DI-2029: Add SQLAlchemy DB type

Dockerfile

@@ -22,7 +22,7 @@ USER root
 
 # Install OS dependencies
 RUN apt-get update && \
-    apt-get install -y curl gcc python3-dev libpq-dev openjdk-11-jre postgresql-contrib
+    apt-get install -y curl gcc python3-dev libpq-dev openjdk-11-jre postgresql-contrib jq
 
 # Download all the Jars required to run Beeline
 RUN cd /opt && \
@@ -34,14 +34,14 @@ RUN cd /opt && \
 RUN cd /opt && \
     curl https://archive.apache.org/dist/hadoop/core/hadoop-$HADOOP_VERSION/hadoop-$HADOOP_VERSION.tar.gz -o hadoop-$HADOOP_VERSION.tar.gz && \
     tar -xzf hadoop-$HADOOP_VERSION.tar.gz && \
-    rm -rf apache-hive-bin.tar.gz
+    rm -rf hadoop-$HADOOP_VERSION.tar.gz
 
 # Download PrestoCli
 RUN mkdir /opt/presto-cli && \
     cd /opt/presto-cli && \
     curl https://repo1.maven.org/maven2/io/prestosql/presto-cli/$PRESTO_CLI_VERSION/presto-cli-$PRESTO_CLI_VERSION-executable.jar -o presto-cli && \
     chmod +x presto-cli
-
 
 # Install migratron
-RUN pip install migratron==$MIGRATRON_VERSION
+ADD . /opt/migratron
+RUN pip install -e /opt/migratron

docs/installation.rst

@@ -97,3 +97,8 @@ or locally, but a **very** basic guide is:
 
     export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64/
     export PATH=$PATH:$HIVE_HOME/bin
+
+SQLAlchemy
+==========
+
+For the SQLAlchemy option you only need to install the drivers needed for you particular URI.

migratron/VERSION

@@ -1 +1 @@
-2.1.0
+2.2.0

migratron/command/run_migration.py

@@ -9,6 +9,9 @@
 from logging import getLogger
 from datetime import datetime
 
+from sqlalchemy import create_engine
+from sqlalchemy.exc import ResourceClosedError
+
 from migratron.command.base import (
     BaseCommand,
     INSERT_MIGRATION_DATA,
@@ -236,6 +239,15 @@ def _execute_filename(self, file_content, complete_filename):
                 "-f",
                 complete_filename
             ]
+        elif self.db_type == "sqlalchemy":
+            engine = create_engine(self.db_uri)
+            with engine.connect() as conn:
+                cursor = conn.execute(file_content)
+                try:
+                    cursor.fetchall()  # Force non async execution
+                except ResourceClosedError:
+                    pass
+            command = None
         else:
             raise ValueError("Invalid database type")
 
@@ -248,8 +260,9 @@ def _execute_filename(self, file_content, complete_filename):
                 else:
                     command += [option, value]
 
-        try:
-            subprocess.check_call(command)
-        except Exception:
-            logger.exception("Error while running the migration: %s", complete_filename)
-            raise
+        if command is not None:
+            try:
+                subprocess.check_call(command)
+            except Exception:
+                logger.exception("Error while running the migration: %s", complete_filename)
+                raise

migratron/parsers.py

@@ -86,7 +86,7 @@ def create_run_migration_parser(subparser):
     )
     migrate_parser.add_argument(
         "--db-type",
-        choices=("postgresql", "hive", "presto"),
+        choices=("postgresql", "hive", "presto", "sqlalchemy"),
         required=False,
         default="postgresql",
         help=(

requirements.txt

@@ -1,3 +1,4 @@
 pygments
-psycopg2
+psycopg2-binary
 six
+sqlalchemy

tests/commands/test_run_migration.py

@@ -3,6 +3,9 @@
 import os
 import subprocess
 import unittest
+from tempfile import NamedTemporaryFile
+
+import sqlalchemy
 
 from .helper import BaseHelper, invalid_dbname
 from migratron.command.initialize import CREATE_TABLE_SQL
@@ -131,3 +134,36 @@ def _drop_tables(self):
                 "DROP TABLE IF EXISTS %s" % table_name
             ]
             subprocess.check_call(command)
+
+
+class SQLAlchemyRunMigrationTest(BaseRunMigration):
+
+    @classmethod
+    def setUpClass(cls):
+        cls.dbfile = NamedTemporaryFile()
+        cls.database_uri = "sqlite:///" + cls.dbfile.name
+        cls.engine = sqlalchemy.create_engine(cls.database_uri)
+
+        super(BaseRunMigration, cls).setUpClass()
+
+    @classmethod
+    def tearDownClass(cls):
+        cls.dbfile.close()
+
+    def create_command(self):
+        command = RunMigrationCommand(
+            migration_type=ALL_MIGRATION_TYPES,
+            just_list_files=False,
+            additional_options=None,
+            db_type="sqlalchemy",
+            db_uri=self.database_uri,
+            **self.BASE_ARGS
+        )
+        return command
+
+    def _check_table_exist(self, table_name):
+        return sqlalchemy.inspect(self.engine).has_table(table_name)
+
+    def _drop_tables(self):
+        for table_name in ['t0', 't1']:
+            self.engine.execute(sqlalchemy.text("DROP TABLE IF EXISTS %s" % table_name))