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[Integration/v2] pubsub: fix v2 re-export gaps and complete the migration guide - #718
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ablyAgentIdentifier ranged over the agents map, so the order of the products in the Ably-Agent header changed from one request to the next. Every client built by server/pubsub or device/pubsub now carries at least one extra agent, and two or more once the user passes WithAgents, so the order was observable on every request. The same function builds the header for HTTP requests and for the WebSocket handshake. Sort the products by name. The entry-point tests can now assert the exact header instead of falling back to strings.Contains, and they also check the SDK family and side identifiers as literal strings, since those are what Ably's traffic classification keys on and a test that derives its expectation from the same constants cannot catch a change to them.
The entry points aliased the LiveObjects enum types but not their values, so a plugin author could not name objects.Operation_MapSet or objects.Map_LWW and had to write ObjectsOperationAction(1). Re-export the seven constants with the Objects prefix and without the underscore, as ObjectsOperationMapSet and ObjectsMapLWW, in both entry points. The re-exports are written by hand, and nothing noticed when internal/ably gained a name an entry point did not re-export. Add reexport_test.go: it fails when internal/ably exports a name that server/pubsub does not re-export, or that device/pubsub neither re-exports nor lists as reachable only from an HTTP client. Names left out on purpose are listed with the reason, so an omission is a recorded decision rather than an oversight. ErrChannelReleaseInvalidState is one of them: callers compare ErrorInfo.Code against 90011. Also fix the doc comments the move to the entry points left stale: links to [Realtime], which neither package declares, and to [HTTPChannel] and [HTTPClient] in device/pubsub, which has neither; references to an "[ably] Pagination" package section users cannot see; a pointer to ably-go/ably/objects/liveobjects.go; and REST wording that named the old client type. Give ChannelEventEmitter and ChannelProperties real doc comments, and document the forms WithEndpoint accepts, including that "localhost:8080" is not a hostname.
The guide's rename tables and closing sentence used the ably package, which users can no longer import, and the device example passed an API key to an end-user client. The guide also no longer said that github.com/ably/ably-go/ably is gone, and it did not mention several changes already on this branch. Rewrite the rename tables and examples against server/pubsub, use token authentication in the device examples of both the guide and the README, complete the list of what the device entry point leaves out, and document the LiveObjects constants. Add sections for the Channels.Release change (no context, error 90011 unless detached), the ably-pubsub-go and side identifiers in the Ably-Agent header, WithAgents merging instead of replacing, the HTTPClient log prefix and the move of examples/rest to examples/http. The README and guide install commands now name an entry-point package, since the module root has no package of its own.
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WalkthroughThe pull request updates server and device pubsub API documentation, adds LiveObjects constants, sorts agent identifiers, and expands package usage and export guidance. ChangesPubsub API and package guidance
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Suggested reviewers: Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 70.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 20 functions across 6 files. (2 skipped: … | 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. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Title check The title accurately identifies the main changes: fixing v2 re-export gaps and completing the migration guide. It is specific and concise.
Full details: Docstring Coverage
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Docstring coverage is 70.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 20 functions across 6 files. (2 skipped: 2 unsupported.)
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Write docstrings for the functions missing them to satisfy the coverage threshold.
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Review comments at @README.md:
- Around line 61-62: Update the README statement around the entry-point
examples, and the corresponding statement in UPDATING.md, to clarify that
switching entry points may require code changes: common operations have similar
call sites, but constructors such as NewRealtimeClient versus NewClient and
HTTP-only APIs differ.
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README.mdUPDATING.mddevice/pubsub/api.godevice/pubsub/device_test.gointernal/ably/proto_http.goserver/pubsub/api.goserver/pubsub/reexport_test.goserver/pubsub/server_test.go
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Summary
Follow-up to the review of #712. This PR fixes the gaps in the v2 entry points and migration guide that don't depend on any open design decision. It doesn't change the SDK's behaviour, apart from making the
Ably-Agentheader order deterministic.internal/ablygains an export that an entry point forgets.UPDATING.mdand the README now compile, use token auth on devices, and cover every user-visible change already onintegration/v2.Base:
integration/v2. 3 commits, 8 files, +383 / −88, about 40 lines of which are production code. The rest is tests, doc comments and docs.Changes
1.
ably: sort the Ably-Agent products so the header is deterministicinternal/ably/proto_http.goablyAgentIdentifiersorts the agent products before joining them. It used to range over a map, so the order changed between requests. The same function builds the header for HTTP and for the WebSocket handshake.server/pubsub/server_test.go,device/pubsub/device_test.goably-pubsub-go/) and side (ably-pubsub-server,ably-pubsub-device) identifiers as literal strings. The existing assertions derive their expectation from the same constants, so they can't catch a change to them. The merge test now asserts the exact order instead of usingstrings.Contains.2.
