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option.go
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option.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 Datadog, Inc.
package gorm
import (
"math"
"gopkg.in/DataDog/dd-trace-go.v1/internal"
"gorm.io/gorm"
)
type config struct {
serviceName string
analyticsRate float64
dsn string
errCheck func(err error) bool
tagFns map[string]func(db *gorm.DB) interface{}
}
// Option represents an option that can be passed to Register, Open or OpenDB.
type Option func(*config)
func defaults(cfg *config) {
cfg.serviceName = "gorm.db"
// cfg.analyticsRate = globalconfig.AnalyticsRate()
if internal.BoolEnv("DD_TRACE_GORM_ANALYTICS_ENABLED", false) {
cfg.analyticsRate = 1.0
} else {
cfg.analyticsRate = math.NaN()
}
cfg.errCheck = func(error) bool { return true }
cfg.tagFns = make(map[string]func(db *gorm.DB) interface{})
}
// WithServiceName sets the given service name when registering a driver,
// or opening a database connection.
func WithServiceName(name string) Option {
return func(cfg *config) {
cfg.serviceName = name
}
}
// WithAnalytics enables Trace Analytics for all started spans.
func WithAnalytics(on bool) Option {
return func(cfg *config) {
if on {
cfg.analyticsRate = 1.0
} else {
cfg.analyticsRate = math.NaN()
}
}
}
// WithAnalyticsRate sets the sampling rate for Trace Analytics events
// correlated to started spans.
func WithAnalyticsRate(rate float64) Option {
return func(cfg *config) {
if rate >= 0.0 && rate <= 1.0 {
cfg.analyticsRate = rate
} else {
cfg.analyticsRate = math.NaN()
}
}
}
// WithErrorCheck specifies a function fn which determines whether the passed
// error should be marked as an error. The fn is called whenever a gorm operation
// finishes
func WithErrorCheck(fn func(err error) bool) Option {
return func(cfg *config) {
cfg.errCheck = fn
}
}
// WithCustomTag will cause the given tagFn to be evaluated after executing
// a query and attach the result to the span tagged by the key.
func WithCustomTag(tag string, tagFn func(db *gorm.DB) interface{}) Option {
return func(cfg *config) {
if tagFn != nil {
cfg.tagFns[tag] = tagFn
} else {
delete(cfg.tagFns, tag)
}
}
}