/* Attempts to push forward the reading side of @msg's I/O. Returns
* %TRUE if it manages to make some progress, and it is likely that
* further progress can be made. Returns %FALSE if it has reached a
* stopping point of some sort (need input from the application,
* socket not readable, read is complete, etc).
*/
static gboolean
io_read (SoupMessage *msg, gboolean blocking,
GCancellable *cancellable, GError **error)
{
SoupMessagePrivate *priv = SOUP_MESSAGE_GET_PRIVATE (msg);
SoupMessageIOData *io = priv->io_data;
guchar *stack_buf = NULL;
gssize nread;
SoupBuffer *buffer;
guint status;
switch (io->read_state) {
case SOUP_MESSAGE_IO_STATE_HEADERS:
if (!read_headers (msg, blocking, cancellable, error))
return FALSE;
status = io->parse_headers_cb (msg, (char *)io->read_header_buf->data,
io->read_header_buf->len,
&io->read_encoding,
io->header_data, error);
g_byte_array_set_size (io->read_header_buf, 0);
if (status != SOUP_STATUS_OK) {
/* Either we couldn't parse the headers, or they
* indicated something that would mean we wouldn't
* be able to parse the body. (Eg, unknown
* Transfer-Encoding.). Skip the rest of the
* reading, and make sure the connection gets
* closed when we're done.
*/
soup_message_set_status (msg, status);
soup_message_headers_append (msg->request_headers,
"Connection", "close");
io->read_state = SOUP_MESSAGE_IO_STATE_FINISHING;
break;
}
if (io->mode == SOUP_MESSAGE_IO_CLIENT &&
SOUP_STATUS_IS_INFORMATIONAL (msg->status_code)) {
if (msg->status_code == SOUP_STATUS_CONTINUE &&
io->write_state == SOUP_MESSAGE_IO_STATE_BLOCKING) {
/* Pause the reader, unpause the writer */
io->read_state =
SOUP_MESSAGE_IO_STATE_BLOCKING;
io->write_state =
SOUP_MESSAGE_IO_STATE_BODY_START;
} else {
/* Just stay in HEADERS */
io->read_state = SOUP_MESSAGE_IO_STATE_HEADERS;
}
/* Informational responses have no bodies, so
* bail out here rather than parsing encoding, etc
*/
soup_message_got_informational (msg);
/* If this was "101 Switching Protocols", then
* the session may have stolen the connection...
*/
if (io != priv->io_data)
return FALSE;
soup_message_cleanup_response (msg);
break;
} else if (io->mode == SOUP_MESSAGE_IO_SERVER &&
soup_message_headers_get_expectations (msg->request_headers) & SOUP_EXPECTATION_CONTINUE) {
/* We must return a status code and response
* headers to the client; either an error to
* be set by a got-headers handler below, or
* else %SOUP_STATUS_CONTINUE otherwise.
*/
io->write_state = SOUP_MESSAGE_IO_STATE_HEADERS;
io->read_state = SOUP_MESSAGE_IO_STATE_BLOCKING;
} else {
io->read_state = SOUP_MESSAGE_IO_STATE_BODY_START;
/* If the client was waiting for a Continue
* but got something else, then it's done
* writing.
*/
if (io->mode == SOUP_MESSAGE_IO_CLIENT &&
io->write_state == SOUP_MESSAGE_IO_STATE_BLOCKING)
io->write_state = SOUP_MESSAGE_IO_STATE_FINISHING;
}
if (io->read_encoding == SOUP_ENCODING_CONTENT_LENGTH) {
SoupMessageHeaders *hdrs =
(io->mode == SOUP_MESSAGE_IO_CLIENT) ?
msg->response_headers : msg->request_headers;
io->read_length = soup_message_headers_get_content_length (hdrs);
if (io->mode == SOUP_MESSAGE_IO_CLIENT &&
!soup_message_is_keepalive (msg)) {
/* Some servers suck and send
* incorrect Content-Length values, so
* allow EOF termination in this case
* (iff the message is too short) too.
*/
io->read_encoding = SOUP_ENCODING_EOF;
}
} else
io->read_length = -1;
soup_message_got_headers (msg);
break;
case SOUP_MESSAGE_IO_STATE_BODY_START:
if (!io->body_istream) {
GInputStream *body_istream = soup_body_input_stream_new (G_INPUT_STREAM (io->istream),
io->read_encoding,
io->read_length);
/* TODO: server-side messages do not have a io->item. This means
* that we cannot use content processors for them right now.
