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API: save to temp file first and then rename it

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SChernykh 2022-08-24 17:28:53 +02:00
parent 3ea5b575b7
commit 4599d81a59
2 changed files with 34 additions and 20 deletions
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48
src/p2pool_api.cpp
View file

@ -135,10 +135,8 @@ void p2pool_api::dump_to_file()
}
for (auto& it : data) {
DumpFileWork* work = new DumpFileWork{ {}, {}, {}, it.first, std::move(it.second) };
work->open_req.data = work;
work->write_req.data = work;
work->close_req.data = work;
DumpFileWork* work = new DumpFileWork{ {}, 0, it.first, std::move(it.second) };
work->req.data = work;
const int flags = O_WRONLY | O_CREAT | O_TRUNC
#ifdef O_BINARY
@ -146,7 +144,8 @@ void p2pool_api::dump_to_file()
#endif
;
const int result = uv_fs_open(uv_default_loop_checked(), &work->open_req, it.first.c_str(), flags, 0644, on_fs_open);
const std::string tmp_name = it.first + ".tmp";
const int result = uv_fs_open(uv_default_loop_checked(), &work->req, tmp_name.c_str(), flags, 0644, on_fs_open);
if (result < 0) {
LOGWARN(4, "failed to open " << it.first << ", error " << uv_err_name(result));
delete work;
@ -157,11 +156,11 @@ void p2pool_api::dump_to_file()
void p2pool_api::on_fs_open(uv_fs_t* req)
{
DumpFileWork* work = reinterpret_cast<DumpFileWork*>(req->data);
const int fd = static_cast<int>(req->result);
if (fd < 0) {
LOGWARN(4, "failed to open " << work->name << ", error " << uv_err_name(fd));
work->fd = static_cast<int>(req->result);
uv_fs_req_cleanup(req);
if (work->fd < 0) {
LOGWARN(4, "failed to open " << work->name << ", error " << uv_err_name(work->fd));
delete work;
return;
}
@ -170,15 +169,12 @@ void p2pool_api::on_fs_open(uv_fs_t* req)
buf[0].base = work->buf.data();
buf[0].len = static_cast<uint32_t>(work->buf.size());
const int result = uv_fs_write(uv_default_loop_checked(), &work->write_req, static_cast<uv_file>(fd), buf, 1, 0, on_fs_write);
const int result = uv_fs_write(uv_default_loop_checked(), &work->req, static_cast<uv_file>(work->fd), buf, 1, 0, on_fs_write);
if (result < 0) {
LOGWARN(4, "failed to write to " << work->name << ", error " << uv_err_name(result));
uv_fs_req_cleanup(req);
delete work;
return;
}
uv_fs_req_cleanup(req);
}
void p2pool_api::on_fs_write(uv_fs_t* req)
@ -189,15 +185,14 @@ void p2pool_api::on_fs_write(uv_fs_t* req)
LOGWARN(4, "failed to write to " << work->name << ", error " << uv_err_name(static_cast<int>(req->result)));
}
const int result = uv_fs_close(uv_default_loop_checked(), &work->close_req, static_cast<uv_file>(work->open_req.result), on_fs_close);
uv_fs_req_cleanup(req);
const int result = uv_fs_close(uv_default_loop_checked(), &work->req, static_cast<uv_file>(work->fd), on_fs_close);
if (result < 0) {
LOGWARN(4, "failed to close " << work->name << ", error " << uv_err_name(result));
uv_fs_req_cleanup(req);
delete work;
return;
}
uv_fs_req_cleanup(req);
}
void p2pool_api::on_fs_close(uv_fs_t* req)
@ -208,6 +203,25 @@ void p2pool_api::on_fs_close(uv_fs_t* req)
LOGWARN(4, "failed to close " << work->name << ", error " << uv_err_name(static_cast<int>(req->result)));
}
uv_fs_req_cleanup(req);
const std::string tmp_name = work->name + ".tmp";
const int result = uv_fs_rename(uv_default_loop_checked(), &work->req, tmp_name.c_str(), work->name.c_str(), on_fs_rename);
if (result < 0) {
LOGWARN(4, "failed to rename " << work->name << ", error " << uv_err_name(result));
delete work;
return;
}
}
void p2pool_api::on_fs_rename(uv_fs_t* req)
{
DumpFileWork* work = reinterpret_cast<DumpFileWork*>(req->data);
if (req->result < 0) {
LOGWARN(4, "failed to rename " << work->name << ", error " << uv_err_name(static_cast<int>(req->result)));
}
uv_fs_req_cleanup(req);
delete work;
}

6
src/p2pool_api.h
View file

@ -46,9 +46,8 @@ private:
static void on_dump_to_file(uv_async_t* async) { reinterpret_cast<p2pool_api*>(async->data)->dump_to_file(); }
struct DumpFileWork {
uv_fs_t open_req;
uv_fs_t write_req;
uv_fs_t close_req;
uv_fs_t req;
int fd;
std::string name;
std::vector<char> buf;
@ -77,6 +76,7 @@ private:
static void on_fs_open(uv_fs_t* req);
static void on_fs_write(uv_fs_t* req);
static void on_fs_close(uv_fs_t* req);
static void on_fs_rename(uv_fs_t* req);
std::string m_apiPath;
std::string m_networkPath;