fix(runtime-host): serve revision-consistent Usage snapshots

apps/desktop/src/main/__tests__/runtime-host-client-usage.test.ts

@@ -0,0 +1,253 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import type { RuntimeHostConnection } from '@maka/runtime-host/client';
+import type { OperationInput, OperationKey } from '@maka/runtime-host/protocol';
+import {
+  DesktopRuntimeHostClient,
+  DesktopRuntimeHostClientError,
+} from '../runtime-host-client.js';
+
+test('loads all Usage snapshot pages behind one start revision', async () => {
+  const requests: Array<{ operation: OperationKey; input: unknown }> = [];
+  const client = usageClient(async (operation, input) => {
+    requests.push({ operation, input });
+    assert.equal(operation, 'usage.query');
+    if (input.kind === 'snapshot_start') return started('revision-1', 2);
+    assert.equal(input.revision, 'revision-1');
+    if (input.kind === 'snapshot_logs' && input.source === 'llm') {
+      return input.offset === 0
+        ? logPage('revision-1', 'llm', [llmLog('llm-1', 2)], 0, 2, 1, false)
+        : logPage('revision-1', 'llm', [llmLog('llm-2', 1)], 1, 2, null, false);
+    }
+    if (input.kind === 'snapshot_logs') {
+      return logPage('revision-1', 'tool', [toolLog('tool-1', 3)], 0, 1, null, false);
+    }
+    if (input.kind === 'snapshot_pricing') {
+      return input.offset === 0
+        ? pricingPage('revision-1', [pricing('a:model')], 0, 2, 1)
+        : pricingPage('revision-1', [pricing('b:model')], 1, 2, null);
+    }
+    throw new Error('Unexpected Usage request');
+  });
+
+  assert.deepEqual(await client.loadUsageSnapshot({ from: 0, to: 10 }), {
+    revision: 'revision-1',
+    summary: validSummary(2),
+    provenance: validProvenance(),
+    llmLogs: [llmLog('llm-1', 2), llmLog('llm-2', 1)],
+    toolLogs: [toolLog('tool-1', 3)],
+    pricingEntries: [pricing('a:model'), pricing('b:model')],
+    llmLogsTruncated: false,
+    toolLogsTruncated: false,
+  });
+  assert.equal(
+    requests.filter(({ input }) => (input as { kind?: string }).kind === 'snapshot_start').length,
+    1,
+  );
+});
+
+test('discards every partial Usage result and restarts after revision_changed', async () => {
+  let starts = 0;
+  const client = usageClient(async (_operation, input) => {
+    if (input.kind === 'snapshot_start') {
+      starts += 1;
+      return started(`revision-${starts}`, starts);
+    }
+    if (input.revision === 'revision-1' && input.kind === 'snapshot_logs' && input.source === 'llm') {
+      return { kind: 'revision_changed', expectedRevision: 'revision-1' };
+    }
+    if (input.kind === 'snapshot_logs') {
+      const row = input.source === 'llm' ? llmLog('fresh-llm', 2) : toolLog('fresh-tool', 1);
+      return logPage(input.revision, input.source, [row], 0, 1, null, false);
+    }
+    if (input.kind === 'snapshot_pricing') {
+      return pricingPage(input.revision, [pricing('fresh:model')], 0, 1, null);
+    }
+    throw new Error('Unexpected Usage request');
+  });
+
+  const snapshot = await client.loadUsageSnapshot('all');
+  assert.equal(starts, 2);
+  assert.equal(snapshot.revision, 'revision-2');
+  assert.deepEqual(snapshot.llmLogs.map((row) => row.id), ['fresh-llm']);
+  assert.deepEqual(snapshot.toolLogs.map((row) => row.id), ['fresh-tool']);
+});
+
+test('fails with usage_unstable after three complete Usage snapshot attempts', async () => {
+  let starts = 0;
+  const client = usageClient(async (_operation, input) => {
+    if (input.kind === 'snapshot_start') {
+      starts += 1;
+      return started(`revision-${starts}`, 0);
+    }
+    return { kind: 'revision_changed', expectedRevision: input.revision };
+  });
+
+  await assert.rejects(
+    () => client.loadUsageSnapshot('all'),
