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rpc: add Client::wait_until_healthy method #855

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merged 1 commit into from
Apr 6, 2021
Merged

rpc: add Client::wait_until_healthy method #855

merged 1 commit into from
Apr 6, 2021

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tony-iqlusion
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Adds a method which repeatedly polls the /health endpoint until it returns a successful response or a specified timeout elapses.

This is useful when writing tests that need to wait for a node to boot up (e.g. inside of a docker container), e.g.:

https://github.com/cosmos/cosmos-rust/pull/71/files#diff-0e31f23fc223d1d543169a682e0f1093c1cc53c6a312febce7d5d1854919fafaR84-R96

@tarcieri tarcieri force-pushed the tony-iqlusion/rpc-wait-until-healthy branch 2 times, most recently from d107113 to c86f077 Compare April 6, 2021 20:50
thanethomson
thanethomson reviewed Apr 6, 2021
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This is a great idea! Have you tested it locally on your side?

rpc/src/client.rs Outdated Show resolved Hide resolved
@tony-iqlusion
rpc: add Client::wait_until_healthy method
2898474 
Adds a method which repeatedly polls the `/health` endpoint until it
returns a successful response or a specified timeout elapses.

This is useful when writing tests that need to wait for a node to boot
up (e.g. inside of a docker container).
@tarcieri tarcieri force-pushed the tony-iqlusion/rpc-wait-until-healthy branch from c86f077 to 2898474 Compare April 6, 2021 21:30
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I updated the PR linked in the description to use code that is now nearly identical to this and it's working as expected locally:

https://github.com/cosmos/cosmos-rust/pull/71/files#diff-0e31f23fc223d1d543169a682e0f1093c1cc53c6a312febce7d5d1854919fafaR97-R117

@thanethomson thanethomson changed the base branch from master to release/v0.19.0 April 6, 2021 22:11
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Awesome. I'd like to include this in the v0.19.0 release. Could you please add this to the CHANGELOG under the IMPROVEMENTS section?

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Actually don't worry about it - I'll add something tomorrow when I finalize the release. It'll be easier that way so we don't have merge conflicts in the changelog.

@thanethomson thanethomson merged commit 2cdab92 into release/v0.19.0 Apr 6, 2021
@thanethomson thanethomson deleted the tony-iqlusion/rpc-wait-until-healthy branch April 6, 2021 23:57
thanethomson added a commit that referenced this pull request Apr 7, 2021
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Add CHANGELOG entry for #855
6040a76 
Signed-off-by: Thane Thomson <connect@thanethomson.com>
thanethomson added a commit that referenced this pull request Apr 7, 2021
@thanethomson @tony-iqlusion
Release v0.19.0 (#854)
2609b60 
* Update changelog for v0.19.0 release

Signed-off-by: Thane Thomson <connect@thanethomson.com>

* Bump versions to v0.19.0

Signed-off-by: Thane Thomson <connect@thanethomson.com>

* Add minor documentation for tendermint-light-client-js crate

Signed-off-by: Thane Thomson <connect@thanethomson.com>

* Add abci and light-client-js crates to release script

Signed-off-by: Thane Thomson <connect@thanethomson.com>

* Add cargo metadata for abci and light-client-js

Signed-off-by: Thane Thomson <connect@thanethomson.com>

* Fix keywords in abci and light-client-js crates

Signed-off-by: Thane Thomson <connect@thanethomson.com>

* rpc: add `Client::wait_until_healthy` method (#855)

Adds a method which repeatedly polls the `/health` endpoint until it
returns a successful response or a specified timeout elapses.

This is useful when writing tests that need to wait for a node to boot
up (e.g. inside of a docker container).

* Temporarily remove RPC query parsing (#858)

Signed-off-by: Thane Thomson <connect@thanethomson.com>

* Add CHANGELOG entry for #855

Signed-off-by: Thane Thomson <connect@thanethomson.com>

Co-authored-by: Tony Arcieri (iqlusion) <tony@iqlusion.io>
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tony-iqlusion commented Apr 7, 2021 •
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I noticed one small problem with this trying to use it.

After updating to tendermint-rpc v0.19, I was still using tcp:// URLs, and even though those were failing to parse, this code waited the full timeout and just said it timed out, making it a bit hard to debug.

Perhaps it should look for certain kinds of errors, i.e. ones relating to the remote node being down, and bubble all others up. Alternatively e.g. HttpClient::new could return a Result and error out eagerly if the URL fails to parse.

Otherwise I switched my code to use it and it's working great!

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After updating to tendermint-rpc v0.19, I was still using tcp:// URLs, and even though those were failing to parse, this code waited the full timeout and just said it timed out, making it a bit hard to debug.

Yes, I think I've just found a small bug in the rpc::Url -> uri::Uri conversion that would cause this to happen when specifying a tcp:// address. I'll open an issue 👍

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