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feat(scope): better logging of infinite digest error

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Feedback team has often problems debugging inifinite digest errors, this change
should reveal info about what watchers are causing the infinite loop
This commit is contained in:
Igor Minar
2011-10-30 15:11:25 -07:00
parent 615841a5d3
commit ef875ad0cf
2 changed files with 38 additions and 7 deletions
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17
src/Scope.js
View File

@@ -260,7 +260,8 @@ Scope.prototype = {
watcher = {
fn: listenFn,
last: Number.NaN, // NaN !== NaN. We used this to force $watch to fire on first run.
get: get
get: get,
exp: watchExp
};
if (!array) {
@@ -325,7 +326,8 @@ Scope.prototype = {
asyncQueue,
length,
dirty, ttl = 100,
next, current, target = this;
next, current, target = this,
watchLog = [];
if (target.$$phase) {
throw Error(target.$$phase + ' already in progress');
@@ -356,6 +358,14 @@ Scope.prototype = {
dirty = true;
watch.last = copy(value);
watch.fn(current, value, last);
if (ttl < 5) {
if (!watchLog[4-ttl]) watchLog[4-ttl] = [];
if (isFunction(watch.exp)) {
watchLog[4-ttl].push('fn: ' + (watch.exp.name || watch.exp.toString()));
} else {
watchLog[4-ttl].push(watch.exp);
}
}
}
} catch (e) {
current.$service('$exceptionHandler')(e);
@@ -376,7 +386,8 @@ Scope.prototype = {
} while ((current = next));
if(!(ttl--)) {
throw Error('100 $digest() iterations reached. Aborting!');
throw Error('100 $digest() iterations reached. Aborting!\n' +
'Watchers fired in the last 5 iterations: ' + toJson(watchLog));
}
} while (dirty);
},

28
test/ScopeSpec.js
View File

@@ -218,14 +218,34 @@ describe('Scope', function() {
});
it('should prevent infinite recursion', function() {
root.$watch('a', function(self, v){self.b++;});
root.$watch('b', function(self, v){self.a++;});
it('should prevent infinite recursion and print watcher expression', function() {
root.$watch('a', function(self){self.b++;});
root.$watch('b', function(self){self.a++;});
root.a = root.b = 0;
expect(function() {
root.$digest();
}).toThrow('100 $digest() iterations reached. Aborting!');
}).toThrow('100 $digest() iterations reached. Aborting!\n'+
'Watchers fired in the last 5 iterations: ' +
'[["a","b"],["a","b"],["a","b"],["a","b"],["a","b"]]');
});
it('should prevent infinite recurcion and print print watcher function name or body',
function() {
root.$watch(function watcherA() {return root.a;}, function(self){self.b++;});
root.$watch(function() {return root.b;}, function(self){self.a++;});
root.a = root.b = 0;
expect(function() {
root.$digest();
}).toThrow('100 $digest() iterations reached. Aborting!\n'+
'Watchers fired in the last 5 iterations: ' +
'[["fn: watcherA","fn: function () {return root.b;}"],'+
'["fn: watcherA","fn: function () {return root.b;}"],'+
'["fn: watcherA","fn: function () {return root.b;}"],'+
'["fn: watcherA","fn: function () {return root.b;}"],'+
'["fn: watcherA","fn: function () {return root.b;}"]]');
});