gotosocial/internal/tracing/tracing.go

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// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//go:build !notracing
package tracing
import (
"context"
"fmt"
"codeberg.org/gruf/go-kv"
"github.com/gin-gonic/gin"
"github.com/uptrace/bun"
"github.com/uptrace/bun/extra/bunotel"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
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"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/resource"
"go.opentelemetry.io/otel/sdk/trace"
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semconv "go.opentelemetry.io/otel/semconv/v1.20.0"
httpconv "go.opentelemetry.io/otel/semconv/v1.20.0/httpconv"
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oteltrace "go.opentelemetry.io/otel/trace"
"github.com/superseriousbusiness/gotosocial/internal/config"
"github.com/superseriousbusiness/gotosocial/internal/gtscontext"
"github.com/superseriousbusiness/gotosocial/internal/log"
)
const (
tracerKey = "gotosocial-server-tracer"
tracerName = "github.com/superseriousbusiness/gotosocial/internal/tracing"
)
func Initialize() error {
if !config.GetTracingEnabled() {
return nil
}
insecure := config.GetTracingInsecureTransport()
var tpo trace.TracerProviderOption
switch config.GetTracingTransport() {
case "grpc":
opts := []otlptracegrpc.Option{
otlptracegrpc.WithEndpoint(config.GetTracingEndpoint()),
}
if insecure {
opts = append(opts, otlptracegrpc.WithInsecure())
}
exp, err := otlptracegrpc.New(context.Background(), opts...)
if err != nil {
return fmt.Errorf("building tracing exporter: %w", err)
}
tpo = trace.WithBatcher(exp)
case "http":
opts := []otlptracehttp.Option{
otlptracehttp.WithEndpoint(config.GetTracingEndpoint()),
}
if insecure {
opts = append(opts, otlptracehttp.WithInsecure())
}
exp, err := otlptracehttp.New(context.Background(), opts...)
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if err != nil {
return fmt.Errorf("building tracing exporter: %w", err)
}
tpo = trace.WithBatcher(exp)
default:
return fmt.Errorf("invalid tracing transport: %s", config.GetTracingTransport())
}
r, _ := resource.Merge(
resource.Default(),
resource.NewWithAttributes(
semconv.SchemaURL,
semconv.ServiceName("GoToSocial"),
),
)
tp := trace.NewTracerProvider(
tpo,
trace.WithResource(r),
)
otel.SetTracerProvider(tp)
propagator := propagation.NewCompositeTextMapPropagator(
propagation.TraceContext{},
propagation.Baggage{},
)
otel.SetTextMapPropagator(propagator)
log.Hook(func(ctx context.Context, kvs []kv.Field) []kv.Field {
span := oteltrace.SpanFromContext(ctx)
if span != nil && span.SpanContext().HasTraceID() {
return append(kvs, kv.Field{K: "traceID", V: span.SpanContext().TraceID().String()})
}
return kvs
})
return nil
}
// InstrumentGin is a middleware injecting tracing information based on the
// otelgin implementation found at
// https://github.com/open-telemetry/opentelemetry-go-contrib/blob/main/instrumentation/github.com/gin-gonic/gin/otelgin/gintrace.go
func InstrumentGin() gin.HandlerFunc {
provider := otel.GetTracerProvider()
tracer := provider.Tracer(
tracerName,
oteltrace.WithInstrumentationVersion(config.GetSoftwareVersion()),
)
propagator := otel.GetTextMapPropagator()
return func(c *gin.Context) {
spanName := c.FullPath()
// Do not trace a request if it didn't match a route. This doesn't omit
// all 404s as a request matching /:user for a user that doesn't exist
// still matches the route
if spanName == "" {
c.Next()
return
}
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c.Set(tracerKey, tracer)
savedCtx := c.Request.Context()
defer func() {
c.Request = c.Request.WithContext(savedCtx)
}()
ctx := propagator.Extract(savedCtx, propagation.HeaderCarrier(c.Request.Header))
opts := []oteltrace.SpanStartOption{
oteltrace.WithAttributes(httpconv.ServerRequest(config.GetHost(), c.Request)...),
oteltrace.WithSpanKind(oteltrace.SpanKindServer),
}
rAttr := semconv.HTTPRoute(spanName)
opts = append(opts, oteltrace.WithAttributes(rAttr))
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id := gtscontext.RequestID(c.Request.Context())
if id != "" {
opts = append(opts, oteltrace.WithAttributes(attribute.String("requestID", id)))
}
ctx, span := tracer.Start(ctx, spanName, opts...)
defer span.End()
// pass the span through the request context
c.Request = c.Request.WithContext(ctx)
// serve the request to the next middleware
c.Next()
status := c.Writer.Status()
span.SetStatus(httpconv.ServerStatus(status))
if status > 0 {
span.SetAttributes(semconv.HTTPStatusCode(status))
}
if len(c.Errors) > 0 {
span.SetAttributes(attribute.String("gin.errors", c.Errors.String()))
}
}
}
func InjectRequestID() gin.HandlerFunc {
return func(c *gin.Context) {
id := gtscontext.RequestID(c.Request.Context())
if id != "" {
span := oteltrace.SpanFromContext(c.Request.Context())
span.SetAttributes(attribute.String("requestID", id))
}
}
}
func InstrumentBun() bun.QueryHook {
return bunotel.NewQueryHook(
bunotel.WithFormattedQueries(true),
)
}