raunioroo
raunioroo
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DDeno
Created by Bhaumin on 3/25/2025 in #help
about prod & dev dependencies in deno projects
sorry but save the thanks, I'm not super keen on doing that kind of legwork :)
10 replies
DDeno
Created by Bhaumin on 3/25/2025 in #help
about prod & dev dependencies in deno projects
You can do that sure OR have a separate entry point for dev stuff. Then all dependencies can live in one import map. I personally prefer the latter approach. As marvinh said, those import map dependencies are only defined in the import map - they are not automatically used or loaded so defining stuff there is "free". They are actually loaded only if your entry point specifically needs (imports) it. So if your prod entry point does not import dev stuff, none of the dev stuff is loaded.
10 replies
DDeno
Created by Asad on 3/19/2025 in #help
Deno permissions and security
This I don't understand. You can and probably should do ipc via stdout/stdin. Or via files, if you give proper permissions to both processes. Child processes don't inherit permissions of parent, you definitely can specify them separately, and only give the child process access to the files it needs, nothing else.
29 replies
DDeno
Created by Asad on 3/19/2025 in #help
Deno permissions and security
You can't. Unless using web workers which are same process, but different threads. And turns out worker threads can have different permissions. But then, communication between threads (workers and main code) also happens via message passing - which is not that different from what you need to do if you were using child processes. A bit simpler with workers, but the same approach and can be similarly annoying to work with
29 replies
DDeno
Created by Asad on 3/19/2025 in #help
Deno permissions and security
Yeah, I agree doing complex stuff with child processes with message passing is not fun. Can be done and works, but a lot of effort (I even do streaming of files between processes to avoid giving fs access to childs. that was a doozy to implement using json message passing, never again haha... ) Also agree with everything zamfofex said.
29 replies
DDeno
Created by Asad on 3/19/2025 in #help
Deno permissions and security
Reading, I guess there are multiple more or less convoluted ways, but I do it along the lines of this. No promises this works; I hastily made this example by cutting and pasting from a more complex file, and I may have introduced some errors. But maybe it can get you started. TextLineStream is quite handy in breaking child process output to process them line by line as they come. 
import { TextLineStream } from "jsr:@std/streams@1.0.9/text-line-stream";

const stream = childprocess.stdout;

const tls = new TextLineStream();
const tds = new TextDecoderStream();
const reader = stream.pipeThrough(tds).pipeThrough(tls).getReader();

while (true) {
  const { done, value } = await reader.read();
  if (done) {
    break;
  }
  if (value) {
    const data = JSON.parse(value);
    // DO STUFF HERE
  }
}
import { TextLineStream } from "jsr:@std/streams@1.0.9/text-line-stream";

const stream = childprocess.stdout;

const tls = new TextLineStream();
const tds = new TextDecoderStream();
const reader = stream.pipeThrough(tds).pipeThrough(tls).getReader();

