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async_hooks: only set up hooks if used #13177

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async_hooks: only set up hooks if used #13177

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17 changes: 11 additions & 6 deletions lib/async_hooks.js
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Original file line number Diff line number Diff line change
Expand Up @@ -49,12 +49,7 @@ const before_symbol = Symbol('before');
const after_symbol = Symbol('after');
const destroy_symbol = Symbol('destroy');

// Setup the callbacks that node::AsyncWrap will call when there are hooks to
// process. They use the same functions as the JS embedder API.
async_wrap.setupHooks({ init,
before: emitBeforeN,
after: emitAfterN,
destroy: emitDestroyN });
let setupHooksCalled = false;

// Used to fatally abort the process if a callback throws.
function fatalError(e) {
Expand Down Expand Up @@ -103,6 +98,16 @@ class AsyncHook {
if (hooks_array.includes(this))
return;

if (!setupHooksCalled) {
setupHooksCalled = true;
// Setup the callbacks that node::AsyncWrap will call when there are
// hooks to process. They use the same functions as the JS embedder API.
async_wrap.setupHooks({ init,
before: emitBeforeN,
after: emitAfterN,
destroy: emitDestroyN });
}

// createHook() has already enforced that the callbacks are all functions,
// so here simply increment the count of whether each callbacks exists or
// not.
Expand Down