Work on #508 (thin client)

web/syscalls/util.ts

@@ -0,0 +1,33 @@
+import { SysCallMapping } from "../../plugos/system.ts";
+import { SyscallResponse } from "../../server/rpc.ts";
+import { Client } from "../client.ts";
+
+export function proxySyscalls(client: Client, names: string[]): SysCallMapping {
+  const syscalls: SysCallMapping = {};
+  for (const name of names) {
+    syscalls[name] = async (_ctx, ...args: any[]) => {
+      if (!client.remoteSpacePrimitives) {
+        throw new Error("Not supported");
+      }
+      const resp = await client.remoteSpacePrimitives.authenticatedFetch(
+        `${client.remoteSpacePrimitives.url}/.rpc`,
+        {
+          method: "POST",
+          body: JSON.stringify({
+            operation: "syscall",
+            name,
+            args,
+          }),
+        },
+      );
+      const result: SyscallResponse = await resp.json();
+      if (result.error) {
+        console.error("Remote syscall error", result.error);
+        throw new Error(result.error);
+      } else {
+        return result.result;
+      }
+    };
+  }
+  return syscalls;
+}