How to get progress of a download

[webchaz]

I started with the example provided here for node: https://github.com/feross/webtorrent/blob/master/examples/browser-download.js

I can't see a way to get the download progress (speed, percent left, etc.). Is there an event for this?

[webchaz]

In addition, running node v0.10.38, I get a ton of:

(node) warning: Recursive process.nextTick detected. This will break in the next version of node. Please use setImmediate for recursive deferral.

and then finally:

RangeError: Maximum call stack size exceeded

This is using the same example.

[ericwooley]

We worked on a webtorrent based project over the weekend, and here is the file where we calculated speed and progress.

https://github.com/ericwooley/ship-it-wt/blob/master/app/src/js/src/ui/download-stats/download-stats.js

It's also really helpful to look through the instant.io source code to find a lot of these things.

[feross]

@webchaz The node warning you're seeing is a node 0.10 bug. If you upgrade to node 0.12 or iojs, the warning should go away. See: nodejs/node-v0.x-archive#6065

@ericwooley's advice is right. For now, it's really useful to look at the code for https://instant.io to learn how to do various things. Please send PRs to improve the docs, if you find things that aren't documented.

Specifically, here's how to get download progress: https://github.com/feross/instant.io/blob/0bfc78b401ae39bcd3352c8c7cb6f5d5c1bc5e0b/client/index.js#L144

[ericwooley]

@feross Are you open to a PR on torrent-swarm the torrent object to implement a getProgress / getSpeed type method?

[webchaz]

@feross @ericwooley Thanks for the links and info, this was exactly what I was looking for.

[feross]

@ericwooley

I'd accept a PR to add torrent.downloadSpeed() and torrent.uploadSpeed() which would just call torrent.swarm.downloadSpeed() and torrent.swarm.uploadSpeed().

torrent.progress is already implemented: https://github.com/feross/webtorrent/blob/master/lib/torrent.js#L99-L103

[ericwooley]

@feross I didn't notice the swarm speeds were implemented. That makes things easy!