formatted

Currently the python tests act as scripts. A lot of output is generated to stdout which makes it very hard to figure out where problems were. Also if you want to run only a single test you basically need to comment out code in order to accomplish this.

This PR modifies the python tests to us the pytest python testing framework. This framework allows individual tests to be targeted via the command line, without touching the source code. It also suppressed stdout by default making the test output much easier to read. Also after the tests run it will provide a summary of what failed, what succeded, etc.


Co-authored-by: CommanderKeynes <andrewjackson947@gmail.coma>
Co-authored-by: Andrew Jackson <andrewjackson2988@gmail.com>

.circleci/run_tests.sh

@@ -26,6 +26,7 @@ PGPASSWORD=sharding_user pgbench -h 127.0.0.1 -U sharding_user shard1 -i
 PGPASSWORD=sharding_user pgbench -h 127.0.0.1 -U sharding_user shard2 -i
 
 # Start Toxiproxy
+kill -9 $(pgrep toxiproxy) || true
 LOG_LEVEL=error toxiproxy-server &
 sleep 1
 
@@ -106,7 +107,7 @@ cd ../..
 # These tests will start and stop the pgcat server so it will need to be restarted after the tests
 #
 pip3 install -r tests/python/requirements.txt
-python3 tests/python/tests.py || exit 1
+pytest || exit 1
 
 
 #
@@ -177,3 +178,6 @@ killall pgcat -s SIGINT
 
 # Allow for graceful shutdown
 sleep 1
+
+kill -9 $(pgrep toxiproxy)
+sleep 1

.gitignore

@@ -10,4 +10,5 @@ lcov.info
 dev/.bash_history
 dev/cache
 !dev/cache/.keepme
-.venv
+.venv
+**/__pycache__

CONTRIBUTING.md

@@ -6,6 +6,32 @@ Thank you for contributing! Just a few tips here:
 2. Run the test suite (e.g. `pgbench`) to make sure everything still works. The tests are in `.circleci/run_tests.sh`.
 3. Performance is important, make sure there are no regressions in your branch vs. `main`.
 
+## How to run the integration tests locally and iterate on them
+We have integration tests written in Ruby, Python, Go and Rust.
+Below are the steps to run them in a developer-friendly way that allows iterating and quick turnaround.
+Hear me out, this should be easy, it will involve opening a shell into a container with all the necessary dependancies available for you and you can modify the test code and immediately rerun your test in the interactive shell.
+
+
+Quite simply, make sure you have docker installed and then run
+`./start_test_env.sh`
+
+That is it!
+
+Within this test environment you can modify the file in your favorite IDE and rerun the tests without having to bootstrap the entire environment again.
+
+Once the environment is ready, you can run the tests by running
+Ruby:   `cd /app/tests/ruby && bundle exec ruby <test_name>.rb --format documentation`
+Python: `cd /app/ && pytest`
+Rust:   `cd /app/tests/rust && cargo run`
+Go:     `cd /app/tests/go && /usr/local/go/bin/go test`
+
+You can also rebuild PgCat directly within the environment and the tests will run against the newly built binary
+To rebuild PgCat, just run `cargo build` within the container under `/app`
+
+![Animated gif showing how to run tests](https://github.com/user-attachments/assets/2258fde3-2aed-4efb-bdc5-e4f12dcd4d33)
+
+
+
 Happy hacking!
 
 ## TODOs

src/client.rs

@@ -346,6 +346,14 @@ where
         // Client is requesting to cancel a running query (plain text connection).
         CANCEL_REQUEST_CODE => Ok((ClientConnectionType::CancelQuery, bytes)),
 
+        // Client is requesting a GSS encoded connection
+        GSSENC_REQUEST_CODE => {
+            error_response_terminal(stream, "").await?;
+            Err(Error::ProtocolSyncError(
+                "PGCat does not support GSSAPI encoding".into(),
+            ))
+        }
+
         // Something else, probably something is wrong and it's not our fault,
         // e.g. badly implemented Postgres client.
         _ => Err(Error::ProtocolSyncError(format!(

src/constants.rs

@@ -11,6 +11,9 @@ pub const SSL_REQUEST_CODE: i32 = 80877103;
 // CancelRequest: the cancel request code.
 pub const CANCEL_REQUEST_CODE: i32 = 80877102;
 
