mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
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244 lines
9.1 KiB
Go
244 lines
9.1 KiB
Go
// Copyright 2018 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package trace
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import (
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"context"
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"errors"
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"fmt"
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"os"
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"strings"
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"go.opencensus.io/trace"
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"go.opentelemetry.io/otel"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/codes"
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ottrace "go.opentelemetry.io/otel/trace"
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"google.golang.org/api/googleapi"
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"google.golang.org/genproto/googleapis/rpc/code"
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"google.golang.org/grpc/status"
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)
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const (
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// TelemetryPlatformTracingOpenCensus is the value to which the environment
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// variable GOOGLE_API_GO_EXPERIMENTAL_TELEMETRY_PLATFORM_TRACING should be
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// set to enable OpenCensus tracing.
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TelemetryPlatformTracingOpenCensus = "opencensus"
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// TelemetryPlatformTracingOpenCensus is the value to which the environment
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// variable GOOGLE_API_GO_EXPERIMENTAL_TELEMETRY_PLATFORM_TRACING should be
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// set to enable OpenTelemetry tracing.
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TelemetryPlatformTracingOpenTelemetry = "opentelemetry"
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// TelemetryPlatformTracingOpenCensus is the name of the environment
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// variable that can be set to change the default tracing from OpenCensus
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// to OpenTelemetry.
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TelemetryPlatformTracingVar = "GOOGLE_API_GO_EXPERIMENTAL_TELEMETRY_PLATFORM_TRACING"
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// OpenTelemetryTracerName is the name given to the OpenTelemetry Tracer
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// when it is obtained from the OpenTelemetry TracerProvider.
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OpenTelemetryTracerName = "cloud.google.com/go"
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)
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var (
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// OpenTelemetryTracingEnabled is true if the environment variable
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// GOOGLE_API_GO_EXPERIMENTAL_TELEMETRY_PLATFORM_TRACING is set to the
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// case-insensitive value "opentelemetry".
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//
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// Do not access directly. Use instead IsOpenTelemetryTracingEnabled or
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// IsOpenCensusTracingEnabled. Intended for use only in unit tests. Restore
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// original value after each test.
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OpenTelemetryTracingEnabled bool = strings.EqualFold(strings.TrimSpace(
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os.Getenv(TelemetryPlatformTracingVar)), TelemetryPlatformTracingOpenTelemetry)
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)
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// IsOpenCensusTracingEnabled returns true if the environment variable
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// GOOGLE_API_GO_EXPERIMENTAL_TELEMETRY_PLATFORM_TRACING is NOT set to the
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// case-insensitive value "opentelemetry".
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func IsOpenCensusTracingEnabled() bool {
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return !IsOpenTelemetryTracingEnabled()
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}
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// IsOpenTelemetryTracingEnabled returns true if the environment variable
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// GOOGLE_API_GO_EXPERIMENTAL_TELEMETRY_PLATFORM_TRACING is set to the
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// case-insensitive value "opentelemetry".
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func IsOpenTelemetryTracingEnabled() bool {
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return OpenTelemetryTracingEnabled
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}
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// StartSpan adds a span to the trace with the given name. If IsOpenCensusTracingEnabled
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// returns true, the span will be an OpenCensus span. If IsOpenTelemetryTracingEnabled
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// returns true, the span will be an OpenTelemetry span. Set the environment variable
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// GOOGLE_API_GO_EXPERIMENTAL_TELEMETRY_PLATFORM_TRACING to the case-insensitive
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// value "opentelemetry" before loading the package to use OpenTelemetry tracing.
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// The default will remain OpenCensus until May 29, 2024, at which time the default will
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// switch to "opentelemetry" and explicitly setting the environment variable to
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// "opencensus" will be required to continue using OpenCensus tracing.
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func StartSpan(ctx context.Context, name string) context.Context {
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if IsOpenTelemetryTracingEnabled() {
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ctx, _ = otel.GetTracerProvider().Tracer(OpenTelemetryTracerName).Start(ctx, name)
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} else {
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ctx, _ = trace.StartSpan(ctx, name)
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}
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return ctx
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}
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// EndSpan ends a span with the given error. If IsOpenCensusTracingEnabled
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// returns true, the span will be an OpenCensus span. If IsOpenTelemetryTracingEnabled
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// returns true, the span will be an OpenTelemetry span. Set the environment variable
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// GOOGLE_API_GO_EXPERIMENTAL_TELEMETRY_PLATFORM_TRACING to the case-insensitive
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// value "opentelemetry" before loading the package to use OpenTelemetry tracing.
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// The default will remain OpenCensus until May 29, 2024, at which time the default will
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// switch to "opentelemetry" and explicitly setting the environment variable to
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// "opencensus" will be required to continue using OpenCensus tracing.
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func EndSpan(ctx context.Context, err error) {
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if IsOpenTelemetryTracingEnabled() {
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span := ottrace.SpanFromContext(ctx)
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if err != nil {
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span.SetStatus(codes.Error, toOpenTelemetryStatusDescription(err))
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span.RecordError(err)
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}
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span.End()
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} else {
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span := trace.FromContext(ctx)
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if err != nil {
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span.SetStatus(toStatus(err))
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}
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span.End()
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}
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}
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// toStatus converts an error to an equivalent OpenCensus status.
