wrap sqlalchemy exceptions in a generic error

bin/nova-manage

@@ -61,7 +61,6 @@ import sys
 import time
 
 import IPy
-from sqlalchemy import exc
 
 # If ../nova/__init__.py exists, add ../ to Python search path, so that
 # it will override what happens to be installed in /usr/(local/)lib/python...
@@ -280,7 +279,7 @@ class UserCommands(object):
         arguments: name [access] [secret]"""
         try:
             user = self.manager.create_user(name, access, secret, True)
-        except exc.OperationalError, e:
+        except exception.DBError, e:
             _db_error(e)
         self._print_export(user)
 
@@ -289,7 +288,7 @@ class UserCommands(object):
         arguments: name [access] [secret]"""
         try:
             user = self.manager.create_user(name, access, secret, False)
-        except exc.OperationalError, e:
+        except exception.DBError, e:
             _db_error(e)
         self._print_export(user)
 

contrib/nova.sh

@@ -1,15 +1,14 @@
 #!/usr/bin/env bash
 DIR=`pwd`
 CMD=$1
-SOURCE_BRANCH=lp:nova
+if [ "$CMD" = "branch" ]; then
-if [ -n "$2" ]; then
+    SOURCE_BRANCH=${2:-lp:nova}
-    SOURCE_BRANCH=$2
+    DIRNAME=${3:-nova}
+else
+    DIRNAME=${2:-nova}
 fi
-DIRNAME=nova
+
 NOVA_DIR=$DIR/$DIRNAME
-if [ -n "$3" ]; then
-    NOVA_DIR=$DIR/$3
-fi
 
 if [ ! -n "$HOST_IP" ]; then
     # NOTE(vish): This will just get the first ip in the list, so if you
@@ -45,7 +44,68 @@ else
     AUTH=dbdriver.DbDriver
 fi
 
-mkdir -p /etc/nova
+if [ "$CMD" == "branch" ]; then
+    sudo apt-get install -y bzr
+    if [ ! -e "$DIR/.bzr" ]; then
+        bzr init-repo $DIR
+    fi
+    rm -rf $NOVA_DIR
+    bzr branch $SOURCE_BRANCH $NOVA_DIR
+    cd $NOVA_DIR
+    mkdir -p $NOVA_DIR/instances
+    mkdir -p $NOVA_DIR/networks
+    exit
+fi
+
+# You should only have to run this once
+if [ "$CMD" == "install" ]; then
+    sudo apt-get install -y python-software-properties
+    sudo add-apt-repository ppa:nova-core/trunk
+    sudo apt-get update
+    sudo apt-get install -y dnsmasq-base kpartx kvm gawk iptables ebtables
+    sudo apt-get install -y user-mode-linux kvm libvirt-bin
+    sudo apt-get install -y screen euca2ools vlan curl rabbitmq-server
+    sudo apt-get install -y lvm2 iscsitarget open-iscsi
+    sudo apt-get install -y socat
+    echo "ISCSITARGET_ENABLE=true" | sudo tee /etc/default/iscsitarget
+    sudo /etc/init.d/iscsitarget restart
+    sudo modprobe kvm
+    sudo /etc/init.d/libvirt-bin restart
+    sudo modprobe nbd
+    sudo apt-get install -y python-twisted python-sqlalchemy python-mox python-greenlet python-carrot
+    sudo apt-get install -y python-migrate python-eventlet python-gflags python-ipy python-tempita
+    sudo apt-get install -y python-libvirt python-libxml2 python-routes python-cheetah
+    sudo apt-get install -y python-netaddr python-paste python-pastedeploy python-glance
+
+    if [ "$USE_IPV6" == 1 ]; then
+        sudo apt-get install -y radvd
+        sudo bash -c "echo 1 > /proc/sys/net/ipv6/conf/all/forwarding"
+        sudo bash -c "echo 0 > /proc/sys/net/ipv6/conf/all/accept_ra"
+    fi
+
+    if [ "$USE_MYSQL" == 1 ]; then
+        cat <<MYSQL_PRESEED | debconf-set-selections
+mysql-server-5.1 mysql-server/root_password password $MYSQL_PASS
+mysql-server-5.1 mysql-server/root_password_again password $MYSQL_PASS
+mysql-server-5.1 mysql-server/start_on_boot boolean true
+MYSQL_PRESEED
+        apt-get install -y mysql-server python-mysqldb
+    fi
+    mkdir -p $DIR/images
+    wget -c http://images.ansolabs.com/tty.tgz
+    tar -C $DIR/images -zxf tty.tgz
+    exit
+fi
+
+NL=`echo -ne '\015'`
+
+function screen_it {
+    screen -S nova -X screen -t $1
+    screen -S nova -p $1 -X stuff "$2$NL"
+}
+
+if [ "$CMD" == "run" ]; then
+
   cat >$NOVA_DIR/bin/nova.conf << NOVA_CONF_EOF
 --verbose
 --nodaemon
@@ -66,61 +126,6 @@ if [ "$USE_IPV6" == 1 ]; then
         echo "--use_ipv6" >>$NOVA_DIR/bin/nova.conf
     fi
 