+// GSSENCRequest: used to indicate we wants GSS connection
+pub const GSSENC_REQUEST_CODE: i32 = 80877104;
+
 // AuthenticationMD5Password
 pub const MD5_ENCRYPTED_PASSWORD: i32 = 5;
 

start_test_env.sh

@@ -0,0 +1,34 @@
+GREEN="\033[0;32m"
+RED="\033[0;31m"
+BLUE="\033[0;34m"
+RESET="\033[0m"
+
+
+cd tests/docker/
+docker compose kill main || true
+docker compose build main
+docker compose down
+docker compose up -d
+# wait for the container to start
+while ! docker compose exec main ls; do
+    echo "Waiting for test environment to start"
+    sleep 1
+done
+echo "==================================="
+docker compose exec -e LOG_LEVEL=error -d main toxiproxy-server
+docker compose exec --workdir /app main cargo build
+docker compose exec -d --workdir /app main ./target/debug/pgcat ./.circleci/pgcat.toml
+docker compose exec --workdir /app/tests/ruby main bundle install
+docker compose exec --workdir /app/tests/python main pip3 install -r requirements.txt
+echo "Interactive test environment ready"
+echo "To run integration tests, you can use the following commands:"
+echo -e "   ${BLUE}Ruby:   ${RED}cd /app/tests/ruby && bundle exec ruby tests.rb --format documentation${RESET}"
+echo -e "   ${BLUE}Python: ${RED}cd /app/ && pytest ${RESET}"
+echo -e "   ${BLUE}Rust:   ${RED}cd /app/tests/rust && cargo run ${RESET}"
+echo -e "   ${BLUE}Go:     ${RED}cd /app/tests/go && /usr/local/go/bin/go test${RESET}"
+echo "the source code for tests are directly linked to the source code in the container so you can modify the code and run the tests again"
+echo "You can rebuild PgCat from within the container by running"
+echo -e "  ${GREEN}cargo build${RESET}"
+echo "and then run the tests again"
+echo "==================================="
+docker compose exec --workdir /app/tests main bash

tests/docker/Dockerfile

@@ -2,7 +2,9 @@ FROM rust:bullseye
 
 COPY --from=sclevine/yj /bin/yj /bin/yj
 RUN /bin/yj -h
-RUN apt-get update && apt-get install llvm-11 psmisc postgresql-contrib postgresql-client ruby ruby-dev libpq-dev python3 python3-pip lcov curl sudo iproute2 -y
+RUN apt-get update && apt-get install llvm-11 psmisc postgresql-contrib postgresql-client ruby ruby-dev libpq-dev python3 python3-pip lcov curl sudo iproute2 gnupg lsb-release -y
+RUN env DEBIAN_FRONTEND=noninteractive apt-get -y install krb5-kdc krb5-admin-server krb5-user
+
 RUN cargo install cargo-binutils rustfilt
 RUN rustup component add llvm-tools-preview
 RUN sudo gem install bundler

tests/docker/docker-compose.yml

@@ -1,4 +1,3 @@
-version: "3"
 services:
   pg1:
     image: postgres:14
@@ -48,6 +47,8 @@ services:
   main:
     build: .
     command: ["bash", "/app/tests/docker/run.sh"]
+    environment:
+      - INTERACTIVE_TEST_ENVIRONMENT=true
     volumes:
       - ../../:/app/
       - /app/target/

tests/docker/run.sh

@@ -5,6 +5,38 @@ rm /app/*.profraw || true
 rm /app/pgcat.profdata || true
 rm -rf /app/cov || true
 
