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RetroArch/tasks/task_cloudsync.c
Alex Kiraly c644487d8f
Enable Cloud Sync by default on Linux builds with network (#16456) 
* Enable by cloudsync by default on Linux builds with network

* Make WebDAV C89-friendly
2024-04-23 16:57:38 -07:00

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/* RetroArch - A frontend for libretro.
*
* RetroArch is free software: you can redistribute it and/or modify it under the terms
* of the GNU General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* RetroArch 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with RetroArch.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include <features/features_cpu.h>
#include <file/file_path.h>
#include <formats/rjson.h>
#include <lists/dir_list.h>
#include <lists/file_list.h>
#include <lrc_hash.h>
#include <streams/file_stream.h>
#include <string/stdstring.h>
#include <time/rtime.h>
#include <retro_inline.h>
#include "../configuration.h"
#include "../file_path_special.h"
#include "../network/cloud_sync_driver.h"
#include "../paths.h"
#include "../tasks/tasks_internal.h"
#include "../verbosity.h"
#define CSPFX "[CloudSync] "
#define MANIFEST_FILENAME_LOCAL "manifest.local"
#define MANIFEST_FILENAME_SERVER "manifest.server"
#define CS_FILE_HASH(item_file) ((char*)((item_file) ? ((item_file)->userdata) : (NULL)))
#define CS_FILE_KEY(item_file) ((item_file) ? ((item_file)->alt) : (NULL))
#define CS_FILE_DELETED(item_file) (string_is_empty(CS_FILE_HASH(item_file)))
enum task_cloud_sync_phase
{
CLOUD_SYNC_PHASE_BEGIN,
CLOUD_SYNC_PHASE_FETCH_SERVER_MANIFEST,
CLOUD_SYNC_PHASE_READ_LOCAL_MANIFEST,
CLOUD_SYNC_PHASE_BUILD_CURRENT_MANIFEST,
CLOUD_SYNC_PHASE_DIFF,
CLOUD_SYNC_PHASE_UPDATE_MANIFESTS,
CLOUD_SYNC_PHASE_END
};
typedef struct
{
enum task_cloud_sync_phase phase;
bool waiting;
file_list_t *server_manifest;
size_t server_idx;
file_list_t *local_manifest;
size_t local_idx;
file_list_t *current_manifest;
size_t current_idx;
file_list_t *updated_server_manifest;
/* local manifest is sometimes different due to conflicts */
file_list_t *updated_local_manifest;
bool need_manifest_uploaded;
bool failures;
bool conflicts;
} task_cloud_sync_state_t;
static void task_cloud_sync_begin_handler(void *user_data, const char *path, bool success, RFILE *file)
{
retro_task_t *task = (retro_task_t *)user_data;
task_cloud_sync_state_t *sync_state = NULL;
if (!task)
return;
if (!(sync_state = (task_cloud_sync_state_t *)task->state))
return;
sync_state->waiting = false;
if (success)
{
RARCH_LOG(CSPFX "begin succeeded\n");
sync_state->phase = CLOUD_SYNC_PHASE_FETCH_SERVER_MANIFEST;
}
else
{
RARCH_WARN(CSPFX "begin failed\n");
task_set_title(task, strdup("Cloud Sync failed"));
task_set_finished(task, true);
}
}
static bool tcs_object_member_handler(void *ctx, const char *s, size_t len)
{
file_list_t *list = (file_list_t *)ctx;
struct item_file *item = &list->list[list->size - 1];
if (string_is_equal(s, "path"))
item->type = 1;
else
item->type = 0;
return true;
}
static bool tcs_string_handler(void *ctx, const char *s, size_t len)
{
file_list_t *list = (file_list_t *)ctx;
size_t idx = list->size - 1;
struct item_file *item = &list->list[idx];
if (item->type)
file_list_set_alt_at_offset(list, idx, s);
else
list->list[idx].userdata = strdup(s);
return true;
}
static bool tcs_start_object_handler(void *ctx)
{
file_list_t *list = (file_list_t *)ctx;
file_list_append(list, NULL, NULL, 0, 0, 0);
return true;
}
static bool tcs_end_object_handler(void *ctx)
{
file_list_t *list = (file_list_t *)ctx;
struct item_file *item = &list->list[list->size - 1];
if (!CS_FILE_KEY(item))
list->size--;
else
item->type = 0;
return true;
}
static file_list_t *task_cloud_sync_create_manifest(RFILE *file)
