Configuration

Three ways to configure YokedCache: programmatic, YAML, or environment variables. They compose together—explicit arguments beat CacheConfig, which beats YAML, which beats env vars, which beats defaults.

Programmatic

from yokedcache import YokedCache
from yokedcache.config import CacheConfig

config = CacheConfig(
    redis_url="redis://localhost:6379/0",
    default_ttl=300,
    key_prefix="myapp",
)
cache = YokedCache(config)

From environment variables

cache = YokedCache.from_env()

Reads all YOKEDCACHE_* env vars automatically.

From YAML

cache = YokedCache.from_yaml("cache.yaml")

# cache.yaml
redis_url: redis://localhost:6379/0
default_ttl: 300
key_prefix: myapp
enable_fuzzy: true
log_level: INFO

tables:
  users:
    ttl: 3600
    tags: ["user_data"]
  products:
    ttl: 1800
    serialization_method: MSGPACK

Full reference

Connection

Field	Type	Default	Env var	Notes
`redis_url`	`str \\| None`	`None`	`YOKEDCACHE_REDIS_URL`	Falls back to memory backend if `None`
`max_connections`	`int`	`50`	`YOKEDCACHE_MAX_CONNECTIONS`	Redis connection pool size
`connection_timeout`	`int`	`30`	`YOKEDCACHE_CONNECTION_TIMEOUT`	Seconds
`connection_pool_kwargs`	`dict`	`{}`	—	Passed directly to `redis-py`

redis_url formats:

redis://localhost:6379/0
redis://:password@host:6379/0
redis://username:password@host:6379/0
rediss://host:6380/0                          ← TLS
redis+sentinel://s1:26379,s2:26379/master/0  ← Sentinel

connection_pool_kwargs common options:

connection_pool_kwargs={
    "socket_connect_timeout": 5,    # seconds to establish connection
    "socket_timeout": 5,            # seconds for read/write operations
    "socket_keepalive": True,       # keep idle connections alive
    "retry_on_timeout": True,       # retry on socket timeout
    "health_check_interval": 30,    # background connection health ping (s)
    "ssl_cert_reqs": "required",    # TLS cert validation
    "ssl_ca_certs": "/path/to/ca",  # CA certificate path
}

Cache behavior

Field	Type	Default	Env var
`default_ttl`	`int`	`300`	`YOKEDCACHE_DEFAULT_TTL`
`key_prefix`	`str`	`"yokedcache"`	`YOKEDCACHE_KEY_PREFIX`
`default_serialization`	`SerializationMethod`	`JSON`	`YOKEDCACHE_DEFAULT_SERIALIZATION`
`ttl_jitter_percent`	`float`	`10.0`	—
`allow_legacy_insecure_deserialization`	`bool`	`True`	—

ttl_jitter_percent: Adds randomness to TTL to prevent cache stampedes. At 10.0, a 300s TTL becomes 270–330s. Set to 0 to disable.

allow_legacy_insecure_deserialization: Set to False once you've migrated away from 0.x cache entries. Improves security by rejecting blobs that weren't written with the typed envelope format introduced in 1.0.0.

Resilience

Field	Type	Default	Env var
`fallback_enabled`	`bool`	`True`	`YOKEDCACHE_FALLBACK_ENABLED`
`connection_retries`	`int`	`3`	`YOKEDCACHE_CONNECTION_RETRIES`
`retry_delay`	`float`	`0.1`	—
`enable_circuit_breaker`	`bool`	`False`	`YOKEDCACHE_ENABLE_CIRCUIT_BREAKER`
`circuit_breaker_failure_threshold`	`int`	`5`	—
`circuit_breaker_timeout`	`float`	`60.0`	—

See Resilience for detailed behavior.

Memory backend

Field	Type	Default
`memory_max_size`	`int`	`10000`
`memory_cleanup_interval`	`int`	`300`

Only applies when no redis_url is set.

Features

Field	Type	Default	Env var
`enable_fuzzy`	`bool`	`False`	`YOKEDCACHE_ENABLE_FUZZY`
`fuzzy_threshold`	`int`	`80`	`YOKEDCACHE_FUZZY_THRESHOLD`
`enable_compression`	`bool`	`False`	`YOKEDCACHE_ENABLE_COMPRESSION`
`compression_threshold`	`int`	`1024`	—

Fuzzy search requires pip install "yokedcache[fuzzy]".
Compression uses zlib. Values smaller than compression_threshold bytes are not compressed.