+# Prepares the interactive test environment
+# 
+if [ -n "$INTERACTIVE_TEST_ENVIRONMENT" ]; then
+    ports=(5432 7432 8432 9432 10432)
+    for port in "${ports[@]}"; do
+        is_it_up=0
+        attempts=0
+        while [ $is_it_up -eq 0 ]; do
+            PGPASSWORD=postgres psql -h 127.0.0.1 -p $port -U postgres -c '\q' > /dev/null 2>&1
+            if [ $? -eq 0 ]; then
+                echo "PostgreSQL on port $port is up."
+                is_it_up=1
+            else
+                attempts=$((attempts+1))
+                if [ $attempts -gt 10 ]; then
+                    echo "PostgreSQL on port $port is down, giving up."
+                    exit 1
+                fi
+                echo "PostgreSQL on port $port is down, waiting for it to start."
+                sleep 1
+            fi
+        done
+    done
+    PGPASSWORD=postgres psql -e -h 127.0.0.1 -p 5432  -U postgres -f /app/tests/sharding/query_routing_setup.sql
+    PGPASSWORD=postgres psql -e -h 127.0.0.1 -p 7432  -U postgres -f /app/tests/sharding/query_routing_setup.sql
+    PGPASSWORD=postgres psql -e -h 127.0.0.1 -p 8432  -U postgres -f /app/tests/sharding/query_routing_setup.sql
+    PGPASSWORD=postgres psql -e -h 127.0.0.1 -p 9432  -U postgres -f /app/tests/sharding/query_routing_setup.sql
+    PGPASSWORD=postgres psql -e -h 127.0.0.1 -p 10432 -U postgres -f /app/tests/sharding/query_routing_setup.sql
+    sleep 100000000000000000
+    exit 0
+fi
+
 export LLVM_PROFILE_FILE="/app/pgcat-%m-%p.profraw"
 export RUSTC_BOOTSTRAP=1
 export CARGO_INCREMENTAL=0

tests/python/requirements.txt

@@ -1,2 +1,3 @@
+pytest
 psycopg2==2.9.3
-psutil==5.9.1
+psutil==5.9.1

tests/python/test_krb.py

@@ -0,0 +1,94 @@
+import signal
+import socket
+import subprocess
+import utils
+
+REALM = 'EXAMPLE.COM'
+SUPPORTED_ENCRYPTION_TYPES = 'aes256-cts-hmac-sha1-96:normal'
+KADMIN_PRINCIPAL = 'root'
+KADMIN_PASSWORD = 'root'
+KDC_KADMIN_SERVER = socket.gethostname()
+
+LOGDIR = 'log'
+PG_LOG = f'{LOGDIR}/krb.log'
+# Assumes packages are installed; krb5-kdc and krb5-admin-server on debian
+KADMIN_PRINCIPAL_FULL = f'{KADMIN_PRINCIPAL}@{REALM}'
+MASTER_PASSWORD = 'master_password'
+
+
+def setup_krb():
+    krb5_conf = f"""
+[libdefaults]
+        default_realm = {REALM}
+        rdns = false
+
+[realms]
+        {REALM} = {{
+                kdc_ports = 88,750
+                kadmind_port = 749
+                kdc = {KDC_KADMIN_SERVER}
+                admin_server = {KDC_KADMIN_SERVER}
+        }}
+    """
+    with open("/etc/krb5.conf", "w") as text_file:
+        text_file.write(krb5_conf)
+
+    kdc_conf = f"""
+[realms]
+        {REALM} = {{
+                acl_file = /etc/krb5kdc/kadm5.acl
+                max_renewable_life = 7d 0h 0m 0s
+                supported_enctypes = {SUPPORTED_ENCRYPTION_TYPES}
+                default_principal_flags = +preauth
+        }}
+    """
+    with open("/etc/krb5kdc/kdc.conf", "w") as text_file:
+        text_file.write(kdc_conf)
+
+    kadm5_acl = f"""
+    {KADMIN_PRINCIPAL_FULL} *
+    """
+    with open("/etc/krb5kdc/kadm5.acl", "w") as text_file:
+        text_file.write(kadm5_acl)
+
+    kerberos_command = f"""
+    krb5_newrealm <<EOF
+    {MASTER_PASSWORD}
+    {MASTER_PASSWORD}
+    EOF
+    """
+    subprocess.run(kerberos_command, check=False, shell=True)
+
+    delete_principal = f'kadmin.local -q "delete_principal -force {KADMIN_PRINCIPAL_FULL}"'
+    subprocess.run(delete_principal, check=True, shell=True)
+
+    create_principal = f'kadmin.local -q "addprinc -pw {KADMIN_PASSWORD} {KADMIN_PRINCIPAL_FULL}"'
+    subprocess.run(create_principal, check=True, shell=True)
+
+    kinit_command = f'echo {KADMIN_PASSWORD} | kinit'
+    subprocess.run(kinit_command, check=True, shell=True)
+
+    utils.pgcat_start()
+
+
+def teardown_krb():
+    subprocess.run('kdestroy', check=True, shell=True)
+
+    delete_principal = f'kadmin.local -q "delete_principal -force {KADMIN_PRINCIPAL_FULL}"'
+    subprocess.run(delete_principal, check=True, shell=True)
+
+    utils.pg_cat_send_signal(signal.SIGINT)
+
+
+def test_krb():
+    setup_krb()
+    # TODO test connect to database
+
+    utils.pgcat_start()
+    conn, cur = utils.connect_db(autocommit=False)
+    cur.execute("SELECT 1")
+    res = cur.fetchall()
+    print(res)
+    utils.cleanup_conn(conn, cur)
+
+    teardown_krb()

