Database¶

About¶

We use CouchDB because it's a simple document-oriented NoSQL database. The database has two main purposes:

Saving test report;
Data synchronization with the web interface.

The CouchDB version must be equal to or greater than the 3.2 version.

Database in pytest-hardpy¶

Description of databases¶

The pytest plugin has 2 databases: statestore and runstore.

The statestore database uses for frontend data synchronization.
The runstore database contains the document current, which is a JSON object that stores the current state of the test run.

A separate database is required to store the list of reports. The report database is used as an example of storing reports on past testing runs. It can be launched in the same instance as the statestore, runstore database, or in a different one. The database is accessed through the CouchdbLoader class, which can be called at the end of each launch. To read the current report, use the get_current_report() function.

Sample code for saving a report at the end of testing:

# conftest.py
def save_report_to_couchdb():
    report = get_current_report()
    if report:
        loader = CouchdbLoader(CouchdbConfig())
        loader.load(report)


@pytest.fixture(scope="session", autouse=True)
def fill_actions_after_test(post_run_functions: list):
    post_run_functions.append(save_report_to_couchdb)
    yield

HardPy users have the flexibility to choose their preferred database. They can write custom classes to record reports at the end of testing.

Runstore scheme¶

The runstore and report databases have the same schema, as runstore stores the current report and report stores reports.

The current document of runstore database contains the following fields:

_rev: current document revision;
_id: unique document identifier;
stop_time: end time of testing in Unix seconds;
start_time: testing start time in Unix seconds;
status: test execution status;
name: test suite name;
dut: DUT information containing the serial number and additional information;
test_stand: information about the test stand in the form of a dictionary;
artifact: an object containing information about artifacts created during the test run;
modules: module information.

The test_stand block containt the following fields:

name - test stand name;
drivers: information about drivers in the form of a dictionary;
info: a dictionary containing additional information about the test stand;
timezone: timezone as a string;
location: test stand location;
hw_id: test stand machine id (GUID) or MAC address.

The dut block contains the following fields:

serial_number: DUT serial number;
part_number: DUT part number;
info: A dictionary containing additional information about the DUT, such as batch, board revision, etc.

The modules block contains the following fields:

test_{module_name}: an object containing information about a specific module. Contains the following fields:
- status: module test execution status;
- name: module name, by default the same as module_id;
- start_time: module testing start time in Unix seconds;
- stop_time: end time of module testing in Unix seconds;
- artifact: an object containing information about artifacts created during the test module process;
- cases: an object containing information about each test within the module. Contains the following fields:
- test_{test_name}: an object containing information about the test. Contains the following fields:
  - status: test execution status;
  - name: test name, by default the same as case_id;
  - start_time: test start time in Unix seconds;
  - stop_time: test end time in Unix second;
  - assertion_msg: error message if the test fails;
  - msg: additional message;
  - artifact: an object containing information about artifacts created during the test case process.

Example of a current document:

    {
      "_rev": "44867-3888ae85c19c428cc46685845953b483",
      "_id": "current",
      "stop_time": 1695817266,
      "start_time": 1695817263,
      "status": "failed",
      "name": "hardpy-stand",
      "dut": {
        "serial_number": "92c5a4bb-ecb0-42c5-89ac-e0caca0919fd",
        "part_number": "part_1",
        "info": {
          "batch": "test_batch",
          "board_rev": "rev_1"
        }
      },
      "test_stand": {
        "hw_id": "840982098ca2459a7b22cc608eff65d4",
        "name": "test_stand_1",
        "info": {
          "geo": "Belgrade"
        },
        "timezone": "Europe/Belgrade",
        "drivers": {
          "driver_1": "driver info",
          "driver_2": {
            "state": "active",
            "port": 8000
          }
        },
        "location": "Belgrade_1"
      },
      "artifact": {},
      "modules": {
        "test_1_a": {
          "status": "failed",
          "name": "Module 1",
          "start_time": 1695816884,
          "stop_time": 1695817265,
          "artifact": {},
          "cases": {
            "test_dut_info": {
              "status": "passed",
              "name": "DUT info",
              "start_time": 1695817263,
              "stop_time": 1695817264,
              "assertion_msg": null,
              "msg": null,
              "artifact": {}
            },
            "test_minute_parity": {
              "status": "failed",
              "name": "Test 1",
              "start_time": 1695817264,
              "stop_time": 1695817264,
              "assertion_msg": "The test failed because minute 21 is odd! Try again!",
              "msg": [
                "Current minute 21"
              ],
              "artifact": {
                "data_str": "123DATA",
                "data_int": 12345,
                "data_dict": {
                  "test_key": "456DATA"
                }
              }
            }
          }
        }
      }
    }

