forked from DataDog/dd-trace-go
/
option.go
74 lines (64 loc) · 1.9 KB
/
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 2016-2020 Datadog, Inc.
package gin
import (
"math"
"net/http"
"github.com/gin-gonic/gin"
"gopkg.in/DataDog/dd-trace-go.v1/internal/globalconfig"
)
type config struct {
analyticsRate float64
resourceNamer func(c *gin.Context) string
}
func newConfig() *config {
return &config{
analyticsRate: globalconfig.AnalyticsRate(),
resourceNamer: defaultResourceNamer,
}
}
// Option specifies instrumentation configuration options.
type Option func(*config)
// 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()
}
}
}
// WithResourceNamer specifies a function which will be used to obtain a resource name for a given
// gin request, using the request's context.
func WithResourceNamer(namer func(c *gin.Context) string) Option {
return func(cfg *config) {
cfg.resourceNamer = namer
}
}
func defaultResourceNamer(c *gin.Context) string {
// getName is a hacky way to check whether *gin.Context implements the FullPath()
// method introduced in v1.4.0, falling back to the previous implementation otherwise.
getName := func(req *http.Request, c interface{ HandlerName() string }) string {
if fp, ok := c.(interface {
FullPath() string
}); ok {
return req.Method + " " + fp.FullPath()
}
return c.HandlerName()
}
return getName(c.Request, c)
}