fix: RPC server unreachable from outside Docker container by g-k-s-03 · Pull Request #145 · StabilityNexus/MiniChain

g-k-s-03 · 2026-09-01T05:59:09Z

Problem

The RPC server was hardcoded to 127.0.0.1 in main.py, while the P2P server correctly accepted a --host override. This meant Docker containers exposed the P2P port fine but the RPC server was unreachable from outside the container, even with -p 8545:8545 passed.

Fixes #141

Changes

Added a --rpc-host CLI argument (default 127.0.0.1) so the RPC server can bind independently of the P2P --host flag
Extracted argument parsing into build_arg_parser() so it's testable without booting the node
rpc_server.start() now uses --rpc-host instead of the hardcoded value
Dockerfile: added EXPOSE 8545 alongside the existing 9000, and the container CMD now passes --rpc-host 0.0.0.0 to match the existing --host 0.0.0.0 P2P binding
Added tests/test_cli_args.py covering default behavior, override behavior, and independence of --host/--rpc-host

Testing

Full test suite passes: 79 passed (verified locally against Python 3.11, matching the CI pipeline's pinned version).

Bare-metal behavior is unchanged — both flags default to 127.0.0.1. Docker now binds RPC on 0.0.0.0:8545, matching the P2P setup.

Summary by CodeRabbit

New Features
- RPC services are now accessible on port 8545 and bind to all network interfaces by default in the Docker image.
Bug Fixes
- Improved consistency between Docker networking configuration and RPC host settings.
Tests
- Added coverage for default and custom RPC host settings, including independent host configuration.

coderabbitai · 2026-09-01T05:59:33Z

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main.py

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Walkthrough

The CLI parser is exposed through build_arg_parser() and tested for independent host options. Docker now exposes port 8545 and binds the RPC service to 0.0.0.0.

Changes

RPC runtime configuration

Layer / File(s)	Summary
Parser and container RPC configuration `main.py`, `tests/test_cli_args.py`, `Dockerfile`	`build_arg_parser()` now owns CLI parser construction. Tests verify independent `--host` and `--rpc-host` values. Docker exposes port `8545` and passes `--rpc-host 0.0.0.0`.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Medium

Suggested labels: Python Lang

Suggested reviewers: siddhantcookie

Merge Risk: ⚪ Minimal · up to 18bf9

The PR preserves loopback defaults and makes Docker RPC reachable on port 8545 as intended.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Issue `#141` requires a configurable RPC bind host, Docker binding on `0.0.0.0`, and declaration of port `8545`. The PR provides `--rpc-host` with default `127.0.0.1`, uses the value for RPC binding, pa…
Out of Scope Changes check	✅ Passed	The Dockerfile changes directly implement Issue `#141`. The parser extraction and CLI tests support the required RPC-host behavior and preserve existing defaults. No unrelated change is established by t…
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the primary change: making the RPC server reachable from outside the Docker container.

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_{I’m a rabbit with ports in a row
The RPC now has room to flow
Parser choices stand clear and bright
Host settings stay separate and right
Port 8545 joins the show}

_{Comment @coderabbitai help to get the list of available commands.}

g-k-s-03 · 2026-09-01T06:04:27Z

@SIDDHANTCOOKIE the "PR Tests & Coverage" check shows as failing, but the actual
test run passed cleanly (79 passed, 0 failures, 0 errors — see the log).
The failure is from the coverage-comment step, which can't post comments
on fork PRs due to GITHUB_TOKEN being read-only in that context. This is
a known limitation of pytest-coverage-comment for fork PRs, unrelated to
this change.

coderabbitai

Actionable comments posted: 1

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Inline comments:
In `@README.md`:
- Line 45: Update the coverage report links in the README coverage section to
use the canonical StabilityNexus/MiniChain repository instead of
g-k-s-03/MiniChain, preserving each existing file and anchor target.

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g-k-s-03 · 2026-09-16T19:27:44Z

Hey @SIDDHANTCOOKIE quick note on this PR.
the "PR Tests & Coverage" check is red only because the coverage-comment step can't post on fork PRs (read-only GITHUB_TOKEN), not a real failure. Already noted this above.
Could you review when you get a chance?

github-actions · 2026-09-22T17:36:41Z

⚠️ This PR has merge conflicts.

Please resolve the merge conflicts before review.

Your PR will only be reviewed by a maintainer after all conflicts have been resolved.

📺 Watch this video to understand why conflicts occur and how to resolve them:
https://www.youtube.com/watch?v=Sqsz1-o7nXk

Resolves conflicts in main.py: upstream independently added --rpc-host plus new P2P flags (--upnp, --bootstrap, --relay, --relay-addr, --announce) via PRs StabilityNexus#143/StabilityNexus#144. Kept the build_arg_parser() extraction from this branch, merged in upstream's fuller run_node/argparse surface, and de-duplicated the two --rpc-host definitions into one (upstream's more descriptive help text).

g-k-s-03 · 2026-09-22T20:50:00Z

@SIDDHANTCOOKIE can you review this pe when you have time

g-k-s-03 and others added 2 commits August 15, 2026 19:08

docs: update coverage badge

728fb1f

fix: add --rpc-host flag so RPC server is reachable outsider

aa92eab

coderabbitai Bot requested changes Sep 1, 2026

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Comment thread README.md Outdated

docs: fix coverage badge link to point to upstream repo

15715fc

github-actions Bot added the PR has merge conflicts label Sep 22, 2026

g-k-s-03 force-pushed the fix/docker-rpc-host branch from 31b8db3 to 96069be Compare September 22, 2026 20:43

github-actions Bot removed the PR has merge conflicts label Sep 22, 2026

g-k-s-03 force-pushed the fix/docker-rpc-host branch from 96069be to 18bf922 Compare September 22, 2026 20:47

coderabbitai Bot approved these changes Sep 22, 2026

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fix: RPC server unreachable from outside Docker container - #145

fix: RPC server unreachable from outside Docker container#145
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g-k-s-03:fix/docker-rpc-host

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