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Axon #6

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2b71cfd
Axon rewrite cache
Dec 23, 2013
3abcdaf
Cache axon implementation
Dec 27, 2013
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30 changes: 20 additions & 10 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -135,34 +135,44 @@ module.exports = {
return process.getLogger(__filename);
},

// this will return a promise, which will be resolved after getting two available ports
'enable': _.once(function(options, emitter){

options = options || {};
emitter = emitter || require('cluster-emitter');
emitter = require('./lib/utils').decorateEmitter(emitter);
//var tillCacheServerStarted = when.defer();

emitter.once('CLUSTER-ENABLE-CACHE', function(options){

var master = options.master,
mode = options.mode || 'master';

if(!master || mode === 'master'){
var mgr = require('./lib/cache-mgr'),
svr = mgr.createServer(mgr.app);

svr.listen(mgr.port, mgr.afterServerStarted);
process.env.CACHE_BASE_PORT = master ? master.port + 10 : 9190;
var mgr = require('./lib/cache-mgr');
mgr.configApp(mgr.app).then(function (ports) {
mgr.port = ports;
var svr = mgr.createServer(mgr.app);
process.cacheServer = svr;

svr.listen(ports, mgr.afterServerStarted);
}, function (error) {
logger.error('[cache] start server error %j', error);
});
}
else{
//it's master's job to fork another worker specificly as the cache manager
master.fork(master.options, {
'CACHE_MANAGER': true
'CACHE_MANAGER': true,
'CACHE_BASE_PORT': master.port + 10
});
}
});

//if it's none cluster mode, above registered cache initialization will take effect
//otherwise, in cluster mode, master will be responsible instead
emitter.to(['master']).emit('CLUSTER-ENABLE-CACHE', options);
//return tillCacheServerStarted.promise;
}),

'use': function(namespace, options){
Expand All @@ -180,10 +190,10 @@ module.exports = {

return new Cache(namespace, pipeline([

function(domain){
function(ports){

logger.debug('[cache] using domain:%s', domain);
return _this.user.use(domain);
logger.debug('[cache] using ports: %j', ports);
return _this.user.use(ports);
},

function(usr){
Expand All @@ -206,7 +216,7 @@ module.exports = {
'meta': meta
};
}
], actualOptions.domain));//optional
], actualOptions.ports));//optional
},

'manager': require('./lib/cache-mgr'),
Expand Down
173 changes: 66 additions & 107 deletions lib/cache-mgr.js
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Original file line number Diff line number Diff line change
Expand Up @@ -3,30 +3,20 @@
var common = require('./cache-common'),
_ = require('underscore'),
fs = require('graceful-fs'),
os = require('os'),
net = require('net'),
util = require('util'),
path = require('path'),
when = require('when'),
timeout = require('when/timeout'),
ensureDir = require('./utils').ensureDir,
pickAvailablePorts = require('./utils').pickAvailablePorts,
logger = require('./utils').logger;

var success = common.status.success,
failure = common.status.failure,
NS = common.types.NS,
GET = common.types.GET,
SET = common.types.SET,
DEL = common.types.DEL,
ALL = common.types.ALL,
LOCK = common.types.LOCK,
INSPECT = common.types.INSPECT,
PING = common.types.PING,
PONG = common.types.PONG,
CHN = common.changeToken,
domain = '/tmp/cache.socket.' + process.pid,
domainPath = common.domainPath,
persistPath = common.persistPath,
ports = null,
namespaces = {
'': { //meta namespace
'': { //meta of meta namespace itself
Expand All @@ -47,36 +37,31 @@ var success = common.status.success,
'persist': false,
'expire': 0
};//default meta
},
conns = [];
};

var manager = {

'domain': domain,
'ports': ports,

'ns': function(conn, token){
'ns': function(reply){

common.write(conn, common.serialize({
'type': NS,
'token': token,
reply({
'namespaces': _.keys(namespaces),
'status': success
}));
});
},

'all': function(conn, token, namespace){
'all': function(reply, namespace){

var cache = namespaces[namespace] || {};

common.write(conn, common.serialize({
'type': ALL,
'token': token,
reply({
'keys': _.keys(cache),
'status': success
}));
});
},

'lock': function(conn, token, namespace, key, value){
'lock': function(reply, namespace, key, value){

var cache = namespaces[namespace] = namespaces[namespace] || {},
write = cache[key] === undefined;
Expand All @@ -87,15 +72,13 @@ var manager = {
};
}

common.write(conn, common.serialize({
'type': LOCK,
'token': token,
reply({
'key': key,
'status': write ? success: failure
}));
});
},

