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/*
* Copyright (C) 2017 Colin Walters <walters@verbum.org>
*
* SPDX-License-Identifier: LGPL-2.0+
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <gio/gfiledescriptorbased.h>
#include <gio/gunixoutputstream.h>
#ifdef HAVE_LIBSYSTEMD
#include <systemd/sd-journal.h>
#endif
#include "ostree-fetcher-util.h"
#include "otutil.h"
typedef struct
{
GBytes *result_buf;
gboolean result_not_modified;
char *result_etag;
guint64 result_last_modified; /* second since the epoch */
gboolean done;
GError **error;
}
FetchUriSyncData;
static void
fetch_uri_sync_on_complete (GObject *object,
GAsyncResult *result,
gpointer user_data)
{
FetchUriSyncData *data = user_data;
(void)_ostree_fetcher_request_to_membuf_finish ((OstreeFetcher*)object,
result, &data->result_buf,
&data->result_not_modified,
&data->result_etag, &data->result_last_modified,
data->error);
data->done = TRUE;
}
static gboolean
_ostree_fetcher_mirrored_request_to_membuf_once (OstreeFetcher *fetcher,
GPtrArray *mirrorlist,
const char *filename,
OstreeFetcherRequestFlags flags,
const char *if_none_match,
guint64 if_modified_since,
GBytes **out_contents,
gboolean *out_not_modified,
char **out_etag,
guint64 *out_last_modified,
guint64 max_size,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
g_autoptr(GMainContext) mainctx = NULL;
FetchUriSyncData data;
g_assert (error != NULL);
memset (&data, 0, sizeof (data));
if (g_cancellable_set_error_if_cancelled (cancellable, error))
return FALSE;
mainctx = g_main_context_new ();
g_main_context_push_thread_default (mainctx);
data.done = FALSE;
data.error = error;
_ostree_fetcher_request_to_membuf (fetcher, mirrorlist, filename,
flags, if_none_match, if_modified_since,
max_size, OSTREE_FETCHER_DEFAULT_PRIORITY,
cancellable, fetch_uri_sync_on_complete, &data);
while (!data.done)
g_main_context_iteration (mainctx, TRUE);
if (!data.result_buf)
{
if (flags & OSTREE_FETCHER_REQUEST_OPTIONAL_CONTENT)
{
if (g_error_matches (*error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND))
{
g_clear_error (error);
ret = TRUE;
*out_contents = NULL;
if (out_not_modified != NULL)
*out_not_modified = FALSE;
if (out_etag != NULL)
*out_etag = NULL;
if (out_last_modified != NULL)
*out_last_modified = 0;
}
}
goto out;
}
ret = TRUE;
*out_contents = g_steal_pointer (&data.result_buf);
if (out_not_modified != NULL)
*out_not_modified = data.result_not_modified;
if (out_etag != NULL)
*out_etag = g_steal_pointer (&data.result_etag);
if (out_last_modified != NULL)
*out_last_modified = data.result_last_modified;
out:
if (mainctx)
g_main_context_pop_thread_default (mainctx);
g_clear_pointer (&data.result_buf, (GDestroyNotify)g_bytes_unref);
g_clear_pointer (&data.result_etag, g_free);
return ret;
}
gboolean
_ostree_fetcher_mirrored_request_to_membuf (OstreeFetcher *fetcher,
GPtrArray *mirrorlist,
const char *filename,
OstreeFetcherRequestFlags flags,
const char *if_none_match,
guint64 if_modified_since,
guint n_network_retries,
GBytes **out_contents,
gboolean *out_not_modified,
char **out_etag,
guint64 *out_last_modified,
guint64 max_size,
GCancellable *cancellable,
GError **error)
{
g_autoptr(GError) local_error = NULL;
guint n_retries_remaining = n_network_retries;
do
{
g_clear_error (&local_error);
if (_ostree_fetcher_mirrored_request_to_membuf_once (fetcher, mirrorlist,
filename, flags,
if_none_match, if_modified_since,
out_contents, out_not_modified, out_etag,
out_last_modified, max_size,
cancellable, &local_error))
return TRUE;
}
while (_ostree_fetcher_should_retry_request (local_error, n_retries_remaining--));
g_assert (local_error != NULL);
g_propagate_error (error, g_steal_pointer (&local_error));
