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mockservice.go
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mockservice.go
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// Copyright (c) 2017 Northwestern Mutual.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package steps
import (
"fmt"
"bytes"
"context"
"encoding/json"
"errors"
"strconv"
"net/http"
"net/http/httptest"
"github.com/northwesternmutual/kanali/metrics"
"github.com/northwesternmutual/kanali/spec"
"github.com/northwesternmutual/kanali/utils"
"github.com/opentracing/opentracing-go"
)
// MockServiceStep is factory that defines a step responsible for
// discovering a mock response for the incoming request
type MockServiceStep struct{}
// GetName retruns the name of the MockServiceStep step
func (step MockServiceStep) GetName() string {
return "Mock Service"
}
// Do executes the logic of the MockServiceStep step
func (step MockServiceStep) Do(ctx context.Context, proxy *spec.APIProxy, m *metrics.Metrics, w http.ResponseWriter, r *http.Request, resp *http.Response, trace opentracing.Span) error {
targetPath := utils.ComputeTargetPath(proxy.Spec.Path, proxy.Spec.Target, utils.ComputeURLPath(r.URL))
untypedMr, err := spec.MockResponseStore.Get(proxy.ObjectMeta.Namespace, proxy.Spec.Mock.ConfigMapName, targetPath, r.Method)
if err != nil {
return &utils.StatusError{Code: http.StatusInternalServerError, Err: fmt.Errorf("error retrieving mock response: %s", err.Error())}
}
if untypedMr == nil {
return &utils.StatusError{Code: http.StatusNotFound, Err: errors.New("no mock response found")}
}
mr, ok := untypedMr.(spec.Route)
if !ok {
return &utils.StatusError{Code: http.StatusNotFound, Err: errors.New("no mock response found")}
}
mockBodyData, err := json.Marshal(mr.Body)
if err != nil {
return &utils.StatusError{Code: http.StatusInternalServerError, Err: fmt.Errorf("the configmap %s in the namespace %s is not formated correctly. while data was found for the incoming route, it was not valid json",
proxy.Spec.Mock.ConfigMapName,
proxy.ObjectMeta.Namespace,
)}
}
// create new upstream header object
upstreamHeaders := http.Header{}
// currently, we are enforcing a json response
upstreamHeaders.Add("Content-Type", "application/json")
// create a fake response
responseRecorder := &httptest.ResponseRecorder{
Code: mr.Code,
Body: bytes.NewBuffer(mockBodyData),
HeaderMap: upstreamHeaders,
}
m.Add(metrics.Metric{Name: "http_response_code", Value: strconv.Itoa(mr.Code), Index: true})
*resp = *responseRecorder.Result()
return nil
}