CouchDB instance¶

This section explains how to launch and manage a CouchDB instance. After launching the database, it becomes available at the following address:

http://localhost:5984/_utils/

The internal settings of the database are contained in the couchDB.ini configuration file. It contains settings that define the behavior and operating parameters of the database.

Running CouchDB with Docker Compose¶

An example configuration for running CouchDB via Docker Compose is located in the example/database/couchdb folder. A shortened version of the instructions is described below.

Create a docker directory in the project's root directory.
Create a couchdb.ini file in the docker directory.

[chttpd]
enable_cors=true

[cors]
origins = *
methods = GET, PUT, POST, HEAD, DELETE
credentials = true
headers = accept, authorization, content-type, origin, referer, x-csrf-token

3. Create a docker-compose.yaml file in project's root directory.

version: "3.8"

services:
  couchserver:
    image: couchdb:3.4
    ports:
      - "5984:5984"
    environment:
      COUCHDB_USER: dev
      COUCHDB_PASSWORD: dev
    volumes:
      - ./docker/dbdata:/opt/couchdb/data
      - ./docker/couchdb.ini:/opt/couchdb/etc/local.ini

4. Run docker compose in the root directory.

docker compose up

5. To stop the database, run the command:

docker compose down

Running CouchDB with Docker¶

Create couchdb.ini file.

[chttpd]
enable_cors=true

[cors]
origins = *
methods = GET, PUT, POST, HEAD, DELETE
credentials = true
headers = accept, authorization, content-type, origin, referer, x-csrf-token

2. The Docker version must be 24.0.0 or higher. Run the Docker container (from the folder with the couchdb.ini file):

docker run --rm --name couchdb -p 5984:5984 -e COUCHDB_USER=dev -e COUCHDB_PASSWORD=dev -v ./couchdb.ini:/opt/couchdb/etc/local.ini couchdb:3.4

Command for Windows:

docker run --rm --name couchdb -p 5984:5984 -e COUCHDB_USER=dev -e COUCHDB_PASSWORD=dev -v .\couchdb.ini:/opt/couchdb/etc/local.ini couchdb:3.4

The container will be deleted after use.

Running CouchDB with binary packages in Linux¶

Use this instruction to install CouchDB.
The installer asks you if you want to install CouchDB as a standalone application or in a clustered configuration. Select Standalone and press Enter.
You are prompted to enter the Erlang Node Name. You can ask it in Terminal with the command hostname -f.
Set the Erlang Magic Cookie. This is a unique identifier, for example, test1234.
Configure the network interfaces on which CouchDB will be bound localhost is fine.
Enter an admin password of your choice for CouchDB, press Enter, re-type the password and press Enter again to continue the installation.
After launching the database, it becomes available at the following address http://localhost:5984/_utils/. Open it.
First of all, in the User Management section in the Create Admins tab, create a user with the login dev and password dev.
In the Config choose CORS and appoint Enable CORS with All domains.

To disable the CouchDB service:¶

Remove packages:

sudo apt remove --purge couchdb

Remove GPG keys and repository:

sudo rm /usr/share/keyrings/couchdb-archive-keyring.gpg
sudo rm /etc/apt/sources.list.d/couchdb.list

Clean APT cache:

sudo apt clean

Disable service:

systemctl stop couchdb.service
systemctl disable couchdb.service
systemctl daemon-reload
systemctl reset-failed

Running CouchDB with binary packages in Windows¶

Use this instruction to install CouchDB.
Be sure to install CouchDB to a path with no spaces, such as C:\CouchDB.
Create a user with the login dev and password dev during the installation steps. Validate Credentials.
Generate Random Cookie.
After launching the database, it becomes available at the following address http://localhost:5984/_utils/. Open it.
In the Config choose CORS and appoint Enable CORS with All domains.