return FALSE;
}
/* Helper for callers who just want to fetch single one-off URIs */
gboolean
_ostree_fetcher_request_uri_to_membuf (OstreeFetcher *fetcher,
OstreeFetcherURI *uri,
OstreeFetcherRequestFlags flags,
const char *if_none_match,
guint64 if_modified_since,
guint n_network_retries,
GBytes **out_contents,
gboolean *out_not_modified,
char **out_etag,
guint64 *out_last_modified,
guint64 max_size,
GCancellable *cancellable,
GError **error)
{
g_autoptr(GPtrArray) mirrorlist = g_ptr_array_new ();
g_ptr_array_add (mirrorlist, uri); /* no transfer */
return _ostree_fetcher_mirrored_request_to_membuf (fetcher, mirrorlist, NULL, flags,
if_none_match, if_modified_since,
n_network_retries, out_contents,
out_not_modified, out_etag, out_last_modified, max_size,
cancellable, error);
}
#define OSTREE_HTTP_FAILURE_ID SD_ID128_MAKE(f0,2b,ce,89,a5,4e,4e,fa,b3,a9,4a,79,7d,26,20,4a)
void
_ostree_fetcher_journal_failure (const char *remote_name,
const char *url,
const char *msg)
{
/* Sanity - we don't want to log this when doing local/file pulls */
if (!remote_name)
return;
ot_journal_send ("MESSAGE=libostree HTTP error from remote %s for <%s>: %s",
remote_name, url, msg,
"MESSAGE_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(OSTREE_HTTP_FAILURE_ID),
"OSTREE_REMOTE=%s", remote_name,
"OSTREE_URL=%s", url,
"PRIORITY=%i", LOG_ERR,
NULL);
}
/* Check whether a particular operation should be retried. This is entirely
* based on how it failed (if at all) last time, and whether the operation has
* some retries left. The retry count is set when the operation is first
* created, and must be decremented by the caller. (@n_retries_remaining == 0)
* will always return %FALSE from this function.
*
* FIXME: In future, we may decide to use transient failures like this as a hint
* to prioritise other mirrors for a particular pull operation (for example). */
gboolean
_ostree_fetcher_should_retry_request (const GError *error,
guint n_retries_remaining)
{
if (error == NULL)
g_debug ("%s: error: unset, n_retries_remaining: %u",
G_STRFUNC, n_retries_remaining);
else
g_debug ("%s: error: %u:%u %s, n_retries_remaining: %u",
G_STRFUNC, error->domain, error->code, error->message,
n_retries_remaining);
if (error == NULL || n_retries_remaining == 0)
return FALSE;
/* Return TRUE for transient errors. */
if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT) ||
g_error_matches (error, G_IO_ERROR, G_IO_ERROR_HOST_NOT_FOUND) ||
g_error_matches (error, G_IO_ERROR, G_IO_ERROR_HOST_UNREACHABLE) ||
g_error_matches (error, G_IO_ERROR, G_IO_ERROR_PARTIAL_INPUT) ||
#if !GLIB_CHECK_VERSION(2, 44, 0)
g_error_matches (error, G_IO_ERROR, G_IO_ERROR_BROKEN_PIPE) ||
#else
g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CONNECTION_CLOSED) ||
#endif
g_error_matches (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_NOT_FOUND) ||
g_error_matches (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_TEMPORARY_FAILURE))
{
g_debug ("Should retry request (remaining: %u retries), due to transient error: %s",
n_retries_remaining, error->message);
return TRUE;
}
return FALSE;
}
/* Convert a HTTP status code representing an error from libsoup or libcurl to
* a #GIOErrorEnum. This will return %G_IO_ERROR_FAILED if the status code is
* unknown or otherwise unhandled. */
GIOErrorEnum
_ostree_fetcher_http_status_code_to_io_error (guint status_code)
{
switch (status_code)
{
case 403: /* SOUP_STATUS_FORBIDDEN */
case 404: /* SOUP_STATUS_NOT_FOUND */
case 410: /* SOUP_STATUS_GONE */
return G_IO_ERROR_NOT_FOUND;
case 408: /* SOUP_STATUS_REQUEST_TIMEOUT */
return G_IO_ERROR_TIMED_OUT;
default:
return G_IO_ERROR_FAILED;
}
}
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