interface: storing the gcp token

pkg/interface/src/logic/api/gcp.ts

@@ -4,21 +4,38 @@ import {GcpToken} from '../types/gcp-state';
 
 
 export default class GcpApi extends BaseApi<StoreState> {
+  #running = false;
+
   startRefreshLoop() {
-    // TODO: don't allow more than one
-    this.refreshLoop();
+    if (this.#running) {
+      console.error('GcpApi startRefreshLoop: already running');
+    } else {
+      this.#running = true;
+      this.refreshLoop();
+    }
   }
 
   private refreshLoop() {
-    console.log("refreshing GCP token");
+    console.log("GcpApi refreshLoop");
     this.refreshToken().then(({accessKey, expiresIn}: GcpToken) => {
-      console.log("new token: ", accessKey);
+      console.log("GcpApi new token");
+      // XX maybe bad?
+      this.store.state.gcp.accessKey = accessKey;
+      const timeout = this.refreshInterval(expiresIn);
+      console.log("GcpApi refreshing in", timeout);
       setTimeout(() => {
         this.refreshLoop();
-      }, expiresIn);
+      }, timeout);
     });
   }
 
+  private refreshInterval(expiresIn: number) {
+    // Give ourselves 30 seconds for processing delays, but never refresh
+    // sooner than 10 minute from now. (The expiry window should be about an
+    // hour.)
+    return Math.max(600_000, expiresIn - 30_000);
+  }
+
   private async refreshToken() {
     const token = await this.spider('noun', 'gcp-token', 'get-gcp-token', {});
     return token['gcp-token'];

pkg/interface/src/logic/store/store.ts

@@ -71,7 +71,9 @@ export default class GlobalStore extends BaseStore<StoreState> {
       },
       weather: {},
       userLocation: null,
-      gcp: {},
+      gcp: {
+        accessKey: null
+      },
       s3: {
         configuration: {
           buckets: new Set(),

pkg/interface/src/types/gcp-state.ts

@@ -4,5 +4,5 @@ export interface GcpToken {
 };
 
 export interface GcpState {
-  token: GcpToken;
+  accessKey: string;
 };