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