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feat(pluginkit): recover a panic in a plugin's route and read each plugin's routes on its own - #150
Protect takes the plugin's id and a RouteSettings value: Protect(id, handler, publicPaths, settings). RouteSettings holds the application's middleware as Wrap, the answer to a panic as Answer, and Report. This is a breaking change for every caller of Protect.
A panic in the plugin's handler is caught, on a public path and behind the middleware alike. While nothing of the answer went out, the headers the plugin set are dropped, values it changed in place included, and Answer writes the answer. Once the plugin or the middleware had begun the answer, the recover panics again with http.ErrAbortHandler, so the server cuts the connection and a half answer never looks complete.
Protect refuses an empty id, a nil Wrap, Answer or Report, and a Wrap that answers no handler, with a panic that names it.
Report receives a RouteFailure for each panic: the id, the method, the path the handler saw, whether Answer wrote the answer, the text pluginkit: feed route panicked: boom and the stack.
A connection the handler hijacked is closed after a panic. A handler that panics with http.ErrAbortHandler is left to the server and reported to no one. Flush, Hijack and http.ResponseController reach the server's writer through the wrapped one.
A panic in the application's own middleware is never blamed on the plugin, as the recover sits inside Wrap.
RoutesEach reads each plugin's routes and public paths inside a recover. It answers them, plus a Failure at the new StepRoutes for each plugin whose Routes or PublicPaths panics, or whose Routes answers no handler, so an application can pause that plugin before it starts.
Why
A panic in a plugin's handler reached net/http, which logs it with no plugin id and drops the connection, so the client got no answer at all. The routes were also read with no recover, so one plugin whose Routes panicked stopped the application before it served.
Testing
routes.feature adds 33 scenarios over real servers on HTTP/1 and HTTP/2, with clients that never reuse a connection: an answer before and after the plugin began its own, a middleware that began the answer, the plugin's headers kept off the answer, a 103, a hijack, an abort, the response controller, a nil handler, a public path, a panic in the middleware, the refused settings and RoutesEach.
Unit tests cover a 101 over HTTP/1 and HTTP/2, a status the server refuses, a header value changed in place, a middleware that began the answer through a writer that hides the server's, a plugin that panics after http.TimeoutHandler answered for it, run under race, a failed hijack, the read deadline and a writer that cannot flush. pluginkit, pluginstoretest and wire keep 100% coverage, and the 111 scenarios pass under race.
BenchmarkProtectServesARoute measures the recover and the writer it hands the middleware at about 330 ns, 496 bytes and 6 allocations per request.
golangci-lint reports nothing on pluginkit and its features.
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Commits
Reviewing files that changed from the base of the PR and between 3f75fb3 and e42ac5d.
Files selected for processing: 7
pluginkit/features/routes.feature
pluginkit/features/steps_routes_test.go
pluginkit/protect.go
pluginkit/protect_test.go
pluginkit/recover.go
pluginkit/recover_test.go
pluginkit/routes_test.go
Walkthrough
The PR changes Protect to accept plugin identity and route settings, adds panic recovery and reporting for plugin handlers, and adds RoutesEach to collect plugin routes while recording per-plugin loading failures. It also adds tests for HTTP response behavior and route loading.
Changes: Plugin route handling
Layer / File(s)
Summary
Protect settings and middleware pluginkit/protect.go, pluginkit/protect_test.go
Protect now accepts a plugin ID and RouteSettings. It validates the required values, bypasses middleware for exact public-path matches, and tests middleware setup and validation.
The recovered handler reports plugin panics and serves the configured answer if the response has not begun. If the response has begun, it aborts. The wrapped writer tracks response status, writes, flushes, and hijacking.
RoutesEach collects handlers and public paths. It removes a plugin’s entries and records a StepRoutes failure if route loading panics or a route handler is nil.
Route scenarios and documentation pluginkit/features/*, pluginkit/CHANGELOG.md
The feature suite and test harness cover protected routes, response behavior over HTTP/1 and HTTP/2, and route-loading outcomes. The changelog records the API and behavior changes.
sequenceDiagram
participant PluginHandler
participant recovered
participant RouteSettingsReport
participant RouteSettingsAnswer
participant HTTPServer
recovered->>PluginHandler: invoke handler
PluginHandler-->>recovered: panic
recovered->>RouteSettingsReport: report RouteFailure
alt response has not begun
recovered->>RouteSettingsAnswer: serve configured answer
else response has begun
recovered->>HTTPServer: raise http.ErrAbortHandler
end
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Possibly related PRs
gopherium/framework#127: Defines the Failure, Step, and guarded contracts used by RoutesEach.