Logging

Field	Type	Default	Env var
`log_level`	`str`	`"INFO"`	`YOKEDCACHE_LOG_LEVEL`

YokedCache logs under the yokedcache logger. To customize:

import logging
logging.getLogger("yokedcache").setLevel(logging.DEBUG)

Metrics

Field	Type	Default	Env var
`enable_metrics`	`bool`	`False`	`YOKEDCACHE_ENABLE_METRICS`
`prometheus_port`	`int`	`8000`	`YOKEDCACHE_PROMETHEUS_PORT`
`statsd_host`	`str \\| None`	`None`	`YOKEDCACHE_STATSD_HOST`
`statsd_port`	`int`	`8125`	`YOKEDCACHE_STATSD_PORT`

Per-table configuration

Different tables can have different TTLs, serialization, tags, and feature settings:

from yokedcache.config import CacheConfig, TableCacheConfig
from yokedcache.models import SerializationMethod

config = CacheConfig(
    default_ttl=300,
    tables={
        "users": TableCacheConfig(
            ttl=3600,                                    # 1 hour (overrides default)
            tags={"user_data"},                          # auto-applied to all reads
            serialization_method=SerializationMethod.JSON,
            enable_fuzzy=True,
            fuzzy_threshold=85,
        ),
        "sessions": TableCacheConfig(
            ttl=900,                                     # 15 min
            tags={"session_data"},
        ),
        "products": TableCacheConfig(
            ttl=7200,                                    # 2 hours
            serialization_method=SerializationMethod.MSGPACK,
            enable_compression=True,
            compression_threshold=512,
        ),
        "analytics": TableCacheConfig(
            ttl=60,                                      # 1 min—fresh data matters
            enable_fuzzy=False,
        ),
    }
)

`TableCacheConfig` fields

Field	Type	Description
`ttl`	`int`	TTL for this table (overrides `default_ttl`)
`tags`	`set[str]`	Tags automatically applied to all entries for this table
`serialization_method`	`SerializationMethod`	Overrides `default_serialization`
`enable_fuzzy`	`bool`	Overrides `enable_fuzzy`
`fuzzy_threshold`	`int`	Overrides `fuzzy_threshold`
`enable_compression`	`bool`	Overrides `enable_compression`
`compression_threshold`	`int`	Overrides `compression_threshold`
`query_specific_ttls`	`dict[str, int]`	Map specific SQL patterns to TTLs

Query-specific TTLs:

"analytics": TableCacheConfig(
    ttl=300,
    query_specific_ttls={
        "SELECT COUNT(*) FROM analytics": 30,       # count is cheap to refresh
        "SELECT * FROM analytics WHERE date = ?": 3600,  # historical data is stable
    },
)

Environment-specific configs

A clean pattern for dev/staging/prod:

import os
from yokedcache import YokedCache
from yokedcache.config import CacheConfig

env = os.getenv("ENV", "development")

configs = {
    "development": CacheConfig(
        # No redis_url — use memory for fast local dev
        default_ttl=60,
        key_prefix="dev_myapp",
        log_level="DEBUG",
    ),
    "testing": CacheConfig(
        # Also memory, but separate prefix to avoid polluting dev data
        default_ttl=30,
        key_prefix="test_myapp",
        log_level="WARNING",
    ),
    "production": CacheConfig(
        redis_url=os.environ["REDIS_URL"],
        default_ttl=300,
        key_prefix="prod_myapp",
        max_connections=50,
        enable_circuit_breaker=True,
        allow_legacy_insecure_deserialization=False,
        log_level="WARNING",
        enable_metrics=True,
    ),
}

cache = YokedCache(configs[env])

Exporting configuration

Dump the active config for inspection or backup:

config_dict = cache.config.to_dict()
config_yaml = cache.config.to_yaml()

CLI:

yokedcache export-config --output config.yaml
yokedcache export-config --format json

Validation

YokedCache validates the config at startup and raises ConfigValidationError for invalid values (negative TTL, bad URL format, etc.):

from yokedcache.exceptions import ConfigValidationError

try:
    config = CacheConfig(default_ttl=-1)
except ConfigValidationError as e:
    print(e)  # "default_ttl must be a positive integer"