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Merge pull request #2155 from jsternberg/otel-exporter
metrics: send metrics to the otel collector endpoint when active
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,189 @@ | ||
| package metrics | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "net/url" | ||
| "path" | ||
| "time" | ||
|
|
||
| "github.com/docker/cli/cli/command" | ||
| "github.com/moby/buildkit/util/tracing/detect" | ||
| "github.com/pkg/errors" | ||
| "go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc" | ||
| "go.opentelemetry.io/otel/metric" | ||
| "go.opentelemetry.io/otel/metric/noop" | ||
| sdkmetric "go.opentelemetry.io/otel/sdk/metric" | ||
| "go.opentelemetry.io/otel/sdk/metric/metricdata" | ||
| "golang.org/x/sync/errgroup" | ||
| ) | ||
|
|
||
| const ( | ||
| otelConfigFieldName = "otel" | ||
| shutdownTimeout = 2 * time.Second | ||
| ) | ||
|
|
||
| // ReportFunc is invoked to signal the metrics should be sent to the | ||
| // desired endpoint. It should be invoked on application shutdown. | ||
| type ReportFunc func() | ||
|
|
||
| // MeterProvider returns a MeterProvider suitable for CLI usage. | ||
| // The primary difference between this metric reader and a more typical | ||
| // usage is that metric reporting only happens once when ReportFunc | ||
| // is invoked. | ||
| func MeterProvider(cli command.Cli) (metric.MeterProvider, ReportFunc, error) { | ||
| var exps []sdkmetric.Exporter | ||
|
|
||
| if exp, err := dockerOtelExporter(cli); err != nil { | ||
| return nil, nil, err | ||
| } else if exp != nil { | ||
| exps = append(exps, exp) | ||
| } | ||
|
|
||
| if exp, err := detectOtlpExporter(context.Background()); err != nil { | ||
| return nil, nil, err | ||
| } else if exp != nil { | ||
| exps = append(exps, exp) | ||
| } | ||
|
|
||
| if len(exps) == 0 { | ||
| // No exporters are configured so use a noop provider. | ||
| return noop.NewMeterProvider(), func() {}, nil | ||
| } | ||
|
|
||
| // Use delta temporality because, since this is a CLI program, we can never | ||
| // know the cumulative value. | ||
| reader := sdkmetric.NewManualReader( | ||
| sdkmetric.WithTemporalitySelector(deltaTemporality), | ||
| ) | ||
| mp := sdkmetric.NewMeterProvider( | ||
| sdkmetric.WithResource(detect.Resource()), | ||
| sdkmetric.WithReader(reader), | ||
| ) | ||
| return mp, reportFunc(reader, exps), nil | ||
| } | ||
|
|
||
| // reportFunc returns a ReportFunc for collecting ResourceMetrics and then | ||
| // exporting them to the configured Exporter. | ||
| func reportFunc(reader sdkmetric.Reader, exps []sdkmetric.Exporter) ReportFunc { | ||
| return func() { | ||
| ctx, cancel := context.WithTimeout(context.Background(), shutdownTimeout) | ||
| defer cancel() | ||
|
|
||
| var rm metricdata.ResourceMetrics | ||
| if err := reader.Collect(ctx, &rm); err != nil { | ||
| // Error when collecting metrics. Do not send any. | ||
| return | ||
| } | ||
|
|
||
| var eg errgroup.Group | ||
| for _, exp := range exps { | ||
| exp := exp | ||
| eg.Go(func() error { | ||
| _ = exp.Export(ctx, &rm) | ||
| _ = exp.Shutdown(ctx) | ||
| return nil | ||
| }) | ||
| } | ||
|
|
||
| // Can't report an error because we don't allow it to. | ||
| _ = eg.Wait() | ||
| } | ||
| } | ||
|
|
||
| // dockerOtelExporter reads the CLI metadata to determine an OTLP exporter | ||
| // endpoint for docker metrics to be sent. | ||
| // | ||
| // This location, configuration, and usage is hard-coded as part of | ||
| // sending usage statistics so this metric reporting is not meant to be | ||
| // user facing. | ||
| func dockerOtelExporter(cli command.Cli) (sdkmetric.Exporter, error) { | ||
| endpoint, err := otelExporterOtlpEndpoint(cli) | ||
| if endpoint == "" || err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // Parse the endpoint. The docker config expects the endpoint to be | ||
| // in the form of a URL to match the environment variable, but this | ||
| // option doesn't correspond directly to WithEndpoint. | ||
| // | ||
| // We pretend we're the same as the environment reader. | ||
| u, err := url.Parse(endpoint) | ||
| if err != nil { | ||
| return nil, errors.Errorf("docker otel endpoint is invalid: %s", err) | ||
| } | ||
|
|
||
| var opts []otlpmetricgrpc.Option | ||
| switch u.Scheme { | ||
| case "unix": | ||
| // Unix sockets are a bit weird. OTEL seems to imply they | ||
