feat: implement partial messages gossipsub spec

packages/gossipsub/package.json

@@ -30,6 +30,10 @@
     "./types": {
       "types": "./dist/src/types.d.ts",
       "import": "./dist/src/types.js"
+    },
+    "./partial": {
+      "types": "./dist/src/partial/index.d.ts",
+      "import": "./dist/src/partial/index.js"
     }
   },
   "typesVersions": {
@@ -51,7 +55,7 @@
     "pretest:e2e": "npm run build",
     "benchmark": "yarn benchmark:files 'test/benchmark/**/*.test.ts'",
     "benchmark:files": "NODE_OPTIONS='--max-old-space-size=4096 --loader=ts-node/esm' benchmark --config .benchrc.yaml --defaultBranch master",
-    "test": "aegir test -f './dist/test/*.spec.js'",
+    "test": "aegir test -f './dist/test/*.spec.js' -f './dist/test/partial-messages/*.spec.js'",
     "test:unit": "aegir test -f './dist/test/unit/*.test.js' --target node",
     "test:e2e": "aegir test -f './dist/test/e2e/*.spec.js'",
     "test:browser": "npm run test -- --target browser"

packages/gossipsub/src/constants.ts

@@ -259,3 +259,29 @@ export const BACKOFF_SLACK = 1
 
 export const GossipsubIdontwantMinDataSize = 512
 export const GossipsubIdontwantMaxMessages = 512
+
+// Partial Messages Extension constants
+
+/**
+ * Maximum number of groups to track per topic in PartialMessageState.
+ * When exceeded, oldest groups are evicted (LRU).
+ *
+ * @default 128
+ */
+export const PartialMessagesMaxGroups = 128
+
+/**
+ * Time-to-live for partial message groups in milliseconds.
+ * Groups older than this are pruned during heartbeat.
+ *
+ * @default 120000 (2 minutes)
+ */
+export const PartialMessagesGroupTTLMs = 2 * minute
+
+/**
+ * Maximum size in bytes for parts metadata.
+ * Metadata larger than this will be rejected.
+ *
+ * @default 1024
+ */
+export const PartialMessagesMaxMetadataSize = 1024