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* feat: add debug support through diagnostics channel * refactor: replace old diagnostics with new abstraction * refactor: handle diagnostics simpler * test: move tests to 'right' path * fix: smaller tweaks * refactor: use debuglog instead * docs: add documentation * fix: code review * test: add testing coverage * refactor: remove leftover
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| Original file line number | Diff line number | Diff line change |
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| # Debug | ||
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| Undici (and subsenquently `fetch` and `websocket`) exposes a debug statement that can be enabled by setting `NODE_DEBUG` within the environment. | ||
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| The flags availabile are: | ||
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| ## `undici` | ||
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| This flag enables debug statements for the core undici library. | ||
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| ```sh | ||
| NODE_DEBUG=undici node script.js | ||
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| UNDICI 16241: connecting to nodejs.org using https:h1 | ||
| UNDICI 16241: connecting to nodejs.org using https:h1 | ||
| UNDICI 16241: connected to nodejs.org using https:h1 | ||
| UNDICI 16241: sending request to GET https://nodejs.org// | ||
| UNDICI 16241: received response to GET https://nodejs.org// - HTTP 307 | ||
| UNDICI 16241: connecting to nodejs.org using https:h1 | ||
| UNDICI 16241: trailers received from GET https://nodejs.org// | ||
| UNDICI 16241: connected to nodejs.org using https:h1 | ||
| UNDICI 16241: sending request to GET https://nodejs.org//en | ||
| UNDICI 16241: received response to GET https://nodejs.org//en - HTTP 200 | ||
| UNDICI 16241: trailers received from GET https://nodejs.org//en | ||
| ``` | ||
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| ## `fetch` | ||
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| This flag enables debug statements for the `fetch` API. | ||
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| > **Note**: statements are pretty similar to the ones in the `undici` flag, but scoped to `fetch` | ||
| ```sh | ||
| NODE_DEBUG=fetch node script.js | ||
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| FETCH 16241: connecting to nodejs.org using https:h1 | ||
| FETCH 16241: connecting to nodejs.org using https:h1 | ||
| FETCH 16241: connected to nodejs.org using https:h1 | ||
| FETCH 16241: sending request to GET https://nodejs.org// | ||
| FETCH 16241: received response to GET https://nodejs.org// - HTTP 307 | ||
| FETCH 16241: connecting to nodejs.org using https:h1 | ||
| FETCH 16241: trailers received from GET https://nodejs.org// | ||
| FETCH 16241: connected to nodejs.org using https:h1 | ||
| FETCH 16241: sending request to GET https://nodejs.org//en | ||
| FETCH 16241: received response to GET https://nodejs.org//en - HTTP 200 | ||
| FETCH 16241: trailers received from GET https://nodejs.org//en | ||
| ``` | ||
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| ## `websocket` | ||
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| This flag enables debug statements for the `Websocket` API. | ||
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| > **Note**: statements can overlap with `UNDICI` ones if `undici` or `fetch` flag has been enabled as well. | ||
| ```sh | ||
| NODE_DEBUG=fetch node script.js | ||
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| WEBSOCKET 18309: connecting to echo.websocket.org using https:h1 | ||
| WEBSOCKET 18309: connected to echo.websocket.org using https:h1 | ||
| WEBSOCKET 18309: sending request to GET https://echo.websocket.org// | ||
| WEBSOCKET 18309: connection opened <ip_address> | ||
| ``` |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,202 @@ | ||
| 'use strict' | ||
| const diagnosticsChannel = require('diagnostics_channel') | ||
| const util = require('util') | ||
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| const undiciDebugLog = util.debuglog('undici') | ||
| const fetchDebuglog = util.debuglog('fetch') | ||
| const websocketDebuglog = util.debuglog('websocket') | ||
| let isClientSet = false | ||
| const channels = { | ||
| // Client | ||
| beforeConnect: diagnosticsChannel.channel('undici:client:beforeConnect'), | ||
| connected: diagnosticsChannel.channel('undici:client:connected'), | ||
| connectError: diagnosticsChannel.channel('undici:client:connectError'), | ||
| sendHeaders: diagnosticsChannel.channel('undici:client:sendHeaders'), | ||
| // Request | ||
| create: diagnosticsChannel.channel('undici:request:create'), | ||
| bodySent: diagnosticsChannel.channel('undici:request:bodySent'), | ||
| headers: diagnosticsChannel.channel('undici:request:headers'), | ||
| trailers: diagnosticsChannel.channel('undici:request:trailers'), | ||
| error: diagnosticsChannel.channel('undici:request:error'), | ||
| // WebSocket | ||
| open: diagnosticsChannel.channel('undici:websocket:open'), | ||
| close: diagnosticsChannel.channel('undici:websocket:close'), | ||
| socketError: diagnosticsChannel.channel('undici:websocket:socket_error'), | ||
| ping: diagnosticsChannel.channel('undici:websocket:ping'), | ||
| pong: diagnosticsChannel.channel('undici:websocket:pong') | ||
| } | ||
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| if (undiciDebugLog.enabled || fetchDebuglog.enabled) { | ||
| const debuglog = fetchDebuglog.enabled ? fetchDebuglog : undiciDebugLog | ||
