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params: code cleanup (#22744)

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* cleanup params

* apply review

* continue

* use c_str

* cleanup filelock

* don't check return code of close()

* remove call_once

* cleanup params_pyx

* cleanup comment
pull/22769/head
Dean Lee 4 years ago committed by GitHub
parent ea9b93008e
commit 2773ff5ace
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 54 additions and 150 deletions
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  1. 30
      common/params_pyx.pyx
  2. 114
      selfdrive/common/params.cc
  3. 57
      selfdrive/common/params.h
  4. 3
      selfdrive/ui/qt/offroad/settings.cc

30
common/params_pyx.pyx
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@ -14,7 +14,6 @@ cdef extern from "selfdrive/common/params.h":
ALL
cdef cppclass c_Params "Params":
c_Params() nogil
c_Params(string) nogil
string get(string, bool) nogil
bool getBool(string) nogil
@ -34,36 +33,25 @@ class UnknownKeyName(Exception):
cdef class Params:
cdef c_Params* p
def __cinit__(self, d=None):
cdef string path
if d is None:
with nogil:
self.p = new c_Params()
else:
path = <string>d.encode()
with nogil:
self.p = new c_Params(path)
def __cinit__(self, d=""):
cdef string path = <string>d.encode()
with nogil:
self.p = new c_Params(path)
def __dealloc__(self):
del self.p
def clear_all(self, tx_type=None):
if tx_type is None:
tx_type = ParamKeyType.ALL
def clear_all(self, tx_type=ParamKeyType.ALL):
self.p.clearAll(tx_type)
def check_key(self, key):
key = ensure_bytes(key)
if not self.p.checkKey(key):
raise UnknownKeyName(key)
return key
def get(self, key, bool block=False, encoding=None):
cdef string k = self.check_key(key)
cdef string val
with nogil:
val = self.p.get(k, block)
@ -76,10 +64,7 @@ cdef class Params:
else:
return None
if encoding is not None:
return val.decode(encoding)
else:
return val
return val if encoding is None else val.decode(encoding)
def get_bool(self, key):
cdef string k = self.check_key(key)
@ -110,8 +95,7 @@ cdef class Params:
with nogil:
self.p.remove(k)
def put_nonblocking(key, val, d=None):
def put_nonblocking(key, val, d=""):
def f(key, val):
params = Params(d)
cdef string k = ensure_bytes(key)

114
selfdrive/common/params.cc
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@ -1,19 +1,9 @@
#include "selfdrive/common/params.h"
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif // _GNU_SOURCE
#include <dirent.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <unistd.h>
#include <csignal>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <mutex>
#include <unordered_map>
#include "selfdrive/common/swaglog.h"
@ -27,21 +17,16 @@ void params_sig_handler(int signal) {
params_do_exit = 1;
}
int fsync_dir(const char* path) {
int fd = HANDLE_EINTR(open(path, O_RDONLY, 0755));
if (fd < 0) {
return -1;
}
int result = fsync(fd);
int result_close = close(fd);
if (result_close < 0) {
result = result_close;
int fsync_dir(const std::string &path) {
int result = -1;
int fd = HANDLE_EINTR(open(path.c_str(), O_RDONLY, 0755));
if (fd >= 0) {
result = fsync(fd);
close(fd);
}
return result;
}
bool create_params_path(const std::string &param_path, const std::string &key_path) {
// Make sure params path exists
if (!util::file_exists(param_path) && !util::create_directories(param_path, 0775)) {
@ -51,9 +36,8 @@ bool create_params_path(const std::string &param_path, const std::string &key_pa
// See if the symlink exists, otherwise create it
if (!util::file_exists(key_path)) {
// 1) Create temp folder
// 2) Set permissions
// 3) Symlink it to temp link
// 4) Move symlink to <params>/d
// 2) Symlink it to temp link
// 3) Move symlink to <params>/d
std::string tmp_path = param_path + "/.tmp_XXXXXX";
// this should be OK since mkdtemp just replaces characters in place
@ -76,32 +60,26 @@ bool create_params_path(const std::string &param_path, const std::string &key_pa
return true;
}
void ensure_params_path(const std::string &params_path) {
std::string ensure_params_path(const std::string &path = {}) {
std::string params_path = path.empty() ? Path::params() : path;
if (!create_params_path(params_path, params_path + "/d")) {
throw std::runtime_error(util::string_format("Failed to ensure params path, errno=%d", errno));
}
return params_path;
}
class FileLock {
public:
FileLock(const std::string& file_name, int op) : fn_(file_name), op_(op) {}
void lock() {
fd_ = HANDLE_EINTR(open(fn_.c_str(), O_CREAT, 0775));
if (fd_ < 0) {
LOGE("Failed to open lock file %s, errno=%d", fn_.c_str(), errno);
return;
}
if (HANDLE_EINTR(flock(fd_, op_)) < 0) {
LOGE("Failed to lock file %s, errno=%d", fn_.c_str(), errno);
public:
FileLock(const std::string &fn) {
fd_ = HANDLE_EINTR(open(fn.c_str(), O_CREAT, 0775));
if (fd_ < 0 || HANDLE_EINTR(flock(fd_, LOCK_EX)) < 0) {
LOGE("Failed to lock file %s, errno=%d", fn.c_str(), errno);
}
}
void unlock() { close(fd_); }
~FileLock() { close(fd_); }
private:
int fd_ = -1, op_;
std::string fn_;
int fd_ = -1;
};
std::unordered_map<std::string, uint32_t> keys = {
@ -192,13 +170,9 @@ std::unordered_map<std::string, uint32_t> keys = {
} // namespace
Params::Params() : params_path(Path::params()) {
static std::once_flag once_flag;
std::call_once(once_flag, ensure_params_path, params_path);
}
Params::Params(const std::string &path) : params_path(path) {
ensure_params_path(params_path);
Params::Params(const std::string &path) {
static std::string default_param_path = ensure_params_path();
params_path = path.empty() ? default_param_path : ensure_params_path(path);
}
bool Params::checkKey(const std::string &key) {
@ -232,16 +206,13 @@ int Params::put(const char* key, const char* value, size_t value_size) {
// fsync to force persist the changes.
if ((result = fsync(tmp_fd)) < 0) break;
FileLock file_lock(params_path + "/.lock", LOCK_EX);
std::lock_guard<FileLock> lk(file_lock);
FileLock file_lock(params_path + "/.lock");
// Move temp into place.
std::string path = params_path + "/d/" + std::string(key);
if ((result = rename(tmp_path.c_str(), path.c_str())) < 0) break;
if ((result = rename(tmp_path.c_str(), getParamPath(key).c_str())) < 0) break;
// fsync parent directory
path = params_path + "/d";
result = fsync_dir(path.c_str());
result = fsync_dir(getParamPath());
} while (false);
close(tmp_fd);
@ -249,24 +220,18 @@ int Params::put(const char* key, const char* value, size_t value_size) {
return result;
}
int Params::remove(const char *key) {
FileLock file_lock(params_path + "/.lock", LOCK_EX);
std::lock_guard<FileLock> lk(file_lock);
// Delete value.
std::string path = params_path + "/d/" + key;
int result = unlink(path.c_str());
int Params::remove(const std::string &key) {
FileLock file_lock(params_path + "/.lock");
int result = unlink(getParamPath(key).c_str());
if (result != 0) {
return result;
}
// fsync parent directory
path = params_path + "/d";
return fsync_dir(path.c_str());
return fsync_dir(getParamPath());
}
std::string Params::get(const char *key, bool block) {
std::string path = params_path + "/d/" + key;
std::string Params::get(const std::string &key, bool block) {
if (!block) {
return util::read_file(path);
return util::read_file(getParamPath(key));
} else {
// blocking read until successful
params_do_exit = 0;
@ -275,7 +240,7 @@ std::string Params::get(const char *key, bool block) {
std::string value;
while (!params_do_exit) {
if (value = util::read_file(path); !value.empty()) {
if (value = util::read_file(getParamPath(key)); !value.empty()) {
break;
}
util::sleep_for(100); // 0.1 s
@ -288,26 +253,19 @@ std::string Params::get(const char *key, bool block) {
}
std::map<std::string, std::string> Params::readAll() {
FileLock file_lock(params_path + "/.lock", LOCK_SH);
std::lock_guard<FileLock> lk(file_lock);
std::string key_path = params_path + "/d";
return util::read_files_in_dir(key_path);
FileLock file_lock(params_path + "/.lock");
return util::read_files_in_dir(getParamPath());
}
void Params::clearAll(ParamKeyType key_type) {
FileLock file_lock(params_path + "/.lock", LOCK_EX);
std::lock_guard<FileLock> lk(file_lock);
FileLock file_lock(params_path + "/.lock");
std::string path;
for (auto &[key, type] : keys) {
if (type & key_type) {
path = params_path + "/d/" + key;
unlink(path.c_str());
unlink(getParamPath(key).c_str());
}
}
// fsync parent directory
path = params_path + "/d";
fsync_dir(path.c_str());
fsync_dir(getParamPath());
}

