All tests passing in isolation

Still have weird race conditions & shutdown/error/resume conditions to tackle
This commit is contained in:
Brian M. Carlson 2013-11-11 23:20:04 -06:00
parent 2e33d4acc0
commit 31b2b1da6f
3 changed files with 194 additions and 152 deletions

185
index.js
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@ -1,116 +1,125 @@
var path = require('path')
var resultPath = path.dirname(require.resolve('pg.js')) + '/lib/result'
var Result = require(resultPath)
var Client = require('pg.js').Client
var Result = require('./result')
var Cursor = function(text, values) {
this.text = text
this.values = values
this._connection = null
this.connection = null
this._queue = []
this.state = 'initialized'
this._result = new Result()
this._cb = null
this._rows = null
}
Cursor.prototype._connect = function(cb) {
if(this._connected) return setImmediate(cb);
this._connected = true
Cursor.prototype.submit = function(connection) {
this.connection = connection
var con = connection
var self = this
var client = new Client()
client.connect(function(err) {
if(err) return cb(err);
//remove all listeners from
//client's connection and discard the client
self.connection = client.connection
self.connection.removeAllListeners()
con.parse({
text: this.text
}, true)
var con = self.connection
con.bind({
values: this.values
}, true)
con.parse({
text: self.text
}, true)
con.describe({
type: 'P',
name: '' //use unamed portal
}, true)
con.bind({
values: self.values
}, true)
con.describe({
type: 'P',
name: '' //use unamed portal
}, true)
con.flush()
var onError = function(err) {
cb(err)
con.end()
}
con.once('error', onError)
con.on('rowDescription', function(msg) {
self.rowDescription = msg
con.removeListener('error', onError)
cb(null, con)
})
var onRow = function(msg) {
var row = self.result.parseRow(msg.fields)
self.result.addRow(row)
}
con.on('dataRow', onRow)
con.once('readyForQuery', function() {
con.end()
})
con.once('commandComplete', function() {
self._complete = true
con.sync()
})
})
con.flush()
}
Cursor.prototype._getRows = function(con, n, cb) {
if(this._done) {
return cb(null, [], false)
Cursor.prototype.handleRowDescription = function(msg) {
this._result.addFields(msg.fields)
this.state = 'idle'
if(this._queue.length) {
this._getRows.apply(this, this._queue.shift())
}
}
Cursor.prototype.handleDataRow = function(msg) {
var row = this._result.parseRow(msg.fields)
this._rows.push(row)
}
Cursor.prototype._sendRows = function() {
this.state = 'idle'
setImmediate(function() {
this._cb(null, this._rows)
this._rows = []
}.bind(this))
}
Cursor.prototype.handleCommandComplete = function() {
this._sendRows()
this.state = 'done'
this.connection.sync()
}
Cursor.prototype.handlePortalSuspended = function() {
this._sendRows()
}
Cursor.prototype.handleReadyForQuery = function() {
}
Cursor.prototype.handleError = function(msg) {
this.state = 'error'
this._error = msg
//satisfy any waiting callback
if(this._cb) {
this._cb(msg)
}
//dispatch error to all waiting callbacks
for(var i = 0; i < this._queue.length; i++) {
this._queue.pop()[1](msg)
}
}
Cursor.prototype._getRows = function(rows, cb) {
console.log('get', rows)
this.state = 'busy'
this._cb = cb
this._rows = []
var msg = {
portal: '',
rows: n
rows: rows
}
con.execute(msg, true)
con.flush()
this.result = new Result()
this.result.addFields(this.rowDescription.fields)
var self = this
var onComplete = function() {
self._done = true
cb(null, self.result.rows, self.result)
}
con.once('commandComplete', onComplete)
con.once('portalSuspended', function() {
cb(null, self.result.rows, self.result)
con.removeListener('commandComplete', onComplete)
})
this.connection.execute(msg, true)
this.connection.flush()
}
Cursor.prototype.end = function(cb) {
if(this.statue != 'initialized') {
this.connection.sync()
}
this.connection.end()
this.connection.stream.once('end', cb)
}
Cursor.prototype.read = function(rows, cb) {
console.log('read', rows, this.state)
var self = this
this._connect(function(err) {
if(err) return cb(err);
self._getRows(self.connection, rows, cb)
})
if(this.state == 'idle') {
return this._getRows(rows, cb)
}
if(this.state == 'busy' || this.state == 'initialized') {
return this._queue.push([rows, cb])
}
if(this.state == 'error') {
return cb(this._error)
}
if(this.state == 'done') {
return cb(null, [])
}
else {
throw new Error("Unknown state: " + this.state)
}
}
module.exports = function(query, params) {
return new Cursor(query, params)
}
module.exports = Cursor

