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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 |
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// 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 | ||
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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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