while (true) {
  const { done, value } = await reader.read();
  if (done) {
    break;
  }
  if (value) {
    const data = JSON.parse(value);
    // DO STUFF HERE
  }
}
29 replies
DDeno
Created by Asad on 3/19/2025 in #help
Deno permissions and security
Along the lines of 
const writer = childprocess.stdin.getWriter();
...
const json = JSON.stringify({...});
const data = (new TextEncoder()).encode(json + "\n");
writer.write(data);
const writer = childprocess.stdin.getWriter();
...
const json = JSON.stringify({...});
const data = (new TextEncoder()).encode(json + "\n");
writer.write(data);
29 replies
DDeno
Created by Asad on 3/19/2025 in #help
Deno permissions and security
Something like that I guess. Not sure what you mean by ipc proxy, though, it's quite direct cli input/output like any terminal app would do, just that there is no user it's between parent and child process. In main process, create a child process from user code, and keep reading that child process output in a streaming manner. As soon as you encounter a new line, parse the line as JSON, and do stuff based on the JSON message. Child process should of course output JSON that the main process understands (just like, console.log(JSON.stringify(stuff)) ); or whatever). Communication works the other way too; main process can write stuff to the child process, and the child process can read that just like it would read normal user input.
29 replies
DDeno
Created by Asad on 3/19/2025 in #help
Deno permissions and security
I meant that you could do with web workers the same thing that marvinh suggested using child processes. I'm using child processes also for a similar-ish problem, not web workers, but just shared the thought web workers could work too
29 replies
DDeno
Created by Asad on 3/19/2025 in #help
Deno permissions and security
(--unstable-worker-options seems to be the flag to enable overriding worker permissions)
29 replies
DDeno
Created by Asad on 3/19/2025 in #help
Deno permissions and security
Not directly. But you can implement some form of message passing between processes by for example reading and writing JSON lines to/from stdin/stdout. It's a bit involved but works great. Not that different from passing messages between main thread and a web worker. In fact, you should be able to do what @marvinh. suggested using web workers too. That can be slightly more efficient. Web workers inherit the permissions of you main code by default, but looks like you can override that. The manual says specifying permissions in web workers is unstable, idk, have not personally tried that. But look for "Specifying web worker permissions" in https://docs.deno.com/runtime/reference/web_platform_apis/ if interested
29 replies
DDeno
Created by alexp95 on 2/27/2025 in #help
Function as a value?
Maybe im missing something from the question, but.. Functions in javascript are just values like string, number, or any other value. So, store it as is in a class member, just like you would store a string or any other type?
11 replies
DDeno
Created by Inke on 2/18/2025 in #help
how do I access post data in a deno http server?
Well, I remember all this was surprisingly hard/painful to figure out, since there are so many different ways to POST, and all needed to be handled in a different way, wasn't that obvious :)
14 replies
DDeno
Created by Inke on 2/18/2025 in #help
how do I access post data in a deno http server?
...and for detecting which one to use: 
      const contentType = request.headers.get("content-type");
      if (contentType == "application/x-www-form-urlencoded") {
        // url encoded
      } else if (contentType.includes("multipart/form-data")) {
        // multipart
      } else if (contentType == "application/json") {
        // json
      }
      const contentType = request.headers.get("content-type");
      if (contentType == "application/x-www-form-urlencoded") {
        // url encoded
      } else if (contentType.includes("multipart/form-data")) {
        // multipart
      } else if (contentType == "application/json") {
        // json
      }
14 replies
DDeno
Created by Inke on 2/18/2025 in #help
how do I access post data in a deno http server?
For multipart post: 
    const formData = await request.formData();
    const entries = {};
    for (const [key, value] of formData) {
      entries[key] = value;
    }
    return entries;
    const formData = await request.formData();
    const entries = {};
    for (const [key, value] of formData) {
      entries[key] = value;
    }
    return entries;
14 replies
DDeno
Created by Inke on 2/18/2025 in #help
how do I access post data in a deno http server?
For raw json: 
    const postdata = await request.text();
    return JSON.parse(postdata);
    const postdata = await request.text();
    return JSON.parse(postdata);
14 replies
DDeno
Created by Inke on 2/18/2025 in #help
how do I access post data in a deno http server?
For URL encoded post data (like your curl call seems to be), I use this: 
    const postdata = await request.text();
    // console.log("POSTDATA", postdata);
    const searchParams = new URLSearchParams(postdata);
    const post = {};
    for (const [key, value] of searchParams.entries()) {
      // console.log("FOUND", key, value)
      post[key] = value;
    }
    const postdata = await request.text();
    // console.log("POSTDATA", postdata);
    const searchParams = new URLSearchParams(postdata);
    const post = {};
    for (const [key, value] of searchParams.entries()) {
      // console.log("FOUND", key, value)
      post[key] = value;
    }
14 replies
DDeno
Created by Akash on 2/10/2025 in #help
Is it a good idea to use Deno edge functions as a websocket server?
The 50ms limit is pure CPU time; waiting for IO, network and stuff is not counted towards that limit. I don't know if it can be calulated and/or how that applies to longer websocket connections since the limits are "per request" so is over the whole connection time or what. Hopefully someone else with more deploy experience can chime in.
5 replies
DDeno
Created by Akash on 2/10/2025 in #help
Is it a good idea to use Deno edge functions as a websocket server?
Deploy functions are "short lived", so you can't count on them having any particular lifetime. To my knowledge, in practice the typical lifetime is somewhere between minutes up to an hour or so (?). So you need to design your app in a way that it can easily reconnect to another instance, and assume connections are short-lived (or rather "medium-lived" compared to some other edge services). I think it should be doable given those limitations.
5 replies
DDeno
Created by raunioroo on 2/26/2024 in #help
Deny env permissions silently (without throwing)
nice! good to know I can now remove the hairy workarounds!
9 replies