79 lines
2.3 KiB
JavaScript
79 lines
2.3 KiB
JavaScript
var EventEmitter = require('events').EventEmitter;
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var defaults = require(__dirname + '/defaults');
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var genericPool = require('generic-pool');
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var pools = {
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//dictionary of all key:pool pairs
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all: {},
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//reference to the client constructor - can override in tests or for require('pg').native
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Client: require(__dirname + '/client'),
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getOrCreate: function(clientConfig) {
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clientConfig = clientConfig || {};
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var name = JSON.stringify(clientConfig);
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var pool = pools.all[name];
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if(pool) {
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return pool;
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}
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pool = genericPool.Pool({
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name: name,
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max: defaults.poolSize,
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idleTimeoutMillis: defaults.poolIdleTimeout,
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reapIntervalMillis: defaults.reapIntervalMillis,
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log: defaults.poolLog,
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create: function(cb) {
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var client = new pools.Client(clientConfig);
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client.connect(function(err) {
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if(err) return cb(err, null);
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//handle connected client background errors by emitting event
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//via the pg object and then removing errored client from the pool
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client.on('error', function(e) {
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pool.emit('error', e, client);
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pool.destroy(client);
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});
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// Remove connection from pool on disconnect
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client.on('end', function(e) {
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// Do not enter infinite loop between pool.destroy
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// and client 'end' event...
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if ( ! client._destroying ) {
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pool.destroy(client);
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}
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});
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return cb(null, client);
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});
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},
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destroy: function(client) {
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client._destroying = true;
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client.end();
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}
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});
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pools.all[name] = pool;
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//mixin EventEmitter to pool
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EventEmitter.call(pool);
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for(var key in EventEmitter.prototype) {
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if(EventEmitter.prototype.hasOwnProperty(key)) {
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pool[key] = EventEmitter.prototype[key];
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}
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}
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//monkey-patch with connect method
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pool.connect = function(cb) {
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pool.acquire(function(err, client) {
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if(err) return cb(err, null, function() {/*NOOP*/});
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cb(null, client, function(err) {
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if(err) {
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pool.destroy(client);
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} else {
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pool.release(client);
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}
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});
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});
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};
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return pool;
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}
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};
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module.exports = pools;
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