Caching

Available since @subsquid/graphql-server@3.2.0

The GraphQL API server provided by @subsquid/graphql-server supports caching via additional flags. It is done on a per-query basis. The whole response is cached for a specified amount of time (maxAge).

To enable caching when deploying to Aquarium, add the caching flags to cmd sections of the deployment manifest. Aquarium currently supports only in-memory cache, with Redis-based cache to be supported in the near future. For example, the snippet below will deploy a GraphQL API server with a 100Mb in-memory cache and invalidation time of 5 seconds:

squid.yaml

# ...
deploy:
  # other services ...
  api:
    cmd: [ "npx", "squid-graphql-server", "--dumb-cache", "in-memory", "--dumb-cache-ttl", "5000", "--dumb-cache-size", "100", "--dumb-cache-max-age", "5000" ]

Caching flags list is available via npx squid-graphql-server --help. Here are some more details on them:

--dumb-cache <cache-type>

Enables cache, either in-memory or redis. For redis, a Redis connection string must be set by a variable REDIS_URL. Aquarium deployments currently support only in-memory cache.

--dumb-cache-size <mb>

Cache max size. Applies only to in-memory cache.

--dumb-cache-max-age <ms>

A globally set max age in milliseconds. The cached queries are invalidated after that period of time.

--dumb-cache-ttl <ms>

Time-to-live for in-memory cache entries. Applies only to in-memory cache. The entries are eligible for eviction from the cache if not updated for longer than the time-to-live time.