Kay•13mo ago

Log Deno.command process output

i need to execute a command wich will keep running until stopped and log the output. i found this but it dosnt work

const command = new Deno.Command(
  "java",
  {
    args: [
      "-Xms512M",
      "-Xmx512M",
      "-XX:+UseG1GC",
      "-XX:G1HeapRegionSize=4M",
      "-XX:+UnlockExperimentalVMOptions",
      "-XX:+ParallelRefProcEnabled",
      "-XX:+AlwaysPreTouch",
      "-jar",
      "proxy.jar"
    ],
    stdout: "piped",
    stdin: "piped",
    stderr: "piped",
  },
);
const process = command.spawn();
for await (const line of readLines(process.stdout)) {
    emit_console_out(line);
}

const command = new Deno.Command(
  "java",
  {
    args: [
      "-Xms512M",
      "-Xmx512M",
      "-XX:+UseG1GC",
      "-XX:G1HeapRegionSize=4M",
      "-XX:+UnlockExperimentalVMOptions",
      "-XX:+ParallelRefProcEnabled",
      "-XX:+AlwaysPreTouch",
      "-jar",
      "proxy.jar"
    ],
    stdout: "piped",
    stdin: "piped",
    stderr: "piped",
  },
);
const process = command.spawn();
for await (const line of readLines(process.stdout)) {
    emit_console_out(line);
}

this says:

Argument of type 'ReadableStream<Uint8Array>' is not assignable to parameter of type 'Reader'. Property 'read' is missing in type 'ReadableStream<Uint8Array>' but required in type 'Reader'

and i know that process.stdout has a getReader but that dosnt seem to work either

3 Replies

SyrupThinker•13mo ago

You could use https://deno.land/std@0.195.0/streams/mod.ts?s=TextLineStream for directly using the ReadableStream. Alternatively you could use https://deno.land/std@0.195.0/streams/mod.ts?s=readerFromStreamReader to create a Reader compatible with readLines.

Kay•13mo ago

alr thx il look into that

wobsoriano•11mo ago

hey @kaytitulaer3820, do you have an example of how you converted this code with new functions?

for await (const line of readLines(process.stdout)) {
    emit_console_out(line);
}

for await (const line of readLines(process.stdout)) {
    emit_console_out(line);
}

I tried this but it exits immediately

this._process = new Deno.Command(Deno.execPath(), {
  args: cmd,
  stdin: 'piped',
  stderr: 'piped',
  stdout: 'piped',
})

const child = this._process.spawn();

const stdout = readerFromStreamReader(child.stdout.getReader());
const stderr = readerFromStreamReader(child.stderr.getReader());
for await (const line of readLines(stdout)) {
  if (line.trim()) this.emit('data', line);
}

// exits

this._process = new Deno.Command(Deno.execPath(), {
  args: cmd,
  stdin: 'piped',
  stderr: 'piped',
  stdout: 'piped',
})

const child = this._process.spawn();

const stdout = readerFromStreamReader(child.stdout.getReader());
const stderr = readerFromStreamReader(child.stderr.getReader());
for await (const line of readLines(stdout)) {
  if (line.trim()) this.emit('data', line);
}

// exits