Always raise 'error' event for non-query errors

For brianc/node-postgres#1503. Not backwards-compatible (semver major).

index.js

@@ -36,7 +36,6 @@ var Client = module.exports = function (config) {
     this._startReading()
   })
 
-  this.on('_queryError', this._onQueryError.bind(this))
   this.on('result', this._onResult.bind(this))
   this.on('readyForQuery', this._onReadyForQuery.bind(this))
 }
@@ -153,11 +152,7 @@ Client.prototype.end = function (cb) {
 
 Client.prototype._readError = function (message) {
   var err = new Error(message || this.pq.errorMessage())
-  if (this._queryCallback) {
-    this.emit('_queryError', err)
-  } else {
-    this.emit('error', err)
-  }
+  this.emit('error', err)
 }
 
 Client.prototype._stopReading = function () {
@@ -175,7 +170,7 @@ Client.prototype._emitResult = function (pq) {
   var status = pq.resultStatus()
   switch (status) {
     case 'PGRES_FATAL_ERROR':
-      this._readError()
+      this._queryError = new Error(this.pq.resultErrorMessage())
       break
 
     case 'PGRES_TUPLES_OK':
@@ -291,10 +286,6 @@ Client.prototype._dispatchQuery = function (pq, fn, cb) {
   this._waitForDrain(pq, cb)
 }
 
-Client.prototype._onQueryError = function (err) {
-  this._queryError = err
-}
-
 Client.prototype._onResult = function (result) {
   if (this._resultCount === 0) {
     this._results = result

test/connection-errors.js

@@ -0,0 +1,18 @@
+'use strict'
+
+var Client = require('../')
+var assert = require('assert')
+
+describe('connection errors', function () {
+  it('raise error events', function (done) {
+    var client = new Client()
+    client.connectSync()
+    client.query('SELECT pg_terminate_backend(pg_backend_pid())', assert.fail)
+    client.on('error', function (err) {
+      assert(/^server closed the connection unexpectedly/.test(err.message))
+      assert.strictEqual(client.pq.resultErrorFields().sqlState, '57P01')
+      client.end()
+      done()
+    })
+  })
+})