{
file_list_t *list = NULL;
rjson_t *json = NULL;
if (!(list = (file_list_t *)calloc(1, sizeof(file_list_t))))
return NULL;
if (!(json = rjson_open_rfile(file)))
return NULL;
rjson_parse(json, list,
tcs_object_member_handler,
tcs_string_handler,
NULL,
tcs_start_object_handler,
tcs_end_object_handler,
NULL,
NULL,
NULL,
NULL);
rjson_free(json);
file_list_sort_on_alt(list);
RARCH_LOG(CSPFX "created manifest with %u files\n", list->size);
return list;
}
static void task_cloud_sync_manifest_filename(char *path, size_t len, bool server)
{
settings_t *settings = config_get_ptr();
const char *path_dir_core_assets = settings->paths.directory_core_assets;
fill_pathname_join_special(path,
path_dir_core_assets,
server ? MANIFEST_FILENAME_SERVER : MANIFEST_FILENAME_LOCAL,
len);
}
static void task_cloud_sync_manifest_handler(void *user_data, const char *path,
bool success, RFILE *file)
{
task_cloud_sync_state_t *sync_state = (task_cloud_sync_state_t *)user_data;
if (!sync_state)
return;
sync_state->waiting = false;
if (!success)
{
RARCH_WARN(CSPFX "server manifest fetch failed\n");
sync_state->failures = true;
sync_state->phase = CLOUD_SYNC_PHASE_END;
return;
}
RARCH_LOG(CSPFX "server manifest fetch succeeded\n");
/* it is valid for there not to be a server manifest */
if (file)
{
sync_state->server_manifest = task_cloud_sync_create_manifest(file);
filestream_close(file);
}
sync_state->phase = CLOUD_SYNC_PHASE_READ_LOCAL_MANIFEST;
}
static void task_cloud_sync_fetch_server_manifest(task_cloud_sync_state_t *sync_state)
{
char manifest_path[PATH_MAX_LENGTH];
task_cloud_sync_manifest_filename(manifest_path, sizeof(manifest_path), true);
sync_state->waiting = true;
if (!cloud_sync_read(MANIFEST_FILENAME_SERVER, manifest_path, task_cloud_sync_manifest_handler, sync_state))
{
RARCH_WARN(CSPFX "could not read server manifest\n");
sync_state->waiting = false;
sync_state->phase = CLOUD_SYNC_PHASE_END;
}
}
static void task_cloud_sync_read_local_manifest(task_cloud_sync_state_t *sync_state)
{
char manifest_path[PATH_MAX_LENGTH];
task_cloud_sync_manifest_filename(manifest_path, sizeof(manifest_path), false);
/* it is valid for there not to be a local manifest, if we have never done a sync before */
if (path_is_valid(manifest_path))
{
RFILE *rfile = filestream_open(manifest_path,
RETRO_VFS_FILE_ACCESS_READ, RETRO_VFS_FILE_ACCESS_HINT_NONE);
if (rfile)
{
RARCH_WARN(CSPFX "opened local manifest\n");
sync_state->local_manifest = task_cloud_sync_create_manifest(rfile);
filestream_close(rfile);
}
}
sync_state->phase = CLOUD_SYNC_PHASE_BUILD_CURRENT_MANIFEST;
}
/* takes the filename in manifest format, e.g. "config/retroarch.cfg" */
static bool task_cloud_sync_should_ignore_file(const char *filename)
{
if (string_starts_with(filename, "config/"))
{
const char *path = filename + STRLEN_CONST("config/");
/* need to exclude FILE_PATH_MAIN_CONFIG, those don't get sync'd */
if (string_is_equal(path, FILE_PATH_MAIN_CONFIG))
return true;
/* ignore playlist files */
if (string_starts_with(path, "content_") && string_ends_with(path, FILE_PATH_LPL_EXTENSION))
return true;
}
if (string_ends_with(filename, "/.DS_Store"))
return true;
return false;
}
static void task_cloud_sync_manifest_append_dir(file_list_t *manifest,
const char *dir_fullpath, char *dir_name)
{
size_t i;
struct string_list *dir_list;
char dir_fullpath_slash[PATH_MAX_LENGTH];
strlcpy(dir_fullpath_slash, dir_fullpath, sizeof(dir_fullpath_slash));
fill_pathname_slash(dir_fullpath_slash, sizeof(dir_fullpath_slash));
dir_list = dir_list_new(dir_fullpath_slash, NULL, false, true, true, true);
if (dir_list->size == 0)
{
string_list_free(dir_list);
return;
}
file_list_reserve(manifest, manifest->size + dir_list->size);
for (i = 0; i < dir_list->size; i++)
{
