http: websocket events for auctions

Emit events over websocket for auction
related events that are emitted by the
walletdb.

lib/wallet/http.js

@@ -1303,6 +1303,21 @@ class HTTP extends Server {
         this.to('w:*', event, wallet.id, json);
     };
 
+    const handleCovenant = (event, wallet, data, details) => {
+      const name = `w:${wallet.id}`;
+
+      if (!this.channel(name) && !this.channel('w:*'))
+        return;
+
+      const json = details.getJSON(this.network, this.wdb.height);
+
+      if (this.channel(name))
+        this.to(name, event, wallet.id, data, json);
+
+      if (this.channel('w:*'))
+        this.to('w:*', event, wallet.id, data, json);
+    };
+
     this.wdb.on('tx', (wallet, tx, details) => {
       handleTX('tx', wallet, tx, details);
     });
@@ -1351,6 +1366,16 @@ class HTTP extends Server {
       if (this.channel('w:*'))
         this.to('w:*', 'address', wallet.id, json);
     });
+
+    // set up listener for each covenant type
+    for (const type of Object.values(rules.typesByVal))
+      if (type !== 'NONE') {
+        const action = type.toLowerCase();
+        const channel = `${action} covenant`;
+        this.wdb.on(channel, (wallet, data, details) => {
+          handleCovenant(type, wallet, data, details);
+        });
+      }
   }
 
   /**