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requestid.go
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requestid.go
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package middleware
import (
"net/http"
"go.uber.org/zap"
keelhttpcontext "github.com/foomo/keel/net/http/context"
"github.com/foomo/keel/net/http/provider"
)
type (
RequestIDOptions struct {
Provider provider.RequestID
RequestHeader []string
ResponseHeader string
SetRequestHeader bool
SetResponseHeader bool
SetContext bool
}
RequestIDOption func(*RequestIDOptions)
)
// GetDefaultRequestIDOptions returns the default options
func GetDefaultRequestIDOptions() RequestIDOptions {
return RequestIDOptions{
Provider: provider.DefaultRequestID,
RequestHeader: []string{"X-Request-ID", "Cf-Ray"},
ResponseHeader: "X-Request-ID",
SetRequestHeader: true,
SetResponseHeader: true,
SetContext: true,
}
}
// RequestIDWithRequestHeader middleware option
func RequestIDWithRequestHeader(v ...string) RequestIDOption {
return func(o *RequestIDOptions) {
o.RequestHeader = append(o.RequestHeader, v...)
}
}
// RequestIDWithResponseHeader middleware option
func RequestIDWithResponseHeader(v string) RequestIDOption {
return func(o *RequestIDOptions) {
o.ResponseHeader = v
}
}
// RequestIDWithSetRequestHeader middleware option
func RequestIDWithSetRequestHeader(v bool) RequestIDOption {
return func(o *RequestIDOptions) {
o.SetRequestHeader = v
}
}
// RequestIDWithSetResponseHeader middleware option
func RequestIDWithSetResponseHeader(v bool) RequestIDOption {
return func(o *RequestIDOptions) {
o.SetResponseHeader = v
}
}
// RequestIDWithGenerator middleware option
func RequestIDWithGenerator(v provider.RequestID) RequestIDOption {
return func(o *RequestIDOptions) {
o.Provider = v
}
}
// RequestIDWithSetContext middleware option
func RequestIDWithSetContext(v bool) RequestIDOption {
return func(o *RequestIDOptions) {
o.SetContext = v
}
}
// RequestID middleware
func RequestID(opts ...RequestIDOption) Middleware {
options := GetDefaultRequestIDOptions()
for _, opt := range opts {
if opt != nil {
opt(&options)
}
}
return RequestIDWithOptions(options)
}
// RequestIDWithOptions middleware
func RequestIDWithOptions(opts RequestIDOptions) Middleware {
return func(l *zap.Logger, name string, next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
var requestID string
for _, value := range opts.RequestHeader {
if requestID = r.Header.Get(value); requestID != "" {
break
}
}
if requestID == "" {
requestID = opts.Provider()
}
if requestID != "" && opts.SetContext {
r = r.WithContext(keelhttpcontext.SetRequestID(r.Context(), requestID))
}
if requestID != "" && opts.SetRequestHeader {
r.Header.Set(opts.ResponseHeader, requestID)
}
if requestID != "" && opts.SetResponseHeader {
if value := w.Header().Get(opts.ResponseHeader); value == "" {
w.Header().Add(opts.ResponseHeader, requestID)
}
}
next.ServeHTTP(w, r)
})
}
}