tests/python/test_pgcat.py

@@ -1,83 +1,29 @@
-from typing import Tuple
-import psycopg2
-import psutil
 import os
 import signal
 import time
 
+import psycopg2
+
+import utils
+
 SHUTDOWN_TIMEOUT = 5
 
-PGCAT_HOST = "127.0.0.1"
-PGCAT_PORT = "6432"
-
-
-def pgcat_start():
-    pg_cat_send_signal(signal.SIGTERM)
-    os.system("./target/debug/pgcat .circleci/pgcat.toml &")
-    time.sleep(2)
-
-
-def pg_cat_send_signal(signal: signal.Signals):
-    try:
-        for proc in psutil.process_iter(["pid", "name"]):
-            if "pgcat" == proc.name():
-                os.kill(proc.pid, signal)
-    except Exception as e:
-        # The process can be gone when we send this signal
-        print(e)
-
-    if signal == signal.SIGTERM:
-        # Returns 0 if pgcat process exists
-        time.sleep(2)
-        if not os.system('pgrep pgcat'):
-            raise Exception("pgcat not closed after SIGTERM")
-
-
-def connect_db(
-    autocommit: bool = True,
-    admin: bool = False,
-) -> Tuple[psycopg2.extensions.connection, psycopg2.extensions.cursor]:
-
-    if admin:
-        user = "admin_user"
-        password = "admin_pass"
-        db = "pgcat"
-    else:
-        user = "sharding_user"
-        password = "sharding_user"
-        db = "sharded_db"
-
-    conn = psycopg2.connect(
-        f"postgres://{user}:{password}@{PGCAT_HOST}:{PGCAT_PORT}/{db}?application_name=testing_pgcat",
-        connect_timeout=2,
-    )
-    conn.autocommit = autocommit
-    cur = conn.cursor()
-
-    return (conn, cur)
-
-
-def cleanup_conn(conn: psycopg2.extensions.connection, cur: psycopg2.extensions.cursor):
-    cur.close()
-    conn.close()
-
-
 def test_normal_db_access():
-    pgcat_start()
-    conn, cur = connect_db(autocommit=False)
+    utils.pgcat_start()
+    conn, cur = utils.connect_db(autocommit=False)
     cur.execute("SELECT 1")
     res = cur.fetchall()
     print(res)
-    cleanup_conn(conn, cur)
+    utils.cleanup_conn(conn, cur)
 
 
 def test_admin_db_access():
-    conn, cur = connect_db(admin=True)
+    conn, cur = utils.connect_db(admin=True)
 
     cur.execute("SHOW POOLS")
     res = cur.fetchall()
     print(res)
-    cleanup_conn(conn, cur)
+    utils.cleanup_conn(conn, cur)
 
 
 def test_shutdown_logic():
@@ -86,17 +32,17 @@ def test_shutdown_logic():
     # NO ACTIVE QUERIES SIGINT HANDLING
 