*/
if (io->mode == SOUP_MESSAGE_IO_CLIENT) {
io->body_istream = soup_message_setup_body_istream (body_istream, msg,
io->item->session,
SOUP_STAGE_MESSAGE_BODY);
g_object_unref (body_istream);
} else {
io->body_istream = body_istream;
}
}
if (priv->sniffer) {
SoupContentSnifferStream *sniffer_stream = SOUP_CONTENT_SNIFFER_STREAM (io->body_istream);
const char *content_type;
GHashTable *params;
if (!soup_content_sniffer_stream_is_ready (sniffer_stream, blocking,
cancellable, error))
return FALSE;
content_type = soup_content_sniffer_stream_sniff (sniffer_stream, ¶ms);
soup_message_content_sniffed (msg, content_type, params);
}
io->read_state = SOUP_MESSAGE_IO_STATE_BODY;
break;
case SOUP_MESSAGE_IO_STATE_BODY:
if (priv->chunk_allocator) {
buffer = priv->chunk_allocator (msg, io->read_length, priv->chunk_allocator_data);
if (!buffer) {
g_return_val_if_fail (!io->item || !io->item->new_api, FALSE);
soup_message_io_pause (msg);
return FALSE;
}
} else {
if (!stack_buf)
stack_buf = alloca (RESPONSE_BLOCK_SIZE);
buffer = soup_buffer_new (SOUP_MEMORY_TEMPORARY,
stack_buf,
RESPONSE_BLOCK_SIZE);
}
nread = g_pollable_stream_read (io->body_istream,
(guchar *)buffer->data,
buffer->length,
blocking,
cancellable, error);
if (nread > 0) {
buffer->length = nread;
soup_message_body_got_chunk (io->read_body, buffer);
soup_message_got_chunk (msg, buffer);
soup_buffer_free (buffer);
break;
}
soup_buffer_free (buffer);
if (nread == -1)
return FALSE;
/* else nread == 0 */
io->read_state = SOUP_MESSAGE_IO_STATE_BODY_DONE;
break;
case SOUP_MESSAGE_IO_STATE_BODY_DONE:
io->read_state = SOUP_MESSAGE_IO_STATE_FINISHING;
soup_message_got_body (msg);
break;
case SOUP_MESSAGE_IO_STATE_FINISHING:
io->read_state = SOUP_MESSAGE_IO_STATE_DONE;
if (io->mode == SOUP_MESSAGE_IO_SERVER)
io->write_state = SOUP_MESSAGE_IO_STATE_HEADERS;
break;
default:
g_return_val_if_reached (FALSE);
}
return TRUE;
}
static void
io_read (SoupSocket *sock, SoupMessage *msg)
{
SoupMessagePrivate *priv = SOUP_MESSAGE_GET_PRIVATE (msg);
SoupMessageIOData *io = priv->io_data;
guint status;
read_more:
switch (io->read_state) {
case SOUP_MESSAGE_IO_STATE_NOT_STARTED:
return;
case SOUP_MESSAGE_IO_STATE_HEADERS:
if (!read_metadata (msg, TRUE))
return;
/* We need to "rewind" io->read_meta_buf back one line.
* That SHOULD be two characters (CR LF), but if the
* web server was stupid, it might only be one.
*/
if (io->read_meta_buf->len < 3 ||
io->read_meta_buf->data[io->read_meta_buf->len - 2] == '\n')
io->read_meta_buf->len--;
else
io->read_meta_buf->len -= 2;
io->read_meta_buf->data[io->read_meta_buf->len] = '\0';
status = io->parse_headers_cb (msg, (char *)io->read_meta_buf->data,
io->read_meta_buf->len,
&io->read_encoding,
io->user_data);
g_byte_array_set_size (io->read_meta_buf, 0);
if (status != SOUP_STATUS_OK) {
/* Either we couldn't parse the headers, or they
* indicated something that would mean we wouldn't
* be able to parse the body. (Eg, unknown
* Transfer-Encoding.). Skip the rest of the
* reading, and make sure the connection gets
* closed when we're done.
*/
soup_message_set_status (msg, status);
soup_message_headers_append (msg->request_headers,
"Connection", "close");
io->read_state = SOUP_MESSAGE_IO_STATE_FINISHING;
break;
}
if (io->read_encoding == SOUP_ENCODING_CONTENT_LENGTH) {
SoupMessageHeaders *hdrs =
(io->mode == SOUP_MESSAGE_IO_CLIENT) ?
msg->response_headers : msg->request_headers;
io->read_length = soup_message_headers_get_content_length (hdrs);
}
if (io->mode == SOUP_MESSAGE_IO_CLIENT &&
SOUP_STATUS_IS_INFORMATIONAL (msg->status_code)) {
if (msg->status_code == SOUP_STATUS_CONTINUE &&
io->write_state == SOUP_MESSAGE_IO_STATE_BLOCKING) {
/* Pause the reader, unpause the writer */
io->read_state =
SOUP_MESSAGE_IO_STATE_BLOCKING;
io->write_state =
io_body_state (io->write_encoding);
} else {
/* Just stay in HEADERS */
io->read_state = SOUP_MESSAGE_IO_STATE_HEADERS;
}
} else if (io->mode == SOUP_MESSAGE_IO_SERVER &&
soup_message_headers_get_expectations (msg->request_headers) & SOUP_EXPECTATION_CONTINUE) {
/* The client requested a Continue response. The
* got_headers handler may change this to something
* else though.
