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Allow proxies to delay chunks

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This commit is contained in:
Lorenz Stechauner
2023-01-26 12:46:30 +01:00
parent 8053439212
commit f7a6214dbc
6 changed files with 43 additions and 80 deletions
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60
src/lib/proxy.c
View File

@@ -141,6 +141,7 @@ proxy_ctx_t *proxy_get_by_conf(host_config_t *conf) {
void proxy_unlock_ctx(proxy_ctx_t *ctx) {
int n = (int) ((ctx - proxies) / MAX_PROXY_CNX_PER_HOST);
ctx->in_use = 0;
ctx->client = NULL;
sem_post(&available[n]);
}
@@ -567,62 +568,9 @@ int proxy_init(proxy_ctx_t **proxy_ptr, http_req *req, http_res *res, http_statu
}
int proxy_send(proxy_ctx_t *proxy, sock *client, unsigned long len_to_send, int flags) {
char buffer[CHUNK_SIZE], *ptr;
long ret = 0, snd_len;
do {
snd_len = 0;
if (flags & PROXY_CHUNKED) {
ret = sock_recv_chunk_header(&proxy->proxy);
if (ret < 0) {
if (ret == -1) {
error("Unable to receive from server: Malformed chunk header");
} else {
error("Unable to receive from server");
}
break;
}
len_to_send = ret;
ret = 1;
}
while (snd_len < len_to_send) {
ret = sock_recv(&proxy->proxy, buffer, CHUNK_SIZE < (len_to_send - snd_len) ? CHUNK_SIZE : len_to_send - snd_len, 0);
if (ret <= 0) {
error("Unable to receive from server");
break;
}
ptr = buffer;
long buf_len = ret;
ret = 1;
if (flags & PROXY_CHUNKED) ret = sock_send_chunk_header(client, buf_len);
if (ret <= 0) goto err;
ret = sock_send_x(client, ptr, buf_len, 0);
if (ret <= 0) goto err;
snd_len += ret;
if (flags & PROXY_CHUNKED) ret = sock_send_chunk_trailer(client);
if (ret <= 0) {
err:
error("Unable to send");
break;
}
}
if (ret <= 0) break;
if (flags & PROXY_CHUNKED) if ((ret = sock_recv_chunk_trailer(&proxy->proxy)) == -1) break;
} while ((flags & PROXY_CHUNKED) && len_to_send > 0);
if (ret <= 0) return -1;
if (flags & PROXY_CHUNKED) {
if (sock_send_last_chunk(client) == -1) {
error("Unable to send");
return -1;
}
}
char buffer[CHUNK_SIZE];
if (sock_splice(client, &proxy->proxy, buffer, sizeof(buffer), len_to_send) == -1)
return -1;
return 0;
}

23
src/lib/sock.c
View File

@@ -252,31 +252,26 @@ long sock_splice_chunked(sock *dst, sock *src, void *buf, unsigned long buf_len,
unsigned long send_len = 0, next_len;
do {
ret = sock_recv_chunk_header(src);
if (ret < 0) {
errno = EPROTO;
return -2;
}
if ((ret = sock_recv_chunk_header(src)) == -1)
return -1;
next_len = ret;
if (flags & SOCK_CHUNKED) {
if (flags & SOCK_CHUNKED)
if (sock_send_chunk_header(dst, next_len) == -1)
return -1;
}
if ((ret = sock_splice(dst, src, buf, buf_len, next_len)) < 0)
if ((ret = sock_splice(dst, src, buf, buf_len, next_len)) == -1)
return ret;
send_len += ret;
if (flags & SOCK_CHUNKED) {
if (sock_send_chunk_trailer(dst) == -1)
return -1;
}
if (sock_recv_chunk_trailer(src) == -1)
return -1;
if (flags & SOCK_CHUNKED)
if (sock_send_chunk_trailer(dst) == -1)
return -1;
} while (!(flags & SOCK_SINGLE_CHUNK) && next_len != 0);
return (long) send_len;
@@ -364,7 +359,7 @@ int sock_recv_chunk_trailer(sock *s) {
if (sock_recv_x(s, buf, sizeof(buf), MSG_PEEK) == -1)
return -1;
if (buf[0] != '\r' || buf[1] == '\n') {
if (buf[0] != '\r' || buf[1] != '\n') {
errno = EPROTO;
return -1;
}

