fix uuid overflow in prepared statement id generation.

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "vendor/swift-db-datetime"]
+	path = vendor/swift-db-datetime
+	url = https://github.com/deepfryed/swift-db-datetime.git

CHANGELOG

@@ -1,3 +1,7 @@
+== 0.3.1 (2015-03-22)
+
+* prepared statement uuid overflow fix. 
+
 == 0.3.0 (2013-02-19)
 
 * supports encoding option while connecting. 

README.md

@@ -10,6 +10,18 @@ MRI adapter for PostgreSQL
 * Asynchronous support using PQsendQuery family of functions
 * Nested transactions
 
+## Requirements
+
+* postgresql client deveopment libraries (libpq-dev)
+* uuid development libraries (uuid-dev)
+
+## Building
+
+```
+git submodule update --init
+rake
+```
+
 ## API
 
 ```

Rakefile

@@ -7,7 +7,7 @@ require 'rake/testtask'
 $rootdir = Pathname.new(__FILE__).dirname
 $gemspec = Gem::Specification.new do |s|
   s.name              = 'swift-db-postgres'
-  s.version           = '0.3.0'
+  s.version           = '0.3.1'
   s.date              = Date.today
   s.authors           = ['Bharanee Rathna']
   s.email             = ['deepfryed@gmail.com']

ext/swift/db/postgres/common.c

@@ -12,11 +12,12 @@ VALUE rb_uuid_string() {
     char uuid_hex[sizeof(uuid_t) * 2 + 1];
 
     uuid_generate(uuid);
+
+    memset(uuid_hex, 0, sizeof(uuid_hex));
     for (n = 0; n < sizeof(uuid_t); n++)
-        sprintf(uuid_hex + n * 2 + 1, "%02x", uuid[n]);
+        sprintf(uuid_hex + n * 2, "%02x", uuid[n]);
 
-    uuid_hex[0] = 'u';
-    return rb_str_new(uuid_hex, sizeof(uuid_t) * 2 + 1);
+    return rb_str_new(uuid_hex, sizeof(uuid_t) * 2);
 }
 
 /* NOTE: very naive, no regex etc. */

ext/swift/db/postgres/datetime.c

@@ -0,0 +1 @@
+../../../../vendor/swift-db-datetime/src/swift/db/datetime.c

ext/swift/db/postgres/datetime.h

@@ -0,0 +1 @@
+../../../../vendor/swift-db-datetime/src/swift/db/datetime.h

test/test_async.rb

@@ -2,33 +2,34 @@
 
 describe 'async operations' do
   it 'can query async and call block with result when ready' do
-    rows = []
-    pool = 3.times.map {Swift::DB::Postgres.new(db: 'swift_test')}
+    rows    = []
+    threads = []
+    pool    = 3.times.map {Swift::DB::Postgres.new(db: 'swift_test')}
 
     3.times do |n|
-      Thread.new do
+      threads << Thread.new do
         pool[n].query("select pg_sleep(#{(3 - n) / 10.0}), #{n + 1} as query_id") {|row| rows << row[:query_id]}
       end
     end
 
-    Thread.list.reject {|thread| Thread.current == thread}.each(&:join)
+    threads.each(&:join)
     assert_equal [3, 2, 1], rows
   end
 
   it 'returns and allows IO poll on connection file descriptor' do
-
-    rows = []
-    pool = 3.times.map {Swift::DB::Postgres.new(db: 'swift_test')}
+    rows    = []
+    threads = []
+    pool    = 3.times.map {Swift::DB::Postgres.new(db: 'swift_test')}
 
     3.times do |n|
-      Thread.new do
+      threads << Thread.new do
         pool[n].query("select pg_sleep(#{(3 - n) / 10.0}), #{n + 1} as query_id")
         IO.select([IO.for_fd(pool[n].fileno)], [], [])
         rows << pool[n].result.first[:query_id]
       end
     end
 
-    Thread.list.reject {|thread| Thread.current == thread}.each(&:join)
+    threads.each(&:join)
     assert_equal [3, 2, 1], rows
   end
 end