*/
soup_message_set_status (msg, SOUP_STATUS_CONTINUE);
io->write_state = SOUP_MESSAGE_IO_STATE_HEADERS;
io->read_state = SOUP_MESSAGE_IO_STATE_BLOCKING;
} else {
io->read_state = io_body_state (io->read_encoding);
/* If the client was waiting for a Continue
* but got something else, then it's done
* writing.
*/
if (io->mode == SOUP_MESSAGE_IO_CLIENT &&
io->write_state == SOUP_MESSAGE_IO_STATE_BLOCKING)
io->write_state = SOUP_MESSAGE_IO_STATE_FINISHING;
}
if (io->mode == SOUP_MESSAGE_IO_CLIENT &&
SOUP_STATUS_IS_INFORMATIONAL (msg->status_code)) {
SOUP_MESSAGE_IO_PREPARE_FOR_CALLBACK;
soup_message_got_informational (msg);
soup_message_cleanup_response (msg);
SOUP_MESSAGE_IO_RETURN_IF_CANCELLED_OR_PAUSED;
} else {
SOUP_MESSAGE_IO_PREPARE_FOR_CALLBACK;
soup_message_got_headers (msg);
SOUP_MESSAGE_IO_RETURN_IF_CANCELLED_OR_PAUSED;
}
break;
case SOUP_MESSAGE_IO_STATE_BLOCKING:
io_write (sock, msg);
/* As in the io_write case, we *must* return here. */
return;
case SOUP_MESSAGE_IO_STATE_BODY:
if (!read_body_chunk (msg))
return;
got_body:
if (!io_handle_sniffing (msg, TRUE)) {
/* If the message was paused (as opposed to
* cancelled), we need to make sure we wind up
* back here when it's unpaused, even if it
* was doing a chunked or EOF-terminated read
* before.
*/
if (io == priv->io_data) {
io->read_state = SOUP_MESSAGE_IO_STATE_BODY;
io->read_encoding = SOUP_ENCODING_CONTENT_LENGTH;
io->read_length = 0;
}
return;
}
io->read_state = SOUP_MESSAGE_IO_STATE_FINISHING;
SOUP_MESSAGE_IO_PREPARE_FOR_CALLBACK;
soup_message_got_body (msg);
SOUP_MESSAGE_IO_RETURN_IF_CANCELLED_OR_PAUSED;
break;
case SOUP_MESSAGE_IO_STATE_CHUNK_SIZE:
if (!read_metadata (msg, FALSE))
return;
io->read_length = strtoul ((char *)io->read_meta_buf->data, NULL, 16);
g_byte_array_set_size (io->read_meta_buf, 0);
if (io->read_length > 0)
io->read_state = SOUP_MESSAGE_IO_STATE_CHUNK;
else
io->read_state = SOUP_MESSAGE_IO_STATE_TRAILERS;
break;
case SOUP_MESSAGE_IO_STATE_CHUNK:
if (!read_body_chunk (msg))
return;
io->read_state = SOUP_MESSAGE_IO_STATE_CHUNK_END;
break;
case SOUP_MESSAGE_IO_STATE_CHUNK_END:
if (!read_metadata (msg, FALSE))
return;
g_byte_array_set_size (io->read_meta_buf, 0);
io->read_state = SOUP_MESSAGE_IO_STATE_CHUNK_SIZE;
break;
case SOUP_MESSAGE_IO_STATE_TRAILERS:
if (!read_metadata (msg, FALSE))
return;
if (io->read_meta_buf->len <= SOUP_MESSAGE_IO_EOL_LEN)
goto got_body;
/* FIXME: process trailers */
g_byte_array_set_size (io->read_meta_buf, 0);
break;
case SOUP_MESSAGE_IO_STATE_FINISHING:
if (io->read_tag) {
g_signal_handler_disconnect (io->sock, io->read_tag);
io->read_tag = 0;
}
io->read_state = SOUP_MESSAGE_IO_STATE_DONE;
if (io->mode == SOUP_MESSAGE_IO_SERVER) {
io->write_state = SOUP_MESSAGE_IO_STATE_HEADERS;
io_write (sock, msg);
} else
soup_message_io_finished (msg);
return;
case SOUP_MESSAGE_IO_STATE_DONE:
default:
g_return_if_reached ();
}
goto read_more;
}