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| 1 | +import { describe, test, expect } from "bun:test"; |
| 2 | +import fs from "node:fs"; |
| 3 | +import os from "node:os"; |
| 4 | +import path from "node:path"; |
| 5 | + |
| 6 | +import { |
| 7 | + AgentTraceNotFoundError, |
| 8 | + findAgentTraceDir, |
| 9 | + listUniqueSubdirs, |
| 10 | + readAgentTrace, |
| 11 | + MAX_TRACE_ENTRY_LIMIT, |
| 12 | + MAX_TRACE_TOTAL_CHARS, |
| 13 | + MAX_TRACE_TURN_WINDOW, |
| 14 | +} from "./trace-reader.js"; |
| 15 | + |
| 16 | +function tempDir(): string { |
| 17 | + return fs.mkdtempSync(path.join(os.tmpdir(), "trace-reader-")); |
| 18 | +} |
| 19 | + |
| 20 | +function writeTurns(dir: string, turns: unknown[]): void { |
| 21 | + fs.mkdirSync(dir, { recursive: true }); |
| 22 | + const text = turns.map((t) => JSON.stringify(t)).join("\n") + (turns.length > 0 ? "\n" : ""); |
| 23 | + fs.writeFileSync(path.join(dir, "turns.jsonl"), text); |
| 24 | +} |
| 25 | + |
| 26 | +describe("listUniqueSubdirs", () => { |
| 27 | + test("a directory containing latest plus its target enumerates the session exactly once", async () => { |
| 28 | + const root = tempDir(); |
| 29 | + const real = path.join(root, "01234567-89ab-7def-8123-456789abcdef"); |
| 30 | + fs.mkdirSync(real); |
| 31 | + fs.symlinkSync(path.basename(real), path.join(root, "latest")); |
| 32 | + |
| 33 | + const entries = await listUniqueSubdirs(root); |
| 34 | + expect(entries).toHaveLength(1); |
| 35 | + expect(entries[0]!.path).toBe(fs.realpathSync(real)); |
| 36 | + }); |
| 37 | + |
| 38 | + test("two distinct real directories are both listed", async () => { |
| 39 | + const root = tempDir(); |
| 40 | + fs.mkdirSync(path.join(root, "a")); |
| 41 | + fs.mkdirSync(path.join(root, "b")); |
| 42 | + const entries = await listUniqueSubdirs(root); |
| 43 | + expect(entries).toHaveLength(2); |
| 44 | + }); |
| 45 | + |
| 46 | + test("a broken symlink is skipped, not thrown", async () => { |
| 47 | + const root = tempDir(); |
| 48 | + fs.symlinkSync(path.join(root, "does-not-exist"), path.join(root, "dangling")); |
| 49 | + const entries = await listUniqueSubdirs(root); |
| 50 | + expect(entries).toHaveLength(0); |
| 51 | + }); |
| 52 | + |
| 53 | + test("missing directory returns empty rather than throwing", async () => { |
| 54 | + const entries = await listUniqueSubdirs(path.join(tempDir(), "nope")); |
| 55 | + expect(entries).toHaveLength(0); |
| 56 | + }); |
| 57 | +}); |
| 58 | + |
| 59 | +describe("findAgentTraceDir", () => { |
| 60 | + test("finds a direct child under root/subagents", async () => { |
| 61 | + const root = tempDir(); |
| 62 | + const childDir = path.join(root, "subagents", "child-1"); |
| 63 | + writeTurns(childDir, []); |
| 64 | + const found = await findAgentTraceDir(root, "child-1"); |
| 65 | + expect(found).toBe(fs.realpathSync(childDir)); |
| 66 | + }); |
| 67 | + |
| 68 | + test("finds a nested descendant several levels deep", async () => { |
| 69 | + const root = tempDir(); |
| 70 | + const grandchildDir = path.join(root, "subagents", "child-1", "subagents", "grandchild-1"); |
| 71 | + writeTurns(grandchildDir, []); |
| 72 | + const found = await findAgentTraceDir(root, "grandchild-1"); |
| 73 | + expect(found).toBe(fs.realpathSync(grandchildDir)); |
| 74 | + }); |
| 75 | + |
| 76 | + test("returns null for an unknown id", async () => { |
| 77 | + const root = tempDir(); |
| 78 | + writeTurns(path.join(root, "subagents", "child-1"), []); |
| 79 | + const found = await findAgentTraceDir(root, "does-not-exist"); |
| 80 | + expect(found).toBeNull(); |
| 81 | + }); |
| 82 | + |
| 83 | + test("is not confused by a latest symlink alongside the real worker dir", async () => { |
| 84 | + const root = tempDir(); |
