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Add a variant of evhttp_send_reply_chunk() with a callback on evhttp_write_buffer()

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evhttp_write_buffer() used by evhttp_send_reply_chunk() can take callback
executed when (part of) the buffer has been written. Using this callback to
schedule the next chunk avoids buffering large amounts of data in memory.
This commit is contained in:
Julien BLACHE 2009-05-02 20:40:11 +02:00 committed by Balint Reczey
parent a60632a1ec
commit 8d8decf114
2 changed files with 26 additions and 2 deletions
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10
http.c
View File

@ -2658,7 +2658,8 @@ evhttp_send_reply_start(struct evhttp_request *req, int code,
}
void
evhttp_send_reply_chunk(struct evhttp_request *req, struct evbuffer *databuf)
evhttp_send_reply_chunk_with_cb(struct evhttp_request *req, struct evbuffer *databuf,
void (*cb)(struct evhttp_connection *, void *), void *arg)
{
struct evhttp_connection *evcon = req->evcon;
struct evbuffer *output;
@ -2680,9 +2681,14 @@ evhttp_send_reply_chunk(struct evhttp_request *req, struct evbuffer *databuf)
if (req->chunked) {
evbuffer_add(output, "\r\n", 2);
}
evhttp_write_buffer(evcon, NULL, NULL);
evhttp_write_buffer(evcon, cb, arg);
}
void
evhttp_send_reply_chunk(struct evhttp_request *req, struct evbuffer *databuf)
{
evhttp_send_reply_chunk_with_cb(req, databuf, NULL, NULL);
}
void
evhttp_send_reply_end(struct evhttp_request *req)
{

18
include/event2/http.h
View File

@ -38,6 +38,7 @@ extern "C" {
struct evbuffer;
struct event_base;
struct bufferevent;
struct evhttp_connection;
/** @file event2/http.h
*
@ -407,6 +408,23 @@ void evhttp_send_reply_start(struct evhttp_request *req, int code,
*/
void evhttp_send_reply_chunk(struct evhttp_request *req,
struct evbuffer *databuf);
/**
Send another data chunk as part of an ongoing chunked reply.
The reply chunk consists of the data in databuf. After calling
evhttp_send_reply_chunk() databuf will be empty, but the buffer is
still owned by the caller and needs to be deallocated by the caller
if necessary.
@param req a request object
@param databuf the data chunk to send as part of the reply.
@param cb callback funcion
@param call back's argument.
*/
void evhttp_send_reply_chunk_with_cb(struct evhttp_request *, struct evbuffer *,
void (*cb)(struct evhttp_connection *, void *), void *arg);
/**
Complete a chunked reply, freeing the request as appropriate.