size_t idx = manifest->size;
const char *full_path = dir_list->elems[i].data;
char relative_path[PATH_MAX_LENGTH];
char alt[PATH_MAX_LENGTH];
path_relative_to(relative_path, full_path, dir_fullpath_slash, sizeof(relative_path));
fill_pathname_join_special(alt, dir_name, relative_path, sizeof(alt));
if (task_cloud_sync_should_ignore_file(alt))
continue;
file_list_append(manifest, full_path, NULL, 0, 0, 0);
file_list_set_alt_at_offset(manifest, idx, alt);
}
}
static struct string_list *task_cloud_sync_directory_map(void)
{
static struct string_list *list = NULL;
if (!list)
{
union string_list_elem_attr attr = {0};
char dir[PATH_MAX_LENGTH];
list = string_list_new();
string_list_append(list, "config", attr);
fill_pathname_application_special(dir,
sizeof(dir), APPLICATION_SPECIAL_DIRECTORY_CONFIG);
list->elems[list->size - 1].userdata = strdup(dir);
string_list_append(list, "saves", attr);
list->elems[list->size - 1].userdata = strdup(dir_get_ptr(RARCH_DIR_SAVEFILE));
string_list_append(list, "states", attr);
list->elems[list->size - 1].userdata = strdup(dir_get_ptr(RARCH_DIR_SAVESTATE));
}
return list;
}
static void task_cloud_sync_build_current_manifest(task_cloud_sync_state_t *sync_state)
{
struct string_list *dirlist = task_cloud_sync_directory_map();
size_t i;
if (!(sync_state->current_manifest = (file_list_t *)calloc(1, sizeof(file_list_t))))
{
sync_state->phase = CLOUD_SYNC_PHASE_END;
return;
}
if (!(sync_state->updated_server_manifest = (file_list_t *)calloc(1, sizeof(file_list_t))))
{
sync_state->phase = CLOUD_SYNC_PHASE_END;
return;
}
if (!(sync_state->updated_local_manifest = (file_list_t *)calloc(1, sizeof(file_list_t))))
{
sync_state->phase = CLOUD_SYNC_PHASE_END;
return;
}
for (i = 0; i < dirlist->size; i++)
task_cloud_sync_manifest_append_dir(sync_state->current_manifest,
dirlist->elems[i].userdata, dirlist->elems[i].data);
file_list_sort_on_alt(sync_state->current_manifest);
sync_state->phase = CLOUD_SYNC_PHASE_DIFF;
RARCH_LOG(CSPFX "created in-memory manifest of current disk state\n");
}
static void task_cloud_sync_update_progress(retro_task_t *task)
{
task_cloud_sync_state_t *sync_state = NULL;
unsigned long val = 0;
unsigned long count = 0;
if (!task)
return;
if (!(sync_state = (task_cloud_sync_state_t *)task->state))
return;
val = sync_state->server_idx + sync_state->local_idx + sync_state->current_idx;
if (sync_state->server_manifest)
count += sync_state->server_manifest->size;
if (sync_state->local_manifest)
count += sync_state->local_manifest->size;
if (sync_state->current_manifest)
count += sync_state->current_manifest->size;
if (count != 0)
task_set_progress(task, (val * 100) / count);
else
task_set_progress(task, 100);
}
static void task_cloud_sync_add_to_updated_manifest(task_cloud_sync_state_t *sync_state, const char *key, char *hash, bool server)
{
file_list_t *list = server ? sync_state->updated_server_manifest : sync_state->updated_local_manifest;
size_t idx = list->size;
file_list_append(list, NULL, NULL, 0, 0, 0);
file_list_set_alt_at_offset(list, idx, key);
list->list[idx].userdata = hash;
}
static INLINE int task_cloud_sync_key_cmp(struct item_file *left, struct item_file *right)
{
char *left_key = CS_FILE_KEY(left);
char *right_key = CS_FILE_KEY(right);
if (!left_key && !right_key)
return 0;
else if (!left_key)
return 1;
else if (!right_key)
return -1;
else
return strcasecmp(left_key, right_key);
}
static char *task_cloud_sync_md5_rfile(RFILE *file)
{
MD5_CTX md5;
int rv;
char *hash = malloc(33);
unsigned char buf[4096];
unsigned char digest[16];
if (!hash)
return NULL;
MD5_Init(&md5);
do
{
rv = (int)filestream_read(file, buf, sizeof(buf));
if (rv > 0)
MD5_Update(&md5, buf, rv);
} while (rv > 0);
MD5_Final(digest, &md5);