pubsub: re-export the LiveObjects constants and test the re-exportsWhy the LiveObjects constants were missing
main(v1)github.com/ably/ably-go/ably/objects, a public packageobjects.Operation_MapSet,objects.Map_LWW, …integration/v2before this PRinternal/ably/objects, which other modules cannot import. Only re-exports fromserver/pubsubanddevice/pubsubare reachable.ObjectsOperationAction,ObjectsMapSemantics) were re-exported, but their values were not.ObjectsOperationMapCreate…ObjectsOperationDeleteandObjectsMapLWWSo this was a regression in the split, not a deliberate removal. It matters because the LiveObjects plugin isn't part of the SDK: an application supplies it through
WithExperimentalObjectsPluginand buildsObjectsMessagevalues itself, which needs these values. Ably's own services that implement the plugin use them today, for example to setAction: objects.Operation_MapCreateandSemantics: objects.Map_LWW. Without the re-exports, those callers could only writepubsub.ObjectsOperationAction(0)after upgrading.Naming follows the existing
Objectsprefix for LiveObjects names, minus the underscore:ably/objects)server/pubsub,device/pubsub)objects.Operation_MapCreatepubsub.ObjectsOperationMapCreateobjects.Operation_MapSetpubsub.ObjectsOperationMapSetobjects.Operation_MapRemovepubsub.ObjectsOperationMapRemoveobjects.Operation_CounterCreatepubsub.ObjectsOperationCounterCreateobjects.Operation_CounterIncpubsub.ObjectsOperationCounterIncobjects.Operation_Deletepubsub.ObjectsOperationDeleteobjects.Map_LWWpubsub.ObjectsMapLWWWhy add a re-export test
The re-exports are written by hand. Before this PR, nothing failed when
internal/ablyexported a name that an entry point didn't re-export. That's how the constants above went missing, with CI green. The existing tests can't catch it: 36 test files importinternal/ablydirectly, and the tests that import the public packages touch only 26–28 of the 303 re-exported names.reexport_test.gocloses that gap. It parses both entry points andinternal/ably, needs no generator and no new dependencies, and fails with a message naming the missing export. I checked it fails when one re-export is removed from either package.Files
server/pubsub/api.go,device/pubsub/api.goserver/pubsub/reexport_test.go(new)internal/ablyexports a name thatserver/pubsubdoesn't re-export, or thatdevice/pubsubneither re-exports nor lists as HTTP-only. Every deliberate omission is listed with its reason (table below).api.gofiles[Realtime]→[RealtimeClient]/[Client]; device links to[HTTPChannel]/[HTTPClient]removed; dangling "[ably]Pagination" references now point to[PaginatedResult]; theably-go/ably/objects/liveobjects.gopointer now points to[ObjectsPlugin]; REST wording that named the old client type is updated; real doc comments forChannelEventEmitterandChannelProperties;WithEndpointdocuments the forms it accepts.Names left out on purpose, as recorded in the test:
Realtime,NewRealtimeRealtimeClient/NewRealtimeClient(server) andClient/NewClient(device), which add the side agentWithDialErrChannelReleaseInvalidStateErrorInfo.Codeagainst900113.
docs: complete the v2 migration guideUPDATING.md-droprequiredoesn't rewrite importsgithub.com/ably/ably-go/ablyno longer exists; the device example usesWithAuthURL+WithClientIDinstead of an API key; complete list of whatdeviceleaves out, and what it keepsREST→HTTPpubsub.instead of the unimportableably.; headings nested correctlyChannels.Releasectx; returns error90011unless the channel isINITIALIZED/DETACHED/FAILED; before/after exampleably-pubsub-go/<version>plus the side identifier;WithAgentsnow merges; alphabetical orderHTTPClient:log prefix;examples/rest→examples/httpREADME: install command, device snippet with token auth, and the "both packages are named
pubsub" paragraph moved after the table it was splitting from its lead-in.Review feedback addressed
ably.WithAgentsdocs and header order, agent testsNot in this PR
These depend on decisions still open in the #712 review, or are handled separately:
/v2suffix vs av1.xtag): awaiting decision.Validation
All run locally on this branch:
go build ./...go vet ./...with default,unitandintegrationtagsgofmt -lgo test -tags=unit ./...go test -raceonserver/pubsub,device/pubsuband the agent tests ininternal/ablyTestHTTP_RSC7_AblyAgent,TestRealtime_RSC7_AblyAgent,TestRSC7)go generate ./...leaves the tree cleango build ./examples/...UPDATING.mdand the README, compiled from an external module importing onlyserver/pubsubordevice/pubsubreexport_test.gofails when a re-export is removed (checked by deleting one from each package)Reviewer notes
api.godiffs are mostly doc comments.WithRESTHostrow fromUPDATING.mdthat this PR requalifies, and both touch theWithEndpointarea of theapi.gofiles. Whichever merges second needs a small, mechanical conflict fix.