HTTP — Cache (RFC7234) middleware

Cache middleware implements http-caching RFC 7234. It's based on the Souin HTTP cache library.

Have a look at the Souin documentation if you need more information.

Warning
This is a third party plugin and isn't included by default. See the Building RoadRunner with Cache section for more information.

#Features

• RFC 7234 compliant HTTP Cache.

Sets the Cache-Status HTTP Response Header

• REST API to purge the cache and list stored resources.
• Builtin support for distributed cache.
• Tag-based invalidation.
• Partial GraphQL caching.
• Configure multiple HTTP verbs to cache (especially for GraphQL).
• Builtin timeout.

#Building RoadRunner with Cache

As it's based on the Souin HTTP cache library we can use directly the roadrunner middleware implementation. We have to set the folder property because this middleware is located in a subdirectory.

[github]
[github.token]
token = "YOUR_GH_TOKEN"

[github.plugins]
# Use the Souin third-party middleware.
cache = { ref = "master", owner = "darkweak", repository = "souin", folder = "/plugins/roadrunner" }
# others ...

[log]
level = "debug"
mode = "development"

Available storages:
In-memory/Filesystem

• nutsdb
• badger (default one)

Distributed

• etcd
• olric

More info about customizing RR with your own plugins: link

#Configuration

You can set each Souin configuration key under the http.cache key. There is a configuration example below.

http:
  # Other http sub keys
  cache:
    api:
      basepath: /httpcache_api
      prometheus:
        basepath: /anything-for-prometheus-metrics
      souin: { }
    default_cache:
      allowed_http_verbs:
        - GET
        - POST
        - HEAD
      cdn:
        api_key: XXXX
        dynamic: true
        hostname: XXXX
        network: XXXX
        provider: fastly
        strategy: soft
      headers:
        - Authorization
      regex:
        exclude: '/excluded'
      timeout:
        backend: 5s
        cache: 1ms
      ttl: 5s
      stale: 10s
    log_level: debug
    ykeys:
      The_First_Test:
        headers:
          Content-Type: '.+'
      The_Second_Test:
        url: 'the/second/.+'
    surrogate_keys:
      The_First_Test:
        headers:
          Content-Type: '.+'
      The_Second_Test:
        url: 'the/second/.+'
  middleware:
    - cache
    # Other middlewares

Detailed configuration

the provider | XXXX | | cdn.hostname | The hostname if required, depending the provider | domain.com | | cdn.network | The network if required, depending the provider | your_network | | cdn.strategy | The strategy to use to purge the cdn cache, soft will keep the content as a stale resource | hard

(default: soft) | | cdn.service_id | The service id if required, depending the provider | 123456_id | | cdn.zone_id | The zone id if required, depending the provider | anywhere_zone | | default_cache.allowed_http_verbs | The HTTP verbs to support cache | - GET

- POST

(default: GET, HEAD) | | default_cache.badger | Configure the Badger cache storage | | | default_cache.badger.path | Configure Badger with a file | /anywhere/badger_configuration.json | | default_cache.badger.configuration | Configure Badger directly in the Caddyfile or your JSON caddy configuration | See the Badger configuration for the options | | default_cache.etcd | Configure the Etcd cache storage | | | default_cache.etcd.configuration | Configure Etcd directly in the Caddyfile or your JSON caddy configuration | See the Etcd configuration for the options | | default_cache.headers | List of headers to include to the cache | - Authorization

- Content-Type

- X-Additional-Header | | default_cache.key | Override the key generation with the ability to disable unnecessary parts | | | default_cache.key.disable_body | Disable the body part in the key (GraphQL context) | true

(default: false) | | default_cache.key.disable_host | Disable the host part in the key | true

(default: false) | | default_cache.key.disable_method | Disable the method part in the key | true

(default: false) | | default_cache.etcd | Configure the Etcd cache storage | | | default_cache.etcd.configuration | Configure Etcd directly in the Caddyfile or your JSON caddy configuration | See the Etcd configuration for the options | | default_cache.nuts | Configure the Nuts cache storage | | | default_cache.nuts.path | Set the Nuts file path storage | /anywhere/nuts/storage | | default_cache.nuts.configuration | Configure Nuts directly in the Caddyfile or your JSON caddy configuration | See the Nuts configuration for the options | | default_cache.olric | Configure the Olric cache storage | | | default_cache.olric.path | Configure Olric with a file | /anywhere/olric_configuration.json | | default_cache.olric.configuration | Configure Olric directly in the Caddyfile or your JSON caddy configuration | See the Olric configuration for the options | | default_cache.port.{web,tls} | The device's local HTTP/TLS port that Souin should be listening on | Respectively 80 and 443 | | default_cache.regex.exclude | The regex used to prevent paths being cached | ^[A-z]+.*$ | | default_cache.stale | The stale duration | 25m | | default_cache.timeout | The timeout configuration | | | default_cache.timeout.backend | The timeout duration to consider the backend as unreachable | 10s | | default_cache.timeout.cache | The timeout duration to consider the cache provider as unreachable | 10ms | | default_cache.ttl | The TTL duration | 120s | | default_cache.default_cache_control | Set the default value of Cache-Control response header if not set by upstream (Souin treats empty Cache-Control as public if omitted) | no-store | | log_level | The log level | One of DEBUG, INFO, WARN, ERROR, DPANIC, PANIC, FATAL it's case insensitive | | urls.{your url or regex} | List of your custom configuration depending each URL or regex | ' https://yourdomain.com' | | urls.{your url or regex}.ttl | Override the default TTL if defined | 90s

10m | | urls.{your url or regex}.default_cache_control | Override the default default Cache-Control if defined | public, max-age=86400 | | urls.{your url or regex}.headers | Override the default headers if defined | - Authorization

- 'Content-Type' | | surrogate_keys.{key name}.headers | Headers that should match to be part of the surrogate key group | Authorization: ey.+

Content-Type: json | | surrogate_keys.{key name}.headers.{header name} | Header name that should be present a match the regex to be part of the surrogate key group | Content-Type: json | | surrogate_keys.{key name}.url | Url that should match to be part of the surrogate key group | .+ | | ykeys.{key name}.headers | (DEPRECATED) Headers that should match to be part of the ykey group | Authorization: ey.+

Content-Type: json | | ykeys.{key name}.headers.{header name} | (DEPRECATED) Header name that should be present a match the regex to be part of the ykey group | Content-Type: json | | ykeys.{key name}.url | (DEPRECATED) Url that should match to be part of the ykey group | .+ |