snprintf(hash, 33, "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
digest[0], digest[1], digest[2], digest[3], digest[4], digest[5], digest[6], digest[7],
digest[8], digest[9], digest[10], digest[11], digest[12], digest[13], digest[14], digest[15]
);
return hash;
}
/* don't pass a server/local item_file to this, only current has ->path set */
static void task_cloud_sync_backup_file(struct item_file *file)
{
struct tm tm_;
size_t len;
char backup_dir[PATH_MAX_LENGTH];
char new_path[PATH_MAX_LENGTH];
char new_dir[PATH_MAX_LENGTH];
settings_t *settings = config_get_ptr();
const char *path_dir_core_assets = settings->paths.directory_core_assets;
time_t cur_time = time(NULL);
rtime_localtime(&cur_time, &tm_);
fill_pathname_join_special(backup_dir,
path_dir_core_assets,
"cloud_backups",
sizeof(backup_dir));
len = fill_pathname_join_special(new_path,
backup_dir,
CS_FILE_KEY(file),
sizeof(new_path));
strftime(new_path + len, sizeof(new_path) - len, "-%y%m%d-%H%M%S", &tm_);
fill_pathname_basedir(new_dir, new_path, sizeof(new_dir));
path_mkdir(new_dir);
filestream_rename(file->path, new_path);
}
static void task_cloud_sync_fetch_cb(void *user_data, const char *path, bool success, RFILE *file)
{
task_cloud_sync_state_t *sync_state = (task_cloud_sync_state_t *)user_data;
char *hash = NULL;
if (!sync_state)
return;
sync_state->waiting = false;
if (success && file)
{
hash = task_cloud_sync_md5_rfile(file);
filestream_close(file);
RARCH_LOG(CSPFX "successfully fetched %s\n", path);
task_cloud_sync_add_to_updated_manifest(sync_state, path, hash, false);
}
else
{
/* on failure, don't add it to local manifest, that will cause a fetch again next time */
if (!success)
RARCH_WARN(CSPFX "failed to fetch %s\n", path);
else
RARCH_WARN(CSPFX "failed to write file from server: %s\n", path);
sync_state->failures = true;
return;
}
}
static void task_cloud_sync_fetch_server_file(task_cloud_sync_state_t *sync_state)
{
struct string_list *dirlist = task_cloud_sync_directory_map();
struct item_file *server_file = &sync_state->server_manifest->list[sync_state->server_idx];
const char *key = CS_FILE_KEY(server_file);
const char *path = strchr(key, PATH_DEFAULT_SLASH_C()) + 1;
char directory[PATH_MAX_LENGTH];
char filename[PATH_MAX_LENGTH];
settings_t *settings = config_get_ptr();
size_t i;
/* we're just fetching a file the server has, we can update this now */
task_cloud_sync_add_to_updated_manifest(sync_state, key, CS_FILE_HASH(server_file), true);
/* no need to mark need_manifest_uploaded, nothing changed */
if (task_cloud_sync_should_ignore_file(key))
{
/* don't fetch a file we're supposed to ignore, even if the server has it */
RARCH_LOG(CSPFX "ignoring %s\n", key);
return;
}
RARCH_LOG(CSPFX "fetching %s\n", key);
filename[0] = '\0';
for (i = 0; i < dirlist->size; i++)
{
if (!string_starts_with(key, dirlist->elems[i].data))
continue;
fill_pathname_join_special(filename, dirlist->elems[i].userdata, path, sizeof(filename));
break;
}
if (string_is_empty(filename))
{
/* how did this end up here? we don't know where to put it... */
RARCH_WARN(CSPFX "don't know where to put %s!\n", key);
return;
}
if (!settings->bools.cloud_sync_destructive && path_is_valid(filename))
{
size_t idx;
if (file_list_search(sync_state->current_manifest, path, &idx))
task_cloud_sync_backup_file(&sync_state->current_manifest->list[idx]);
}
fill_pathname_basedir(directory, filename, sizeof(directory));
path_mkdir(directory);
if (cloud_sync_read(key, filename, task_cloud_sync_fetch_cb, sync_state))
sync_state->waiting = true;
else
{
RARCH_WARN(CSPFX "wanted to fetch %s but failed\n", key);
sync_state->failures = true;
}
}
static void task_cloud_sync_resolve_conflict(task_cloud_sync_state_t *sync_state)
{
/*
* rather than pop up some UI let's just resolve it ourselves!
