Add dashboard token usage history (#240)

electron/utils/token-usage.ts

@@ -0,0 +1,69 @@
+import { readdir, readFile, stat } from 'fs/promises';
+import { join } from 'path';
+import { getOpenClawConfigDir } from './paths';
+import { logger } from './logger';
+import { parseUsageEntriesFromJsonl, type TokenUsageHistoryEntry } from './token-usage-core';
+
+export { parseUsageEntriesFromJsonl, type TokenUsageHistoryEntry } from './token-usage-core';
+
+async function listRecentSessionFiles(): Promise<Array<{ filePath: string; sessionId: string; agentId: string; mtimeMs: number }>> {
+  const openclawDir = getOpenClawConfigDir();
+  const agentsDir = join(openclawDir, 'agents');
+
+  try {
+    const agentEntries = await readdir(agentsDir);
+    const files: Array<{ filePath: string; sessionId: string; agentId: string; mtimeMs: number }> = [];
+
+    for (const agentId of agentEntries) {
+      const sessionsDir = join(agentsDir, agentId, 'sessions');
+      try {
+        const sessionEntries = await readdir(sessionsDir);
+
+        for (const fileName of sessionEntries) {
+          if (!fileName.endsWith('.jsonl') || fileName.includes('.deleted.')) continue;
+          const filePath = join(sessionsDir, fileName);
+          try {
+            const fileStat = await stat(filePath);
+            files.push({
+              filePath,
+              sessionId: fileName.replace(/\.jsonl$/, ''),
+              agentId,
+              mtimeMs: fileStat.mtimeMs,
+            });
+          } catch {
+            continue;
+          }
+        }
+      } catch {
+        continue;
+      }
+    }
+
+    files.sort((a, b) => b.mtimeMs - a.mtimeMs);
+    return files;
+  } catch {
+    return [];
+  }
+}
+
+export async function getRecentTokenUsageHistory(limit = 20): Promise<TokenUsageHistoryEntry[]> {
+  const files = await listRecentSessionFiles();
+  const results: TokenUsageHistoryEntry[] = [];
+
+  for (const file of files) {
+    if (results.length >= limit) break;
+    try {
+      const content = await readFile(file.filePath, 'utf8');
+      const entries = parseUsageEntriesFromJsonl(content, {
+        sessionId: file.sessionId,
+        agentId: file.agentId,
+      }, limit - results.length);
+      results.push(...entries);
+    } catch (error) {
+      logger.debug(`Failed to read token usage transcript ${file.filePath}:`, error);
+    }
+  }
+
+  results.sort((a, b) => Date.parse(b.timestamp) - Date.parse(a.timestamp));
+  return results.slice(0, limit);
+}