upda/_doc/Configuration.md

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# Configuration
The following table describe available configuration values.
| Variable | Purpose | Default/Description |
|:------------------------------------|:--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|:-------------------------------------------------------------------------------------------------------------------------------------|
| `SECRET` | A 32 character long secure random secret used for encrypting some data inside the database. When data has been created inside the database, the secret cannot be changed anymore, otherwise decryption fails. | Not set by default, you need to explicitly set it, e.g., generate via `openssl rand -hex 16` |
| `TZ` | The time zone (**recommended** to set it properly, background tasks depend on it) | Defaults to `Europe/Berlin`, can be any time zone according to _tz database_ |
| | | |
| `AUTH_MODE` | The auth mode. Possible values are `basic_single` and `basic_credentials` | Defaults to `basic_single` |
| `BASIC_AUTH_USER` | For auth mode `basic_single`: Username for login | Not set by default, you need to explicitly set it to user name |
| `BASIC_AUTH_PASSWORD` | For auth mode `basic_single`: User's password for login | Not set by default, you need to explicitly set it to a secure random |
| `BASIC_AUTH_CREDENTIALS` | For auth mode `basic_credentials`: list of comma separated credentials, e.g. `username1=password1,username2=password2` | Not set by default, you need to explicitly set it |
| | | |
| `DB_TYPE` | The database type (Postgres is **recommended**) | Defaults to `postgres`, possible values are `postgres` |
| `DB_SQLITE_FILE` | Path to the SQLITE file | Defaults to `<XDG_DATA_DIR>/upda/upda.db`, e.g. `~/.local/share/upda/upda.db` |
| `DB_POSTGRES_HOST` | The postgres host | Postgres host address, defaults to `localhost` |
| `DB_POSTGRES_PORT` | The postgres port | Postgres port, defaults to `5432` |
| `DB_POSTGRES_NAME` | The postgres database name | Postgres database name, needs to be set |
| `DB_POSTGRES_TZ` | The postgres time zone | Postgres time zone settings, defaults to `Europe/Berlin` |
| `DB_POSTGRES_USER` | The postgres user | Postgres user name, needs to be set |
| `DB_POSTGRES_PASSWORD` | The postgres password | Postgres user password, needs to be set |
| | | |
| `DB_MIGRATION_ENABLED` | See [database migration](#database-migration) for more detailed information. If `true` database migrations are executed; useful to disable when multiple instances are spawned | Defaults to `true`, possible values are `true` or `false` |
| | | |
| `SERVER_PORT` | Port | Defaults to `8080` |
| `SERVER_LISTEN` | Server's listen address | Defaults to empty which equals `0.0.0.0` |
| `SERVER_TLS_ENABLED` | If server uses TLS | Defaults `false` |
| `SERVER_TLS_CERT_PATH` | When TLS enabled, provide the certificate path | |
| `SERVER_TLS_KEY_PATH` | When TLS enabled, provide the key path | |
| `SERVER_TIMEOUT` | Timeout the server waits before shutting down to end any pending tasks | Defaults to `1s` (1 second), qualifier can be `s = second`, `m = minute`, `h = hour` prefixed with a positive number |
| `CORS_ALLOW_ORIGINS` | CORS configuration | Defaults to `*` |
| `CORS_ALLOW_METHODS` | CORS configuration | Defaults to `GET, POST, PUT, PATCH, DELETE, OPTIONS` |
| `CORS_ALLOW_HEADERS` | CORS configuration | Defaults to `Authorization, Content-Type` |
| `CORS_ALLOW_CREDENTIALS` | CORS configuration | Defaults to `true` |
| `CORS_EXPOSE_HEADERS` | CORS configuration | Defaults to `*` |
| | | |
| `LOGGING_LEVEL` | Logging level. Possible are `debug`, `info`, `warn`, `error`, `dpanic`, `panic`, `fatal`. Setting to `debug` enables high verbosity output. | Defaults to `info` |
| `LOGGING_ENCODING` | Logging encoding. Possible are `console` and `json` | Defaults to `json` |
| `LOGGING_DIRECTORY` | Logging directory. When set, logs will be added to a file called `upda.log` in addition to the standard output. Ensure that upda has access permissions. Use an external program for log rotation if desired. | |
| | | |
| `WEBHOOKS_TOKEN_LENGTH` | The length of the token | Defaults to `16`, positive number |
| | | |
| `TASK_UPDATE_CLEAN_STALE_ENABLED` | If background task should run to do housekeeping of stale (ignored/approved) updates from the database | Defaults to `false` |
| `TASK_UPDATE_CLEAN_STALE_INTERVAL` | Interval at which a background task does housekeeping by deleting stale (ignored/approved) updates from the database | Defaults to `1h` (1 hour), qualifier can be `s = second`, `m = minute`, `h = hour` prefixed with a positive number |
| `TASK_UPDATE_CLEAN_STALE_MAX_AGE` | Number defining at which age stale (ignored/approved) updates are deleted by the background task (_updatedAt_ attribute decides) | Defaults to `720h` (168 hours = 1 week), qualifier can be `s = second`, `m = minute`, `h = hour` prefixed with a positive number |