     # Start pgcat
-    pgcat_start()
+    utils.pgcat_start()
 
     # Create client connection and send query (not in transaction)
-    conn, cur = connect_db()
+    conn, cur = utils.connect_db()
 
     cur.execute("BEGIN;")
     cur.execute("SELECT 1;")
     cur.execute("COMMIT;")
 
     # Send sigint to pgcat
-    pg_cat_send_signal(signal.SIGINT)
+    utils.pg_cat_send_signal(signal.SIGINT)
     time.sleep(1)
 
     # Check that any new queries fail after sigint since server should close with no active transactions
@@ -108,18 +54,18 @@ def test_shutdown_logic():
         # Fail if query execution succeeded
         raise Exception("Server not closed after sigint")
 
-    cleanup_conn(conn, cur)
-    pg_cat_send_signal(signal.SIGTERM)
+    utils.cleanup_conn(conn, cur)
+    utils.pg_cat_send_signal(signal.SIGTERM)
 
     # - - - - - - - - - - - - - - - - - -
     # NO ACTIVE QUERIES ADMIN SHUTDOWN COMMAND
 
     # Start pgcat
-    pgcat_start()
+    utils.pgcat_start()
 
     # Create client connection and begin transaction
-    conn, cur = connect_db()
-    admin_conn, admin_cur = connect_db(admin=True)
+    conn, cur = utils.connect_db()
+    admin_conn, admin_cur = utils.connect_db(admin=True)
 
     cur.execute("BEGIN;")
     cur.execute("SELECT 1;")
@@ -138,24 +84,24 @@ def test_shutdown_logic():
         # Fail if query execution succeeded
         raise Exception("Server not closed after sigint")
 
-    cleanup_conn(conn, cur)
-    cleanup_conn(admin_conn, admin_cur)
-    pg_cat_send_signal(signal.SIGTERM)
+    utils.cleanup_conn(conn, cur)
+    utils.cleanup_conn(admin_conn, admin_cur)
+    utils.pg_cat_send_signal(signal.SIGTERM)
 
     # - - - - - - - - - - - - - - - - - -
     # HANDLE TRANSACTION WITH SIGINT
 
     # Start pgcat
-    pgcat_start()
+    utils.pgcat_start()
 
     # Create client connection and begin transaction
-    conn, cur = connect_db()
+    conn, cur = utils.connect_db()
 
     cur.execute("BEGIN;")
     cur.execute("SELECT 1;")
 
     # Send sigint to pgcat while still in transaction
-    pg_cat_send_signal(signal.SIGINT)
+    utils.pg_cat_send_signal(signal.SIGINT)
     time.sleep(1)
 
     # Check that any new queries succeed after sigint since server should still allow transaction to complete
@@ -165,18 +111,18 @@ def test_shutdown_logic():
         # Fail if query fails since server closed
         raise Exception("Server closed while in transaction", e.pgerror)
 
-    cleanup_conn(conn, cur)
-    pg_cat_send_signal(signal.SIGTERM)
+    utils.cleanup_conn(conn, cur)
+    utils.pg_cat_send_signal(signal.SIGTERM)
 
     # - - - - - - - - - - - - - - - - - -
     # HANDLE TRANSACTION WITH ADMIN SHUTDOWN COMMAND
 
     # Start pgcat
-    pgcat_start()
+    utils.pgcat_start()
 
     # Create client connection and begin transaction
-    conn, cur = connect_db()
-    admin_conn, admin_cur = connect_db(admin=True)
+    conn, cur = utils.connect_db()
+    admin_conn, admin_cur = utils.connect_db(admin=True)
 
     cur.execute("BEGIN;")
     cur.execute("SELECT 1;")
@@ -194,30 +140,30 @@ def test_shutdown_logic():
         # Fail if query fails since server closed
         raise Exception("Server closed while in transaction", e.pgerror)
 
