View logs of firebase functions in real time

user_1391483 0
Viewed 22270

I'm using the firebase functions and it's the first time I use node.

My question is very simple, or so I think.

I create a simple function, where, theoretically, if a new field is added to the database, this function must react.

my code is the following:

const functions = require('firebase-functions');


'use strict';


exports.newItem = functions.database.ref('/test')
  .onCreate((snapshot, context) => {


    snapshot = change.after;
    const val = snapshot.val();

    console.log('i´m alive');

    return null;
  })

;

I'm looking for where to see if the log that I have inside the "newItem" function is shown or not.

As I read, I use "firebase functions: log" from the console, but this returns previous logs, not real time.

I have also seen the use of: gcloud functions logs read, as I read here.

But this always returns: -bash: gcloud: command not found I have installed "gcloud functions", but I'm still lost.

I feel if the question is not very well explained, but in summary, I look for a console where to see the logs in real time, just like it does intelij or android studio with the tab logcat.

I would appreciate an explanation for beginners.

Thanks in advance and greetings.

google-cloud-functions firebase node.js logging function
6 Answers

You can see logs in real time using the Firebase console. Choose your project, click the Functions product on the left, then click the Logs tab.

user_8071260

You can also see logs of deployed functions in console/cmd:

Using the Firebase CLI
To view logs with the firebase tool, use the functions:log command:

firebase functions:log

To view logs for a specific function, provide the function name as an argument:

firebase functions:log --only <FUNCTION_NAME>

For the full range of log viewing options, view the help for functions:log:

firebase help functions:log

https://firebase.google.com/docs/functions/writing-and-viewing-logs#viewing_logs

user_30732720

For those of us that prefer a CLI version

npx firebase-logging --project=YOUR_PROJECT --freq=1500

This will fetch logs from Firebase, refreshed every 1.5s. Thanks for Geoffery and his answer, for inspiration.

user_730080

The logs are viewable in the Firebase console (Functions -> Logs), but they are very hard to review with details hidden on accordion expansions.

Using the CLI you can specify the numbers of lines to return with the "-n" parameter:

firebase functions:log -n 100

You can also simulate real time logs by continually getting the logs and printing out the new entries.

https://github.com/fireRun-io/firebase-logging

const cmd = require("node-cmd");
const argv = require("yargs").argv;

let last = [];
const project = argv.project ? `--project ${argv.project}` : "";
const lines = argv.lines ? argv.lines : 100;

if (argv.h) {
  console.log(
    "Format: node firebase-logging.js --project=[projectId] --n=[number of lines]"
  );
  return;
}

const getLogs = () => {
  cmd.get(
    `firebase ${project} functions:log -n ${lines}`,
    (err, data, stderr) => {
      if (err) {
        console.error(err);
      }

      const splitData = data.trim().split("\n");
      const diff = splitData.filter((x) => !last.includes(x));

      if (diff.length > 0) {
        console.log(diff.join("\n"));
      }

      last = [...splitData];
    }
  );
};

getLogs();
setInterval(() => {
  getLogs();
}, 2000);
user_77119680
user_11989200
user_74816630
Related