| /* |
| * streams.c : stream encapsulation routines for the ra_svn protocol |
| * |
| * ==================================================================== |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * ==================================================================== |
| */ |
| |
| |
| |
| #include <apr_general.h> |
| #include <apr_network_io.h> |
| #include <apr_poll.h> |
| |
| #include "svn_types.h" |
| #include "svn_error.h" |
| #include "svn_pools.h" |
| #include "svn_io.h" |
| #include "svn_private_config.h" |
| |
| #include "private/svn_io_private.h" |
| |
| #include "ra_svn.h" |
| |
| struct svn_ra_svn__stream_st { |
| svn_stream_t *in_stream; |
| svn_stream_t *out_stream; |
| void *timeout_baton; |
| ra_svn_timeout_fn_t timeout_fn; |
| }; |
| |
| typedef struct sock_baton_t { |
| apr_socket_t *sock; |
| apr_pool_t *pool; |
| } sock_baton_t; |
| |
| |
| /* Returns TRUE if PFD has pending data, FALSE otherwise. */ |
| static svn_boolean_t pending(apr_pollfd_t *pfd, apr_pool_t *pool) |
| { |
| apr_status_t status; |
| int n; |
| |
| pfd->p = pool; |
| pfd->reqevents = APR_POLLIN; |
| status = apr_poll(pfd, 1, &n, 0); |
| return (status == APR_SUCCESS && n); |
| } |
| |
| /* Functions to implement a file backed svn_ra_svn__stream_t. */ |
| |
| /* Implements ra_svn_timeout_fn_t */ |
| static void |
| file_timeout_cb(void *baton, apr_interval_time_t interval) |
| { |
| apr_file_t *f = baton; |
| |
| if (f) |
| apr_file_pipe_timeout_set(f, interval); |
| } |
| |
| svn_ra_svn__stream_t * |
| svn_ra_svn__stream_from_streams(svn_stream_t *in_stream, |
| svn_stream_t *out_stream, |
| apr_pool_t *pool) |
| { |
| apr_file_t *file; |
| |
| /* If out_stream is backed by an apr_file (e.g. an PIPE) we |
| provide a working callback, otherwise the callback ignores |
| the timeout. |
| |
| The callback is used to make the write non-blocking on |
| some error scenarios. ### This (legacy) usage |
| breaks the stream promise */ |
| file = svn_stream__aprfile(out_stream); |
| |
| return svn_ra_svn__stream_create(in_stream, out_stream, |
| file, file_timeout_cb, |
| pool); |
| } |
| |
| /* Functions to implement a socket backed svn_ra_svn__stream_t. */ |
| |
| /* Implements svn_read_fn_t */ |
| static svn_error_t * |
| sock_read_cb(void *baton, char *buffer, apr_size_t *len) |
| { |
| sock_baton_t *b = baton; |
| apr_status_t status; |
| apr_interval_time_t interval; |
| |
| status = apr_socket_timeout_get(b->sock, &interval); |
| if (status) |
| return svn_error_wrap_apr(status, _("Can't get socket timeout")); |
| |
| /* Always block on read. |
| * During pipelining, we set the timeout to 0 for some write |
| * operations so that we can try them without blocking. If APR had |
| * separate timeouts for read and write, we would only set the |
| * write timeout, but it doesn't. So here, we revert back to blocking. |
| */ |
| apr_socket_timeout_set(b->sock, -1); |
| status = apr_socket_recv(b->sock, buffer, len); |
| apr_socket_timeout_set(b->sock, interval); |
| |
| if (status && !APR_STATUS_IS_EOF(status)) |
| return svn_error_wrap_apr(status, _("Can't read from connection")); |
| return SVN_NO_ERROR; |
| } |
| |
| /* Implements svn_write_fn_t */ |
| static svn_error_t * |
| sock_write_cb(void *baton, const char *buffer, apr_size_t *len) |
| { |
| sock_baton_t *b = baton; |
| apr_status_t status = apr_socket_send(b->sock, buffer, len); |
| if (status) |
| return svn_error_wrap_apr(status, _("Can't write to connection")); |
| return SVN_NO_ERROR; |
| } |
| |
| /* Implements ra_svn_timeout_fn_t */ |
| static void |
| sock_timeout_cb(void *baton, apr_interval_time_t interval) |
| { |
| sock_baton_t *b = baton; |
| apr_socket_timeout_set(b->sock, interval); |
| } |
| |
| /* Implements svn_stream_data_available_fn_t */ |
| static svn_error_t * |
| sock_pending_cb(void *baton, |
| svn_boolean_t *data_available) |
| { |
| sock_baton_t *b = baton; |
| apr_pollfd_t pfd; |
| |
| pfd.desc_type = APR_POLL_SOCKET; |
| pfd.desc.s = b->sock; |
| |
| *data_available = pending(&pfd, b->pool); |
| |
| svn_pool_clear(b->pool); |
| |
| return SVN_NO_ERROR; |
| } |
| |
| svn_ra_svn__stream_t * |
| svn_ra_svn__stream_from_sock(apr_socket_t *sock, |
| apr_pool_t *result_pool) |
| { |
| sock_baton_t *b = apr_palloc(result_pool, sizeof(*b)); |
| svn_stream_t *sock_stream; |
| |
| b->sock = sock; |
| b->pool = svn_pool_create(result_pool); |
| |
| sock_stream = svn_stream_create(b, result_pool); |
| |
| svn_stream_set_read2(sock_stream, sock_read_cb, NULL /* use default */); |
| svn_stream_set_write(sock_stream, sock_write_cb); |
| svn_stream_set_data_available(sock_stream, sock_pending_cb); |
| |
| return svn_ra_svn__stream_create(sock_stream, sock_stream, |
| b, sock_timeout_cb, result_pool); |
| } |
| |
| svn_ra_svn__stream_t * |
| svn_ra_svn__stream_create(svn_stream_t *in_stream, |
| svn_stream_t *out_stream, |
| void *timeout_baton, |
| ra_svn_timeout_fn_t timeout_cb, |
| apr_pool_t *pool) |
| { |
| svn_ra_svn__stream_t *s = apr_palloc(pool, sizeof(*s)); |
| s->in_stream = in_stream; |
| s->out_stream = out_stream; |
| s->timeout_baton = timeout_baton; |
| s->timeout_fn = timeout_cb; |
| return s; |
| } |
| |
| svn_error_t * |
| svn_ra_svn__stream_write(svn_ra_svn__stream_t *stream, |
| const char *data, apr_size_t *len) |
| { |
| return svn_error_trace(svn_stream_write(stream->out_stream, data, len)); |
| } |
| |
| svn_error_t * |
| svn_ra_svn__stream_read(svn_ra_svn__stream_t *stream, char *data, |
| apr_size_t *len) |
| { |
| SVN_ERR(svn_stream_read2(stream->in_stream, data, len)); |
| |
| if (*len == 0) |
| return svn_error_create(SVN_ERR_RA_SVN_CONNECTION_CLOSED, NULL, NULL); |
| |
| return SVN_NO_ERROR; |
| } |
| |
| void |
| svn_ra_svn__stream_timeout(svn_ra_svn__stream_t *stream, |
| apr_interval_time_t interval) |
| { |
| stream->timeout_fn(stream->timeout_baton, interval); |
| } |
| |
| svn_error_t * |
| svn_ra_svn__stream_data_available(svn_ra_svn__stream_t *stream, |
| svn_boolean_t *data_available) |
| { |
| return svn_error_trace( |
| svn_stream_data_available(stream->in_stream, |
| data_available)); |
| } |