forked from DataDog/dd-trace-go
/
gorm.go
119 lines (103 loc) · 3.78 KB
/
gorm.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2016-2020 Datadog, Inc.
// Package gorm provides helper functions for tracing the jinzhu/gorm package (https://github.com/jinzhu/gorm).
package gorm
import (
"context"
"math"
"time"
sqltraced "gopkg.in/DataDog/dd-trace-go.v1/contrib/database/sql"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/ext"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
"github.com/jinzhu/gorm"
)
const (
gormContextKey = "dd-trace-go:context"
gormConfigKey = "dd-trace-go:config"
gormSpanStartTimeKey = "dd-trace-go:span"
)
// Open opens a new (traced) database connection. The used dialect must be formerly registered
// using (gopkg.in/DataDog/dd-trace-go.v1/contrib/database/sql).Register.
func Open(dialect, source string, opts ...Option) (*gorm.DB, error) {
sqldb, err := sqltraced.Open(dialect, source)
if err != nil {
return nil, err
}
db, err := gorm.Open(dialect, sqldb)
if err != nil {
return db, err
}
return WithCallbacks(db, opts...), err
}
// WithCallbacks registers callbacks to the gorm.DB for tracing.
// It should be called once, after opening the db.
// The callbacks are triggered by Create, Update, Delete,
// Query and RowQuery operations.
func WithCallbacks(db *gorm.DB, opts ...Option) *gorm.DB {
afterFunc := func(operationName string) func(*gorm.Scope) {
return func(scope *gorm.Scope) {
after(scope, operationName)
}
}
cb := db.Callback()
cb.Create().Before("gorm:before_create").Register("dd-trace-go:before_create", before)
cb.Create().After("gorm:after_create").Register("dd-trace-go:after_create", afterFunc("gorm.create"))
cb.Update().Before("gorm:before_update").Register("dd-trace-go:before_update", before)
cb.Update().After("gorm:after_update").Register("dd-trace-go:after_update", afterFunc("gorm.update"))
cb.Delete().Before("gorm:before_delete").Register("dd-trace-go:before_delete", before)
cb.Delete().After("gorm:after_delete").Register("dd-trace-go:after_delete", afterFunc("gorm.delete"))
cb.Query().Before("gorm:query").Register("dd-trace-go:before_query", before)
cb.Query().After("gorm:after_query").Register("dd-trace-go:after_query", afterFunc("gorm.query"))
cb.RowQuery().Before("gorm:row_query").Register("dd-trace-go:before_row_query", before)
cb.RowQuery().After("gorm:row_query").Register("dd-trace-go:after_row_query", afterFunc("gorm.row_query"))
cfg := new(config)
defaults(cfg)
for _, fn := range opts {
fn(cfg)
}
return db.Set(gormConfigKey, cfg)
}
// WithContext attaches the specified context to the given db. The context will
// be used as a basis for creating new spans. An example use case is providing
// a context which contains a span to be used as a parent.
func WithContext(ctx context.Context, db *gorm.DB) *gorm.DB {
if ctx == nil {
return db
}
db = db.Set(gormContextKey, ctx)
return db
}
func before(scope *gorm.Scope) {
scope.Set(gormSpanStartTimeKey, time.Now())
}
func after(scope *gorm.Scope, operationName string) {
v, ok := scope.Get(gormContextKey)
if !ok {
return
}
ctx := v.(context.Context)
v, ok = scope.Get(gormConfigKey)
if !ok {
return
}
cfg := v.(*config)
v, ok = scope.Get(gormSpanStartTimeKey)
if !ok {
return
}
t, ok := v.(time.Time)
opts := []ddtrace.StartSpanOption{
tracer.StartTime(t),
tracer.ServiceName(cfg.serviceName),
tracer.SpanType(ext.SpanTypeSQL),
tracer.ResourceName(scope.SQL),
}
if !math.IsNaN(cfg.analyticsRate) {
opts = append(opts, tracer.Tag(ext.EventSampleRate, cfg.analyticsRate))
}
span, _ := tracer.StartSpanFromContext(ctx, operationName, opts...)
span.Finish(tracer.WithError(scope.DB().Error))
}