* three options:
* 1. rename the server file and replace it
* 2. rename the local file and replace it
* 3. ignore it
* If we ignore it then we need to keep it out of the new local manifest
*/
struct item_file *server_file = &sync_state->server_manifest->list[sync_state->server_idx];
RARCH_WARN(CSPFX "conflicting change of %s\n", CS_FILE_KEY(server_file));
task_cloud_sync_add_to_updated_manifest(sync_state, CS_FILE_KEY(server_file), CS_FILE_HASH(server_file), true);
/* no need to mark need_manifest_uploaded, nothing changed */
sync_state->conflicts = true;
}
static void task_cloud_sync_upload_cb(void *user_data, const char *path, bool success, RFILE *file)
{
task_cloud_sync_state_t *sync_state = (task_cloud_sync_state_t *)user_data;
size_t idx;
if (file)
filestream_close(file);
if (!sync_state)
return;
sync_state->waiting = false;
if (success)
{
/* need to update server manifest as well */
if (file_list_search(sync_state->current_manifest, path, &idx))
{
struct item_file *current_file = &sync_state->current_manifest->list[idx];
task_cloud_sync_add_to_updated_manifest(sync_state, path, CS_FILE_HASH(current_file), true);
task_cloud_sync_add_to_updated_manifest(sync_state, path, CS_FILE_HASH(current_file), false);
sync_state->need_manifest_uploaded = true;
}
RARCH_LOG(CSPFX "uploading %s succeeded\n", path);
}
else
{
/* if the upload fails, try to resurrect the hash from the last sync */
if (file_list_search(sync_state->local_manifest, path, &idx))
{
struct item_file *local_file = &sync_state->local_manifest->list[idx];
task_cloud_sync_add_to_updated_manifest(sync_state, path, CS_FILE_HASH(local_file), false);
}
RARCH_WARN(CSPFX "uploading %s failed\n", path);
sync_state->failures = true;
}
}
static void task_cloud_sync_upload_current_file(task_cloud_sync_state_t *sync_state)
{
struct item_file *item = &sync_state->current_manifest->list[sync_state->current_idx];
const char *path = CS_FILE_KEY(item);
const char *filename = item->path;
RFILE *file;
if (task_cloud_sync_should_ignore_file(path))
{
RARCH_LOG(CSPFX "ignoring %s, not uploading\n", path);
return;
}
file = filestream_open(filename,
RETRO_VFS_FILE_ACCESS_READ, RETRO_VFS_FILE_ACCESS_HINT_NONE);
if (!file)
return;
RARCH_LOG(CSPFX "uploading %s\n", path);
item->userdata = task_cloud_sync_md5_rfile(file);
filestream_seek(file, 0, SEEK_SET);
sync_state->waiting = true;
if (!cloud_sync_update(path, file, task_cloud_sync_upload_cb, sync_state))
{
/* if the upload fails, try to resurrect the hash from the last sync */
size_t idx;
if (file_list_search(sync_state->local_manifest, path, &idx))
{
struct item_file *local_file = &sync_state->local_manifest->list[idx];
task_cloud_sync_add_to_updated_manifest(sync_state, path, CS_FILE_HASH(local_file), false);
}
filestream_close(file);
sync_state->waiting = false;
sync_state->failures = true;
RARCH_WARN(CSPFX "uploading %s failed\n", path);
}
}
static void task_cloud_sync_delete_current_file(task_cloud_sync_state_t *sync_state)
{
struct item_file *item = &sync_state->current_manifest->list[sync_state->current_idx];
settings_t *settings = config_get_ptr();
RARCH_WARN(CSPFX "server has deleted %s, so shall we\n", CS_FILE_KEY(item));
if (settings->bools.cloud_sync_destructive)
filestream_delete(item->path);
else
task_cloud_sync_backup_file(item);
}
static void task_cloud_sync_check_server_current(task_cloud_sync_state_t *sync_state, bool include_local)
{
bool server_changed, current_changed;
struct item_file *server_file = &sync_state->server_manifest->list[sync_state->server_idx];
struct item_file *local_file = NULL;
struct item_file *current_file = &sync_state->current_manifest->list[sync_state->current_idx];
const char *filename = current_file->path;
RFILE *file;
if (task_cloud_sync_should_ignore_file(CS_FILE_KEY(server_file)))
{
RARCH_LOG(CSPFX "ignoring %s (despite possible conflict)\n", CS_FILE_KEY(server_file));
return;
}
file = filestream_open(filename,
RETRO_VFS_FILE_ACCESS_READ, RETRO_VFS_FILE_ACCESS_HINT_NONE);
if (!file)
return;
current_file->userdata = task_cloud_sync_md5_rfile(file);
filestream_close(file);
if (string_is_equal(CS_FILE_HASH(server_file), CS_FILE_HASH(current_file)))
{
task_cloud_sync_add_to_updated_manifest(sync_state, CS_FILE_KEY(current_file), CS_FILE_HASH(current_file), true);
task_cloud_sync_add_to_updated_manifest(sync_state, CS_FILE_KEY(current_file), CS_FILE_HASH(current_file), false);
