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fix: panic and worker hang in stream mode when no input is available - #1035
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Walkthrough
ChangesStream input handling
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix · Severity of issue fixed: Medium Suggested reviewers: Merge Risk: ⚪ Minimal · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 20.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 2 files. | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely describes the main change: preventing a panic and worker hang in stream mode when no input is available. Linked Issues check [ #1090] Requirement 1: dnsx -stream must not panic when no input is available. At the reviewed head, InputWorkerStream in internal/runner/runner.go checks for a hosts file, then fileutil.HasStdin(). I…Out of Scope Changes check The reviewed changes are limited to internal/runner/runner.go and internal/runner/runner_test.go, as described in the PR summary. The runner.go change adds the defer close, the no-input error path, an… Full details: Linked Issues check
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Explanation
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#1090] Requirement 1: dnsx -stream must not panic when no input is available. At the reviewed head, InputWorkerStream in internal/runner/runner.go checks for a hosts file, then fileutil.HasStdin(). If neither exists, it logs 'no input provided in stream mode' and returns. The scanner is no longer used while nil, so the nil dereference is removed. Requirement 2: the function must not leave resolve workers blocked when the hosts file cannot be opened. The function now begins with 'defer close(r.workerchan)', so every return path closes the channel, including the os.Open error path. The explicit close at the end of the scan loop was removed, so the channel is closed once. Test coverage: TestRunner_InputWorkerStreamWithoutInput in internal/runner/runner_test.go covers the no-input case (os.Stdin replaced with /dev/null) and the unreadable-hosts-file case (mode 000). Both assert NotPanics and that workerchan is closed. The unreadable-file subtest skips when the file remains readable, for example as root. The existing TestRunner_InputWorkerStream test is unchanged. The whole-PR diff tool was unavailable, so this verdict rests on the reviewed head file contents for runner.go and runner_test.go. The changed-blob diff could not be read. The head contents show the required behavior.
Full details: Out of Scope Changes check
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Explanation
The reviewed changes are limited to internal/runner/runner.go and internal/runner/runner_test.go, as described in the PR summary. The runner.go change adds the defer close, the no-input error path, and removes the trailing close. All of these changes serve
#1090. The runner_test.go change adds the TestRunner_InputWorkerStreamWithoutInput regression test and the path/filepath import it needs. Test coverage for the linked issue is in scope. No unrelated behavior change was identified in the head file contents. The whole-PR diff could not be read with the available tool, so the check relies on the head contents and the PR summary. The 'tighten test' commit message is test-only per the summary and is not a separate scope concern.
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A rabbit checks the stream at dawn
No hosts? It hops safely on
The worker channel closes tight
Tests guard the path all night
Soft paws approve the change just right
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Actionable comments posted: 1
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Inline comments:
In `@internal/runner/runner_test.go`:
- Line 311: Update the unreadable-hosts-file test around InputWorkerStream to
deterministically force the file-open operation to fail instead of relying on
os.Chmod permissions. Inject os.Open or use an equivalent controlled seam, while
preserving the test’s assertion of the error path and worker channel behavior.
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Run ID: 86248d19-1bba-4ced-85a2-bde2df8c9a34
📒 Files selected for processing (2)
internal/runner/runner.gointernal/runner/runner_test.go
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Fixes #1090
Running
dnsx -streamwithout piped stdin (e.g. interactively, or with stdin on/dev/null) panics with a nil pointer dereference inInputWorkerStream, since neither the-lfile nor stdin is present and the scanner is left nil:The same function also returns early on hosts-file open errors without closing
workerchan, leaving the resolve workers blocked forever infor domain := range r.workerchan.This closes the channel via
deferso every exit path unblocks the workers, and reports the missing input instead of panicking. Regression tests cover both the no-input and unreadable-hosts-file paths (TestRunner_InputWorkerStreamWithoutInput).Summary by CodeRabbit