| 85 | + const childDir = path.join(root, "subagents", "child-1"); |
| 86 | + writeTurns(childDir, []); |
| 87 | + fs.symlinkSync("child-1", path.join(root, "subagents", "latest")); |
| 88 | + const found = await findAgentTraceDir(root, "child-1"); |
| 89 | + expect(found).toBe(fs.realpathSync(childDir)); |
| 90 | + }); |
| 91 | +}); |
| 92 | + |
| 93 | +describe("readAgentTrace", () => { |
| 94 | + test("throws a clean error for a missing target", async () => { |
| 95 | + const root = tempDir(); |
| 96 | + await expect(readAgentTrace(root, "ghost")).rejects.toBeInstanceOf(AgentTraceNotFoundError); |
| 97 | + }); |
| 98 | + |
| 99 | + test("reads turns, tool calls, and tool errors", async () => { |
| 100 | + const root = tempDir(); |
| 101 | + const childDir = path.join(root, "subagents", "worker-1"); |
| 102 | + writeTurns(childDir, [ |
| 103 | + { role: "user", content: [{ type: "text", text: "do the thing" }] }, |
| 104 | + { |
| 105 | + role: "assistant", |
| 106 | + content: [{ type: "tool_call", id: "call-1", name: "run_shell", arguments: { cmd: "ls" } }], |
| 107 | + }, |
| 108 | + { |
| 109 | + role: "user", |
| 110 | + content: [ |
| 111 | + { |
| 112 | + type: "tool_result", |
| 113 | + callId: "call-1", |
| 114 | + content: [{ type: "text", text: "boom" }], |
| 115 | + isError: true, |
| 116 | + }, |
| 117 | + ], |
| 118 | + }, |
| 119 | + ]); |
| 120 | + |
| 121 | + const result = await readAgentTrace(root, "worker-1"); |
| 122 | + expect(result.totalTurns).toBe(3); |
| 123 | + expect(result.entries.map((e) => e.kind)).toEqual(["text", "tool_call", "error"]); |
| 124 | + expect(result.entries[2]!.isError).toBe(true); |
| 125 | + expect(result.omitted).toBeNull(); |
| 126 | + }); |
| 127 | + |
| 128 | + test("skips a malformed trailing line instead of throwing", async () => { |
| 129 | + const root = tempDir(); |
| 130 | + const childDir = path.join(root, "subagents", "worker-1"); |
| 131 | + fs.mkdirSync(childDir, { recursive: true }); |
| 132 | + const good = JSON.stringify({ role: "user", content: [{ type: "text", text: "hi" }] }); |
| 133 | + fs.writeFileSync(path.join(childDir, "turns.jsonl"), `${good}\n{"role":"assistant","cont`); |
| 134 | + |
| 135 | + const result = await readAgentTrace(root, "worker-1"); |
| 136 | + expect(result.totalTurns).toBe(1); |
| 137 | + expect(result.parseWarnings).toBe(1); |
| 138 | + expect(result.entries).toHaveLength(1); |
| 139 | + }); |
| 140 | + |
| 141 | + test("bounds the entry count to the requested limit and reports omission", async () => { |
| 142 | + const root = tempDir(); |
| 143 | + const childDir = path.join(root, "subagents", "worker-1"); |
| 144 | + const turns = Array.from({ length: 5 }, (_, i) => ({ |
| 145 | + role: "assistant", |
| 146 | + content: [{ type: "text", text: `turn ${i}` }], |
| 147 | + })); |
| 148 | + writeTurns(childDir, turns); |
| 149 | + |
| 150 | + const result = await readAgentTrace(root, "worker-1", { limit: 2 }); |
| 151 | + expect(result.entries).toHaveLength(2); |
| 152 | + expect(result.entriesTruncated).toBe(true); |
| 153 | + expect(result.omitted).not.toBeNull(); |
| 154 | + expect(result.omitted!.hint.length).toBeGreaterThan(0); |
| 155 | + }); |
| 156 | + |
| 157 | + test("never exceeds the total-output character cap regardless of entry/window caps", async () => { |
| 158 | + const root = tempDir(); |
| 159 | + const childDir = path.join(root, "subagents", "worker-1"); |
| 160 | + const turns = Array.from({ length: 600 }, (_, i) => ({ |
| 161 | + role: "assistant", |
| 162 | + content: [{ type: "text", text: `turn ${i} `.repeat(1000) }], // ~5,000 chars each |
| 163 | + })); |
| 164 | + writeTurns(childDir, turns); |
| 165 | + |
| 166 | + const result = await readAgentTrace(root, "worker-1", { |
| 167 | + fromTurn: 0, |
