refactor: creating providers placeholders and barrel file

server/providers/codex/sessions.js

@@ -0,0 +1,63 @@
+/**
+ * Codex session history fetcher.
+ *
+ * Extracted from adapter.js — pure data-access concern.
+ * @module providers/codex/sessions
+ */
+
+import { normalizeCodexHistoryEntry } from './adapter.js';
+import { getCodexSessionMessages } from '../../projects.js';
+
+/**
+ * Fetch session history from Codex JSONL files.
+ * @param {string} sessionId
+ * @param {object} opts
+ * @param {number|null} [opts.limit]
+ * @param {number} [opts.offset]
+ * @returns {Promise<{messages: import('../../providers/types.js').NormalizedMessage[], total: number, hasMore: boolean, offset: number, limit: number|null, tokenUsage: object|null}>}
+ */
+export async function fetchHistory(sessionId, opts = {}) {
+  const { limit = null, offset = 0 } = opts;
+
+  let result;
+  try {
+    result = await getCodexSessionMessages(sessionId, limit, offset);
+  } catch (error) {
+    console.warn(`[CodexAdapter] Failed to load session ${sessionId}:`, error.message);
+    return { messages: [], total: 0, hasMore: false, offset: 0, limit: null };
+  }
+
+  const rawMessages = Array.isArray(result) ? result : (result.messages || []);
+  const total = Array.isArray(result) ? rawMessages.length : (result.total || 0);
+  const hasMore = Array.isArray(result) ? false : Boolean(result.hasMore);
+  const tokenUsage = result.tokenUsage || null;
+
+  const normalized = [];
+  for (const raw of rawMessages) {
+    const entries = normalizeCodexHistoryEntry(raw, sessionId);
+    normalized.push(...entries);
+  }
+
+  // Attach tool results to tool_use messages
+  const toolResultMap = new Map();
+  for (const msg of normalized) {
+    if (msg.kind === 'tool_result' && msg.toolId) {
+      toolResultMap.set(msg.toolId, msg);
+    }
+  }
+  for (const msg of normalized) {
+    if (msg.kind === 'tool_use' && msg.toolId && toolResultMap.has(msg.toolId)) {
+      const tr = toolResultMap.get(msg.toolId);
+      msg.toolResult = { content: tr.content, isError: tr.isError };
+    }
+  }
+
+  return {
+    messages: normalized,
+    total,
+    hasMore,
+    offset,
+    limit,
+    tokenUsage,
+  };
+}