Add chain-type policies and allowlist support

Introduce ChainTypesConfig and AllowlistConfig to support chain-type-level default policies (cache rules and allowlists) while allowing per-chain overrides. Rework caching to key caches by primitives::Chain and derive cache rules from chain types or per-chain config: MemoryCache now accepts ChainTypesConfig and chain configs when created, and RequestCache/CacheProvider interfaces adjusted (removed legacy should_cache). NodeService now enforces allowlists via chain_types and returns HTTP 403 for disallowed requests. Updated config.yml with chain_types entries, added allowlist and chain type cache examples, exported new config types, wired chain_types through main, proxy builder and services, and updated/added tests to reflect the new behavior.

Author: gemcoder21

core/Cargo.lock

@@ -23,4 +23,5 @@ settings_chain = { path = "../../crates/settings_chain" }
 serde_serializers = { path = "../../crates/serde_serializers" }
 
 url = { workspace = true }
+uuid = { workspace = true }
 gem_auth = { path = "../../crates/gem_auth", features = ["client"] }

core/apps/dynode/Cargo.toml

@@ -46,11 +46,23 @@ retry:
 
 cache:
   max_memory_mb: 1024
-  rules:
-    ethereum:
+
+chain_types:
+  ethereum:
+    allowlist:
+      - rpc_method: eth_chainId
+      - rpc_method: eth_sendRawTransaction
+    cache:
       - rpc_method: eth_chainId
         ttl: 1h
-    tron:
+  bitcoin:
+    allowlist:
+      - path: /api/v2/address/**
+        method: GET
+      - path: /api/v2/sendtx/
+        method: POST
+  tron:
+    cache:
       - path: /wallet/getchainparameters
         method: GET
         ttl: 1d
@@ -66,24 +78,24 @@ cache:
       - path: /wallet/getReward
         method: POST
         inflight: true
-    solana:
+  solana:
+    cache:
       - rpc_method: getVoteAccounts
         ttl: 1h
-    cosmos:
+  cosmos:
+    cache:
       - path: /cosmos/staking/v1beta1/validators
         method: GET
         ttl: 1d
-    bitcoin:
-      - path: /api/v2/block/**
-        method: GET
-        ttl: 0s
-    hypercore:
+  hypercore:
+    cache:
       - path: /info
         method: POST
         ttl: 1h
         params:
           type: metaAndAssetCtxs
-    aptos:
+  aptos:
+    cache:
       - path: /v1/view
         method: POST
         ttl: 1h