/
options.go
76 lines (63 loc) · 1.9 KB
/
options.go
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// Copyright 2017 Michal Witkowski. All Rights Reserved.
// See LICENSE for licensing terms.
package http_opentracing
import (
"net/http"
"github.com/opentracing/opentracing-go"
)
var (
defaultOptions = &options{
filterOutFunc: nil,
statusCodeErrorFunc: DefaultStatusCodeIsError,
tracer: nil,
}
)
// FilterFunc allows users to provide a function that filters out certain methods from being traced.
//
// If it returns false, the given request will not be traced.
type FilterFunc func(req *http.Request) bool
// StatusCodeIsError allows the customization of which requests are considered errors in the tracing system.
type StatusCodeIsError func(statusCode int) bool
type options struct {
filterOutFunc FilterFunc
statusCodeErrorFunc StatusCodeIsError
tracer opentracing.Tracer
}
func evaluateOptions(opts []Option) *options {
optCopy := &options{}
*optCopy = *defaultOptions
for _, o := range opts {
o(optCopy)
}
if optCopy.tracer == nil {
optCopy.tracer = opentracing.GlobalTracer()
}
return optCopy
}
type Option func(*options)
// WithFilterFunc customizes the function used for deciding whether a given call is traced or not.
func WithFilterFunc(f FilterFunc) Option {
return func(o *options) {
o.filterOutFunc = f
}
}
// WithStatusCodeIsError customizes the function used for deciding whether a given call was an error
func WithStatusCodeIsError(f StatusCodeIsError) Option {
return func(o *options) {
o.statusCodeErrorFunc = f
}
}
// WithTracer sets a custom tracer to be used for this middleware, otherwise the opentracing.GlobalTracer is used.
func WithTracer(tracer opentracing.Tracer) Option {
return func(o *options) {
o.tracer = tracer
}
}
func DefaultStatusCodeIsError(statusCode int) bool {
if statusCode < 400 {
return false
} else if statusCode == 404 { // not found shouldn't really be an error, too common.
return false
}
return true
}