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metrics_util.js
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metrics_util.js
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var Q = require('q');
var sqlite3 = require('sqlite3'); //.verbose();
var nbind = function(obj, method) { return Q.nbind(method, obj) };
var db_all = function(dbconn) { return nbind(dbconn, dbconn.all); };
var get_promise = function(value) {
return Q.fcall(function() { return value; }) };
var default_events_ignore = [
'outgoing-by-extension',
'default-incoming',
'outgoing-dialstatus-ANSWER',
'outgoing-dialstatus-BUSY'];
var default_max_events = 50;
var defaultFrequentDays = 30;
var defaultRecentDays = 7;
var badEvents = [
"incoming-dialstatus-CHANUNAVAIL",
"outgoing-dialstatus-CONGESTION"]
var frequent_events = function(
dbFileName, events_ignore, max_events, days, extension, callback) {
if (events_ignore === null) {
events_ignore = default_events_ignore;
}
if (max_events === null) {
max_events = default_max_events;
}
if (days === null) {
days = defaultFrequentDays;
}
if (extension !== null) {
channel_clause = " AND channel_extension = ?";
} else {
channel_clause = null;
}
// format arguments
days = '-' + days.toString() + ' day';
// construct appropriate length param sequence literal
var events_ignore_sub = events_ignore.map(function (x) {return "?"});
events_ignore_sub = events_ignore_sub.join();
events_ignore_sub = '(' + events_ignore_sub + ')';
// construct parameterized statement
var statement = "SELECT name, COUNT(name) AS count FROM metrics WHERE timestamp > date('now', ?) AND name NOT IN " + events_ignore_sub;
if (extension !== null) {
statement = statement + channel_clause;
}
statement = statement + " GROUP BY name ORDER BY COUNT(name) DESC LIMIT ?";
var params = [];
params.push(days);
params.push.apply(params, events_ignore);
if (extension !== null) {
params.push(extension);
}
params.push(max_events);
var db = new sqlite3.Database(dbFileName);
Q.fcall(db_all(db), statement, params)
.then(function(rows) {
db.close();
return rows;
}).then(function(rows) {
callback(rows);
})
.fail(function(err) { console.log(err) })
}
var all_extensions = function(dbconn) {
return Q.fcall(
db_all(dbconn),
"SELECT DISTINCT(channel_extension) FROM metrics",
[])
.then(function(rows) {
return rows.map(function(row) { return row.channel_extension; })});
}
var get_latest_events = function(dbconn, extension, events, limit) {
query = "SELECT channel_extension, name, timestamp FROM metrics";
params = [];
if (extension !== null) {
query = query + " WHERE channel_extension=?";
params.push(extension);
}
if (events !== null) {
var eventsSub = events.map(function (x) {return "?"});
eventsSub = eventsSub.join();
eventsSub = '(' + eventsSub + ')';
// XXX assums no extension clause, get a smarter join
query = query + " WHERE name IN " + eventsSub;
params.push.apply(params, events);
}
query = query + " ORDER BY timestamp DESC LIMIT ?";
params.push(limit);
return Q.fcall(db_all(dbconn), query, params)
};
var latest_events = function(dbFileName, extension, callback) {
var db = new sqlite3.Database(dbFileName);
if (extension !== null) {
var get_extensions = get_promise([extension]);
} else {
var get_extensions = all_extensions(db);
}
get_extensions
.then(function(extensions) {
return Q.all(
extensions.map(
function(extension) {
return get_latest_events(db, extension, null, 1); }));
}).then(function(rows) {
db.close();
return rows;
}).then(function(rows) {
rows = rows.map(function(r) { return r.pop(); });
var compare = function(a, b) {
if (a.timestamp < b.timestamp) {
return -1;
} else if (a.timestamp > b.timestamp) {
return 1;
} else {
return 0;
}
};
rows.sort(compare);
rows.reverse();
callback(rows);
})
.fail(function(err) {
console.log(err);
})
}
var recentEvents = function(
dbFileName, maxEvents, maxDays, events, callback) {
var db = new sqlite3.Database(dbFileName);
if (maxEvents === null) {
maxEvents = default_max_events;
}
if (maxDays === null) {
maxDays = defaultRecentDays;
}
if (events === null) {
events = badEvents;
}
get_latest_events(db, null, events, maxEvents)
.then(function(rows) {
db.close();
return rows;
}).then(function(rows) {
callback(rows);
})
.fail(function(err) {
console.log(err);
})
}
module.exports = {
frequent_events: frequent_events,
latest_events: latest_events,
recentEvents: recentEvents
};