mirror of https://github.com/go-redis/redis.git
157 lines
3.6 KiB
Go
157 lines
3.6 KiB
Go
package redisotel
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import (
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"context"
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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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semconv "go.opentelemetry.io/otel/semconv/v1.7.0"
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"go.opentelemetry.io/otel/trace"
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"github.com/go-redis/redis/extra/rediscmd/v8"
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"github.com/go-redis/redis/v8"
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)
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const (
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defaultTracerName = "github.com/go-redis/redis/extra/redisotel"
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)
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type TracingHook struct {
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tracer trace.Tracer
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attrs []attribute.KeyValue
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dbStmtEnabled bool
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}
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func NewTracingHook(opts ...Option) *TracingHook {
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cfg := &config{
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tp: otel.GetTracerProvider(),
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attrs: []attribute.KeyValue{
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semconv.DBSystemRedis,
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},
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dbStmtEnabled: true,
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}
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for _, opt := range opts {
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opt.apply(cfg)
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}
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tracer := cfg.tp.Tracer(
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defaultTracerName,
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trace.WithInstrumentationVersion("semver:"+redis.Version()),
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)
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return &TracingHook{tracer: tracer, attrs: cfg.attrs, dbStmtEnabled: cfg.dbStmtEnabled}
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}
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func (th *TracingHook) BeforeProcess(ctx context.Context, cmd redis.Cmder) (context.Context, error) {
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if !trace.SpanFromContext(ctx).IsRecording() {
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return ctx, nil
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}
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opts := []trace.SpanStartOption{
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trace.WithSpanKind(trace.SpanKindClient),
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trace.WithAttributes(th.attrs...),
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}
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if th.dbStmtEnabled {
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opts = append(opts, trace.WithAttributes(
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semconv.DBStatementKey.String(rediscmd.CmdString(cmd)),
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))
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}
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ctx, _ = th.tracer.Start(ctx, cmd.FullName(), opts...)
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return ctx, nil
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}
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func (th *TracingHook) AfterProcess(ctx context.Context, cmd redis.Cmder) error {
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span := trace.SpanFromContext(ctx)
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if err := cmd.Err(); err != nil {
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recordError(ctx, span, err)
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}
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span.End()
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return nil
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}
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func (th *TracingHook) BeforeProcessPipeline(ctx context.Context, cmds []redis.Cmder) (context.Context, error) {
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if !trace.SpanFromContext(ctx).IsRecording() {
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return ctx, nil
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}
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summary, cmdsString := rediscmd.CmdsString(cmds)
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opts := []trace.SpanStartOption{
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trace.WithSpanKind(trace.SpanKindClient),
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trace.WithAttributes(th.attrs...),
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trace.WithAttributes(
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attribute.Int("db.redis.num_cmd", len(cmds)),
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),
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}
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if th.dbStmtEnabled {
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opts = append(opts, trace.WithAttributes(
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semconv.DBStatementKey.String(cmdsString),
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))
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}
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ctx, _ = th.tracer.Start(ctx, "pipeline "+summary, opts...)
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return ctx, nil
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}
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func (th *TracingHook) AfterProcessPipeline(ctx context.Context, cmds []redis.Cmder) error {
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span := trace.SpanFromContext(ctx)
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if err := cmds[0].Err(); err != nil {
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recordError(ctx, span, err)
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}
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span.End()
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return nil
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}
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func recordError(ctx context.Context, span trace.Span, err error) {
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if err != redis.Nil {
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span.RecordError(err)
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span.SetStatus(codes.Error, err.Error())
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}
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}
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type config struct {
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tp trace.TracerProvider
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attrs []attribute.KeyValue
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dbStmtEnabled bool
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}
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// Option specifies instrumentation configuration options.
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type Option interface {
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apply(*config)
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}
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type optionFunc func(*config)
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func (o optionFunc) apply(c *config) {
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o(c)
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}
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// WithTracerProvider specifies a tracer provider to use for creating a tracer.
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// If none is specified, the global provider is used.
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func WithTracerProvider(provider trace.TracerProvider) Option {
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return optionFunc(func(cfg *config) {
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if provider != nil {
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cfg.tp = provider
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}
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})
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}
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// WithAttributes specifies additional attributes to be added to the span.
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func WithAttributes(attrs ...attribute.KeyValue) Option {
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return optionFunc(func(cfg *config) {
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cfg.attrs = append(cfg.attrs, attrs...)
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})
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}
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// WithDBStatement tells the tracing hook not to log raw redis commands.
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func WithDBStatement(on bool) Option {
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return optionFunc(func(conf *config) {
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conf.dbStmtEnabled = on
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})
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}
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