Address response bodies by response id instead of a filesystem path (#550)

apps/yaak-client/hooks/useIntrospectGraphQL.ts

@@ -5,7 +5,6 @@ import type { GraphQLSchema, IntrospectionQuery } from "graphql";
 import { buildClientSchema, getIntrospectionQuery } from "graphql";
 import { useCallback, useEffect, useMemo, useState } from "react";
 import { minPromiseMillis } from "../lib/minPromiseMillis";
-import { getResponseBodyText } from "../lib/responseBody";
 import { sendEphemeralRequest } from "../lib/sendEphemeralRequest";
 import { useActiveEnvironment } from "./useActiveEnvironment";
 import { useDebouncedValue } from "@yaakapp-internal/ui";
@@ -55,7 +54,7 @@ export function useIntrospectGraphQL(
         bodyType: "application/json",
         body: { text: introspectionRequestBody },
       };
-      const response = await minPromiseMillis(
+      const { response, body } = await minPromiseMillis(
         sendEphemeralRequest(args, activeEnvironment?.id ?? null),
         700,
       );
@@ -64,14 +63,16 @@ export function useIntrospectGraphQL(
         return setError(response.error);
       }
 
-      const bodyText = await getResponseBodyText({ response, filter: null });
+      // The send hands back the only copy of the body — an unsaved response has
+      // nothing on disk and no row to read it back from
+      const bodyText = new TextDecoder("utf-8").decode(new Uint8Array(body));
       if (response.status < 200 || response.status >= 300) {
         return setError(
           `Request failed with status ${response.status}.\nThe response text is:\n\n${bodyText}`,
         );
       }
 
-      if (bodyText === null) {
+      if (bodyText === "") {
         return setError("Empty body returned in response");
       }
 

apps/yaak-client/hooks/useResponseBodyUrl.ts

@@ -0,0 +1,24 @@
+import { useQuery } from "@tanstack/react-query";
+import type { HttpResponse } from "@yaakapp-internal/models";
+import { platform } from "@yaakapp-internal/platform";
+
+/**
+ * A URL for a stored response body, for the viewers that hand one to an element
+ * instead of reading the bytes themselves.
+ *
+ * Resolved once here rather than inside each viewer: the host may have to ask
+ * the backend where the body is, and a viewer that computes its source during
+ * render (the PDF one, deliberately) needs it settled before it mounts.
+ *
+ * Null data means the response has no stored body.
+ */
+export function useResponseBodyUrl(response: HttpResponse | null) {
+  const responseId = response?.id ?? null;
+
+  return useQuery({
+    queryKey: ["response_body_url", responseId, response?.updatedAt ?? ""],
+    enabled: responseId != null,
+    // A response body is stored under the response's own id
+    queryFn: () => (responseId == null ? null : platform.blobs.url(responseId)),
+  });
+}