HIGHLY UNSTABLE
Chainable libuv streams.
It is quite easy to write a TCP server/client in libuv. Writing HTTP server/client is a bit harder. Writing HTTP server/client on top of TLS server could be unwieldy.
uv_link_t aims to solve complexity problem that quickly escalates once using
multiple layers of protocols in libuv by providing a way to implement
protocols separately and chain them together in an easy and high-performant way
using very narrow interfaces.
(NOTE: chain is built from links)
(NOTE: many of these API methods have return values, check them!)
First, a uv_stream_t* instance needs to be picked. It will act as a source
link in a chain:
uv_stream_t* stream = ...;
uv_link_source_t source;
uv_link_source_init(uv_default_loop(), &source, stream);A chain can be formed with &source and any other uv_link_t instance:
uv_link_t link;
static uv_link_methods_t methods = {
.read_start = read_start_impl,
.read_stop = read_stop_impl,
.write = write_impl,
.try_write = try_write_impl,
.shutdown = shutdown_impl,
.close = close_impl,
/* These will be used only when chaining two links together */
.alloc_cb_override = alloc_cb_impl,
.read_cb_override = read_cb_impl
};
uv_link_init(&link, &methods);
/* Just like in libuv */
link.alloc_cb = my_alloc_cb;
link.read_cb = my_read_cb;
/* Creating a chain here */
uv_link_chain(&source, &link);
uv_link_read_start(&link);Now comes a funny part, any of these method implementations may hook up into the parent link in a chain to perform their actions:
static int shutdown_impl(uv_link_t* link,
uv_link_t* source,
uv_link_shutdown_cb cb,
void* arg) {
fprintf(stderr, "this will be printed\n");
return uv_link_propagate_shutdown(link->parent, source, cb, arg);
}This software is licensed under the MIT License.
Copyright Fedor Indutny, 2016.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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