| | | |
| `TASK_EVENT_CLEAN_STALE_ENABLED` | If background task should run to do housekeeping of stale (old) events from the database | Defaults to `false` |
| `TASK_EVENT_CLEAN_STALE_INTERVAL` | Interval at which a background task does housekeeping by deleting stale (old) events from the database | Defaults to `8h` (8 hours), qualifier can be `s = second`, `m = minute`, `h = hour` prefixed with a positive number |
| `TASK_EVENT_CLEAN_STALE_MAX_AGE` | Number defining at which age stale (old) events are deleted by the background task (_updatedAt_ attribute decides) | Defaults to `2190h` (2190 hours = 3 months), qualifier can be `s = second`, `m = minute`, `h = hour` prefixed with a positive number |
| | | |
| `TASK_ACTIONS_ENQUEUE_ENABLED` | If background task should run to enqueue matching actions derived from events (actions are invocation separately after being enqueued) | Defaults to `true` |
| `TASK_ACTIONS_ENQUEUE_INTERVAL` | Interval at which a background task does check to enqueue actions | Defaults to `10s` (10 seconds), qualifier can be `s = second`, `m = minute`, `h = hour` prefixed with a positive number |
| `TASK_ACTIONS_ENQUEUE_BATCH_SIZE` | Number defining how many unhandled events are processed in a batch by the background task | Defaults to `1`, must be positive number |
| | | |
| `TASK_ACTIONS_INVOKE_ENABLED` | If background task should run to invoke enqueued actions derived | Defaults to `true` |
| `TASK_ACTIONS_INVOKE_INTERVAL` | Interval at which a background task does check to invoke enqueued actions | Defaults to `10s` (10 seconds), qualifier can be `s = second`, `m = minute`, `h = hour` prefixed with a positive number |
| `TASK_ACTIONS_INVOKE_BATCH_SIZE` | Number defining how many enqueued actions are processed in a batch by the background task | Defaults to `1`, must be positive number |
| `TASK_ACTIONS_INVOKE_MAX_RETRIES` | Number defining how often actions are invoked in case of an error, if exceeded, those actions are not retried again | Defaults to `3`, must be positive number |
| | | |
| `TASK_ACTIONS_CLEAN_STALE_ENABLED` | If background task should run to do housekeeping of stale (handled, meaning success or error state) actions from the database | Defaults to `true` |
| `TASK_ACTIONS_CLEAN_STALE_INTERVAL` | Interval at which a background task does housekeeping by deleting stale (handled) actions from the database | Defaults to `12h` (12 hours), qualifier can be `s = second`, `m = minute`, `h = hour` prefixed with a positive number |
| `TASK_ACTIONS_CLEAN_STALE_MAX_AGE` | Number defining at which age stale (handled) actions are deleted by the background task (_updatedAt_ attribute decides) | Defaults to `720h` (720 hours = 30 days), qualifier can be `s = second`, `m = minute`, `h = hour` prefixed with a positive number |
| | | |
| `TASK_PROMETHEUS_REFRESH_INTERVAL` | Interval at which a background task updates custom metrics | Defaults to `60s` (60 seconds), qualifier can be `s = second`, `m = minute`, `h = hour` prefixed with a positive number |
| | | |
| `LOCK_REDIS_ENABLED` | If locking via REDIS (multiple instances) is enabled. Requires REDIS. Otherwise uses in-memory locks. | Defaults to `false` |
| `LOCK_REDIS_URL` | If locking via REDIS is enabled, this should point to a resolvable REDIS instance, e.g. `redis://<user>:<pass>@localhost:6379/<db>`. | |
| | | |
| `PROMETHEUS_ENABLED` | If Prometheus metrics are exposed | Defaults to `false` |
| `PROMETHEUS_METRICS_PATH` | Defines the metrics endpoint path | Defaults to `/metrics` |
| `PROMETHEUS_SECURE_TOKEN_ENABLED` | If Prometheus metrics endpoint is protected by a token when enabled (**recommended**) | Defaults to `true` |
| `PROMETHEUS_SECURE_TOKEN` | The token securing the metrics endpoint when enabled (**recommended**) | Not set by default, you need to explicitly set it to a secure random |
| | | |
| `WEB_API_URL` | Base URL of API, e.g. `https://upda.domain.tld` | `http://localhost` |
| `WEB_TITLE` | The title of the frontend page | `upda` |
## Database migration
By default, _upda_ runs database migrations (`DB_MIGRATION_ENABLED`) to create the necessary database schema it uses.
You can disable this behavior by setting it to `false` which might be useful if you have multiple instances running and
only one should (regularly) update the database schema. Please make sure that this instance has the highest priority
when updating _upda_ and it should also start before all other (updated) instances start. If you have multiple instance
and keep the default that all instances run migrations, some instances might fail to start as they apply locking when
migrating database schema and conflict with other instances while migration is being executed.