Support for store.has syscall

plug-api/plugos-syscall/store.ts

@@ -31,6 +31,10 @@ export function get(key: string): Promise<any> {
   return syscall("store.get", key);
 }
 
+export function has(key: string): Promise<boolean> {
+  return syscall("store.has", key);
+}
+
 export function del(key: string): Promise<void> {
   return syscall("store.delete", key);
 }

plugos/syscalls/store.sqlite.ts

@@ -135,6 +135,13 @@ export function storeSyscalls(
         return null;
       }
     },
+    "store.has": async (_ctx, key: string): Promise<boolean> => {
+      const result = await db.query(
+        `SELECT count(value) as cnt FROM ${tableName} WHERE key = ?`,
+        key,
+      );
+      return result[0].cnt === 1;
+    },
     "store.queryPrefix": async (_ctx, prefix: string) => {
       return (
         await db.query(

web/syscalls/store.ts

@@ -7,6 +7,7 @@ export function storeSyscalls(space: Space): SysCallMapping {
     [
       "store.queryPrefix",
       "store.get",
+      "store.has",
       "store.set",
       "store.batchSet",
       "store.delete",