7
src/server.c
View File

@@ -198,12 +198,13 @@ static void terminate_gracefully(int sig) {
workers_stop();
workers_destroy();
while (list_size(clients) > 0)
tcp_close(clients[0]);
logger_set_prefix("");
proxy_close_all();
while (list_size(clients) > 0)
tcp_close(clients[0]);
logger_set_prefix("");
async_stop();
}

2
src/worker/chunk_handler.c
View File

@@ -21,7 +21,7 @@ void chunk_handler_func(chunk_ctx_t *ctx) {
// error
error("Unable to splice chunk");
errno = 0;
ctx->err_cb(ctx->client);
ctx->err_cb(ctx);
} else if (sent == 0) {
// last chunk
ctx->client->chunks_transferred = 1;

2
src/worker/func.h
View File

@@ -77,4 +77,6 @@ int ws_handle_connection(client_ctx_t *ctx);
void ws_close(ws_ctx_t *ctx);
int handle_chunks(client_ctx_t *ctx, sock *socket, int flags, void (*next_cb)(chunk_ctx_t *), void (*err_cb)(chunk_ctx_t *));
#endif //SESIMOS_FUNC_H

29
src/worker/proxy_handler.c
View File

@@ -28,14 +28,15 @@ void proxy_handler_func(client_ctx_t *ctx) {
if (ret == 1) {
proxy_unlock_ctx(ctx->proxy);
ctx->proxy->client = NULL;
ctx->proxy = NULL;
} else if (ctx->use_proxy == 0) {
proxy_close(ctx->proxy);
} else if (ctx->use_proxy == 1) {
proxy_handler_2(ctx);
if (proxy_handler_2(ctx) == 1) {
// chunked
return;
}
proxy_unlock_ctx(ctx->proxy);
ctx->proxy->client = NULL;
ctx->proxy = NULL;
} else if (ctx->use_proxy == 2) {
// WebSocket
@@ -107,6 +108,19 @@ static int proxy_handler_1(client_ctx_t *ctx) {
return streq(ctx->req.method, "HEAD") ? 1 : 0;
}
static void proxy_chunk_next_cb(chunk_ctx_t *ctx) {
proxy_unlock_ctx(ctx->client->proxy);
ctx->client->proxy = NULL;
request_complete(ctx->client);
handle_request(ctx->client);
}
static void proxy_chunk_err_cb(chunk_ctx_t *ctx) {
ctx->client->c_keep_alive = 0;
proxy_chunk_next_cb(ctx);
}
static int proxy_handler_2(client_ctx_t *ctx) {
const char *transfer_encoding = http_get_header_field(&ctx->res.hdr, "Transfer-Encoding");
int chunked = strcontains(transfer_encoding, "chunked");
@@ -114,10 +128,13 @@ static int proxy_handler_2(client_ctx_t *ctx) {
const char *content_len = http_get_header_field(&ctx->res.hdr, "Content-Length");
unsigned long len_to_send = (content_len != NULL) ? strtol(content_len, NULL, 10) : 0;
int flags = (chunked ? PROXY_CHUNKED : 0);
int ret = proxy_send(ctx->proxy, &ctx->socket, len_to_send, flags);
if (chunked) {
handle_chunks(ctx, &ctx->proxy->proxy, SOCK_CHUNKED, proxy_chunk_next_cb, proxy_chunk_err_cb);
return 1;
}
if (ret < 0) {
int ret;
if ((ret = proxy_send(ctx->proxy, &ctx->socket, len_to_send, 0)) == -1) {
ctx->c_keep_alive = 0;
}