/* No need to mark need_manifest_uploaded, nothing changed */
return;
}
if (!include_local)
{
task_cloud_sync_resolve_conflict(sync_state);
return;
}
local_file = &sync_state->local_manifest->list[sync_state->local_idx];
server_changed = !string_is_equal(CS_FILE_HASH(local_file), CS_FILE_HASH(server_file));
current_changed = !string_is_equal(CS_FILE_HASH(local_file), CS_FILE_HASH(current_file));
if (server_changed && current_changed)
task_cloud_sync_resolve_conflict(sync_state);
else if (current_changed)
task_cloud_sync_upload_current_file(sync_state);
else if (!CS_FILE_DELETED(server_file))
task_cloud_sync_fetch_server_file(sync_state);
else
task_cloud_sync_delete_current_file(sync_state);
}
static void task_cloud_sync_delete_cb(void *user_data, const char *path, bool success, RFILE *file)
{
task_cloud_sync_state_t *sync_state = (task_cloud_sync_state_t *)user_data;
if (!sync_state)
return;
sync_state->waiting = false;
if (!success)
{
/* if the delete fails, resurrect the hash from the last sync */
size_t idx;
if (file_list_search(sync_state->local_manifest, path, &idx))
{
struct item_file *local_file = &sync_state->local_manifest->list[idx];
task_cloud_sync_add_to_updated_manifest(sync_state, path, CS_FILE_HASH(local_file), false);
}
RARCH_WARN(CSPFX "deleting %s failed\n", path);
sync_state->failures = true;
return;
}
RARCH_LOG(CSPFX "deleting %s succeeded\n", path);
/* need to update server manifest. we don't set the hash as that indicates a
* deleted file. need to update the local manifest to indicate we sync'd that
* it is deleted */
task_cloud_sync_add_to_updated_manifest(sync_state, path, NULL, true);
task_cloud_sync_add_to_updated_manifest(sync_state, path, NULL, false);
sync_state->need_manifest_uploaded = true;
}
static void task_cloud_sync_delete_server_file(task_cloud_sync_state_t *sync_state)
{
struct item_file *server_file = &sync_state->server_manifest->list[sync_state->server_idx];
const char *key = CS_FILE_KEY(server_file);
if (task_cloud_sync_should_ignore_file(key))
{
RARCH_LOG(CSPFX "ignoring %s, instead of removing from server\n", key);
return;
}
RARCH_LOG(CSPFX "deleting %s\n", key);
sync_state->waiting = true;
if (!cloud_sync_delete(key, task_cloud_sync_delete_cb, sync_state))
{
/* if the delete fails, resurrect the hash from the last sync */
size_t idx;
if (file_list_search(sync_state->local_manifest, key, &idx))
{
struct item_file *local_file = &sync_state->local_manifest->list[idx];
task_cloud_sync_add_to_updated_manifest(sync_state, key, CS_FILE_HASH(local_file), false);
}
task_cloud_sync_add_to_updated_manifest(sync_state, key, CS_FILE_HASH(server_file), true);
/* we don't mark need_manifest_uploaded here, nothing has changed */
sync_state->waiting = false;
}
}
static void task_cloud_sync_diff_next(task_cloud_sync_state_t *sync_state)
{
int server_local_key_cmp;
int server_current_key_cmp;
int current_local_key_cmp;
struct item_file *server_file = NULL;
struct item_file *local_file = NULL;
struct item_file *current_file = NULL;
if ( sync_state->server_manifest
&& sync_state->server_idx < sync_state->server_manifest->size)
server_file = &sync_state->server_manifest->list[sync_state->server_idx];
if ( sync_state->local_manifest
&& sync_state->local_idx < sync_state->local_manifest->size)
local_file = &sync_state->local_manifest->list[sync_state->local_idx];
if ( sync_state->current_manifest
&& sync_state->current_idx < sync_state->current_manifest->size)
current_file = &sync_state->current_manifest->list[sync_state->current_idx];
if (!server_file && !local_file && !current_file)
{
RARCH_LOG(CSPFX "finished processing manifests\n");
sync_state->phase = CLOUD_SYNC_PHASE_UPDATE_MANIFESTS;
return;
}
/* Doing a three-way diff of sorted lists of files. grab the first one from
* each, resolve any difference, move on. */
server_local_key_cmp = task_cloud_sync_key_cmp(server_file, local_file);
if (server_local_key_cmp < 0)
{
/* server has a file not in the last sync'd manifest */
server_current_key_cmp = task_cloud_sync_key_cmp(server_file, current_file);
if (server_current_key_cmp < 0)
{
/* the server has a file we don't have */
if (!CS_FILE_DELETED(server_file))
task_cloud_sync_fetch_server_file(sync_state);
else
{
/* it's deleted on the server, remember that and mark the sync of the delete */
task_cloud_sync_add_to_updated_manifest(sync_state, CS_FILE_KEY(server_file), NULL, true);
