refactor(wrangler): move telemetry events from yargs middleware to command handlers #12055

petebacondarwin · 2026-01-22T18:12:26Z

This refactoring moves the telemetry events (wrangler command started/completed/errored) from the yargs middleware in index.ts to the command handler in register-yargs-command.ts.

Benefits:

Telemetry is now sent after config is loaded, allowing access to send_metrics and hasAssets
Telemetry is only sent for commands that use defineCommand
- pubsub (deprecated/legacy)
- cloudchamber (migrated to use defineCommand)
- containers (migrated to use defineCommand)

Key changes:

Add CommandHandledError wrapper class to signal when telemetry has been sent
Add getErrorType() function to classify errors for telemetry
Send telemetry events in register-yargs-command.ts after config is loaded
Preserve fallback telemetry in index.ts for yargs validation errors
Handle nested wrangler.parse() calls by not double-wrapping CommandHandledError
Properly unwrap CommandHandledError when writing command-failed output

Tests
- Tests included/updated
- Automated tests not possible - manual testing has been completed as follows:
- Additional testing not necessary because:
Public documentation
- Cloudflare docs PR(s):
- Documentation not necessary because: refactoring

A picture of a cute animal (not mandatory, but encouraged)

changeset-bot · 2026-01-22T18:12:30Z

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Latest commit: 7e9344a

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vicb · 2026-01-23T07:08:07Z

Note this second bullet means that command telemetry is no longer sent for "non-Command" commands:

cloudchamber (deprecated/legacy)

pubsub (deprecated/legacy)

containers (need to migrate)

@petebacondarwin could you please create an issue to clean the deprecated stuff and add this to the v5 milestone.

@NuroDev has a PR touching the "non-Command" commands and IMO we should not introduce (convoluted) code for something that is deprecated/going to be removed soon if non criticial.

If I read this correctly, we only need to migrate the containers command to use the command registry to have something cleaner.

pkg-pr-new · 2026-01-23T09:25:42Z

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wrangler

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commit: 7e9344a

devin-ai-integration

Devin Review found 2 potential issues.

View issues and 7 additional flags in Devin Review.

packages/wrangler/src/index.ts

…mmand handlers This refactoring moves the telemetry events (wrangler command started/completed/errored) from the yargs middleware in index.ts to the command handler in register-yargs-command.ts. Benefits: - Telemetry is now sent after config is loaded, allowing access to send_metrics and hasAssets - Telemetry is only sent for commands that use defineCommand Key changes: - Add CommandHandledError wrapper class to signal when telemetry has been sent - Add getErrorType() function to classify errors for telemetry - Send telemetry events in register-yargs-command.ts after config is loaded - Preserve fallback telemetry in index.ts for yargs validation errors - Handle nested wrangler.parse() calls by not double-wrapping CommandHandledError - Properly unwrap CommandHandledError when writing command-failed output

…reateCommand Migrate containers and cloudchamber CLI commands from the legacy yargs defineCommand approach to the new createCommand pattern. This aligns these commands with the updated telemetry handling where events are dispatched directly from command handlers rather than middleware.

…hers Move the requests tracking from per-dispatcher instance to module-level scope so that all dispatchers share the same Set of pending requests. This ensures all metrics requests are awaited before Wrangler exits, regardless of which dispatcher created them. - Add module-level pendingRequests Set with auto-cleanup via .finally() - Export waitForAllMetricsDispatches() to await all pending requests - Remove the per-dispatcher requests getter

devin-ai-integration

Devin Review found 1 new potential issue.

View issue and 9 additional flags in Devin Review.

packages/wrangler/src/cloudchamber/curl.ts

vicb

Thanks Pete!

Looks great for the first pass!

Do you think it is possible to split this PR in 2?

the metrcis
the migration of the commands

If it's easy for an AI maybe we should do that?

I take a quick look at what Devin flagged, some of that should be looked at I think.