| 168 | + toTurn: 600, |
| 169 | + limit: MAX_TRACE_ENTRY_LIMIT, |
| 170 | + }); |
| 171 | + const totalChars = result.entries.reduce((sum, e) => sum + e.content.length, 0); |
| 172 | + expect(totalChars).toBeLessThanOrEqual(MAX_TRACE_TOTAL_CHARS); |
| 173 | + expect(result.entriesTruncated).toBe(true); |
| 174 | + expect(result.omitted).not.toBeNull(); |
| 175 | + expect(result.omitted!.reason).toContain("total output cap"); |
| 176 | + }); |
| 177 | + |
| 178 | + test("never exceeds the hard entry-limit cap regardless of requested limit", async () => { |
| 179 | + const root = tempDir(); |
| 180 | + const childDir = path.join(root, "subagents", "worker-1"); |
| 181 | + const turns = Array.from({ length: 10 }, (_, i) => ({ |
| 182 | + role: "assistant", |
| 183 | + content: [{ type: "text", text: `turn ${i}` }], |
| 184 | + })); |
| 185 | + writeTurns(childDir, turns); |
| 186 | + |
| 187 | + const result = await readAgentTrace(root, "worker-1", { limit: 1_000_000 }); |
| 188 | + expect(result.entries.length).toBeLessThanOrEqual(MAX_TRACE_ENTRY_LIMIT); |
| 189 | + }); |
| 190 | + |
| 191 | + test("never exceeds the hard turn-window cap regardless of requested range", async () => { |
| 192 | + const root = tempDir(); |
| 193 | + const childDir = path.join(root, "subagents", "worker-1"); |
| 194 | + const turns = Array.from({ length: 500 }, (_, i) => ({ |
| 195 | + role: "assistant", |
| 196 | + content: [{ type: "text", text: `turn ${i}` }], |
| 197 | + })); |
| 198 | + writeTurns(childDir, turns); |
| 199 | + |
| 200 | + const result = await readAgentTrace(root, "worker-1", { |
| 201 | + fromTurn: 0, |
| 202 | + toTurn: 500, |
| 203 | + limit: MAX_TRACE_ENTRY_LIMIT, |
| 204 | + }); |
| 205 | + expect(result.toTurn - result.fromTurn).toBeLessThanOrEqual(MAX_TRACE_TURN_WINDOW); |
| 206 | + }); |
| 207 | + |
| 208 | + test("filters entries by kind", async () => { |
| 209 | + const root = tempDir(); |
| 210 | + const childDir = path.join(root, "subagents", "worker-1"); |
| 211 | + writeTurns(childDir, [ |
| 212 | + { |
| 213 | + role: "assistant", |
| 214 | + content: [ |
| 215 | + { type: "thinking", thinking: "hmm" }, |
| 216 | + { type: "text", text: "hello" }, |
| 217 | + ], |
| 218 | + }, |
| 219 | + ]); |
| 220 | + |
| 221 | + const result = await readAgentTrace(root, "worker-1", { kinds: ["text"] }); |
| 222 | + expect(result.entries.map((e) => e.kind)).toEqual(["text"]); |
| 223 | + }); |
| 224 | + |
| 225 | + test("truncates an oversized entry body and marks it truncated", async () => { |
| 226 | + const root = tempDir(); |
| 227 | + const childDir = path.join(root, "subagents", "worker-1"); |
| 228 | + writeTurns(childDir, [ |
| 229 | + { role: "assistant", content: [{ type: "text", text: "x".repeat(10_000) }] }, |
| 230 | + ]); |
| 231 | + |
| 232 | + const result = await readAgentTrace(root, "worker-1"); |
| 233 | + expect(result.entries[0]!.truncated).toBe(true); |
| 234 | + expect(result.entries[0]!.content.length).toBeLessThan(10_000); |
| 235 | + }); |
| 236 | + |
| 237 | + test("a partially written trace (worker still running) reads what exists so far", async () => { |
| 238 | + const root = tempDir(); |
| 239 | + const childDir = path.join(root, "subagents", "worker-1"); |
| 240 | + fs.mkdirSync(childDir, { recursive: true }); |
| 241 | + fs.writeFileSync( |
| 242 | + path.join(childDir, "turns.jsonl"), |
| 243 | + `${JSON.stringify({ role: "user", content: [{ type: "text", text: "go" }] })}\n`, |
| 244 | + ); |
| 245 | + |
| 246 | + const result = await readAgentTrace(root, "worker-1"); |
| 247 | + expect(result.totalTurns).toBe(1); |
| 248 | + expect(result.entries).toHaveLength(1); |
| 249 | + }); |
| 250 | +}); |
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