endpoint. | ||
| func handleMetricsEndpoint(r *interface{}) {} |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| //go:build !no_metrics | ||
| // +build !no_metrics | ||
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| package server | ||
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| import ( | ||
| "context" | ||
| "net/http" | ||
| "net/http/httptest" | ||
| "testing" | ||
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| "github.com/stretchr/testify/require" | ||
| "github.com/theupdateframework/notary/tuf/signed" | ||
| ) | ||
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| func TestMetricsEndpoint(t *testing.T) { | ||
| handler := RootHandler(context.Background(), nil, signed.NewEd25519(), | ||
| nil, nil, nil) | ||
| ts := httptest.NewServer(handler) | ||
| defer ts.Close() | ||
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| res, err := http.Get(ts.URL + "/metrics") | ||
| require.NoError(t, err) | ||
| require.Equal(t, http.StatusOK, res.StatusCode) | ||
| } |
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Had to add this to prevent the
handlers.Changefeedbeing registered twice; it's used for two endpoints, bot usingChangefeedas handlerName / operationName. Double check if it still works as expected with this.