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handle_request.go
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/
handle_request.go
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// Copyright 2023 Princess B33f Heavy Industries / Dave Shanley
// SPDX-License-Identifier: MIT
package daemon
import (
"fmt"
"github.com/pb33f/libopenapi-validator/parameters"
"github.com/pb33f/libopenapi-validator/requests"
"github.com/pb33f/libopenapi-validator/responses"
"github.com/pb33f/ranch/model"
"github.com/pb33f/ranch/plank/utils"
"github.com/pb33f/wiretap/shared"
"io"
"net/http"
"time"
)
func (ws *WiretapService) handleHttpRequest(request *model.Request) {
lowResponseChan := make(chan *http.Response)
lowErrorChan := make(chan error)
var returnedResponse *http.Response
var returnedError error
// create validators.
requestValidator := requests.NewRequestBodyValidator(ws.docModel)
paramValidator := parameters.NewParameterValidator(ws.docModel)
responseValidator := responses.NewResponseBodyValidator(ws.docModel)
// validate the request
go ws.validateRequest(request, requestValidator, paramValidator, responseValidator)
// call the API being requested.
go ws.callAPI(request.HttpRequest, lowResponseChan, lowErrorChan)
doneWaitingForResponse:
for {
select {
case resp, ok := <-lowResponseChan:
if ok {
returnedResponse = resp
}
break doneWaitingForResponse
case err := <-lowErrorChan:
returnedError = err
break doneWaitingForResponse
}
}
if returnedResponse == nil && returnedError != nil {
utils.Log.Infof("[wiretap] request %s: Failed (%d)", request.HttpRequest.URL.String(), 500)
go ws.broadcastResponseError(request, cloneResponse(returnedResponse), returnedError)
request.HttpResponseWriter.WriteHeader(500)
wtError := shared.GenerateError("Unable to call API", 500, returnedError.Error(), "")
_, _ = request.HttpResponseWriter.Write(shared.MarshalError(wtError))
return
} else {
// validate response
go ws.validateResponse(request, responseValidator, cloneResponse(returnedResponse))
}
// send response back to client.
//go func() {
config := ws.controlsStore.GetValue(shared.ConfigKey).(*shared.WiretapConfiguration)
if config.GlobalAPIDelay > 0 {
time.Sleep(time.Duration(config.GlobalAPIDelay) * time.Millisecond) // simulate a slow response.
}
body, _ := io.ReadAll(returnedResponse.Body)
headers := extractHeaders(returnedResponse)
// wiretap needs to work from anywhere, so allow everything.
headers["Access-Control-Allow-Headers"] = "*"
headers["Access-Control-Allow-Origin"] = "*"
headers["Access-Control-Allow-Methods"] = "OPTIONS,POST,GET,DELETE,PATCH,PUT"
// write headers
for k, v := range headers {
request.HttpResponseWriter.Header().Set(k, fmt.Sprint(v))
}
utils.Log.Infof("[wiretap] request %s: completed (%d)", request.HttpRequest.URL.String(), returnedResponse.StatusCode)
// write the status code and body
request.HttpResponseWriter.WriteHeader(returnedResponse.StatusCode)
_, _ = request.HttpResponseWriter.Write(body)
}