-    cleanup_conn(conn, cur)
-    cleanup_conn(admin_conn, admin_cur)
-    pg_cat_send_signal(signal.SIGTERM)
+    utils.cleanup_conn(conn, cur)
+    utils.cleanup_conn(admin_conn, admin_cur)
+    utils.pg_cat_send_signal(signal.SIGTERM)
 
     # - - - - - - - - - - - - - - - - - -
     # NO NEW NON-ADMIN CONNECTIONS DURING SHUTDOWN
     # Start pgcat
-    pgcat_start()
+    utils.pgcat_start()
 
     # Create client connection and begin transaction
-    transaction_conn, transaction_cur = connect_db()
+    transaction_conn, transaction_cur = utils.connect_db()
 
     transaction_cur.execute("BEGIN;")
     transaction_cur.execute("SELECT 1;")
 
     # Send sigint to pgcat while still in transaction
-    pg_cat_send_signal(signal.SIGINT)
+    utils.pg_cat_send_signal(signal.SIGINT)
     time.sleep(1)
 
     start = time.perf_counter()
     try:
-        conn, cur = connect_db()
+        conn, cur = utils.connect_db()
         cur.execute("SELECT 1;")
-        cleanup_conn(conn, cur)
+        utils.cleanup_conn(conn, cur)
     except psycopg2.OperationalError as e:
         time_taken = time.perf_counter() - start
         if time_taken > 0.1:
@@ -227,49 +173,49 @@ def test_shutdown_logic():
     else:
         raise Exception("Able connect to database during shutdown")
 
-    cleanup_conn(transaction_conn, transaction_cur)
-    pg_cat_send_signal(signal.SIGTERM)
+    utils.cleanup_conn(transaction_conn, transaction_cur)
+    utils.pg_cat_send_signal(signal.SIGTERM)
 
     # - - - - - - - - - - - - - - - - - -
     # ALLOW NEW ADMIN CONNECTIONS DURING SHUTDOWN
     # Start pgcat
-    pgcat_start()
+    utils.pgcat_start()
 
     # Create client connection and begin transaction
-    transaction_conn, transaction_cur = connect_db()
+    transaction_conn, transaction_cur = utils.connect_db()
 
     transaction_cur.execute("BEGIN;")
     transaction_cur.execute("SELECT 1;")
 
     # Send sigint to pgcat while still in transaction
-    pg_cat_send_signal(signal.SIGINT)
+    utils.pg_cat_send_signal(signal.SIGINT)
     time.sleep(1)
 
     try:
-        conn, cur = connect_db(admin=True)
+        conn, cur = utils.connect_db(admin=True)
         cur.execute("SHOW DATABASES;")
-        cleanup_conn(conn, cur)
+        utils.cleanup_conn(conn, cur)
     except psycopg2.OperationalError as e:
         raise Exception(e)
 
-    cleanup_conn(transaction_conn, transaction_cur)
-    pg_cat_send_signal(signal.SIGTERM)
+    utils.cleanup_conn(transaction_conn, transaction_cur)
+    utils.pg_cat_send_signal(signal.SIGTERM)
 
     # - - - - - - - - - - - - - - - - - -
     # ADMIN CONNECTIONS CONTINUING TO WORK AFTER SHUTDOWN
     # Start pgcat
-    pgcat_start()
+    utils.pgcat_start()
 
     # Create client connection and begin transaction
-    transaction_conn, transaction_cur = connect_db()
+    transaction_conn, transaction_cur = utils.connect_db()
     transaction_cur.execute("BEGIN;")
     transaction_cur.execute("SELECT 1;")
 
-    admin_conn, admin_cur = connect_db(admin=True)
+    admin_conn, admin_cur = utils.connect_db(admin=True)
     admin_cur.execute("SHOW DATABASES;")
 