task_cloud_sync_add_to_updated_manifest(sync_state, CS_FILE_KEY(server_file), NULL, false);
/* we don't mark need_manifest_uploaded here, nothing has changed */
}
sync_state->server_idx++;
}
else if (server_current_key_cmp == 0)
{
/* the server has a file that we also have locally but haven't fetched from the server previously */
task_cloud_sync_check_server_current(sync_state, false);
sync_state->server_idx++;
sync_state->current_idx++;
}
else
{
/* we have a file locally that the server doesn't have */
task_cloud_sync_upload_current_file(sync_state);
sync_state->current_idx++;
}
}
else if (server_local_key_cmp == 0)
{
/* we've seen this file from the server before */
current_local_key_cmp = task_cloud_sync_key_cmp(current_file, local_file);
if (current_local_key_cmp < 0)
{
/* we have a file locally that the server doesn't have */
task_cloud_sync_upload_current_file(sync_state);
sync_state->current_idx++;
}
else if (current_local_key_cmp == 0)
{
/* we're all looking at the same file */
task_cloud_sync_check_server_current(sync_state, true);
sync_state->current_idx++;
sync_state->local_idx++;
sync_state->server_idx++;
}
else
{
/* the file has been deleted locally */
if (!CS_FILE_DELETED(server_file))
task_cloud_sync_delete_server_file(sync_state);
else
{
/* already deleted, oh well */
task_cloud_sync_add_to_updated_manifest(sync_state, CS_FILE_KEY(server_file), NULL, true);
task_cloud_sync_add_to_updated_manifest(sync_state, CS_FILE_KEY(server_file), NULL, false);
/* we don't mark need_manifest_uploaded here, nothing has changed */
}
sync_state->local_idx++;
sync_state->server_idx++;
}
}
else
{
/* the server is missing a file that we've sync'd before? should have at
* least had a deleted record? assume the server state got reset and treat
* as a missing file on the server */
current_local_key_cmp = task_cloud_sync_key_cmp(current_file, local_file);
if (current_local_key_cmp < 0)
{
task_cloud_sync_upload_current_file(sync_state);
sync_state->current_idx++;
}
else if (current_local_key_cmp == 0)
{
task_cloud_sync_upload_current_file(sync_state);
sync_state->current_idx++;
sync_state->local_idx++;
}
else
{
/* this is odd, it exists in the last sync manifest but not on the
* server and not on disk? wtf? */
RARCH_WARN(CSPFX "%s only exists in previous manifest? odd\n", CS_FILE_KEY(local_file));
sync_state->local_idx++;
}
}
}
static void task_cloud_sync_update_manifest_cb(void *user_data, const char *path, bool success, RFILE *file)
{
task_cloud_sync_state_t *sync_state = (task_cloud_sync_state_t *)user_data;
if (file)
filestream_close(file);
if (!sync_state)
return;
RARCH_LOG(CSPFX "uploading updated manifest succeeded\n");
sync_state->waiting = false;
sync_state->phase = CLOUD_SYNC_PHASE_END;
}
static RFILE *task_cloud_sync_write_updated_manifest(file_list_t *manifest, char *path)
{
rjsonwriter_t *writer = NULL;
size_t idx = 0;
RFILE *file = filestream_open(path,
RETRO_VFS_FILE_ACCESS_READ_WRITE, RETRO_VFS_FILE_ACCESS_HINT_NONE);
if (!file)
return NULL;
if (!(writer = rjsonwriter_open_rfile(file)))
{
filestream_close(file);
return NULL;
}
rjsonwriter_raw(writer, "[\n", 2);
for (; idx < manifest->size; idx++)
{
struct item_file *item = &manifest->list[idx];
if (idx)
rjsonwriter_raw(writer, ",\n", 2);
rjsonwriter_add_spaces(writer, 2);
rjsonwriter_raw(writer, "{\n", 2);
rjsonwriter_add_spaces(writer, 4);
rjsonwriter_add_string(writer, "path");
rjsonwriter_raw(writer, ": ", 2);
rjsonwriter_add_string(writer, CS_FILE_KEY(item));
rjsonwriter_raw(writer, ",\n", 2);
rjsonwriter_add_spaces(writer, 4);
rjsonwriter_add_string(writer, "hash");
rjsonwriter_raw(writer, ": ", 2);
rjsonwriter_add_string(writer, CS_FILE_HASH(item));
rjsonwriter_raw(writer, "\n", 1);
rjsonwriter_add_spaces(writer, 2);
rjsonwriter_raw(writer, "}", 1);
}
rjsonwriter_raw(writer, "\n]\n", 3);
rjsonwriter_free(writer);
RARCH_LOG(CSPFX "wrote %s\n", path);
return file;
}
static void task_cloud_sync_update_manifests(task_cloud_sync_state_t *sync_state)
{
char manifest_path[PATH_MAX_LENGTH];
RFILE *file = NULL;
task_cloud_sync_manifest_filename(manifest_path, sizeof(manifest_path), false);
file = task_cloud_sync_write_updated_manifest(sync_state->updated_local_manifest, manifest_path);
if (file)
filestream_close(file);
if (sync_state->need_manifest_uploaded)
{
RARCH_LOG(CSPFX "uploading updated manifest to server\n");
task_cloud_sync_manifest_filename(manifest_path, sizeof(manifest_path), true);