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| // Track all Client events | ||
| diagnosticsChannel.channel('undici:client:beforeConnect').subscribe(evt => { | ||
| const { | ||
| connectParams: { version, protocol, port, host } | ||
| } = evt | ||
| debuglog( | ||
| 'connecting to %s using %s%s', | ||
| `${host}${port ? `:${port}` : ''}`, | ||
| protocol, | ||
| version | ||
| ) | ||
| }) | ||
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| diagnosticsChannel.channel('undici:client:connected').subscribe(evt => { | ||
| const { | ||
| connectParams: { version, protocol, port, host } | ||
| } = evt | ||
| debuglog( | ||
| 'connected to %s using %s%s', | ||
| `${host}${port ? `:${port}` : ''}`, | ||
| protocol, | ||
| version | ||
| ) | ||
| }) | ||
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| diagnosticsChannel.channel('undici:client:connectError').subscribe(evt => { | ||
| const { | ||
| connectParams: { version, protocol, port, host }, | ||
| error | ||
| } = evt | ||
| debuglog( | ||
| 'connection to %s using %s%s errored - %s', | ||
| `${host}${port ? `:${port}` : ''}`, | ||
| protocol, | ||
| version, | ||
| error.message | ||
| ) | ||
| }) | ||
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| diagnosticsChannel.channel('undici:client:sendHeaders').subscribe(evt => { | ||
| const { | ||
| request: { method, path, origin } | ||
| } = evt | ||
| debuglog('sending request to %s %s/%s', method, origin, path) | ||
| }) | ||
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| // Track Request events | ||
| diagnosticsChannel.channel('undici:request:headers').subscribe(evt => { | ||
| const { | ||
| request: { method, path, origin }, | ||
| response: { statusCode } | ||
| } = evt | ||
| debuglog( | ||
| 'received response to %s %s/%s - HTTP %d', | ||
| method, | ||
| origin, | ||
| path, | ||
| statusCode | ||
| ) | ||
| }) | ||
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| diagnosticsChannel.channel('undici:request:trailers').subscribe(evt => { | ||
| const { | ||
| request: { method, path, origin } | ||
| } = evt | ||
| debuglog('trailers received from %s %s/%s', method, origin, path) | ||
| }) | ||
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| diagnosticsChannel.channel('undici:request:error').subscribe(evt => { | ||
| const { | ||
| request: { method, path, origin }, | ||
| error | ||
| } = evt | ||
| debuglog( | ||
| 'request to %s %s/%s errored - %s', | ||
| method, | ||
| origin, | ||
| path, | ||
| error.message | ||
| ) | ||
| }) | ||
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| isClientSet = true | ||
| } | ||
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| if (websocketDebuglog.enabled) { | ||
| if (!isClientSet) { | ||
| const debuglog = undiciDebugLog.enabled ? undiciDebugLog : websocketDebuglog | ||
| diagnosticsChannel.channel('undici:client:beforeConnect').subscribe(evt => { | ||
| const { | ||
| connectParams: { version, protocol, port, host } | ||
| } = evt | ||
| debuglog( | ||
| 'connecting to %s%s using %s%s', | ||
| host, | ||
| port ? `:${port}` : '', | ||
| protocol, | ||
| version | ||
| ) | ||
| }) | ||
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| diagnosticsChannel.channel('undici:client:connected').subscribe(evt => { | ||
| const { | ||
| connectParams: { version, protocol, port, host } | ||
| } = evt | ||
| debuglog( | ||
| 'connected to %s%s using %s%s', | ||
| host, | ||
| port ? `:${port}` : '', | ||
| protocol, | ||
| version | ||
| ) | ||
| }) | ||
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| diagnosticsChannel.channel('undici:client:connectError').subscribe(evt => { | ||
| const { | ||
| connectParams: { version, protocol, port, host }, | ||
| error | ||
| } = evt | ||
| debuglog( | ||
| 'connection to %s%s using %s%s errored - %s', | ||
| host, | ||
| port ? `:${port}` : '', | ||
| protocol, | ||
| version, | ||
| error.message | ||
| ) | ||
| }) | ||
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| diagnosticsChannel.channel('undici:client:sendHeaders').subscribe(evt => { | ||
| const { | ||
| request: { method, path, origin } | ||
| } = evt | ||
| debuglog('sending request to %s %s/%s', method, origin, path) | ||
| }) | ||
| } | ||
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| // Track all WebSocket events | ||
| diagnosticsChannel.channel('undici:websocket:open').subscribe(evt => { | ||
| const { | ||
| address: { address, port } | ||
| } = evt | ||
| websocketDebuglog('connection opened %s%s', address, port ? `:${port}` : '') | ||
| }) | ||
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| diagnosticsChannel.channel('undici:websocket:close').subscribe(evt => { | ||
| const { websocket, code, reason } = evt | ||
| websocketDebuglog( | ||
| 'closed connection to %s - %s %s', | ||
| websocket.url, | ||
| code, | ||
| reason | ||
| ) | ||
| }) | ||
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| diagnosticsChannel.channel('undici:websocket:socket_error').subscribe(err => { | ||
| websocketDebuglog('connection errored - %s', err.message) | ||
| }) | ||
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| diagnosticsChannel.channel('undici:websocket:ping').subscribe(evt => { | ||
| websocketDebuglog('ping received') | ||
| }) | ||
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| diagnosticsChannel.channel('undici:websocket:pong').subscribe(evt => { | ||
| websocketDebuglog('pong received') | ||
| }) | ||
| } | ||
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| module.exports = { | ||
| channels | ||
| } |
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