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/**
* Copyright 2009 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import("fastJSON");
import("etherpad.log");
import("cache_utils.syncedWithCache");
import("funhtml.*");
import("jsutils.{eachProperty,keys}");
function _dayKey(date) {
return [date.getFullYear(), date.getMonth()+1, date.getDate()].join(',');
}
function _dateAddDays(date, numDays) {
return new Date((+date) + numDays*1000*60*60*24);
}
function _loadDay(date) {
var fileName = log.frontendLogFileName('exception', date);
if (! fileName) {
return [];
}
var reader = new java.io.BufferedReader(new java.io.FileReader(fileName));
var line = null;
var array = [];
while ((line = reader.readLine()) !== null) {
array.push(fastJSON.parse(line));
}
return array;
}
function _accessLatestLogs(func) {
syncedWithCache("etherpad.statistics.exceptions", function(exc) {
if (! exc.byDay) {
exc.byDay = {};
}
// always reload today from disk
var now = new Date();
var today = now;
var todayKey = _dayKey(today);
exc.byDay[todayKey] = _loadDay(today);
var activeKeys = {};
activeKeys[todayKey] = true;
// load any of 7 previous days that aren't loaded or
// were not loaded as a historical day
for(var i=1;i<=7;i++) {
var pastDay = _dateAddDays(today, -i);
var pastDayKey = _dayKey(pastDay);
activeKeys[pastDayKey] = true;
if ((! exc.byDay[pastDayKey]) || (! exc.byDay[pastDayKey].sealed)) {
exc.byDay[pastDayKey] = _loadDay(pastDay);
exc.byDay[pastDayKey].sealed = true; // in the past, won't change
}
}
// clear old days
for(var k in exc.byDay) {
if (! (k in activeKeys)) {
delete exc.byDay[k];
}
}
var logs = {
getDay: function(daysAgo) {
return exc.byDay[_dayKey(_dateAddDays(today, -daysAgo))];
},
eachLineInLastNDays: function(n, func) {
var oldest = _dateAddDays(now, -n);
var oldestNum = +oldest;
for(var i=n;i>=0;i--) {
var lines = logs.getDay(i);
lines.forEach(function(line) {
if (line.date > oldestNum) {
func(line);
}
});
}
}
};
func(logs);
});
}
function _exceptionHash(line) {
// skip the first line of jsTrace, take hashCode of rest
var trace = line.jsTrace;
var stack = trace.substring(trace.indexOf('\n') + 1);
return new java.lang.String(stack).hashCode();
}
// Used to take a series of strings and produce an array of
// [common prefix, example middle, common suffix], or
// [string] if the strings are the same. Takes oldInfo
// and returns newInfo; each is either null or an array
// of length 1 or 3.
function _accumCommonPrefixSuffix(oldInfo, newString) {
function _commonPrefixLength(a, b) {
var x = 0;
while (x < a.length && x < b.length && a.charAt(x) == b.charAt(x)) {
x++;
}
return x;
}
function _commonSuffixLength(a, b) {
var x = 0;
while (x < a.length && x < b.length &&
a.charAt(a.length-1-x) == b.charAt(b.length-1-x)) {
x++;
}
return x;
}
if (! oldInfo) {
return [newString];
}
else if (oldInfo.length == 1) {
var oldString = oldInfo[0];
if (oldString == newString) {
return oldInfo;
}
var newInfo = [];
var a = _commonPrefixLength(oldString, newString);
newInfo[0] = newString.substring(0, a);
oldString = oldString.substring(a);
newString = newString.substring(a);
var b = _commonSuffixLength(oldString, newString);
newInfo[2] = newString.slice(-b);
oldString = oldString.slice(0, -b);
newString = newString.slice(0, -b);
newInfo[1] = newString;
return newInfo;
}
else {
// oldInfo.length == 3
var a = _commonPrefixLength(oldInfo[0], newString);
var b = _commonSuffixLength(oldInfo[2], newString);
return [newString.slice(0, a), newString.slice(a, -b),
newString.slice(-b)];
}
}
function render() {
_accessLatestLogs(function(logs) {
var weekCounts = {};
var totalWeekCount = 0;
// count exceptions of each kind in last week
logs.eachLineInLastNDays(7, function(line) {
var hash = _exceptionHash(line);
weekCounts[hash] = (weekCounts[hash] || 0) + 1;
totalWeekCount++;
});
var dayData = {};
var totalDayCount = 0;
// accumulate data about each exception in last 24 hours
logs.eachLineInLastNDays(1, function(line) {
var hash = _exceptionHash(line);
var oldData = dayData[hash];
var data = (oldData || {});
if (! oldData) {
data.hash = hash;
data.trace = line.jsTrace.substring(line.jsTrace.indexOf('\n')+1);
data.trackers = {};
}
var msg = line.jsTrace.substring(0, line.jsTrace.indexOf('\n'));
data.message = _accumCommonPrefixSuffix(data.message, msg);
data.count = (data.count || 0)+1;
data.trackers[line.tracker] = true;
totalDayCount++;
dayData[hash] = data;
});
// put day datas in an array and sort
var dayDatas = [];
eachProperty(dayData, function(k,v) {
dayDatas.push(v);
});
dayDatas.sort(function(a, b) {
return b.count - a.count;
});
// process
dayDatas.forEach(function(data) {
data.weekCount = (weekCounts[data.hash] || 0);
data.numTrackers = keys(data.trackers).length;
});
// gen HTML
function num(n) { return SPAN({className:'num'}, n); }
response.write(STYLE(html(".trace { height: 300px; overflow: auto; background: #eee; margin-left: 1em; font-family: monospace; border: 1px solid #833; padding: 4px; }\n"+
".exc { margin: 1em 0; }\n"+
".num { font-size: 150%; }")));
response.write(P("Total exceptions in past day: ", num(totalDayCount),
", past week: ", totalWeekCount));
response.write(P(SMALL(EM("Data on this page is live."))));
response.write(H2("Exceptions grouped by stack trace:"));
dayDatas.forEach(function(data) {
response.write(DIV({className:'exc'},
'Past day: ',num(data.count),', Past week: ',
data.weekCount,', Different tracker cookies today: ',
data.numTrackers,
'\n',data.message[0],
(data.message[1] && I(data.message[1])) || '',
(data.message[2] || ''),'\n',
DIV({className:'trace'}, data.trace)));
});
});
}
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