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martiantest.go
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martiantest.go
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// Copyright 2015 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package martiantest provides helper utilities for testing
// modifiers.
package martiantest
import (
"net/http"
"sync/atomic"
)
// Modifier keeps track of the number of requests and responses it has modified
// and can be configured to return errors or run custom functions.
type Modifier struct {
reqcount int32 // atomic
rescount int32 // atomic
reqerr error
reserr error
reqfunc func(*http.Request)
resfunc func(*http.Response)
}
// NewModifier returns a new test modifier.
func NewModifier() *Modifier {
return &Modifier{}
}
// RequestCount returns the number of requests modified.
func (m *Modifier) RequestCount() int32 {
return atomic.LoadInt32(&m.reqcount)
}
// ResponseCount returns the number of responses modified.
func (m *Modifier) ResponseCount() int32 {
return atomic.LoadInt32(&m.rescount)
}
// RequestModified returns whether a request has been modified.
func (m *Modifier) RequestModified() bool {
return m.RequestCount() != 0
}
// ResponseModified returns whether a response has been modified.
func (m *Modifier) ResponseModified() bool {
return m.ResponseCount() != 0
}
// RequestError overrides the error returned by ModifyRequest.
func (m *Modifier) RequestError(err error) {
m.reqerr = err
}
// ResponseError overrides the error returned by ModifyResponse.
func (m *Modifier) ResponseError(err error) {
m.reserr = err
}
// RequestFunc is a function to run during ModifyRequest.
func (m *Modifier) RequestFunc(reqfunc func(req *http.Request)) {
m.reqfunc = reqfunc
}
// ResponseFunc is a function to run during ModifyResponse.
func (m *Modifier) ResponseFunc(resfunc func(res *http.Response)) {
m.resfunc = resfunc
}
// ModifyRequest increases the count of requests seen and runs reqfunc if configured.
func (m *Modifier) ModifyRequest(req *http.Request) error {
atomic.AddInt32(&m.reqcount, 1)
if m.reqfunc != nil {
m.reqfunc(req)
}
return m.reqerr
}
// ModifyResponse increases the count of responses seen and runs resfunc if configured.
func (m *Modifier) ModifyResponse(res *http.Response) error {
atomic.AddInt32(&m.rescount, 1)
if m.resfunc != nil {
m.resfunc(res)
}
return m.reserr
}
// Reset resets the request and response counts, the custom
// functions, and the modifier errors.
func (m *Modifier) Reset() {
atomic.StoreInt32(&m.reqcount, 0)
atomic.StoreInt32(&m.rescount, 0)
m.reqfunc = nil
m.resfunc = nil
m.reqerr = nil
m.reserr = nil
}
// Matcher is a stubbed matcher used in tests.
type Matcher struct {
resval bool
reqval bool
}
// NewMatcher returns a pointer to martiantest.Matcher with the return values
// for MatchRequest and MatchResponse intiailized to true.
func NewMatcher() *Matcher {
return &Matcher{resval: true, reqval: true}
}
// ResponseEvaluatesTo sets the value returned by MatchResponse.
func (tm *Matcher) ResponseEvaluatesTo(value bool) {
tm.resval = value
}
// RequestEvaluatesTo sets the value returned by MatchRequest.
func (tm *Matcher) RequestEvaluatesTo(value bool) {
tm.reqval = value
}
// MatchRequest returns the stubbed value in tm.reqval.
func (tm *Matcher) MatchRequest(*http.Request) bool {
return tm.reqval
}
// MatchResponse returns the stubbed value in tm.resval.
func (tm *Matcher) MatchResponse(*http.Response) bool {
return tm.resval
}