     # Send sigint to pgcat while still in transaction
-    pg_cat_send_signal(signal.SIGINT)
+    utils.pg_cat_send_signal(signal.SIGINT)
     time.sleep(1)
 
     try:
@@ -277,24 +223,24 @@ def test_shutdown_logic():
     except psycopg2.OperationalError as e:
         raise Exception("Could not execute admin command:", e)
 
-    cleanup_conn(transaction_conn, transaction_cur)
-    cleanup_conn(admin_conn, admin_cur)
-    pg_cat_send_signal(signal.SIGTERM)
+    utils.cleanup_conn(transaction_conn, transaction_cur)
+    utils.cleanup_conn(admin_conn, admin_cur)
+    utils.pg_cat_send_signal(signal.SIGTERM)
 
     # - - - - - - - - - - - - - - - - - -
     # HANDLE SHUTDOWN TIMEOUT WITH SIGINT
 
     # Start pgcat
-    pgcat_start()
+    utils.pgcat_start()
 
     # Create client connection and begin transaction, which should prevent server shutdown unless shutdown timeout is reached
-    conn, cur = connect_db()
+    conn, cur = utils.connect_db()
 
     cur.execute("BEGIN;")
     cur.execute("SELECT 1;")
 
     # Send sigint to pgcat while still in transaction
-    pg_cat_send_signal(signal.SIGINT)
+    utils.pg_cat_send_signal(signal.SIGINT)
 
     # pgcat shutdown timeout is set to SHUTDOWN_TIMEOUT seconds, so we sleep for SHUTDOWN_TIMEOUT + 1 seconds
     time.sleep(SHUTDOWN_TIMEOUT + 1)
@@ -308,12 +254,5 @@ def test_shutdown_logic():
         # Fail if query execution succeeded
         raise Exception("Server not closed after sigint and expected timeout")
 
-    cleanup_conn(conn, cur)
-    pg_cat_send_signal(signal.SIGTERM)
-
-    # - - - - - - - - - - - - - - - - - -
-
-
-test_normal_db_access()
-test_admin_db_access()
-test_shutdown_logic()
+    utils.cleanup_conn(conn, cur)
+    utils.pg_cat_send_signal(signal.SIGTERM)

tests/python/utils.py

@@ -0,0 +1,60 @@
+from typing import Tuple
+import os
+import psutil
+import signal
+import time
+
+import psycopg2
+
+PGCAT_HOST = "127.0.0.1"
+PGCAT_PORT = "6432"
+
+def pgcat_start():
+    pg_cat_send_signal(signal.SIGTERM)
+    os.system("./target/debug/pgcat .circleci/pgcat.toml &")
+    time.sleep(2)
+
+
+def pg_cat_send_signal(signal: signal.Signals):
+    try:
+        for proc in psutil.process_iter(["pid", "name"]):
+            if "pgcat" == proc.name():
+                os.kill(proc.pid, signal)
+    except Exception as e:
+        # The process can be gone when we send this signal
+        print(e)
+
+    if signal == signal.SIGTERM:
+        # Returns 0 if pgcat process exists
+        time.sleep(2)
+        if not os.system('pgrep pgcat'):
+            raise Exception("pgcat not closed after SIGTERM")
+
+
+def connect_db(
+    autocommit: bool = True,
+    admin: bool = False,
+) -> Tuple[psycopg2.extensions.connection, psycopg2.extensions.cursor]:
+
+    if admin:
+        user = "admin_user"
+        password = "admin_pass"
+        db = "pgcat"
+    else:
+        user = "sharding_user"
+        password = "sharding_user"
+        db = "sharded_db"
+
+    conn = psycopg2.connect(
+        f"postgres://{user}:{password}@{PGCAT_HOST}:{PGCAT_PORT}/{db}?application_name=testing_pgcat",
+        connect_timeout=2,
+    )
+    conn.autocommit = autocommit
+    cur = conn.cursor()
+
+    return (conn, cur)
+
+
+def cleanup_conn(conn: psycopg2.extensions.connection, cur: psycopg2.extensions.cursor):
+    cur.close()
+    conn.close()