It also seemed odd to me but makes sense now because throwing an
exception within an error event handler of domain is equivalent to that
of uncaughtException just like
process.on('uncaughtException', function(e) {
console.log(e.message);
throw new Error('bar');
});
throw new Error('foo');
Throwed exception in uncaughtException is not caught in itself.
You can see its reason for a domain case in
https://github.com/joyent/node/blob/master/lib/domain.js#L51-68
One of the workwrounds is to emit an error event explicitly on the
parent domain as
var domain = require('domain');
var topDomain = domain.create();
var subDomain = domain.create();
topDomain.add(subDomain);
topDomain.on("error", function(err) {
console.log("Top saw an error: " + err.message);
});
subDomain.on("error", function(err) {
console.log("Sub saw an error: " + err.message);
if (this.domain) this.domain.emit('error',new Error("bar"));
});
topDomain.run( function() {
subDomain.run(function() {
throw new Error("foo");
});
});
(2012/07/13 6:45), Mike Schilling wrote:
I wrote a simple test of nested domains which looks like this:
var topDomain = domain.create();
var subDomain = domain.create();
topDomain.add(subDomain);
topDomain.on("error", function(err) {
console.log("Top saw an error: " + err.message);
});
subDomain.on("error", function(err) {
console.log("Sub saw an error: " + err.message);
throw new Error("bar")
});
topDomain.run( function() {
subDomain.run(function() {
throw new Error("foo");
});
});
What I was expecting to happen is
1. subDomain catches the first error (foo) and prints a message
2. Since subDomain is a member of topDomain, topDomain catches the
second error (bar), which is thrown from a subDomain event. Now
topDomain prints out a message.
3. Done
4. That is, the output should look like:
Sub saw an error: foo
Top saw an error: bar
That's what happens when I run node under the IntelliJ debugger (no
breakpoints set, just run it to completion.) But if I run node without
the debugger, either under IntelliJ or directly from the command line,
the output is
Sub saw an error: foo
/Users/mike/Documents/workspace-sts-2.9.0.RELEASE/mms/src/js/scripts/testDomains.js:107
throw new Error("bar")
^
Error: bar
at Domain.<anonymous>
(/Users/mike/Documents/workspace-sts-2.9.0.RELEASE/mms/src/js/scripts/testDomains.js:107:11)
at Domain.EventEmitter.emit (events.js:88:17)
at process.uncaughtHandler (domain.js:60:20)
at process.EventEmitter.emit (events.js:115:20)
That is, the first error is caught but not the second one. This
is v0.8.1 on Mac.
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