Retry initial client connections

[tnull]

I'm not sure what of the behavior really changed since the bitcoind days, but here's yet another thing I stumbled across while trying to making the switch to corepc-node:

Previously, corerpc-node would try to establish a connection via the given Auth cookie, and would panic if it couldn't setup a initial connection. Only the rest of the initial setup steps would be retried with time-delay.

This however was race-y, as the auth cookie might not already be synced to disk on first startup of a fresh bitcoind instance (with fresh data dir), when we try to connect for the first time. Here, we move the intial connection logic into the retry loop to simply also retry it instead of panicking.

@tcharding Seems this might be the last issue (fingers crossed) that keeps LDK and LDK Node from switching our CI over to corepc-node. As the switch is also blocking some features, it would be much appreciated if this could be released soonish after it's reviewed.

[nervana21]

tACK 26ceb4d

Thanks @tnull!

PR tested and reviewed by cloning main (2b410f2), then applying two patches:

failing-tests.patch – adds two tests that fail on main.
pr-111.patch – fixes those failures by adding retry logic implemented in this PR.

Below is the reproduction process (requires sleep and bitcoind in PATH on Unix-like systems):

# 1) Clone the repo and switch to main
git clone https://github.com/rust-bitcoin/corepc.git
cd corepc
git checkout main

# 2) Apply the failing-tests patch (two tests that fail on main)
git apply failing-tests.patch

# 3) Run tests -- these new tests should fail before fix is applied
cargo test --lib test_with_conf_ -- --test-threads=1

# 4) Apply pr-111.patch (the retry logic fix)
git apply pr-111.patch

# 5) Run tests again -- now they pass, after the fix has been applied
cargo test --lib test_with_conf_ -- --test-threads=1

[tcharding]

Mad, thanks man. You'll have to give me a minute please. I'll get to this soon as I can.

[tcharding]

utACK 26ceb4d

[tcharding]

As the switch is also blocking some features, it would be much appreciated if this could be released soonish after it's reviewed.

Sure can. I've got a bunch of patches locally that I might push up first but I'll try and release tomorrow for you. No guarantees though.

[tnull]

As the switch is also blocking some features, it would be much appreciated if this could be released soonish after it's reviewed.

Sure can. I've got a bunch of patches locally that I might push up first but I'll try and release tomorrow for you. No guarantees though.

Thank you!

[tcharding]

Tagged and published.

[tnull]

Tagged and published.

Thanks again! As it was published as a minor release, not a patch, I'm afraid it will need another round of bumping the dependent crates. But I'll open a PR for electrsd at least.

[tnull]

Done: RCasatta/electrsd#100