Suggested reviewers:codescene-access
Merge Risk: Low · previous review 3f75f
A misconfigured Wrap that returns nil is not caught when Protect is called. It then fails on each non-public request. This is a narrow misconfiguration case and a small fix; the rest of the change looks sound.
Pre-merge checks: 4 · 1
Failed checks: 1 warning
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Explanation
Resolution
Docstring Coverage
Docstring coverage is 19.23% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta…
Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed checks: 4 passed
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Description Check
Check skipped - CodeRabbit’s high-level summary is enabled.
Title check
The title names the two main changes: panic recovery in plugin route handlers and per-plugin route loading via RoutesEach. The changeset matches both: recover.go adds panic recovery for plugin route h…
Linked Issues check
Issue #149 is the only direct linked issue, and it is open. All its coding requirements are met at the reviewed head.
1. Signature and settings [#149]: protect.go defines `RouteSettings{Wrap, Answe…
Out of Scope Changes check
Every changed area maps to an objective in #149. pluginkit/protect.go and pluginkit/recover.go implement the new Protect signature, panic recovery, the RouteFailure report and the wrapped writ…
Full details: Title check
Explanation
The title names the two main changes: panic recovery in plugin route handlers and per-plugin route loading via RoutesEach. The changeset matches both: recover.go adds panic recovery for plugin route handlers, and routes.go adds RoutesEach, which reads each plugin's routes and public paths inside a guarded read. The title omits the breaking Protect signature change, which is expected for a title. The title is one sentence of 93 characters, which is slightly long but readable.
Full details: Linked Issues check
Explanation
Issue #149 is the only direct linked issue, and it is open. All its coding requirements are met at the reviewed head.
Signature and settings [#149]: protect.go defines RouteSettings{Wrap, Answer, Report} and Protect(id, handler, publicPaths, settings). checkRouteSettings rejects an empty id and nil Wrap, Answer or Report.
Panic recovery on public and protected paths [#149]: a public path calls plugin.ServeHTTP directly. Other paths go through settings.Wrap(plugin). recovered.ServeHTTP defers finish, which calls recover(). Both paths therefore recover plugin panics.
Answer before output and cut after output [#149]: finish clears the plugin's headers and restores the headers cloned at entry. It then calls Answer when routeWriter.begun is false. When begun is true, it re-panics with http.ErrAbortHandler. begun is set by status 200 or higher, HTTP/1 101, body writes, a successful hijack, or a flush.
Middleware panics [#149]: Wrap wraps plugin, so a panic in the middleware is raised outside the plugin's recover and is not reported as a plugin failure.
Report payload [#149]: RouteFailure has ID, Method, Path (r.URL.Path), Answered (!begun), Err (text pluginkit: <id> route panicked: <value>) and Stack.
ErrAbortHandler [#149]: finish re-panics http.ErrAbortHandler before any report.
Writer methods [#149]: routeWriter provides Flush, Hijack and Unwrap. Hijack closes the hijacked connection in finish.
Route loading [#149]: routes.goRoutesEach reads each plugin inside guarded under StepRoutes. A Routes that returns nil yields errNoHandler. A failed plugin is removed from both maps and a Failure is appended. start_each.go adds StepRoutes = "routes".
Automated coverage is claimed in the PR description and the feature/unit test summaries (routes.feature, recover_test.go, routes_test.go). I did not execute the tests. The definition of guarded is not in the files I read. Its recover behavior is inferred from its name, its error-returning use and the existing failureOf/panicError pattern, and the route-load panic tests named in the summary cover it.
Full details: Out of Scope Changes check
Explanation
Every changed area maps to an objective in #149. pluginkit/protect.go and pluginkit/recover.go implement the new Protect signature, panic recovery, the RouteFailure report and the wrapped writer. pluginkit/routes.go and the StepRoutes constant in pluginkit/start_each.go implement per-plugin route loading. The *_test.go files and pluginkit/features/routes.feature with steps_routes_test.go provide the tests for these behaviors. features_test.go registers the new feature. pluginkit/CHANGELOG.md records the breaking change for Protect. The pluginkit/recover.go benchmark is a measurement tied to the recover path. No unrelated module, feature or refactoring was identified in the reviewed summary. Changes outside pluginkit were not listed in the summary, so this verdict covers only the summarized files.
