improvement(cli): allow to pass a factory function to cache field

.changeset/tame-crabs-act.md

@@ -0,0 +1,13 @@
+---
+'@graphql-hive/gateway': minor
+---
+
+Improve `cache` configuration signature. 
+
+The `cache` configuration key now allow you to pass a custom factory function to get the cache instance: 
+
+```ts
+
+```
+
+In addition, the `context` exposed to cache functions now include the complete context of the gateway. 

packages/gateway/src/cli.ts

@@ -93,6 +93,10 @@ export interface GatewayCLIProxyConfig
   proxy?: GatewayConfigProxy['proxy'];
 }
 
+export type KeyValueCacheFactoryFn = (
+  ctx: GatewayConfigContext,
+) => KeyValueCache;
+
 export interface GatewayCLIBuiltinPluginConfig {
   /**
    * Configure JWT Auth
@@ -129,6 +133,7 @@ export interface GatewayCLIBuiltinPluginConfig {
   jit?: boolean;
   cache?:
     | KeyValueCache
+    | KeyValueCacheFactoryFn
     | GatewayCLILocalforageCacheConfig
     | GatewayCLIRedisCacheConfig
     | GatewayCLICloudflareKVCacheConfig;

packages/gateway/src/config.ts

@@ -146,8 +146,12 @@ export async function getBuiltinPluginsFromConfig(
 
 export async function getCacheInstanceFromConfig(
   config: GatewayCLIBuiltinPluginConfig,
-  ctx: Pick<GatewayConfigContext, 'logger' | 'pubsub'>,
+  ctx: GatewayConfigContext,
 ): Promise<KeyValueCache> {
+  if (typeof config.cache === 'function') {
+    return config.cache(ctx);
+  }
+
   if (config.cache && 'type' in config.cache) {
     switch (config.cache.type) {
       case 'redis': {