12
result.js Normal file
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@ -0,0 +1,12 @@
var path = require('path')
var pgPath;
//support both pg & pg.js
//this will eventually go away when i break native bindings
//out into their own module
try {
pgPath = path.dirname(require.resolve('pg'))
} catch(e) {
pgPath = path.dirname(require.resolve('pg.js'))
}
module.exports = require(path.join(pgPath, 'lib', 'result.js'))

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@ -1,86 +1,107 @@
var assert = require('assert')
var pgCursor = require('../')
var gonna = require('gonna')
var Cursor = require('../')
var pg = require('pg.js')
var text = 'SELECT generate_series as num FROM generate_series(0, 5)'
var values = []
it('fetch 6 when asking for 10', function(done) {
var cursor = pgCursor(text)
cursor.read(10, function(err, res) {
assert.ifError(err)
assert.equal(res.length, 6)
done()
describe('cursor', function() {
var client;
var pgCursor = function(text, values) {
client.connect()
client.on('drain', client.end.bind(client))
return client.query(new Cursor(text, values || []))
}
before(function() {
client = new pg.Client()
})
})
it('end before reading to end', function(done) {
var cursor = pgCursor(text)
cursor.read(3, function(err, res) {
assert.equal(res.length, 3)
cursor.end(done)
after(function() {
client.end()
})
})
it('callback with error', function(done) {
var cursor = pgCursor('select asdfasdf')
cursor.read(1, function(err) {
assert(err)
done()
it('fetch 6 when asking for 10', function(done) {
var cursor = pgCursor(text)
cursor.read(10, function(err, res) {
assert.ifError(err)
assert.equal(res.length, 6)
done()
})
})
})
it('read a partial chunk of data', function(done) {
var cursor = pgCursor(text)
cursor.read(2, function(err, res) {
assert.equal(res.length, 2)
it('end before reading to end', function(done) {
var cursor = pgCursor(text)
cursor.read(3, function(err, res) {
assert.ifError(err)
assert.equal(res.length, 3)
cursor.read(1, function(err, res) {
assert.equal(res.length, 1)
cursor.end(done)
})
})
it('callback with error', function(done) {
var cursor = pgCursor('select asdfasdf')
cursor.read(1, function(err) {
assert(err)
done()
})
})
it('read a partial chunk of data', function(done) {
var cursor = pgCursor(text)
cursor.read(2, function(err, res) {
assert.ifError(err)
assert.equal(res.length, 2)
cursor.read(3, function(err, res) {
assert.equal(res.length, 3)
cursor.read(1, function(err, res) {
assert.ifError(err)
assert.strictEqual(res.length, 0)
assert.equal(res.length, 1)
cursor.read(1, function(err, res) {
assert.ifError(err)
assert.strictEqual(res.length, 0)
done()
})
})
})
})
})
it('read return length 0 past the end', function(done) {
var cursor = pgCursor(text)
cursor.read(2, function(err, res) {
cursor.read(100, function(err, res) {
assert.equal(res.length, 4)
cursor.read(100, function(err, res) {
assert.equal(res.length, 0)
done()
})
})
})
})
})
it('read return length 0 past the end', function(done) {
var cursor = pgCursor(text)
cursor.read(2, function(err, res) {
cursor.read(100, function(err, res) {
assert.equal(res.length, 4)
cursor.read(100, function(err, res) {
assert.equal(res.length, 0)
done()
it('read huge result', function(done) {
this.timeout(10000)
var text = 'SELECT generate_series as num FROM generate_series(0, 1000000)'
var values = []
cursor = pgCursor(text, values);
var count = 0;
var read = function() {
cursor.read(1000, function(err, rows) {
if(err) return done(err);
if(!rows.length) {
assert.equal(count, 1000001)
return done()
}
count += rows.length;
if(count%100000 == 0) {
//console.log(count)
}
setImmediate(read)
})
})
}
read()
})
})
it('read huge result', function(done) {
this.timeout(10000)
var text = 'SELECT generate_series as num FROM generate_series(0, 1000000)'
var values = []
cursor = pgCursor(text, values);
var count = 0;
var read = function() {
cursor.read(1000, function(err, rows) {
if(err) return done(err);
if(!rows.length) {
assert.equal(count, 1000001)
return done()
}
count += rows.length;
if(count%100000 == 0) {
//console.log(count)
}
setImmediate(read)
})
}
read()
})