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author | Ali Ijaz Sheikh <ofrobots@google.com> | 2018-02-01 15:25:41 -0800 |
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committer | Ali Ijaz Sheikh <ofrobots@google.com> | 2018-02-09 13:03:34 -0800 |
commit | 523a1550a3d07ecc3d13e071cb0f1c732bae3bad (patch) | |
tree | fec47dc679756d17a77b57f67bdaf12ca5275144 /test/parallel/test-async-hooks-recursive-stack-runInAsyncScope.js | |
parent | 0f9efef05deb11dbbdf5adf96460839f5b332207 (diff) | |
download | android-node-v8-523a1550a3d07ecc3d13e071cb0f1c732bae3bad.tar.gz android-node-v8-523a1550a3d07ecc3d13e071cb0f1c732bae3bad.tar.bz2 android-node-v8-523a1550a3d07ecc3d13e071cb0f1c732bae3bad.zip |
async_hooks: deprecate unsafe emit{Before,After}
The emit{Before,After} APIs in AsyncResource are problematic.
* emit{Before,After} are named to suggest that the only thing they do
is emit the before and after hooks. However, they in fact, mutate
the current execution context.
* They must be properly nested. Failure to do so by user code leads
to catastrophic (unrecoverable) exceptions. It is very easy for the
users to forget that they must be using a try/finally block around
the code that must be surrounded by these operations. Even the
example provided in the official docs makes this mistake. Failing
to use a finally can lead to a catastrophic crash if the callback
ends up throwing.
This change provides a safer `runInAsyncScope` API as an alternative
and deprecates emit{Before,After}.
PR-URL: https://github.com/nodejs/node/pull/18513
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Andreas Madsen <amwebdk@gmail.com>
Diffstat (limited to 'test/parallel/test-async-hooks-recursive-stack-runInAsyncScope.js')
-rw-r--r-- | test/parallel/test-async-hooks-recursive-stack-runInAsyncScope.js | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/test/parallel/test-async-hooks-recursive-stack-runInAsyncScope.js b/test/parallel/test-async-hooks-recursive-stack-runInAsyncScope.js new file mode 100644 index 0000000000..bc4ac86e7f --- /dev/null +++ b/test/parallel/test-async-hooks-recursive-stack-runInAsyncScope.js @@ -0,0 +1,20 @@ +'use strict'; +require('../common'); +const assert = require('assert'); +const async_hooks = require('async_hooks'); + +// This test verifies that the async ID stack can grow indefinitely. + +function recurse(n) { + const a = new async_hooks.AsyncResource('foobar'); + a.runInAsyncScope(() => { + assert.strictEqual(a.asyncId(), async_hooks.executionAsyncId()); + assert.strictEqual(a.triggerAsyncId(), async_hooks.triggerAsyncId()); + if (n >= 0) + recurse(n - 1); + assert.strictEqual(a.asyncId(), async_hooks.executionAsyncId()); + assert.strictEqual(a.triggerAsyncId(), async_hooks.triggerAsyncId()); + }); +} + +recurse(1000); |