Use xo-cash/utils sse. Add vending machine template. Greatly improve startup times.

src/services/invitation.ts

@@ -1,10 +1,9 @@
 import type {
-  AcceptInvitationParameters,
-  AppendInvitationParameters,
+  InvitationParameters,
   Engine,
   GetSpendableResourcesParameters,
 } from "@xo-cash/engine";
-import { generateTemplateIdentifier, hasInvitationExpired, mergeInvitationCommits } from "@xo-cash/engine";
+import { generateTemplateIdentifier, hasInvitationExpired, mergeInvitationCommits, serializeInvitation } from "@xo-cash/engine";
 import type {
   XOInvitation,
   XOInvitationCommit,
@@ -15,10 +14,6 @@ import type {
 } from "@xo-cash/types";
 import type { UnspentOutputData } from "@xo-cash/state";
 import {
-  bigIntToBinUint64LE,
-  bigIntToBinUintBE,
-  bigIntToBinUintLE,
-  bigIntToVmNumber,
   binToHex,
   encodeTransaction,
   generateTransaction,
@@ -90,13 +85,13 @@ export class Invitation extends EventEmitter<InvitationEventMap> {
     }
 
     // engine invitation (I have no idea if this is required)
-    const engineInvitation = await dependencies.engine.acceptInvitation(invitation);
+    const engineInvitation = await dependencies.engine.importInvitation(serializeInvitation(invitation));
 
     // Create the invitation
     const invitationInstance = new Invitation(engineInvitation, dependencies);
 
     // Start the invitation and its tracking
-    await invitationInstance.start();
+    invitationInstance.start();
 
     return invitationInstance;
   }
@@ -387,7 +382,7 @@ export class Invitation extends EventEmitter<InvitationEventMap> {
   /**
    * Accept the invitation
    */
-  async accept(acceptParams?: AcceptInvitationParameters): Promise<void> {
+  async accept(acceptParams?: InvitationParameters): Promise<void> {
     // Accept the invitation
     this.data = await this.engine.acceptInvitation(this.data, acceptParams);
 
@@ -438,7 +433,13 @@ export class Invitation extends EventEmitter<InvitationEventMap> {
   /**
    * Append a commit to the invitation
    */
-  async append(data: AppendInvitationParameters): Promise<void> {
+  async append(data: InvitationParameters): Promise<void> {
+    try {
+      await this.engine.acceptInvitation(this.data);
+    } catch (err) {
+      // Literally do nothing here. We are just trying to accept the invitation in case we haven't already
+    }
+
     // Append the commit to the invitation
     this.data = await this.engine.appendInvitation(this.data.invitationIdentifier, data);