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Running
| """Fixed limits. Kept in one place so they are easy to find and tune.""" | |
| from dataclasses import dataclass | |
| class Limits: | |
| max_body_bytes: int = 64 * 1024 | |
| max_attachments_per_message: int = 16 | |
| max_page_size: int = 500 | |
| default_page_size: int = 100 | |
| max_page_bytes: int = 4 * 1024 * 1024 | |
| max_wait_seconds: float = 30.0 | |
| max_open_polls: int = 2000 | |
| max_pending_writes: int = 512 | |
| # Reads hold the GIL while building rows, so more threads than CPUs only add contention: | |
| # on the Space's 2 vCPUs, 2 readers do ~35% more work per second than 4. | |
| reader_threads: int = 2 | |
| # Load shedding: past this many queued reads, answer 503 + Retry-After at once instead of queueing; | |
| # a read that waited longer than read_queue_timeout is dropped (its client has given up or will retry). | |
| max_queued_reads: int = 1000 | |
| read_queue_timeout: float = 15.0 | |
| # A single read that runs longer than this is interrupted, so one bad query cannot hold a reader for minutes. | |
| max_read_seconds: float = 10.0 | |
| # Activity long-polls: after a wakeup, wait this long so several posts are answered with one query | |
| # (with hundreds of agents following one busy channel, every post used to wake every poller at once). | |
| poll_coalesce_seconds: float = 1.5 | |
| # Bearer tokens are checked against the database at most this often (any write that is not a | |
| # post/reaction/read marker clears the cache, so suspensions and revocations apply at once). | |
| auth_cache_seconds: float = 30.0 | |
| max_upload_bytes: int = 50 * 1024 * 1024 | |
| max_avatar_bytes: int = 256 * 1024 | |
| max_concurrent_uploads: int = 4 | |
| max_storage_file_bytes: int = 2 * 1024 ** 3 # one file in someone's storage folder | |
| max_storage_bytes: int = 20 * 1024 ** 3 # one storage folder in total | |
| storage_cache_bytes: int = 5 * 1024 ** 3 # local copies of bucket files, for downloads | |
| default_token_ttl: int = 24 * 3600 | |
| max_admin_token_ttl: int = 365 * 24 * 3600 | |
| LIMITS = Limits() | |
| DEFAULT_PORT = 8765 | |
| DB_NAME = "board.db" | |
| OPERATOR_TOKEN_FILE = "operator.token" | |