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collect.go
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collect.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package tracing
import (
"context"
"time"
"github.com/rs/zerolog"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/codes"
"go.opentelemetry.io/otel/trace"
grpc_codes "google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
type Collected struct {
name string
attributes []attribute.KeyValue
}
func Name(name string) Collected {
return Collected{name: name}
}
func (c Collected) Attribute(kv ...attribute.KeyValue) Collected {
return Collected{name: c.name, attributes: append(c.attributes, kv...)}
}
func Collect0(ctx context.Context, tracer trace.Tracer, name Collected, callback func(context.Context) error, opts ...trace.SpanStartOption) error {
if tracer == nil {
return callback(ctx)
}
opts = append([]trace.SpanStartOption{trace.WithAttributes(name.attributes...)}, opts...)
ctx, span := tracer.Start(ctx, name.name, opts...)
defer span.End(trace.WithStackTrace(true))
err := callback(ctx)
if err != nil {
maybeCollectError(span, err)
}
return err
}
func Collect1[T any](ctx context.Context, tracer trace.Tracer, name Collected, callback func(context.Context) (T, error), opts ...trace.SpanStartOption) (T, error) {
if tracer == nil {
return callback(ctx)
}
opts = append([]trace.SpanStartOption{trace.WithAttributes(name.attributes...)}, opts...)
ctx, span := tracer.Start(ctx, name.name, opts...)
defer span.End(trace.WithStackTrace(true))
value, err := callback(ctx)
if err != nil {
maybeCollectError(span, err)
}
return value, err
}
func Collect2[T any, R any](ctx context.Context, tracer trace.Tracer, name Collected, callback func(context.Context) (T, R, error), opts ...trace.SpanStartOption) (T, R, error) {
if tracer == nil {
return callback(ctx)
}
opts = append([]trace.SpanStartOption{trace.WithAttributes(name.attributes...)}, opts...)
ctx, span := tracer.Start(ctx, name.name, opts...)
defer span.End(trace.WithStackTrace(true))
value0, value1, err := callback(ctx)
if err != nil {
maybeCollectError(span, err)
}
return value0, value1, err
}
func CollectAndLog0(ctx context.Context, tracer trace.Tracer, name Collected, callback func(context.Context) error, opts ...trace.SpanStartOption) error {
zlb := loggerFromAttrs(zerolog.Ctx(ctx).With(), name.attributes).Logger()
zlb.Info().Msgf("%s", name.name)
err := Collect0(zlb.WithContext(ctx), tracer, name, callback, opts...)
if err != nil {
zlb.Err(err).Msgf("%s (failed)", name.name)
}
return err
}
func CollectAndLog1[T any](ctx context.Context, tracer trace.Tracer, name Collected, callback func(context.Context) (T, error), opts ...trace.SpanStartOption) (T, error) {
zlb := loggerFromAttrs(zerolog.Ctx(ctx).With(), name.attributes).Logger()
zlb.Info().Msgf("%s", name.name)
v, err := Collect1[T](zlb.WithContext(ctx), tracer, name, callback, opts...)
if err != nil {
zlb.Err(err).Msgf("%s (failed)", name.name)
}
return v, err
}
func CollectAndLogDuration0(ctx context.Context, tracer trace.Tracer, name Collected, callback func(context.Context) error, opts ...trace.SpanStartOption) error {
zlb := loggerFromAttrs(zerolog.Ctx(ctx).With(), name.attributes).Logger()
t := time.Now()
zlb.Info().Msgf("%s (started)", name.name)
err := Collect0(zlb.WithContext(ctx), tracer, name, callback, opts...)
if err != nil {
zlb.Err(err).Msgf("%s (failed)", name.name)
} else {
zlb.Info().Dur("took", time.Since(t)).Msgf("%s (done)", name.name)
}
return err
}
func CollectAndLogDuration1[T any](ctx context.Context, tracer trace.Tracer, name Collected, callback func(context.Context) (T, error), opts ...trace.SpanStartOption) (T, error) {
zlb := loggerFromAttrs(zerolog.Ctx(ctx).With(), name.attributes).Logger()
t := time.Now()
zlb.Info().Msgf("%s (started)", name.name)
v, err := Collect1[T](zlb.WithContext(ctx), tracer, name, callback, opts...)
if err != nil {
zlb.Err(err).Msgf("%s (failed)", name.name)
} else {
zlb.Info().Dur("took", time.Since(t)).Msgf("%s (done)", name.name)
}
return v, err
}
func loggerFromAttrs(zlb zerolog.Context, attrs []attribute.KeyValue) zerolog.Context {
for _, attr := range attrs {
zlb = zlb.Interface(string(attr.Key), attr.Value.AsInterface())
}
return zlb
}
func maybeCollectError(span trace.Span, err error) {
span.RecordError(err)
s, _ := status.FromError(err)
statusCode, msg := serverStatus(s)
span.SetStatus(statusCode, msg)
}
func serverStatus(grpcStatus *status.Status) (codes.Code, string) {
switch grpcStatus.Code() {
case grpc_codes.Unknown,
grpc_codes.DeadlineExceeded,
grpc_codes.Unimplemented,
grpc_codes.Internal,
grpc_codes.Unavailable,
grpc_codes.DataLoss,
grpc_codes.ResourceExhausted,
grpc_codes.FailedPrecondition:
return codes.Error, grpcStatus.Message()
default:
return codes.Unset, ""
}
}