file = task_cloud_sync_write_updated_manifest(sync_state->updated_server_manifest, manifest_path);
filestream_seek(file, 0, SEEK_SET);
sync_state->waiting = true;
if (!cloud_sync_update(MANIFEST_FILENAME_SERVER, file, task_cloud_sync_update_manifest_cb, sync_state))
{
RARCH_LOG(CSPFX "uploading updated manifest failed\n");
filestream_close(file);
sync_state->waiting = false;
sync_state->failures = true;
sync_state->phase = CLOUD_SYNC_PHASE_END;
}
return;
}
else
sync_state->phase = CLOUD_SYNC_PHASE_END;
}
static void task_cloud_sync_end_handler(void *user_data, const char *path, bool success, RFILE *file)
{
retro_task_t *task = (retro_task_t *)user_data;
task_cloud_sync_state_t *sync_state = NULL;
if (!task)
return;
if ((sync_state = (task_cloud_sync_state_t *)task->state))
{
char title[512];
size_t len = strlcpy(title, "Cloud Sync finished", sizeof(title));
if (sync_state->failures || sync_state->conflicts)
len += strlcpy(title + len, " with ", sizeof(title) - len);
if (sync_state->failures)
len += strlcpy(title + len, "failures", sizeof(title) - len);
if (sync_state->failures && sync_state->conflicts)
len += strlcpy(title + len, " and ", sizeof(title) - len);
if (sync_state->conflicts)
strlcpy(title + len, "conflicts", sizeof(title) - len);
task_set_title(task, strdup(title));
}
RARCH_LOG(CSPFX "all done!\n");
task_set_finished(task, true);
}
static void task_cloud_sync_task_handler(retro_task_t *task)
{
task_cloud_sync_state_t *sync_state = NULL;
if (!task)
goto task_finished;
if (!(sync_state = (task_cloud_sync_state_t *)task->state))
goto task_finished;
if (sync_state->waiting)
{
task->when = cpu_features_get_time_usec() + 500 * 1000; /* 500ms */
return;
}
switch (sync_state->phase)
{
case CLOUD_SYNC_PHASE_BEGIN:
sync_state->waiting = true;
if (!cloud_sync_begin(task_cloud_sync_begin_handler, task))
{
RARCH_WARN(CSPFX "could not begin\n");
task_set_title(task, strdup("Cloud Sync failed"));
goto task_finished;
}
break;
case CLOUD_SYNC_PHASE_FETCH_SERVER_MANIFEST:
task_cloud_sync_fetch_server_manifest(sync_state);
break;
case CLOUD_SYNC_PHASE_READ_LOCAL_MANIFEST:
task_cloud_sync_read_local_manifest(sync_state);
break;
case CLOUD_SYNC_PHASE_BUILD_CURRENT_MANIFEST:
task_cloud_sync_build_current_manifest(sync_state);
break;
case CLOUD_SYNC_PHASE_DIFF:
task_cloud_sync_update_progress(task);
task_cloud_sync_diff_next(sync_state);
break;
case CLOUD_SYNC_PHASE_UPDATE_MANIFESTS:
task_cloud_sync_update_manifests(sync_state);
break;
case CLOUD_SYNC_PHASE_END:
sync_state->waiting = true;
if (!cloud_sync_end(task_cloud_sync_end_handler, task))
{
RARCH_WARN(CSPFX "could not end?!\n");
goto task_finished;
}
break;
}
return;
task_finished:
if (task)
task_set_finished(task, true);
}
static void task_cloud_sync_cb(retro_task_t *task, void *task_data,
void *user_data, const char *error)
{
task_cloud_sync_state_t *sync_state = (task_cloud_sync_state_t *)task_data;
if (!sync_state)
return;
if (sync_state->server_manifest)
file_list_free(sync_state->server_manifest);
if (sync_state->local_manifest)
file_list_free(sync_state->local_manifest);
if (sync_state->current_manifest)
file_list_free(sync_state->current_manifest);
if (sync_state->updated_server_manifest)
file_list_free(sync_state->updated_server_manifest);
if (sync_state->updated_local_manifest)
file_list_free(sync_state->updated_local_manifest);
free(sync_state);
}
static bool task_cloud_sync_task_finder(retro_task_t *task, void *user_data)
{
if (!task)
return false;
/* there can be only one */
return task->handler == task_cloud_sync_task_handler;
}
void task_push_cloud_sync(void)
{
settings_t *settings = config_get_ptr();
task_finder_data_t find_data;
task_cloud_sync_state_t *sync_state = NULL;
retro_task_t *task = NULL;
char task_title[128];
if (!settings->bools.cloud_sync_enable)
return;
find_data.func = task_cloud_sync_task_finder;
if (task_queue_find(&find_data))
{
RARCH_LOG(CSPFX "already in progress\n");
return;
}
sync_state = (task_cloud_sync_state_t *)calloc(1, sizeof(task_cloud_sync_state_t));
if (!sync_state)
return;
if (!(task = task_init()))
{
free(sync_state);
return;
}
sync_state->phase = CLOUD_SYNC_PHASE_BEGIN;
strlcpy(task_title, "Cloud Sync in progress", sizeof(task_title));
task->state = sync_state;
task->title = strdup(task_title);
task->handler = task_cloud_sync_task_handler;
task->callback = task_cloud_sync_cb;
task_queue_push(task);
}
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