Implemented per-client type parser overrides.

Adds Client#getTypeParser() and Client#setTypeParser().

Author: whitelynx

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 types = require('pg-types');
 
 var ConnectionParameters = require(__dirname + '/connection-parameters');
 var Query = require(__dirname + '/query');
@@ -30,6 +31,12 @@ var Client = function(config) {
   this.processID = null;
   this.secretKey = null;
   this.ssl = this.connectionParameters.ssl || false;
+
+  this._types = config.types || types;
+  this._parserOverrides = {
+    text: {},
+    binary: {}
+  };
 };
 
 util.inherits(Client, EventEmitter);
@@ -227,6 +234,20 @@ Client.prototype.cancel = function(client, query) {
   }
 };
 
+Client.prototype.setTypeParser = function(oid, format, parseFn) {
+  if(typeof format == 'function') {
+    parseFn = format;
+    format = 'text';
+  }
+  this._parserOverrides[format][oid] = parseFn;
+};
+
+Client.prototype.getTypeParser = function(oid, format) {
+  format = format || 'text';
+  var formatParserOverrides = this._parserOverrides[format] || {};
+  return formatParserOverrides[oid] || 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 +323,7 @@ Client.prototype.query = function(config, values, callback) {
   if(this.binary && !query.binary) {
     query.binary = true;
   }
+  query._result._getTypeParser = this.getTypeParser.bind(this);
 
   this.queryQueue.push(query);
   this._pulseQueryQueue();

lib/native/index.js

@@ -1,4 +1,5 @@
 var Native = require('pg-native');
+var types = require('pg-types');
 var semver = require('semver');
 var pkg = require('../../package.json');
 var assert = require('assert');
@@ -16,7 +17,7 @@ var Client = module.exports = function(config) {
   config = config || {};
 
   this.native = new Native({
-    types: config.types || require('pg-types')
+    types: {getTypeParser: this.getTypeParser.bind(this)}
   });
 
   this._queryQueue = [];
@@ -33,6 +34,12 @@ var Client = module.exports = function(config) {
 
   //a hash to hold named queries
   this.namedQueries = {};
+
+  this._types = config.types || types;
+  this._parserOverrides = {
+    text: {},
+    binary: {}
+  };
 };
 
 util.inherits(Client, EventEmitter);
@@ -180,3 +187,17 @@ Client.prototype.cancel = function(query) {
     this._queryQueue.splice(this._queryQueue.indexOf(query), 1);
   }
 };
+
+Client.prototype.setTypeParser = function(oid, format, parseFn) {
+  if(typeof format == 'function') {
+    parseFn = format;
+    format = 'text';
+  }
+  this._parserOverrides[format][oid] = parseFn;
+};
+
+Client.prototype.getTypeParser = function(oid, format) {
+  format = format || 'text';
+  var formatParserOverrides = this._parserOverrides[format] || {};
+  return formatParserOverrides[oid] || 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;