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import { spawn } from "node:child_process"
import fs from "node:fs/promises"
import net from "node:net"
import os from "node:os"
import path from "node:path"
import { fileURLToPath } from "node:url"
type Handle = {
url: string
stop: () => Promise<void>
}
function freePort() {
return new Promise<number>((resolve, reject) => {
const server = net.createServer()
server.once("error", reject)
server.listen(0, () => {
const address = server.address()
if (!address || typeof address === "string") {
server.close(() => reject(new Error("Failed to acquire a free port")))
return
}
server.close((err) => {
if (err) reject(err)
else resolve(address.port)
})
})
})
}
async function waitForHealth(url: string, probe = "/global/health") {
const end = Date.now() + 120_000
let last = ""
while (Date.now() < end) {
try {
const res = await fetch(`${url}${probe}`)
if (res.ok) return
last = `status ${res.status}`
} catch (err) {
last = err instanceof Error ? err.message : String(err)
}
await new Promise((resolve) => setTimeout(resolve, 250))
}
throw new Error(`Timed out waiting for backend health at ${url}${probe}${last ? ` (${last})` : ""}`)
}
async function waitExit(proc: ReturnType<typeof spawn>, timeout = 10_000) {
if (proc.exitCode !== null) return
await Promise.race([
new Promise<void>((resolve) => proc.once("exit", () => resolve())),
new Promise<void>((resolve) => setTimeout(resolve, timeout)),
])
}
const LOG_CAP = 100
function cap(input: string[]) {
if (input.length > LOG_CAP) input.splice(0, input.length - LOG_CAP)
}
function tail(input: string[]) {
return input.slice(-40).join("")
}
export async function startBackend(label: string, input?: { llmUrl?: string }): Promise<Handle> {
const port = await freePort()
const sandbox = await fs.mkdtemp(path.join(os.tmpdir(), `opencode-e2e-${label}-`))
const appDir = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..")
const repoDir = path.resolve(appDir, "../..")
const opencodeDir = path.join(repoDir, "packages", "opencode")
const env = {
...process.env,
OPENCODE_DISABLE_LSP_DOWNLOAD: "true",
OPENCODE_DISABLE_DEFAULT_PLUGINS: "true",
OPENCODE_EXPERIMENTAL_DISABLE_FILEWATCHER: "true",
OPENCODE_TEST_HOME: path.join(sandbox, "home"),
XDG_DATA_HOME: path.join(sandbox, "share"),
XDG_CACHE_HOME: path.join(sandbox, "cache"),
XDG_CONFIG_HOME: path.join(sandbox, "config"),
XDG_STATE_HOME: path.join(sandbox, "state"),
OPENCODE_CLIENT: "app",
OPENCODE_STRICT_CONFIG_DEPS: "true",
OPENCODE_E2E_LLM_URL: input?.llmUrl,
} satisfies Record<string, string | undefined>
const out: string[] = []
const err: string[] = []
const proc = spawn(
"bun",
["run", "--conditions=browser", "./src/index.ts", "serve", "--port", String(port), "--hostname", "127.0.0.1"],
{
cwd: opencodeDir,
env,
stdio: ["ignore", "pipe", "pipe"],
},
)
proc.stdout?.on("data", (chunk) => {
out.push(String(chunk))
cap(out)
})
proc.stderr?.on("data", (chunk) => {
err.push(String(chunk))
cap(err)
})
const url = `http://127.0.0.1:${port}`
try {
await waitForHealth(url)
} catch (error) {
proc.kill("SIGTERM")
await fs.rm(sandbox, { recursive: true, force: true }).catch(() => undefined)
throw new Error(
[
`Failed to start isolated e2e backend for ${label}`,
error instanceof Error ? error.message : String(error),
tail(out),
tail(err),
]
.filter(Boolean)
.join("\n"),
)
}
return {
url,
async stop() {
if (proc.exitCode === null) {
proc.kill("SIGTERM")
await waitExit(proc)
}
if (proc.exitCode === null) {
proc.kill("SIGKILL")
await waitExit(proc)
}
await fs.rm(sandbox, { recursive: true, force: true }).catch(() => undefined)
},
}
}
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