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async_hooks: don't abort unnecessarily
* id values of -1 are allowed. They indicate that the id was never correctly assigned to the async resource. These will appear in any call graph, and will only be apparent to those using the async_hooks module, then reported in an issue. * ids < -1 are still not allowed and will cause the application to exit the process; because there is no scenario where this should ever happen. * Add asyncId range checks to emitAfterScript(). * Fix emitBeforeScript() range checks which should have been || not &&. * Replace errors with entries in internal/errors. * Fix async_hooks tests that check for exceptions to match new internal/errors entries. NOTE: emit{Before,After,Destroy}() must continue to exit the process because in the case of an exception during hook execution the state of the application is unknowable. For example, an exception could cause a memory leak: const id_map = new Map(); before(id) { id_map.set(id, /* data object or similar */); }, after(id) { throw new Error('id never dies!'); id_map.delete(id); } Allowing a recoverable exception may also cause an abort because of a stack check in Environment::AsyncHooks::pop_ids() that verifies the async id and pop'd ids match. This case would be more difficult to debug than if fatalError() (lib/async_hooks.js) was called immediately. try { async_hooks.emitBefore(null, NaN); } catch (e) { } // do something async_hooks.emitAfter(5); It also allows an edge case where emitBefore() could be called twice and not have the pop_ids() CHECK fail: try { async_hooks.emitBefore(5, NaN); } catch (e) { } async_hooks.emitBefore(5); // do something async_hooks.emitAfter(5); There is the option of allowing mismatches in the stack and ignoring the check if no async hooks are enabled, but I don't believe going this far is necessary. PR-URL: #14722 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Refael Ackermann <refack@gmail.com>
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Original file line number | Diff line number | Diff line change |
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@@ -1,15 +1,18 @@ | ||
'use strict'; | ||
require('../common'); | ||
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// This tests that using falsy values in createHook throws an error. | ||
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const common = require('../common'); | ||
const assert = require('assert'); | ||
const async_hooks = require('async_hooks'); | ||
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for (const badArg of [0, 1, false, true, null, 'hello']) { | ||
for (const field of ['init', 'before', 'after', 'destroy']) { | ||
assert.throws(() => { | ||
async_hooks.createHook({ [field]: badArg }); | ||
}, new RegExp(`^TypeError: ${field} must be a function$`)); | ||
}, common.expectsError({ | ||
code: 'ERR_ASYNC_CALLBACK', | ||
type: TypeError, | ||
})); | ||
} | ||
} |