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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| package functions | ||
|
|
||
| import ( | ||
| "io" | ||
| "io/ioutil" | ||
| "log" | ||
| "net" | ||
| "net/http" | ||
| "net/url" | ||
| "os" | ||
| "os/exec" | ||
| "sync" | ||
| "time" | ||
| ) | ||
|
|
||
| // HTTPFunctionRunner creates and maintains one process responsible for handling all calls | ||
| type HTTPFunctionRunner struct { | ||
| Process string | ||
| ProcessArgs []string | ||
| Command *exec.Cmd | ||
| StdinPipe io.WriteCloser | ||
| StdoutPipe io.ReadCloser | ||
| Stderr io.Writer | ||
| Mutex sync.Mutex | ||
| Client *http.Client | ||
| UpstreamURL *url.URL | ||
| } | ||
|
|
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| // Start forks the process used for processing incoming requests | ||
| func (f *HTTPFunctionRunner) Start() error { | ||
| cmd := exec.Command(f.Process, f.ProcessArgs...) | ||
|
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| var stdinErr error | ||
| var stdoutErr error | ||
|
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| f.Command = cmd | ||
| f.StdinPipe, stdinErr = cmd.StdinPipe() | ||
| if stdinErr != nil { | ||
| return stdinErr | ||
| } | ||
|
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| f.StdoutPipe, stdoutErr = cmd.StdoutPipe() | ||
| if stdoutErr != nil { | ||
| return stdoutErr | ||
| } | ||
|
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| errPipe, _ := cmd.StderrPipe() | ||
|
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| // Prints stderr to console and is picked up by container logging driver. | ||
| go func() { | ||
| log.Println("Started logging stderr from function.") | ||
| for { | ||
| errBuff := make([]byte, 256) | ||
|
|
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| _, err := errPipe.Read(errBuff) | ||
| if err != nil { | ||
| log.Fatalf("Error reading stderr: %s", err) | ||
|
|
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| } else { | ||
| log.Printf("stderr: %s", errBuff) | ||
| } | ||
| } | ||
| }() | ||
|
|
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| go func() { | ||
| log.Println("Started logging stdout from function.") | ||
| for { | ||
| errBuff := make([]byte, 256) | ||
|
|
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| _, err := f.StdoutPipe.Read(errBuff) | ||
| if err != nil { | ||
| log.Fatalf("Error reading stdout: %s", err) | ||
|
|
||
| } else { | ||
| log.Printf("stdout: %s", errBuff) | ||
| } | ||
| } | ||
| }() | ||
|
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| dialTimeout := 3 * time.Second | ||
| f.Client = makeProxyClient(dialTimeout) | ||
|
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| urlValue, upstreamURLErr := url.Parse(os.Getenv("upstream_url")) | ||
| if upstreamURLErr != nil { | ||
| log.Fatal(upstreamURLErr) | ||
| } | ||
|
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| f.UpstreamURL = urlValue | ||
|
|
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| return cmd.Start() | ||
| } | ||
|
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| // Run a function with a long-running process with a HTTP protocol for communication | ||
| func (f *HTTPFunctionRunner) Run(req FunctionRequest, contentLength int64, r *http.Request, w http.ResponseWriter) error { | ||
|
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| request, _ := http.NewRequest(r.Method, f.UpstreamURL.String(), r.Body) | ||
|
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| res, err := f.Client.Do(request) | ||
|
|
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| if err != nil { | ||
| log.Println(err) | ||
| } | ||
|
|
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| for h := range res.Header { | ||
| w.Header().Set(h, res.Header.Get(h)) | ||
| } | ||
|
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| w.WriteHeader(res.StatusCode) | ||
| if res.Body != nil { | ||
| defer res.Body.Close() | ||
| bodyBytes, bodyErr := ioutil.ReadAll(res.Body) | ||
| if bodyErr != nil { | ||
| log.Println("read body err", bodyErr) | ||
| } | ||
| w.Write(bodyBytes) | ||
| } | ||
|
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| log.Printf("%s %s - %s - ContentLength: %d", r.Method, r.RequestURI, res.Status, res.ContentLength) | ||
|
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| return nil | ||
| } | ||
|
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| func makeProxyClient(dialTimeout time.Duration) *http.Client { | ||
| proxyClient := http.Client{ | ||
| Transport: &http.Transport{ | ||
| Proxy: http.ProxyFromEnvironment, | ||
| DialContext: (&net.Dialer{ | ||
| Timeout: dialTimeout, | ||
| KeepAlive: 1, | ||
| }).DialContext, | ||
| MaxIdleConns: 1, | ||
| DisableKeepAlives: true, | ||
| IdleConnTimeout: 120 * time.Millisecond, | ||
| ExpectContinueTimeout: 1500 * time.Millisecond, | ||
| }, | ||
| } | ||
|
|
||
| return &proxyClient | ||
| } |
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