122 lines
3.0 KiB
Go
122 lines
3.0 KiB
Go
package testutil
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import (
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"sort"
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"strings"
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)
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// RequestResponseMap is an ordered mapping from Requests to Responses
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type RequestResponseMap []RequestResponseMapping
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// RequestResponseMapping defines a Response to be sent in response to a given
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// Request
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type RequestResponseMapping struct {
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Request Request
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Response Response
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}
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// TODO(bbland): add support for request headers
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// Request is a simplified http.Request object
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type Request struct {
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// Method is the http method of the request, for example GET
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Method string
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// Route is the http route of this request
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Route string
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// QueryParams are the query parameters of this request
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QueryParams map[string][]string
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// Body is the byte contents of the http request
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Body []byte
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}
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func (r Request) String() string {
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queryString := ""
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if len(r.QueryParams) > 0 {
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queryString = "?"
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keys := make([]string, 0, len(r.QueryParams))
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for k := range r.QueryParams {
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keys = append(keys, k)
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}
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sort.Strings(keys)
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for _, k := range keys {
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queryString += strings.Join(r.QueryParams[k], "&") + "&"
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}
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queryString = queryString[:len(queryString)-1]
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}
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return fmt.Sprintf("%s %s%s\n%s", r.Method, r.Route, queryString, r.Body)
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}
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// Response is a simplified http.Response object
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type Response struct {
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// Statuscode is the http status code of the Response
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StatusCode int
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// Headers are the http headers of this Response
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Headers http.Header
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// Body is the response body
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Body []byte
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}
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// testHandler is an http.Handler with a defined mapping from Request to an
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// ordered list of Response objects
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type testHandler struct {
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responseMap map[string][]Response
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}
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// NewHandler returns a new test handler that responds to defined requests
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// with specified responses
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// Each time a Request is received, the next Response is returned in the
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// mapping, until no Responses are defined, at which point a 404 is sent back
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func NewHandler(requestResponseMap RequestResponseMap) http.Handler {
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responseMap := make(map[string][]Response)
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for _, mapping := range requestResponseMap {
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responses, ok := responseMap[mapping.Request.String()]
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if ok {
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responseMap[mapping.Request.String()] = append(responses, mapping.Response)
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} else {
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responseMap[mapping.Request.String()] = []Response{mapping.Response}
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}
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}
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return &testHandler{responseMap: responseMap}
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}
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func (app *testHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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defer r.Body.Close()
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requestBody, _ := ioutil.ReadAll(r.Body)
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request := Request{
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Method: r.Method,
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Route: r.URL.Path,
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QueryParams: r.URL.Query(),
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Body: requestBody,
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}
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responses, ok := app.responseMap[request.String()]
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if !ok || len(responses) == 0 {
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http.NotFound(w, r)
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return
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}
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response := responses[0]
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app.responseMap[request.String()] = responses[1:]
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responseHeader := w.Header()
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for k, v := range response.Headers {
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responseHeader[k] = v
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}
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w.WriteHeader(response.StatusCode)
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io.Copy(w, bytes.NewReader(response.Body))
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}
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