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// This is an open source non-commercial project. Dear PVS-Studio, please check
// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
#include <assert.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <uv.h>
#include "nvim/event/loop.h"
#include "nvim/event/wstream.h"
#include "nvim/log.h"
#include "nvim/memory.h"
#include "nvim/vim.h"
#define DEFAULT_MAXMEM 1024 * 1024 * 2000
typedef struct {
Stream *stream;
WBuffer *buffer;
uv_write_t uv_req;
} WRequest;
#ifdef INCLUDE_GENERATED_DECLARATIONS
# include "event/wstream.c.generated.h"
#endif
void wstream_init_fd(Loop *loop, Stream *stream, int fd, size_t maxmem)
FUNC_ATTR_NONNULL_ARG(1) FUNC_ATTR_NONNULL_ARG(2)
{
stream_init(loop, stream, fd, NULL);
wstream_init(stream, maxmem);
}
void wstream_init_stream(Stream *stream, uv_stream_t *uvstream, size_t maxmem)
FUNC_ATTR_NONNULL_ARG(1) FUNC_ATTR_NONNULL_ARG(2)
{
stream_init(NULL, stream, -1, uvstream);
wstream_init(stream, maxmem);
}
void wstream_init(Stream *stream, size_t maxmem)
{
stream->maxmem = maxmem ? maxmem : DEFAULT_MAXMEM;
}
/// Sets a callback that will be called on completion of a write request,
/// indicating failure/success.
///
/// This affects all requests currently in-flight as well. Overwrites any
/// possible earlier callback.
///
/// @note This callback will not fire if the write request couldn't even be
/// queued properly (i.e.: when `wstream_write() returns an error`).
///
/// @param stream The `Stream` instance
/// @param cb The callback
void wstream_set_write_cb(Stream *stream, stream_write_cb cb, void *data)
FUNC_ATTR_NONNULL_ARG(1, 2)
{
stream->write_cb = cb;
stream->cb_data = data;
}
/// Queues data for writing to the backing file descriptor of a `Stream`
/// instance. This will fail if the write would cause the Stream use more
/// memory than specified by `maxmem`.
///
/// @param stream The `Stream` instance
/// @param buffer The buffer which contains data to be written
/// @return false if the write failed
bool wstream_write(Stream *stream, WBuffer *buffer)
FUNC_ATTR_NONNULL_ALL
{
assert(stream->maxmem);
// This should not be called after a stream was freed
assert(!stream->closed);
if (stream->curmem > stream->maxmem) {
goto err;
}
stream->curmem += buffer->size;
WRequest *data = xmalloc(sizeof(WRequest));
data->stream = stream;
data->buffer = buffer;
data->uv_req.data = data;
uv_buf_t uvbuf;
uvbuf.base = buffer->data;
uvbuf.len = UV_BUF_LEN(buffer->size);
if (uv_write(&data->uv_req, stream->uvstream, &uvbuf, 1, write_cb)) {
xfree(data);
goto err;
}
stream->pending_reqs++;
return true;
err:
wstream_release_wbuffer(buffer);
return false;
}
/// Creates a WBuffer object for holding output data. Instances of this
/// object can be reused across Stream instances, and the memory is freed
/// automatically when no longer needed(it tracks the number of references
/// internally)
///
/// @param data Data stored by the WBuffer
/// @param size The size of the data array
/// @param refcount The number of references for the WBuffer. This will be used
/// by Stream instances to decide when a WBuffer should be freed.
/// @param cb Pointer to function that will be responsible for freeing
/// the buffer data(passing 'free' will work as expected).
/// @return The allocated WBuffer instance
WBuffer *wstream_new_buffer(char *data, size_t size, size_t refcount, wbuffer_data_finalizer cb)
FUNC_ATTR_NONNULL_ARG(1)
{
WBuffer *rv = xmalloc(sizeof(WBuffer));
rv->size = size;
rv->refcount = refcount;
rv->cb = cb;
rv->data = data;
return rv;
}
static void write_cb(uv_write_t *req, int status)
{
WRequest *data = req->data;
data->stream->curmem -= data->buffer->size;
wstream_release_wbuffer(data->buffer);
if (data->stream->write_cb) {
data->stream->write_cb(data->stream, data->stream->cb_data, status);
}
data->stream->pending_reqs--;
if (data->stream->closed && data->stream->pending_reqs == 0) {
// Last pending write, free the stream;
stream_close_handle(data->stream);
}
xfree(data);
}
void wstream_release_wbuffer(WBuffer *buffer)
FUNC_ATTR_NONNULL_ALL
{
if (!--buffer->refcount) {
if (buffer->cb) {
buffer->cb(buffer->data);
}
xfree(buffer);
}
}
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