support preopen hrmp channels

configs/karura.yml

@@ -42,4 +42,3 @@ parachains:
   nodes:
   - flags:
     - --alice
-

src/index.ts

@@ -177,6 +177,16 @@ const generateRelaychainGenesisFile = (config: Config, path: string, output: str
 
   // additional patches
   if (config.relaychain.runtimeGenesisConfig) {
+    const hrmp = config.relaychain.runtimeGenesisConfig.hrmp;
+    if (hrmp) {
+      hrmp.preopenHrmpChannels = hrmp.preopenHrmpChannels.map((channel) => {
+        if (!Array.isArray(channel)) {
+          return [channel.sender, channel.recipient, channel.maxCapacity, channel.maxMessageSize];
+        } else {
+          return channel;
+        }
+      });
+    }
     _.merge(runtime, config.relaychain.runtimeGenesisConfig);
   }
 

src/types.ts

@@ -11,6 +11,9 @@ export interface RelayChain {
   nodes: Node[];
   runtimeGenesisConfig: {
     configuration: { config: { [index: string]: string | number } };
+    hrmp?: {
+      preopenHrmpChannels: HrmpChannelsConfig[];
+    };
   };
 }
 
@@ -68,3 +71,12 @@ export interface DockerNode {
     };
   };
 }
+
+export type HrmpChannelsConfig =
+  | {
+      sender: number;
+      recipient: number;
+      maxCapacity: number;
+      maxMessageSize: number;
+    }
+  | [number, number, number, number];