OpenSandbox

What's New

✨ Features

• Retrying pool acquire policies — Kotlin/Java sandbox pools now support RETRY_NEXT_IDLE and RETRY_NEXT_IDLE_THEN_CREATE, allowing acquire to skip stale idle candidates before failing or falling back to direct create. Existing policies keep their current behavior; maxAcquireRetries defaults to 3. #1347
• Sandbox create metrics — Sandbox.create now reports fire-and-forget sandbox.create latency events to the lifecycle server. Reporting never blocks callers and can be disabled with OPENSANDBOX_DISABLE_METRICS=1 or disableMetrics. #1341
• Client IP header — the SDK now best-effort detects the host intranet IPv4 and sends it as OPEN-SANDBOX-CLIENT-IP through the OkHttp transport. User-provided headers are never overwritten. #1326
• Attach to isolated sessions — isolation.attach(sessionId) lets stateless workers rebuild a handle for an existing execd isolated session while that in-memory session is still alive. #1295
• UID mode availability — isolated session responses now expose per-mode setpriv / userns availability, and unavailable requested modes fail with 503 NOT_SUPPORTED. #1320
• Exact snapshot name filtering — snapshot listing now supports an exact name filter. #1301

🐛 Bug Fixes

• Serialization runtime isolation — SDK artifacts now shade kotlinx.serialization into the OpenSandbox namespace and remove it from published POM/BOM dependencies, avoiding runtime ABI conflicts when applications force older serialization runtimes. #1344
• Isolated UID/GID range fix — isolated session UID/GID fields now use a wider integer type so values in the execd uint32 range deserialize and serialize correctly above Int32.MAX_VALUE. #1298

📦 Misc

• Kotlin code-interpreter now lives under the sandbox Kotlin Gradle build while preserving the published com.alibaba.opensandbox:code-interpreter artifact. The sandbox BOM manages sandbox and code-interpreter artifacts together. #1293
• Bumped Kotlin/Java SDK package versions and default User-Agent strings for this release. #1384

👥 Contributors

• @FAUST-BENCHOU
• @Pangjiping
• @jianpingpei
• @ninan-nn
• @ruirui6946