| // can be used as an environment variable and are handled properly, | ||
| // but they don't seem to be as the behavior of the environment variable | ||
| // is to strip the scheme from the endpoint, but the underlying implementation | ||
| // needs the scheme to use the correct resolver. | ||
| // | ||
| // We'll just handle this in a special way and add the unix:// back to the endpoint. | ||
| opts = []otlpmetricgrpc.Option{ | ||
| otlpmetricgrpc.WithEndpoint(fmt.Sprintf("unix://%s", path.Join(u.Host, u.Path))), | ||
| otlpmetricgrpc.WithInsecure(), | ||
| } | ||
| case "http": | ||
| opts = []otlpmetricgrpc.Option{ | ||
| // Omit the scheme when using http or https. | ||
| otlpmetricgrpc.WithEndpoint(path.Join(u.Host, u.Path)), | ||
| otlpmetricgrpc.WithInsecure(), | ||
| } | ||
| default: | ||
| opts = []otlpmetricgrpc.Option{ | ||
| // Omit the scheme when using http or https. | ||
| otlpmetricgrpc.WithEndpoint(path.Join(u.Host, u.Path)), | ||
| } | ||
| } | ||
|
|
||
| // Hardcoded endpoint from the endpoint. | ||
| exp, err := otlpmetricgrpc.New(context.Background(), opts...) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return exp, nil | ||
| } | ||
|
|
||
| // otelExporterOtlpEndpoint retrieves the OTLP endpoint used for the docker reporter | ||
| // from the current context. | ||
| func otelExporterOtlpEndpoint(cli command.Cli) (string, error) { | ||
| meta, err := cli.ContextStore().GetMetadata(cli.CurrentContext()) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| var otelCfg interface{} | ||
| switch m := meta.Metadata.(type) { | ||
| case command.DockerContext: | ||
| otelCfg = m.AdditionalFields[otelConfigFieldName] | ||
| case map[string]interface{}: | ||
| otelCfg = m[otelConfigFieldName] | ||
| } | ||
|
|
||
| if otelCfg == nil { | ||
| return "", nil | ||
| } | ||
|
|
||
| otelMap, ok := otelCfg.(map[string]interface{}) | ||
| if !ok { | ||
| return "", errors.Errorf( | ||
| "unexpected type for field %q: %T (expected: %T)", | ||
| otelConfigFieldName, | ||
| otelCfg, | ||
| otelMap, | ||
| ) | ||
| } | ||
|
|
||
| // keys from https://opentelemetry.io/docs/concepts/sdk-configuration/otlp-exporter-configuration/ | ||
| endpoint, _ := otelMap["OTEL_EXPORTER_OTLP_ENDPOINT"].(string) | ||
| return endpoint, nil | ||
| } | ||
|
|
||
| // deltaTemporality sets the Temporality of every instrument to delta. | ||
| func deltaTemporality(_ sdkmetric.InstrumentKind) metricdata.Temporality { | ||
| return metricdata.DeltaTemporality | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| package metrics | ||
|
|
||
| import ( | ||
| "context" | ||
| "os" | ||
|
|
||
| "github.com/pkg/errors" | ||
| "go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc" | ||
| "go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp" | ||
| sdkmetric "go.opentelemetry.io/otel/sdk/metric" | ||
| ) | ||
|
|
||
| // detectOtlpExporter configures a metrics exporter based on environment variables. | ||
| // This is similar to the version of this in buildkit, but we need direct access | ||
| // to the exporter and the prometheus exporter doesn't work at all in a CLI context. | ||
| // | ||
| // There's some duplication here which I hope to remove when the detect package | ||
| // is refactored or extracted from buildkit so it can be utilized here. | ||
| // | ||
| // This version of the exporter is public facing in contrast to the | ||
| // docker otel collector. | ||
| func detectOtlpExporter(ctx context.Context) (sdkmetric.Exporter, error) { | ||
| set := os.Getenv("OTEL_METRICS_EXPORTER") == "otlp" || os.Getenv("OTEL_EXPORTER_OTLP_ENDPOINT") != "" || os.Getenv("OTEL_EXPORTER_OTLP_METRICS_ENDPOINT") != "" | ||
| if !set { | ||
| return nil, nil | ||
| } | ||
|
|
||
| proto := os.Getenv("OTEL_EXPORTER_OTLP_METRICS_PROTOCOL") | ||
| if proto == "" { | ||
| proto = os.Getenv("OTEL_EXPORTER_OTLP_PROTOCOL") | ||
| } | ||
| if proto == "" { | ||
| proto = "grpc" | ||
| } | ||
|
|
||
| switch proto { | ||
| case "grpc": | ||
| return otlpmetricgrpc.New(ctx, | ||
| otlpmetricgrpc.WithTemporalitySelector(deltaTemporality), | ||
| ) | ||
| case "http/protobuf": | ||
| return otlpmetrichttp.New(ctx, | ||
| otlpmetrichttp.WithTemporalitySelector(deltaTemporality), | ||
| ) | ||
| // case "http/json": // unsupported by library | ||
| default: | ||
| return nil, errors.Errorf("unsupported otlp protocol %v", proto) | ||
| } | ||
| } |