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Add options - `stream-stdout-in-response` - `stream-stdout-in-response-on-error` - `stream-command-kill-grace-period-seconds` to allow defining webhooks which dynamically stream large content back to the requestor. This allows the creation of download endpoints from scripts, i.e. running a `git archive` command or a database dump from a docker container, without needing to buffer up the original.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| // Hook Stream is a simple utility for testing Webhook streaming capability. It spawns a TCP server on execution | ||
| // which echos all connections to its stdout until it receives the string EOF. | ||
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| package main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "os" | ||
| "strings" | ||
| "strconv" | ||
| "io" | ||
| "net" | ||
| "bufio" | ||
| ) | ||
|
|
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| func checkPrefix(prefixMap map[string]struct{}, prefix string, arg string) bool { | ||
| if _, found := prefixMap[prefix]; found { | ||
| fmt.Printf("prefix specified more then once: %s", arg) | ||
| os.Exit(-1) | ||
| } | ||
|
|
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| if strings.HasPrefix(arg, prefix) { | ||
| prefixMap[prefix] = struct{}{} | ||
| return true | ||
| } | ||
|
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| return false | ||
| } | ||
|
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| func main() { | ||
| var outputStream io.Writer | ||
| outputStream = os.Stdout | ||
| seenPrefixes := make(map[string]struct{}) | ||
| exit_code := 0 | ||
|
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| for _, arg := range os.Args[1:] { | ||
| if checkPrefix(seenPrefixes, "stream=", arg) { | ||
| switch arg { | ||
| case "stream=stdout": | ||
| outputStream = os.Stdout | ||
| case "stream=stderr": | ||
| outputStream = os.Stderr | ||
| case "stream=both": | ||
| outputStream = io.MultiWriter(os.Stdout, os.Stderr) | ||
| default: | ||
| fmt.Printf("unrecognized stream specification: %s", arg) | ||
| os.Exit(-1) | ||
| } | ||
| } else if checkPrefix(seenPrefixes, "exit=", arg) { | ||
| exit_code_str := arg[5:] | ||
| var err error | ||
| exit_code_conv, err := strconv.Atoi(exit_code_str) | ||
| exit_code = exit_code_conv | ||
| if err != nil { | ||
| fmt.Printf("Exit code %s not an int!", exit_code_str) | ||
| os.Exit(-1) | ||
| } | ||
| } | ||
| } | ||
|
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| l, err := net.Listen("tcp", "localhost:0") | ||
| if err != nil { | ||
| fmt.Printf("Error starting tcp server: %v\n", err) | ||
| os.Exit(-1) | ||
| } | ||
| defer l.Close() | ||
|
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| // Emit the address of the server | ||
| fmt.Printf("%v\n",l.Addr()) | ||
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| manageCh := make(chan struct{}) | ||
|
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| go func() { | ||
| for { | ||
| conn, err := l.Accept() | ||
| if err != nil { | ||
| fmt.Printf("Error accepting connection: %v\n", err) | ||
| os.Exit(-1) | ||
| } | ||
| go handleRequest(manageCh, outputStream, conn) | ||
| } | ||
| }() | ||
|
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| <- manageCh | ||
| l.Close() | ||
|
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| os.Exit(exit_code) | ||
| } | ||
|
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| // Handles incoming requests. | ||
| func handleRequest(manageCh chan<- struct{}, w io.Writer, conn net.Conn) { | ||
| defer conn.Close() | ||
| bio := bufio.NewScanner(conn) | ||
| for bio.Scan() { | ||
| if line := strings.TrimSuffix(bio.Text(), "\n"); line == "EOF" { | ||
| // Request program close | ||
| select { | ||
| case manageCh <- struct{}{}: | ||
| // Request sent. | ||
| default: | ||
| // Already closing | ||
| } | ||
| break | ||
| } | ||
| fmt.Fprintf(w, "%s\n", bio.Text()) | ||
| } | ||
| } |
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