Collect and send crash logs with email

crashnotifier.js

@@ -8,14 +8,43 @@
 //         !! Do not set DEBUG
 
 var supervisor = require('supervisord-eventlistener'),
+    assert = require('assert'),
+    util = require('util'),
+    fs = require('fs'),
     mailer = require('./src/mailer.js');
 
+function collectLogs(program, callback) {
+    assert(typeof program === 'string');
+    assert(typeof callback === 'function');
+
+    var logFilePath = '';
+    if (program === 'box') logFilePath = '/var/log/supervisor/box.log';
+
+    if (!fs.existsSync(logFilePath)) return callback(new Error(util.format('Log file %s does not exist.', logFilePath)));
+
+    fs.readFile(logFilePath, 'utf-8', function (error, data) {
+        if (error) return callback(error);
+
+        var lines = data.split('\n');
+        var logLines = lines.slice(-100);
+
+        callback(null, logLines.join('\n'));
+    });
+}
+
 supervisor.on('PROCESS_STATE_EXITED', function (headers, data) {
     if (data.expected === '1') return console.error('Normal app %s exit', data.processname);
 
     console.error('%s exited unexpectedly, send mail', data.processname);
 
-    mailer.sendCrashNotification(data.processname, '');
+    collectLogs(data.processname, function (error, result) {
+        if (error) {
+            console.error('Failed to collect logs.', error);
+            result = util.format('Failed to collect logs.', error);
+        }
+
+        mailer.sendCrashNotification(data.processname, result);
+    });
 });
 
 mailer.initialize(function () {