+    (error: unknown) =>
+      error instanceof DesktopRuntimeHostClientError && error.code === 'usage_unstable',
+  );
+  assert.equal(starts, 3);
+});
+
+test('rejects non-progressing or identity-changing Usage snapshot pages', async () => {
+  const client = usageClient(async (_operation, input) => {
+    if (input.kind === 'snapshot_start') return started('revision-1', 1);
+    if (input.kind === 'snapshot_logs' && input.source === 'llm') {
+      return logPage('wrong-revision', 'llm', [llmLog('llm-1', 1)], 0, 2, 0, false);
+    }
+    if (input.kind === 'snapshot_logs') {
+      return logPage('revision-1', 'tool', [], 0, 0, null, false);
+    }
+    return pricingPage('revision-1', [], 0, 0, null);
+  });
+
+  await assert.rejects(
+    () => client.loadUsageSnapshot('all'),
+    (error: unknown) =>
+      error instanceof DesktopRuntimeHostClientError && error.code === 'projection_unstable',
+  );
+});
+
+function usageClient(
+  respond: (operation: OperationKey, input: any) => Promise<any>,
+): DesktopRuntimeHostClient {
+  const connection = {
+    hostEpoch: 'host-current',
+    connectionId: 'connection-current',
+    rootId: 'root-current',
+    request: <K extends OperationKey>(operation: K, input: OperationInput<K>) =>
+      respond(operation, input),
+    close: async () => undefined,
+  } as unknown as RuntimeHostConnection;
+  return new DesktopRuntimeHostClient(connection);
+}
+
+function started(revision: string, totalRequests: number) {
+  return {
+    kind: 'snapshot_started' as const,
+    revision,
+    summary: validSummary(totalRequests),
+    provenance: validProvenance(),
+  };
+}
+
+function logPage(
+  revision: string,
+  source: 'llm' | 'tool',
+  rows: readonly unknown[],
+  offset: number,
+  total: number,
+  nextOffset: number | null,
+  truncated: boolean,
+) {
+  return { kind: 'snapshot_logs' as const, revision, source, rows, offset, total, nextOffset, truncated };
+}
+
+function pricingPage(
+  revision: string,
+  entries: readonly unknown[],
+  offset: number,
+  total: number,
+  nextOffset: number | null,
+) {
+  return { kind: 'snapshot_pricing' as const, revision, entries, offset, total, nextOffset };
+}
+
+function validSummary(totalRequests: number) {
+  return {
+    range: { from: 0, to: 10 },
+    totalRequests,
+    totalCostUsd: 0,
+    totalTokens: {
+      input: 0,
+      output: 0,
+      cacheMiss: 0,
+      cacheRead: 0,
+      cacheWrite: 0,
+      reasoning: 0,
+      total: 0,
+    },
+    cacheHitRequests: 0,
+    cacheCreateRequests: 0,
+    errorRequests: 0,
+  };
+}
+
+function validProvenance() {
+  return {
+    coverage: {
+      attempts: 0,
+      pricedAttempts: 0,
+      unpricedAttempts: 0,
+      usageReportedAttempts: 0,
+      usagePartialAttempts: 0,
+      usageMissingAttempts: 0,
+    },
+    legacyRecords: 0,
+    unreadableRecords: 0,
+    pendingRepairs: 0,
+  };
+}
+
+function llmLog(id: string, ts: number) {
+  return {
+    source: 'llm' as const,
+    id,
+    ts,
+    providerId: 'provider',
+    modelId: 'model',
+    inputTokens: 1,
+    outputTokens: 1,
+    cacheMissTokens: 1,
+    cacheReadTokens: 0,
+    cacheWriteTokens: 0,
+    reasoningTokens: 0,
+    totalTokens: 2,
+    costUsd: 0,
+    latencyMs: 1,
+    status: 'success' as const,
+  };
+}
+
+function toolLog(id: string, ts: number) {
+  return {
+    source: 'tool' as const,
+    id,
+    ts,
+    toolName: 'Read',
+    durationMs: 1,
+    status: 'success' as const,
+    bytesIn: 0,
+    bytesOut: 0,
+    startedAt: ts,
+  };
+}
+
+function pricing(modelKey: string) {
+  return {
+    source: 'custom' as const,
+    resetEffect: 'become_unpriced' as const,
+    pricing: { modelKey, inputUsdPer1M: 1, outputUsdPer1M: 2 },
+  };
+}