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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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# 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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'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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