$ show tdlib/td
TDLib (Telegram Database Library) is a cross-platform C++ library for building Telegram clients. It implements the full MTProto protocol stack, including encryption, transport (TCP, HTTP, TLS), and proxy support (SOCKS5, HTTP). The library manages all Telegram data types (messages, users, dialogs, files, etc.) with local persistence via SQLite and a custom binary log for crash-safe state. It provides a clean JSON-based API (td_json_client) for usage from any language, along with native bindings for Java, .NET, C, and more. The architecture is actor-based (tdactor), enabling high concurrency without explicit thread management. The codebase also includes code generation tools that produce serialization code from Telegram's Type Language (TL) schema, ensuring type safety and protocol compliance.
The LLM identified 5 files worth highlighting for reuse:
A wait-free hash map implementation optimized for fast reads in multi-threaded environments. Uses lock-free techniques (hazard pointers, epoch-based reclamation) to avoid blocking. Suitable for high-performance caches or registries where readers dominate.
A bounded multi-producer multi-consumer queue using a lock-free design. Supports high-throughput message passing between threads. Includes variants with blocking (MpmcPollableQueue) and non-blocking (MpmcLinkQueue) operations.
A standalone URL parser that handles RFC 3986 compliant URLs. Extracts scheme, host, port, path, query, fragment. Used for Telegram-related URL resolution but is generic and well-tested with a fuzz test (test/fuzz_url.cpp).
A lightweight actor framework providing Actor base class, ActorOwn/ActorShared for ownership, send_closure for message passing, and Scheduler for execution. Actors are single-threaded but can be migrated across schedulers. Includes support for timeouts, promises, and multi-promises. Could be extracted for use in other event-driven C++ projects.
A binary log implementation for crash-safe event persistence. Supports synchronous and concurrent writing, CRC32 validation, and recovery from corruption. Can be used as a foundation for event sourcing systems or write-ahead logs in other C++ applications.