Go-ethereum: Support for events in Go bindings

Created on 8 Jul 2016 · 18Comments · Source: ethereum/go-ethereum

It would be great to have support for events in the Go bindings to easily watch needed events.

In the docs it is only mentioned it is waiting for some RPC pub/sub changes but maybe these are already available?

Is this feature being worked on or discussed?

I am aware it is possible to get logs and thus events either with polling or subscription over JSON RPC.

Source

murrekatt

👍23

Most helpful comment

Is this expected to be out in ~1.6.6~ ~1.6.7~ 1.6.8? We're multiple versions ahead of the target milestone of this issue.

coreyog on 20 Jun 2017

👍7

All 18 comments

It's waiting for a new RPC client implementation from @fjl . When that is merged in, we can properly use subscriptions to get the event logs and I can finally implement this for Native DApps :)

karalabe on 12 Jul 2016

@karalabe @fjl any schedule for this or place to follow/discuss the work?

murrekatt on 18 Jul 2016

The RPC client is currently in review, see #2808. We are also reworking filter system internals to provide
a uniform API for subscriptions (in #2798).

When those two are in, the abigen backend package will need to be updated with subscription support.
This won't be much work. If everything goes well, I'd say you have to wait two more weeks.

fjl on 18 Jul 2016

See #2900

fjl on 17 Aug 2016

I see

#2900 was closed, and apparently not replaced.
#2798 was closed in favour of #2885 and merged.
#2808 was merged.

What remains? Just abigen updates? I don't see an abigen issue addressing events (other than this one).

johnweldon on 15 Sep 2016

This issue is still open, the work is not done yet. @awishformore told me he is still working on this. If he isn't, me or @karalabe will step in and do it. Either way this is part of the 1.5 milestone and we all want it, so it'll happen.

fjl on 16 Sep 2016

❤1

I will start working on this again this weekend. Had a couple of rough weeks.

awfm9 on 21 Sep 2016

Any updates about this PR? We really need this feature! Thanks.

markya0616 on 20 Jan 2017

I dropped the ball on this one, just couldn't find the time anymore. Not sure on the current status.

awfm9 on 22 Jan 2017

@karalabe, @fjl
Any update about this feature?
Not sure if there is something I can do but I'm willing to help this.

alanchchen on 25 Jan 2017

Is this expected to be out in ~1.6.6~ ~1.6.7~ 1.6.8? We're multiple versions ahead of the target milestone of this issue.

coreyog on 20 Jun 2017

👍7

Is there any workaround for this? How can I get the events in Go without waiting for this release?

robert-zaremba on 4 Sep 2017

Work to add event decoding is going on in ethereum/go-ethereum#14743

fjl on 10 Sep 2017

👍3

@fjl @karalabe what's the status of this? I see 1.7.0 is the milestone and that is already released. Thanks for an update!

murrekatt on 6 Dec 2017

👍1

@fjl @karalabe what's the status of this? Thanks for an update!

lewgun on 9 Feb 2018

It's on master

On Feb 9, 2018 09:35, "lewgun" notifications@github.com wrote:

@fjl https://github.com/fjl @karalabe https://github.com/karalabe
what's the status of this? Thanks for an update!

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karalabe on 9 Feb 2018

🎉3

I just spent a while digging around for docs on this new feature, so in case it's useful to anyone else on this thread, here's a good writeup of the new abigen features for filtering/watching events:

https://github.com/ethereum/go-ethereum/pull/15832

🙏 many thanks @karalabe