I'll do a second (after you look at if the PR can be separated)

vicb · 2026-01-23T15:04:47Z

packages/wrangler/src/__tests__/cloudchamber/create.test.ts

 		);
 		// so testing the actual UI will be harder than expected
 		// TODO: think better on how to test UI actions
-		expect(std.out).toMatchInlineSnapshot(MOCK_DEPLOYMENTS_COMPLEX_RESPONSE);


Doesn't look inline to me 🤔

vicb · 2026-01-23T15:05:52Z

packages/wrangler/src/__tests__/cloudchamber/create.test.ts

+			"
+			 ⛅️ wrangler x.x.x
+			──────────────────
+			{


Before the changes, the output was valid JSON, was that a req?

Good question. I'll find out.

vicb · 2026-01-23T15:07:00Z

packages/wrangler/src/__tests__/cloudchamber/images.test.ts

-			  wrangler cloudchamber registries credentials [domain]  get a temporary password for a specific domain
-			  wrangler cloudchamber registries remove [domain]       removes the registry at the given domain
-			  wrangler cloudchamber registries list                  list registries configured for this account
+			Configure registries via Cloudchamber [alpha]


Is this wanted ?

-> % wrangler r2 wrangler r2 📦 Manage R2 buckets & objects COMMANDS wrangler r2 object Manage R2 objects wrangler r2 bucket Manage R2 buckets wrangler r2 sql Send queries and manage R2 SQL [open-beta]

Perhaps I missed a namespace definition here...

packages/wrangler/src/__tests__/metrics.test.ts

vicb · 2026-01-23T15:09:11Z

packages/wrangler/src/cloudchamber/images/images.ts

 	return Buffer.from(`v1:${credentials.password}`).toString("base64");
 }
+
+// --- New createCommand-based commands ---


vicb · 2026-01-23T15:23:49Z

packages/wrangler/src/core/register-yargs-command.ts

+						throw err;
+					}
+
+					// Send "errored" event


Suggested change

// Send "errored" event

vicb · 2026-01-23T15:26:12Z

packages/wrangler/src/core/register-yargs-command.ts

+				const code =
+					"code" in outputErr ? (outputErr.code as number) : undefined;
+				const message =
+					"message" in outputErr ? (outputErr.message as string) : undefined;
 				writeOutput({
 					type: "command-failed",
 					version: 1,
 					code,
 					message,
 				});


nit: looks weird to use shorthand to write longer code

Suggested change

writeOutput({

type: "command-failed",

version: 1,

code: "code" in outputErr ? (outputErr.code as number) : undefined,

message: "message" in outputErr ? (outputErr.message as string) : undefined,

});

I disagree with this suggestion.
I find it easier to parse logic in creating a variable outside of an object literal.

valid personal pref.
I pref my way because it also clearly tells you that the var is not used elsewhere, easier to parse for me.

But it turns out that we don't need to do any casting for message!

packages/wrangler/src/metrics/metrics-dispatcher.ts

vicb · 2026-01-23T15:30:06Z

packages/wrangler/src/index.ts

+		}

-		const durationMs = Date.now() - startTime;
+		// Fallback telemetry for errors that occurred before handler ran


IMO "Fallback" is more confusing than helping

I'll reword

vicb · 2026-01-23T15:31:58Z

packages/wrangler/src/index.ts

-			"wrangler command completed",
-			{
+			// Send "started" event (since handler never got to send it)
+			dispatcher.sendCommandEvent("wrangler command started", {


Is there any interest in sending a start to send an error right after?

maybe the errorType could be used to flag that instead of sending 2 events.

If there is a actually a need, it would be nice to explain why in a comment.

The telemetry around commands always comes in pairs:

start + completed

start + errored

So this keeps that symmetry and makes reporting on the telemetry simpler.

My question was "why".

Here it makes no sense to send 2 back to back event (on top of that there is a free form errorType)

A "why" could be a limitation of the backend, I think it should be documented.

petebacondarwin · 2026-01-23T15:54:39Z

Thanks Pete!

Looks great for the first pass!

Do you think it is possible to split this PR in 2?

the metrcis

the migration of the commands

If it's easy for an AI maybe we should do that?

I take a quick look at what Devin flagged, some of that should be looked at I think.

