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abaddon/src/filecache.cpp at master · uowuo/abaddon · GitHub
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#
include
"
filecache.hpp
"
#
include
<
utility
>
#
include
"
abaddon.hpp
"
#
include
"
MurmurHash3.h
"
std::string
GetCachedName
(
const
std::string &str) {
uint32_t
out;
MurmurHash3_x86_32
(str.
c_str
(),
static_cast
<
int
>(str.
size
()),
0
, &out);
return
std::to_string
(out);
}
Cache::Cache
() {
gchar *rand =
g_uuid_string_random
();
std::string randstr = rand;
g_free
(rand);
m_tmp_path =
std::filesystem::temp_directory_path
() / (
"
abaddon-cache-
"
+ randstr);
std::filesystem::create_directories
(m_tmp_path);
m_worker.
set_file_path
(m_tmp_path);
}
Cache::~Cache
() {
m_worker.
stop
();
for
(
auto
&future : m_futures) {
if
(future.
valid
()) {
try
{
//
dont care about stored exceptions
future.
get
();
}
catch
(...) {}
}
}
std::error_code err;
if
(!
std::filesystem::remove_all
(m_tmp_path, err))
fprintf
(stderr,
"
error removing tmp dir
\n
"
);
}
void
Cache::ClearCache
() {
for
(
const
auto
&path :
std::filesystem::directory_iterator
(m_tmp_path))
std::filesystem::remove_all
(path);
}
std::filesystem::path
Cache::GetCachePath
()
const
{
return
m_tmp_path;
}
void
Cache::RespondFromPath
(
const
std::filesystem::path &path,
const
callback_type &cb) {
cb
(path.
string
());
}
void
Cache::GetFileFromURL
(
const
std::string &url,
const
callback_type &cb) {
auto
cache_path = m_tmp_path /
GetCachedName
(url);
if
(
std::filesystem::exists
(cache_path)) {
m_mutex.
lock
();
m_futures.
push_back
(
std::async
(std::launch::async, [cache_path, cb]() {
RespondFromPath
(cache_path, cb); }));
m_mutex.
unlock
();
return
;
}
if
(m_callbacks.
find
(url) != m_callbacks.
end
()) {
m_callbacks[url].
push_back
(cb);
}
else
{
m_callbacks[url].
push_back
(cb);
m_worker.
add_image
(url, [
this
, url](
const
std::string &path) {
OnFetchComplete
(url);
});
}
}
std::string
Cache::GetPathIfCached
(
const
std::string &url) {
auto
cache_path = m_tmp_path /
GetCachedName
(url);
if
(
std::filesystem::exists
(cache_path)) {
return
cache_path.
string
();
}
return
"
"
;
}
//
this just seems really yucky
void
Cache::CleanupFutures
() {
std::lock_guard<std::mutex>
l
(m_mutex);
for
(
auto
it = m_futures.
begin
(); it != m_futures.
end
();) {
if
(it->
valid
() && it->
wait_for
(
std::chrono::seconds
(
0
)) == std::future_status::ready)
it = m_futures.
erase
(it);
else
it++;
}
}
void
Cache::OnResponse
(
const
std::string &url) {
CleanupFutures
();
//
see above comment
auto
path = m_tmp_path /
GetCachedName
(url);
m_mutex.
lock
();
const
auto
key =
static_cast
<std::string>(url);
auto
callbacks =
std::move
(m_callbacks[key]);
m_callbacks.
erase
(key);
m_mutex.
unlock
();
for
(
const
auto
&cb : callbacks)
cb
(path.
string
());
}
void
Cache::OnFetchComplete
(
const
std::string &url) {
m_mutex.
lock
();
m_futures.
push_back
(
std::async
(std::launch::async, [
this
, url] {
OnResponse
(url); }));
m_mutex.
unlock
();
}
FileCacheWorkerThread::FileCacheWorkerThread
() {
m_multi_handle =
curl_multi_init
();
m_thread =
std::thread
([
this
] {
loop
(); });
}
FileCacheWorkerThread::~FileCacheWorkerThread
() {
if
(!m_stop)
stop
();
for
(
const
auto
handle : m_handles)
curl_easy_cleanup
(handle);
curl_multi_cleanup
(m_multi_handle);
}
void
FileCacheWorkerThread::set_file_path
(
const
std::filesystem::path &path) {
m_data_path = path;
}
void
FileCacheWorkerThread::add_image
(
const
std::string &string, callback_type callback) {
m_queue_mutex.