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func toStatus(err error) trace.Status {
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var err2 *googleapi.Error
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if ok := errors.As(err, &err2); ok {
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return trace.Status{Code: httpStatusCodeToOCCode(err2.Code), Message: err2.Message}
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} else if s, ok := status.FromError(err); ok {
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return trace.Status{Code: int32(s.Code()), Message: s.Message()}
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} else {
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return trace.Status{Code: int32(code.Code_UNKNOWN), Message: err.Error()}
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}
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}
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// toOpenTelemetryStatus converts an error to an equivalent OpenTelemetry status description.
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func toOpenTelemetryStatusDescription(err error) string {
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var err2 *googleapi.Error
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if ok := errors.As(err, &err2); ok {
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return err2.Message
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} else if s, ok := status.FromError(err); ok {
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return s.Message()
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} else {
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return err.Error()
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}
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}
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// TODO(deklerk): switch to using OpenCensus function when it becomes available.
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// Reference: https://github.com/googleapis/googleapis/blob/26b634d2724ac5dd30ae0b0cbfb01f07f2e4050e/google/rpc/code.proto
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func httpStatusCodeToOCCode(httpStatusCode int) int32 {
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switch httpStatusCode {
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case 200:
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return int32(code.Code_OK)
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case 499:
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return int32(code.Code_CANCELLED)
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case 500:
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return int32(code.Code_UNKNOWN) // Could also be Code_INTERNAL, Code_DATA_LOSS
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case 400:
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return int32(code.Code_INVALID_ARGUMENT) // Could also be Code_OUT_OF_RANGE
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case 504:
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return int32(code.Code_DEADLINE_EXCEEDED)
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case 404:
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return int32(code.Code_NOT_FOUND)
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case 409:
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return int32(code.Code_ALREADY_EXISTS) // Could also be Code_ABORTED
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case 403:
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return int32(code.Code_PERMISSION_DENIED)
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case 401:
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return int32(code.Code_UNAUTHENTICATED)
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case 429:
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return int32(code.Code_RESOURCE_EXHAUSTED)
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case 501:
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return int32(code.Code_UNIMPLEMENTED)
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case 503:
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return int32(code.Code_UNAVAILABLE)
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default:
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return int32(code.Code_UNKNOWN)
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}
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}
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// TracePrintf retrieves the current OpenCensus or OpenTelemetry span from context, then:
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// * calls Span.Annotatef if OpenCensus is enabled; or
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// * calls Span.AddEvent if OpenTelemetry is enabled.
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//
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// If IsOpenCensusTracingEnabled returns true, the expected span must be an
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// OpenCensus span. If IsOpenTelemetryTracingEnabled returns true, the expected
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// span must be an OpenTelemetry span. Set the environment variable
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// GOOGLE_API_GO_EXPERIMENTAL_TELEMETRY_PLATFORM_TRACING to the case-insensitive
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// value "opentelemetry" before loading the package to use OpenTelemetry tracing.
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// The default will remain OpenCensus until May 29, 2024, at which time the default will
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// switch to "opentelemetry" and explicitly setting the environment variable to
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// "opencensus" will be required to continue using OpenCensus tracing.
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func TracePrintf(ctx context.Context, attrMap map[string]interface{}, format string, args ...interface{}) {
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if IsOpenTelemetryTracingEnabled() {
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attrs := otAttrs(attrMap)
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ottrace.SpanFromContext(ctx).AddEvent(fmt.Sprintf(format, args...), ottrace.WithAttributes(attrs...))
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} else {
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attrs := ocAttrs(attrMap)
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// TODO: (odeke-em): perhaps just pass around spans due to the cost
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// incurred from using trace.FromContext(ctx) yet we could avoid
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// throwing away the work done by ctx, span := trace.StartSpan.
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trace.FromContext(ctx).Annotatef(attrs, format, args...)
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}
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}
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// ocAttrs converts a generic map to OpenCensus attributes.
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func ocAttrs(attrMap map[string]interface{}) []trace.Attribute {
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var attrs []trace.Attribute
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for k, v := range attrMap {
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var a trace.Attribute
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switch v := v.(type) {
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case string:
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a = trace.StringAttribute(k, v)
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case bool:
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a = trace.BoolAttribute(k, v)
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case int:
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a = trace.Int64Attribute(k, int64(v))
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case int64:
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a = trace.Int64Attribute(k, v)
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default:
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a = trace.StringAttribute(k, fmt.Sprintf("%#v", v))
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}
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attrs = append(attrs, a)
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}
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return attrs
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}
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// otAttrs converts a generic map to OpenTelemetry attributes.
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func otAttrs(attrMap map[string]interface{}) []attribute.KeyValue {
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var attrs []attribute.KeyValue
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for k, v := range attrMap {
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var a attribute.KeyValue
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switch v := v.(type) {
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case string:
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a = attribute.Key(k).String(v)
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case bool:
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a = attribute.Key(k).Bool(v)
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case int:
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a = attribute.Key(k).Int(v)
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case int64:
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a = attribute.Key(k).Int64(v)
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default:
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a = attribute.Key(k).String(fmt.Sprintf("%#v", v))
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}
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attrs = append(attrs, a)
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}
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return attrs
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}
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