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get_cancel_get.go
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/
get_cancel_get.go
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package check
import (
"context"
"errors"
"github.com/google/uuid"
"github.com/nwtgck/piping-server-check/oneshot"
"io"
"net/http"
"net/http/httptrace"
"strings"
"time"
)
func get_cancel_get() Check {
return Check{
Name: getCheckName(),
run: func(config *Config, reporter RunCheckReporter) {
defer reporter.Close()
serverUrl, ok, stopServerIfNeed := prepareServerUrl(config, reporter)
if !ok {
return
}
defer stopServerIfNeed()
getHttpClient := newHTTPClient(config.Protocol, config.TlsSkipVerifyCert)
defer getHttpClient.CloseIdleConnections()
path := "/" + uuid.NewString()
url := serverUrl + path
getFailed := false
canceledCh := make(chan struct{})
func() {
getReqWroteRequestCh := make(chan struct{})
getReq1, err := http.NewRequest("GET", url, nil)
if err != nil {
reporter.Report(NewRunCheckResultWithOneError(NewError("failed to create GET request", err)))
getFailed = true
return
}
ctx, cancel := context.WithCancel(context.Background())
getReq1 = getReq1.WithContext(ctx)
getReq1 = getReq1.WithContext(httptrace.WithClientTrace(getReq1.Context(), &httptrace.ClientTrace{
WroteRequest: func(info httptrace.WroteRequestInfo) {
getReqWroteRequestCh <- struct{}{}
},
}))
go func() {
if config.Protocol == ProtocolH3 {
// httptrace not supported: https://github.com/quic-go/quic-go/issues/3342
reporter.Report(RunCheckResult{Warnings: []ResultWarning{NewWarning("Sorry. WroteRequest detection not supported in HTTP/3", nil)}})
<-time.After(config.GetReqWroteRequestWaitForH3)
} else {
<-getReqWroteRequestCh
}
// Difficult to detect whether server handles GET request
time.Sleep(config.WaitDurationBetweenReceiverWroteRequestAndCancel)
cancel()
canceledCh <- struct{}{}
}()
_, err = getHttpClient.Do(getReq1)
if errors.Is(err, context.Canceled) {
return
}
if err != nil {
reporter.Report(NewRunCheckResultWithOneError(NewError("failed to GET", err)))
getFailed = true
return
}
reporter.Report(NewRunCheckResultWithOneError(NewError("expected not to receive a response but GET response received", err)))
}()
if getFailed {
return
}
<-canceledCh
time.Sleep(config.WaitDurationAfterReceiverCancel)
checkTransferForGetCancelGet(config, url, reporter)
return
},
}
}
func checkTransferForGetCancelGet(config *Config, url string, reporter RunCheckReporter) {
getHttpClient := newHTTPClient(config.Protocol, config.TlsSkipVerifyCert)
defer getHttpClient.CloseIdleConnections()
postHttpClient := newHTTPClient(config.Protocol, config.TlsSkipVerifyCert)
defer postHttpClient.CloseIdleConnections()
bodyString := "my message"
getRespOneshot := oneshot.NewOneshot[*http.Response]()
getReqWroteRequestCh := make(chan struct{})
go func() {
defer getRespOneshot.Done()
getReq, err := http.NewRequest("GET", url, nil)
if err != nil {
reporter.Report(NewRunCheckResultWithOneError(NewError("failed to create GET request", err)))
return
}
getReq = getReq.WithContext(httptrace.WithClientTrace(getReq.Context(), &httptrace.ClientTrace{
WroteRequest: func(info httptrace.WroteRequestInfo) {
getReqWroteRequestCh <- struct{}{}
},
}))
getResp, getOk := sendOrGetAndCheck(getHttpClient, getReq, config.Protocol, reporter)
if !getOk {
return
}
getRespOneshot.Send(getResp)
}()
postRespOneshot := oneshot.NewOneshot[*http.Response]()
go func() {
defer postRespOneshot.Done()
if config.Protocol == ProtocolH3 {
// httptrace not supported: https://github.com/quic-go/quic-go/issues/3342
reporter.Report(RunCheckResult{Warnings: []ResultWarning{NewWarning("Sorry. WroteRequest detection not supported in HTTP/3", nil)}})
<-time.After(config.GetReqWroteRequestWaitForH3)
} else {
<-getReqWroteRequestCh
}
postReq, err := http.NewRequest("POST", url, strings.NewReader(bodyString))
if err != nil {
reporter.Report(RunCheckResult{Errors: []ResultError{NewError("failed to create POST request", err)}})
return
}
postResp, postOk := sendOrGetAndCheck(getHttpClient, postReq, config.Protocol, reporter)
if !postOk {
return
}
postRespOneshot.Send(postResp)
}()
select {
case _, ok := <-getRespOneshot.Channel():
if !ok {
return
}
case _, ok := <-postRespOneshot.Channel():
if !ok {
return
}
}
getResp, ok := <-getRespOneshot.Channel()
if !ok {
return
}
bodyBytes, err := io.ReadAll(getResp.Body)
if err != nil {
reporter.Report(RunCheckResult{Errors: []ResultError{NewError("failed to read up", err)}})
return
}
if string(bodyBytes) != bodyString {
reporter.Report(RunCheckResult{Errors: []ResultError{NewError("message different", nil)}})
return
}
<-postRespOneshot.Channel()
reporter.Report(RunCheckResult{})
}