lock
();
m_queue.
push
({ string,
std::move
(callback) });
m_cv.
notify_one
();
m_queue_mutex.
unlock
();
}
void
FileCacheWorkerThread::stop
() {
m_stop =
true
;
if
(m_thread.
joinable
()) {
m_cv.
notify_all
();
m_thread.
join
();
}
}
void
FileCacheWorkerThread::loop
() {
timeval timeout {};
timeout.
tv_sec
=
1
;
timeout.
tv_usec
=
0
;
while
(!m_stop) {
if
(m_handles.
empty
()) {
std::unique_lock<std::mutex>
lock
(m_queue_mutex);
if
(m_queue.
empty
())
m_cv.
wait
(lock);
}
static
const
auto
concurrency =
static_cast
<
size_t
>(
Abaddon::Get
().
GetSettings
().
CacheHTTPConcurrency
);
if
(m_handles.
size
() < concurrency) {
std::optional<QueueEntry> entry;
m_queue_mutex.
lock
();
if
(!m_queue.
empty
()) {
entry =
std::move
(m_queue.
front
());
m_queue.
pop
();
}
m_queue_mutex.
unlock
();
if
(entry.
has_value
()) {
if
(m_callbacks.
find
(entry->
URL
) != m_callbacks.
end
()) {
printf
(
"
url is being requested twice :(
\n
"
);
continue
;
}
//
add the ! and rename after so the image loader thing doesnt pick it up if its not done yet
auto
path = m_data_path / (
GetCachedName
(entry->
URL
) +
"
!
"
);
FILE
*fp =
std::fopen
(path.
string
().
c_str
(),
"
wb
"
);
if
(fp ==
nullptr
) {
printf
(
"
couldn't open fp
\n
"
);
continue
;
}
CURL
*handle =
curl_easy_init
();
m_handles.
insert
(handle);
curl_easy_setopt
(handle,
CURLOPT_URL
, entry->
URL
.
c_str
());
curl_easy_setopt
(handle,
CURLOPT_FOLLOWLOCATION
,
1L
);
curl_easy_setopt
(handle,
CURLOPT_WRITEDATA
, fp);
m_handle_urls[handle] = entry->
URL
;
m_curl_file_handles[handle] = fp;
m_callbacks[entry->
URL
] = entry->
Callback
;
m_paths[entry->
URL
] =
std::move
(path);
curl_multi_add_handle
(m_multi_handle, handle);
}
}
fd_set fdread;
fd_set fdwrite;
fd_set fdexcep;
int
maxfd = -
1
;
FD_ZERO
(&fdread);
FD_ZERO
(&fdwrite);
FD_ZERO
(&fdexcep);
curl_multi_fdset
(m_multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
if
(maxfd == -
1
) {
std::this_thread::sleep_for
(
std::chrono::milliseconds
(
100
));
}
else
{
select
(maxfd +
1
, &fdread, &fdwrite, &fdexcep, &timeout);
}
curl_multi_perform
(m_multi_handle, &m_running_handles);
int
num_msgs;
while
(
auto
msg =
curl_multi_info_read
(m_multi_handle, &num_msgs)) {
if
(msg->
msg
==
CURLMSG_DONE
) {
auto
url = m_handle_urls.
at
(msg->
easy_handle
);
auto
fp = m_curl_file_handles.
find
(msg->
easy_handle
);
std::fclose
(fp->
second
);
m_handles.
erase
(msg->
easy_handle
);
m_handle_urls.
erase
(msg->
easy_handle
);
curl_multi_remove_handle
(m_multi_handle, msg->
easy_handle
);
curl_easy_cleanup
(msg->
easy_handle
);
auto
path = m_paths.
at
(url).
string
();
auto
cb = m_callbacks.
at
(url);
m_callbacks.
erase
(url);
m_paths.
erase
(url);
m_curl_file_handles.
erase
(fp);
//
chop off the !
auto
old = path;
path.
pop_back
();
std::filesystem::rename
(old, path);
cb
(path);
}
}
}
}
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