I'll do a second (after you look at if the PR can be separated)

@vicb - The PR is made up of 3 commits, which are exactly that separation. Is this enough for you?

petebacondarwin · 2026-01-23T16:02:24Z

packages/wrangler/src/__tests__/cloudchamber/images.test.ts

+			"
+			 ⛅️ wrangler x.x.x
+			──────────────────


Same question about JSON output...

The comments for the PR review were taking from the previous PR (#12055)

devin-ai-integration

Devin Review found 1 new potential issue.

🔴 1 issue in files not directly in the diff

🔴 OpenAPI.BASE cached globally causes containers vs cloudchamber requests to hit the wrong API base after first command (`packages/wrangler/src/cloudchamber/common.ts:182-190`)

fillOpenAPIConfiguration() only sets OpenAPI.BASE when it is currently empty, but the base URL depends on the scope (containers vs cloudchamber).

Actual behavior: if the first command that runs sets OpenAPI.BASE to /accounts/:id/cloudchamber, then later running a containers command will reuse that base and send containers requests to the cloudchamber API prefix (or vice versa).

Expected behavior: OpenAPI.BASE should be configured per-scope (or reset/updated on each call), so that containers calls go to /accounts/:id/containers and cloudchamber calls go to /accounts/:id/cloudchamber.

Impact: commands can make requests to incorrect endpoints, leading to failures or potentially unintended API interactions.

Click to expand

In fillOpenAPIConfiguration(), the base is only set once:

if (OpenAPI.BASE.length === 0) {
  const [base] = await wrap(getAPIUrl(config, accountId, scope));
  OpenAPI.BASE = base;
}

This ignores the scope parameter on subsequent calls. See packages/wrangler/src/cloudchamber/common.ts:182-190.

Recommendation: Make OpenAPI.BASE include the scope in its cache key (e.g., store per-scope base in a map), or always recompute and assign OpenAPI.BASE each time fillOpenAPIConfiguration() is called (and ensure concurrent calls can’t race).

View issue and 12 additional flags in Devin Review.

petebacondarwin added the no-changeset-required label Jan 22, 2026

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vicb mentioned this pull request Jan 23, 2026

Fixed Wrangler invalid command / argument error logging #12050

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petebacondarwin force-pushed the pbd/clean-command-metrics branch from 892be6d to 4f1c154 Compare January 23, 2026 09:22

petebacondarwin force-pushed the pbd/clean-command-metrics branch from 4f1c154 to 3fd5325 Compare January 23, 2026 09:37

petebacondarwin mentioned this pull request Jan 23, 2026

refactor(wrangler): add safe command/args handling for telemetry #12063

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petebacondarwin changed the title ~~WIP: refactor(wrangler): move telemetry events from yargs middleware to command handlers~~ refactor(wrangler): move telemetry events from yargs middleware to command handlers Jan 23, 2026

petebacondarwin marked this pull request as ready for review January 23, 2026 12:08

petebacondarwin requested review from a team as code owners January 23, 2026 12:08

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petebacondarwin added 3 commits January 23, 2026 13:50

petebacondarwin force-pushed the pbd/clean-command-metrics branch from 3fd5325 to 7e9344a Compare January 23, 2026 14:16

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petebacondarwin mentioned this pull request Jan 23, 2026

refactor(wrangler): convert containers and cloudchamber commands to createCommand #12071

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petebacondarwin added a commit that referenced this pull request Jan 23, 2026

fixups after PR review

e0829f5

The comments for the PR review were taking from the previous PR (#12055)

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refactor(wrangler): move telemetry events from yargs middleware to command handlers #12055

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refactor(wrangler): move telemetry events from yargs middleware to command handlers #12055

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🔴 OpenAPI.BASE cached globally causes containers vs cloudchamber requests to hit the wrong API base after first command (packages/wrangler/src/cloudchamber/common.ts:182-190)

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🔴 OpenAPI.BASE cached globally causes containers vs cloudchamber requests to hit the wrong API base after first command (`packages/wrangler/src/cloudchamber/common.ts:182-190`)