Full details: Docstring Coverage
Explanation
Docstring coverage is 19.23% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 26 functions across 9 files. (2 skipped: 2 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Actionable comments posted: 5
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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Inline comments:
Review comments at @pluginkit/features/steps_routes_test.go:
- Around line 640-641: Update the compound checks in failedAt and reportHoldsOne
to compare got against a constructed pluginkit.Failure containing the expected
non-error fields, then validate got.Err and its message in a separate check.
Preserve each helper’s existing expected values and failure behavior.
Review comments at @pluginkit/protect.go:
- Line 25: In Protect, validate the handler returned by settings.Wrap(plugin)
immediately and fail during construction if it is nil, including typed-nil
handlers. Reuse the existing isNil check and follow the established failure
convention used by checkRouteSettings.
Review comments at @pluginkit/recover_test.go:
- Around line 120-140: Split the chained assertions in
TestRecoverAnswersAPanicBeforeTheAnswerBegan into focused helper checks for the
response, headers, and reported failure, preserving every existing condition and
diagnostic. Apply the same approach to other tests in this file that repeat the
len(failures) != 1 checks.
Review comments at @pluginkit/recover.go:
- Line 77: Extract the status condition in routeWriter.WriteHeader into a named
helper on routeWriter to clarify the mixed boolean logic. Preserve the existing
behavior: statuses at or above http.StatusOK begin the answer, while
http.StatusSwitchingProtocols does so only when w.http1 is true.
Review comments at @pluginkit/routes_test.go:
- Around line 104-108: Extract the combined failure comparison in the test into
a small helper, such as failureIs, and call it from the conditional. Preserve
checks for ID, Step, Panicked, and error text so the test continues validating
the same failure fields.
---
Failed pre-merge checks:
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Write docstrings for the functions missing them to satisfy the coverage
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Commits
Reviewing files that changed from the base of the PR and between cc7c0a6 and 3f75fb3.
Files selected for processing: 11
pluginkit/CHANGELOG.md
pluginkit/features/features_test.go
pluginkit/features/routes.feature
pluginkit/features/steps_routes_test.go
pluginkit/protect.go
pluginkit/protect_test.go
pluginkit/recover.go
pluginkit/recover_test.go
pluginkit/routes.go
pluginkit/routes_test.go
pluginkit/start_each.go
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Closes #149
What
Protecttakes the plugin's id and aRouteSettingsvalue:Protect(id, handler, publicPaths, settings).RouteSettingsholds the application's middleware asWrap, the answer to a panic asAnswer, andReport. This is a breaking change for every caller ofProtect.Answerwrites the answer. Once the plugin or the middleware had begun the answer, the recover panics again withhttp.ErrAbortHandler, so the server cuts the connection and a half answer never looks complete.Protectrefuses an empty id, a nilWrap,AnswerorReport, and aWrapthat answers no handler, with a panic that names it.Reportreceives aRouteFailurefor each panic: the id, the method, the path the handler saw, whetherAnswerwrote the answer, the textpluginkit: feed route panicked: boomand the stack.http.ErrAbortHandleris left to the server and reported to no one. Flush, Hijack andhttp.ResponseControllerreach the server's writer through the wrapped one.Wrap.RoutesEachreads each plugin's routes and public paths inside a recover. It answers them, plus aFailureat the newStepRoutesfor each plugin whoseRoutesorPublicPathspanics, or whoseRoutesanswers no handler, so an application can pause that plugin before it starts.Why
A panic in a plugin's handler reached
net/http, which logs it with no plugin id and drops the connection, so the client got no answer at all. The routes were also read with no recover, so one plugin whoseRoutespanicked stopped the application before it served.Testing
routes.featureadds 33 scenarios over real servers on HTTP/1 and HTTP/2, with clients that never reuse a connection: an answer before and after the plugin began its own, a middleware that began the answer, the plugin's headers kept off the answer, a 103, a hijack, an abort, the response controller, a nil handler, a public path, a panic in the middleware, the refused settings andRoutesEach.http.TimeoutHandleranswered for it, run under race, a failed hijack, the read deadline and a writer that cannot flush.pluginkit,pluginstoretestandwirekeep 100% coverage, and the 111 scenarios pass under race.BenchmarkProtectServesARoutemeasures the recover and the writer it hands the middleware at about 330 ns, 496 bytes and 6 allocations per request.golangci-lintreports nothing on pluginkit and its features.