'set': function(conn, token, namespace, key, value, overwrite){
'set': function(reply, namespace, key, value, overwrite){

var cache = namespaces[namespace] = namespaces[namespace] || {},
meta = metaOfNs(namespace),
Expand All @@ -110,12 +93,10 @@ var manager = {
}
: cache[key];

common.write(conn, common.serialize({
'type': SET,
'token': token,
reply({
'key': key,
'status': write ? success: failure
}));
});

if(write){

Expand All @@ -127,16 +108,14 @@ var manager = {

'notify': function(namespace, key, value){

var notify = common.serialize({
var notify = {
'token': CHN,
'ns': namespace,
'key': key,
'value': value
});
};

_.each(conns, function(c){
common.write(c, notify);
});
this.cacheSocket.send(notify);

if(namespace === ''
&& value === undefined
Expand All @@ -146,40 +125,36 @@ var manager = {
}
},

'get': function(conn, token, namespace, key, value){
'get': function(reply, namespace, key, value){

var cache = namespaces[namespace] || {},
entry = cache[key] || {},
result = {
'type': GET,
'token': token,
'key': key,
'value': entry.value || value,//default
'status': success
};

common.write(conn, common.serialize(result));
reply(result);
},

'ins': function(conn, token, namespace, key){
'ins': function(reply, namespace, key){

var cache = namespaces[namespace] || {},
meta = metaOfNs(namespace),
entry = cache[key],
result = {
'type': INSPECT,
'token': token,
'key': key,
'value': entry ? entry.value : null,
'persist': meta.persist,
'expire': meta.expire && entry ? Date.now() - entry.expire : meta.expire,
'status': success
};

common.write(conn, common.serialize(result));
reply(result);
},

'del': function(conn, token, namespace, key){
'del': function(reply, namespace, key){

var cache = namespaces[namespace] || {},
entry = cache[key] || {},
Expand All @@ -189,83 +164,67 @@ var manager = {

metaOfNs(namespace).lastModified = Date.now();

common.write(conn, common.serialize({
'type': DEL,
'token': token,
reply({
'key': key,
'value': value,
'status': success
}));
});

manager.notify(namespace, key, undefined);
},

'ping': function(conn, token){
'ping': function(){

common.write(conn, common.serialize({
'type': PING,
this.cacheSocket.send({
'token': PONG
}));
});
},

'pong': function(conn, token){
'pong': function(reply){
//nothing
}
};

module.exports = {

'createServer': net.createServer,

'app': function(conn) { //'connection' listener

conns.push(conn);

var buff = '';

conn.setEncoding('utf-8');
conn.counter = 0;

conn.on('data', function(data){

buff += data;

var packs = buff.split('\r\n');

if(packs.length > 1){
buff = packs.pop();//whatever the last element is, could be empty string, or partial data, wait till next data arrives.

_.each(packs, function(pack){

conn.counter += 1;

var command = common.deserialize(pack);

manager[command.type].apply(manager, [
conn, command.token, command.ns, command.key, command.value, !command.leaveIfNonNull
]);
});
}//otherwise keep buffering...
});

var keepAlive = setInterval(function(){
//this is to keep the connection open, just to send PING, and receive PONG, and will be extended to validate the health of the connection later
manager.ping(conn, PONG);

}, 3000);//ping/pong every 3secs

conn.once('close', function(){

logger().info('connection closed who has received:%d', conn.counter);
'configApp': function configApp(app) {
var basePort = parseInt(process.env.CACHE_BASE_PORT) || 9190;
return pickAvailablePorts(basePort, basePort + 10, 2).then(function (ports) {
logger().info('[cache-mgr] picked up ports %j', ports);
manager.ports = ports;
return manager.ports;
}, function (error) {
logger().error(error);
});
},

conns = _.without(conns, conn);
conn.destroy();
'createServer': function createServer(app) {
return app;
},

clearInterval(keepAlive);
});
},
'app': (function () { //'connection' listener
manager.cacheSocket = require('./cache-socket/cache-socket-factory').getCacheSocket('manager', 'json');

manager.cacheSocket.on('message', function (command, reply) {
manager[command.type].apply(manager, [
reply, command.ns, command.key, command.value, !command.leaveIfNonNull
]);
});

var keepAlive = setInterval(function(){
//this is to keep the connection open, just to send PING, and receive PONG, and will be extended to validate the health of the connection later
manager.ping(PONG);
}, 3000);

manager.cacheSocket.once('close', function () {
logger().info('[cache-mgr] cacheSocket closed');
clearInterval(keepAlive);
});

'port': domain,
return manager.cacheSocket;
})(),

'port': manager.ports,

'afterServerStarted': function() { //'listening' listener

Expand Down Expand Up @@ -309,7 +268,7 @@ module.exports = {
logger().info('[cache] manager loaded from all persistences');

//register domain to where all other users and the master process could watch
fs.writeFileSync(domainPath, domain);
fs.writeFileSync(domainPath, JSON.stringify(manager.ports));

var nextUpdate = null,
updateTask = function updateTask(){
Expand Down
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