feat: add Unix domain socket (UDS) listener support#2494
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SBALAVIGNESH123 wants to merge 1 commit intodrogonframework:masterfrom
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feat: add Unix domain socket (UDS) listener support#2494SBALAVIGNESH123 wants to merge 1 commit intodrogonframework:masterfrom
SBALAVIGNESH123 wants to merge 1 commit intodrogonframework:masterfrom
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Add support for listening on Unix domain sockets, enabling lower-latency
same-host communication for reverse proxy setups (e.g., Nginx -> Drogon).
Server API:
app().addListener(/var/run/drogon.sock);
Config file:
{listeners: [{unix_socket: /var/run/drogon.sock}]}
Changes:
- Add HttpAppFramework::addListener(unixSocketPath) overload (POSIX only)
- Add ListenerManager::addUnixListener() with UDS HttpServer creation
- Add ConfigLoader support for 'unix_socket' field in listener config
- Socket file is automatically cleaned up on server stop
- Includes Trantor changes: InetAddress AF_UNIX support, Socket fixes
Addresses drogonframework#1153
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@SBALAVIGNESH123 please make PR to trantor first. |
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Thanks @an-tao! I've submitted the Trantor PR here: an-tao/trantor#399 Once that's merged, I'll update the submodule pointer in this PR to reference the official Trantor commit. |
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Closes #1153
This PR adds native Unix domain socket support to Drogon. Unix domain sockets provide significantly lower latency than TCP for same-host communication, making them ideal for reverse proxy setups like Nginx → Drogon. This has been a requested feature since issue #1153 was opened back in January 2022.
The implementation spans both Drogon and Trantor. On the Trantor side, I extended
InetAddresswith asockaddr_ununion member and added a new constructor for Unix domain socket paths, along with helper methods likeisUnixDomain()andtoUnixPath(). TheSocketclass was updated to useprotocol = 0instead ofIPPROTO_TCPwhen creating AF_UNIX sockets, and I madebind()UDS-aware — it removes any stale socket file before binding and setschmod 0660permissions afterward. Theaccept()path now usessockaddr_storage(110 bytes) instead ofsockaddr_in6(28 bytes) to accommodate the largersockaddr_unstructure, andTCP_NODELAYis correctly skipped for UDS connections since it only applies to TCP.On the Drogon side, I added a new
addListener(const std::string &unixSocketPath)overload toHttpAppFrameworkthat takes just a socket path. TheListenerManagercreates and manages UDS listeners alongside existing TCP listeners, and automatically cleans up socket files viaunlink()when the server stops. JSON configuration is also supported through a"unix_socket"key in the listeners array.Usage is straightforward — either programmatic: