Merge pull request brianc#679 from whitelynx/master

Added per-client type parser overrides.

Author: brianc

lib/client.js

@@ -2,6 +2,7 @@ var crypto = require('crypto');
 var EventEmitter = require('events').EventEmitter;
 var util = require('util');
 var pgPass = require('pgpass');
+var TypeOverrides = require('./type-overrides');
 
 var ConnectionParameters = require(__dirname + '/connection-parameters');
 var Query = require(__dirname + '/query');
@@ -20,6 +21,8 @@ var Client = function(config) {
 
   var c = config || {};
 
+  this._types = new TypeOverrides(c.types);
+
   this.connection = c.connection || new Connection({
     stream: c.stream,
     ssl: this.connectionParameters.ssl
@@ -227,6 +230,14 @@ Client.prototype.cancel = function(client, query) {
   }
 };
 
+Client.prototype.setTypeParser = function(oid, format, parseFn) {
+  return this._types.setTypeParser(oid, format, parseFn);
+};
+
+Client.prototype.getTypeParser = function(oid, format) {
+  return this._types.getTypeParser(oid, format);
+};
+
 // Ported from PostgreSQL 9.2.4 source code in src/interfaces/libpq/fe-exec.c
 Client.prototype.escapeIdentifier = function(str) {
 
@@ -302,6 +313,7 @@ Client.prototype.query = function(config, values, callback) {
   if(this.binary && !query.binary) {
     query.binary = true;
   }
+  query._result._getTypeParser = this._types.getTypeParser.bind(this._types);
 
   this.queryQueue.push(query);
   this._pulseQueryQueue();

lib/native/index.js

@@ -1,4 +1,5 @@
 var Native = require('pg-native');
+var TypeOverrides = require('../type-overrides');
 var semver = require('semver');
 var pkg = require('../../package.json');
 var assert = require('assert');
@@ -15,8 +16,10 @@ var Client = module.exports = function(config) {
   EventEmitter.call(this);
   config = config || {};
 
+  this._types = new TypeOverrides(config.types);
+
   this.native = new Native({
-    types: config.types || require('pg-types')
+    types: this._types
   });
 
   this._queryQueue = [];
@@ -180,3 +183,11 @@ Client.prototype.cancel = function(query) {
     this._queryQueue.splice(this._queryQueue.indexOf(query), 1);
   }
 };
+
+Client.prototype.setTypeParser = function(oid, format, parseFn) {
+  return this._types.setTypeParser(oid, format, parseFn);
+};
+
+Client.prototype.getTypeParser = function(oid, format) {
+  return this._types.getTypeParser(oid, format);
+};

lib/result.js

@@ -88,7 +88,7 @@ Result.prototype.addFields = function(fieldDescriptions) {
   for(var i = 0; i < fieldDescriptions.length; i++) {
     var desc = fieldDescriptions[i];
     this.fields.push(desc);
-    var parser = types.getTypeParser(desc.dataTypeID, desc.format || 'text');
+    var parser = this._getTypeParser(desc.dataTypeID, desc.format || 'text');
     this._parsers.push(parser);
     //this is some craziness to compile the row result parsing
     //results in ~60% speedup on large query result sets
@@ -99,4 +99,6 @@ Result.prototype.addFields = function(fieldDescriptions) {
   }
 };
 
+Result.prototype._getTypeParser = types.getTypeParser;
+
 module.exports = Result;

lib/type-overrides.js

@@ -0,0 +1,30 @@
+var types = require('pg-types');
+
+function TypeOverrides(userTypes) {
+  this._types = userTypes || types;
+  this.text = {};
+  this.binary = {};
+}
+
+TypeOverrides.prototype.getOverrides = function(format) {
+  switch(format) {
+    case 'text': return this.text;
+    case 'binary': return this.binary;
+    default: return {};
+  }
+};
+
+TypeOverrides.prototype.setTypeParser = function(oid, format, parseFn) {
+  if(typeof format == 'function') {
+    parseFn = format;
+    format = 'text';
+  }
+  this.getOverrides(format)[oid] = parseFn;
+};
+
+TypeOverrides.prototype.getTypeParser = function(oid, format) {
+  format = format || 'text';
+  return this.getOverrides(format)[oid] || this._types.getTypeParser(oid, format);
+};
+
+module.exports = TypeOverrides;

test/integration/client/type-parser-override-tests.js

@@ -0,0 +1,34 @@
+var helper = require(__dirname + '/test-helper');
+
+function testTypeParser(client, expectedResult, done) {
+  var boolValue = true;
+  client.query('CREATE TEMP TABLE parserOverrideTest(id bool)');
+  client.query('INSERT INTO parserOverrideTest(id) VALUES ($1)', [boolValue]);
+  client.query('SELECT * FROM parserOverrideTest', assert.success(function(result) {
+    assert.equal(result.rows[0].id, expectedResult);
+    helper.pg.end();
+    done();
+  }));
+}
+
+helper.pg.connect(helper.config, assert.success(function(client1, done1) {
+  helper.pg.connect(helper.config, assert.success(function(client2, done2) {
+    var boolTypeOID = 16;
+    client1.setTypeParser(boolTypeOID, function(){
+      return 'first client';
+    });
+    client2.setTypeParser(boolTypeOID, function(){
+      return 'second client';
+    });
+
+    client1.setTypeParser(boolTypeOID, 'binary', function(){
+      return 'first client binary';
+    });
+    client2.setTypeParser(boolTypeOID, 'binary', function(){
+      return 'second client binary';
+    });
+
+    testTypeParser(client1, 'first client', done1);
+    testTypeParser(client2, 'second client', done2);
+  }));
+}));