-if [ "$CMD" == "branch" ]; then
-    sudo apt-get install -y bzr
-    rm -rf $NOVA_DIR
-    bzr branch $SOURCE_BRANCH $NOVA_DIR
-    cd $NOVA_DIR
-    mkdir -p $NOVA_DIR/instances
-    mkdir -p $NOVA_DIR/networks
-fi
-
-# You should only have to run this once
-if [ "$CMD" == "install" ]; then
-    sudo apt-get install -y python-software-properties
-    sudo add-apt-repository ppa:nova-core/trunk
-    sudo apt-get update
-    sudo apt-get install -y dnsmasq-base kpartx kvm gawk iptables ebtables
-    sudo apt-get install -y user-mode-linux kvm libvirt-bin
-    sudo apt-get install -y screen euca2ools vlan curl rabbitmq-server
-    sudo apt-get install -y lvm2 iscsitarget open-iscsi
-    sudo apt-get install -y socat
-    echo "ISCSITARGET_ENABLE=true" | sudo tee /etc/default/iscsitarget
-    sudo /etc/init.d/iscsitarget restart
-    sudo modprobe kvm
-    sudo /etc/init.d/libvirt-bin restart
-    sudo modprobe nbd
-    sudo apt-get install -y python-twisted python-sqlalchemy python-mox python-greenlet python-carrot
-    sudo apt-get install -y python-daemon python-eventlet python-gflags python-ipy python-tempita
-    sudo apt-get install -y python-libvirt python-libxml2 python-routes python-cheetah
-    sudo apt-get install -y python-netaddr python-paste python-pastedeploy python-glance
-
-    if [ "$USE_IPV6" == 1 ]; then
-        sudo apt-get install -y radvd
-        sudo bash -c "echo 1 > /proc/sys/net/ipv6/conf/all/forwarding"
-        sudo bash -c "echo 0 > /proc/sys/net/ipv6/conf/all/accept_ra"
-    fi
-
-    if [ "$USE_MYSQL" == 1 ]; then
-        cat <<MYSQL_PRESEED | debconf-set-selections
-mysql-server-5.1 mysql-server/root_password password $MYSQL_PASS
-mysql-server-5.1 mysql-server/root_password_again password $MYSQL_PASS
-mysql-server-5.1 mysql-server/start_on_boot boolean true
-MYSQL_PRESEED
-        apt-get install -y mysql-server python-mysqldb
-    fi
-    wget -c http://c2477062.cdn.cloudfiles.rackspacecloud.com/images.tgz
-    tar -C $DIR -zxf images.tgz
-fi
-
-NL=`echo -ne '\015'`
-
-function screen_it {
-    screen -S nova -X screen -t $1
-    screen -S nova -p $1 -X stuff "$2$NL"
-}
-
-if [ "$CMD" == "run" ]; then
     killall dnsmasq
     if [ "$USE_IPV6" == 1 ]; then
        killall radvd

nova/db/api.py

@@ -71,7 +71,6 @@ class NoMoreTargets(exception.Error):
     """No more available blades"""
     pass
 
-
 ###################
 
 

nova/db/sqlalchemy/session.py

@@ -22,6 +22,7 @@ Session Handling for SQLAlchemy backend
 from sqlalchemy import create_engine
 from sqlalchemy.orm import sessionmaker
 
+from nova import exception
 from nova import flags
 
 FLAGS = flags.FLAGS
@@ -43,4 +44,6 @@ def get_session(autocommit=True, expire_on_commit=False):
                                 autocommit=autocommit,
                                 expire_on_commit=expire_on_commit))
     session = _MAKER()
+    session.query = exception.wrap_db_error(session.query)
+    session.flush = exception.wrap_db_error(session.flush)
     return session

nova/exception.py

@@ -80,6 +80,24 @@ class TimeoutException(Error):
     pass
 
 
+class DBError(Error):
+    """Wraps an implementation specific exception"""
+    def __init__(self, inner_exception):
+        self.inner_exception = inner_exception
+        super(DBError, self).__init__(str(inner_exception))
+
+
+def wrap_db_error(f):
+    def _wrap(*args, **kwargs):
+        try:
+            return f(*args, **kwargs)
+        except Exception, e:
+            LOG.exception(_('DB exception wrapped'))
+            raise DBError(e)
+    return _wrap
+    _wrap.func_name = f.func_name
+
+
 def wrap_exception(f):
     def _wrap(*args, **kw):
         try: