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@@ -12,24 +12,13 @@ context manager:
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async with RedisDB(host="localhost") as kv:
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await kv.incr("hits")
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lifecycle: construction is sync, opens no socket (pool connects lazily). connect()
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pings so bad host/port/auth fails loud immediately, returns self. close() tears
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down client + pool (client.aclose() + pool.disconnect()). a failed connect()/
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__aenter__ ping also disconnects the pool before re-raising, so a discarded
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RedisDB from a failed `async with` doesn't hold a live pool.
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type contract: decode_responses=True by default -> str values, None for absent key.
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decode_responses=False for raw bytes. counters (incr/decr/exists/ttl) always int.
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errors (FAIL LOUD — unlike mongo's swallow-and-default): every wrapped method catches
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RedisError, logs via getLogger(__name__), re-raises. None/[]/{} is only ever a
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real result, never a swallowed failure. unwrapped ops (pipelines, pub/sub, scan,
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Lua, ...) go through the raw `.client` escape hatch: full driver surface, raises.
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fail loud: wrapped methods catch RedisError, log, and re-raise; see each method's
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docstring for its own contract. unwrapped ops go through the raw `.client` escape
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hatch: full driver surface, raises.
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notes:
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- import is `redis_store`; repo is `redis`, distribution is `redis_store` (the
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driver owns the `redis` import name, so the package can't also be `redis`)
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- pub/sub and pipeline helpers intentionally not wrapped yet — use `.client`
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- ssl=True maps to connection_class=redis.asyncio.SSLConnection so TLS works via
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the documented pool_kwargs path; pass ssl-prefixed kwargs alongside it
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(ssl_ca_certs, ssl_certfile, ...) to configure the handshake
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@@ -61,26 +50,14 @@ class RedisDB:
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):
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"""build the (not-yet-connected) pool + client; no I/O happens here
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host/port/db/password/max_connections injected by the caller. extra
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pool_kwargs pass through to the connection pool (socket_timeout,
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socket_connect_timeout, ssl, etc). decode_responses=True returns str, False
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raw bytes.
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uses a BlockingConnectionPool so callers wait up to pool_timeout seconds for a
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free connection instead of raising MaxConnectionsError immediately.
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a BlockingConnectionPool is used so callers WAIT up to pool_timeout seconds
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for a free connection under concurrency exceeding max_connections (matching
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motor/mongo's blocking pool), instead of raising MaxConnectionsError
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immediately. pool_timeout=None waits forever.
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`timeout` is the pool's own kwarg (filled from pool_timeout here); passing it
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in pool_kwargs would collide, so it's rejected with a clear ValueError instead
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of a cryptic driver "multiple values for 'timeout'".
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`ssl=True` maps to `connection_class=redis.asyncio.SSLConnection` — the
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default async Connection class has no `ssl` parameter, so passing it straight
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through pool_kwargs would defer the failure to connect() as a raw TypeError.
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pass ssl-prefixed kwargs (ssl_ca_certs, ssl_certfile, ...) alongside ssl=True
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to configure TLS; an explicit connection_class in pool_kwargs is left
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untouched.
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`timeout` in pool_kwargs collides with pool_timeout, so it's rejected with a
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clear ValueError. `ssl=True` maps to `connection_class=redis.asyncio.SSLConnection`
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since the default Connection class has no `ssl` parameter (pass ssl-prefixed
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kwargs alongside it to configure TLS; an explicit connection_class is left
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untouched).
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"""
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if "timeout" in pool_kwargs:
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raise ValueError(
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@@ -116,18 +93,26 @@ class RedisDB:
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return self
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async def close(self) -> None:
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"""close the client and disconnect the pool on shutdown"""
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"""close the client and disconnect the pool on shutdown
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the pool disconnect always runs, even if the client close raises, so a
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failure in one does not leak the other's resources.
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"""
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try:
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await self._client.aclose()
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await self._pool.disconnect()
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try:
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await self._client.aclose()
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finally:
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await self._pool.disconnect()
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except RedisError:
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log.exception("redis.close()")
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raise
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async def __aenter__(self) -> "RedisDB":
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"""enter: connect() and return self"""
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return await self.connect()
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async def __aexit__(self, exc_type, exc, tb) -> None:
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"""exit: close(), ignoring exc_type/exc/tb"""
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await self.close()
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@property
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@@ -138,9 +123,6 @@ class RedisDB:
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"""
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return self._client
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# -------------------------------------------------------------------------
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# key / value
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async def get(self, key: str) -> Optional[str]:
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"""return the string value at key, or None if the key is absent"""
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try:
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@@ -189,9 +171,6 @@ class RedisDB:
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log.exception("redis.decr(%s)", key)
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raise
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# -------------------------------------------------------------------------
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# hash
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async def hget(self, name: str, field: str) -> Optional[str]:
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"""return the value of field in hash name, or None if either is absent"""
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try:
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@@ -227,9 +206,6 @@ class RedisDB:
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log.exception("redis.hdel(%s)", name)
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raise
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# -------------------------------------------------------------------------
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# expiry / ttl
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async def expire(self, key: str, seconds: int) -> bool:
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"""set a ttl of seconds on key; returns False if the key does not exist"""
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try:
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