57
selfdrive/common/params.h
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@ -1,9 +1,7 @@
#pragma once
#include <map>
#include <sstream>
#include <string>
#include <optional>
enum ParamKeyType {
PERSISTENT = 0x02,
@ -17,68 +15,33 @@ enum ParamKeyType {
class Params {
public:
Params();
Params(const std::string &path);
Params(const std::string &path = {});
bool checkKey(const std::string &key);
ParamKeyType getKeyType(const std::string &key);
inline std::string getParamPath(const std::string &key = {}) {
return key.empty() ? params_path + "/d" : params_path + "/d/" + key;
}
// Delete a value
int remove(const char *key);
inline int remove(const std::string &key) {
return remove (key.c_str());
}
int remove(const std::string &key);
void clearAll(ParamKeyType type);
// read all values
std::map<std::string, std::string> readAll();
// helpers for reading values
std::string get(const char *key, bool block = false);
inline std::string get(const std::string &key, bool block = false) {
return get(key.c_str(), block);
}
inline std::string getParamsPath() {
return params_path;
}
inline std::string getParamPath(std::string key) {
return params_path + "/d/" + key;
}
template <class T>
std::optional<T> get(const char *key, bool block = false) {
std::istringstream iss(get(key, block));
T value{};
iss >> value;
return iss.fail() ? std::nullopt : std::optional(value);
}
std::string get(const std::string &key, bool block = false);
inline bool getBool(const std::string &key) {
return getBool(key.c_str());
}
inline bool getBool(const char *key) {
return get(key) == "1";
}
std::map<std::string, std::string> readAll();
// helpers for writing values
int put(const char* key, const char* val, size_t value_size);
int put(const char *key, const char *val, size_t value_size);
inline int put(const std::string &key, const std::string &val) {
return put(key.c_str(), val.data(), val.size());
}
inline int putBool(const char *key, bool val) {
return put(key, val ? "1" : "0", 1);
}
inline int putBool(const std::string &key, bool val) {
return putBool(key.c_str(), val);
return put(key.c_str(), val ? "1" : "0", 1);
}
private:
const std::string params_path;
std::string params_path;
};

3
selfdrive/ui/qt/offroad/settings.cc
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@ -227,8 +227,7 @@ SoftwarePanel::SoftwarePanel(QWidget* parent) : ListWidget(parent) {
fs_watch = new QFileSystemWatcher(this);
QObject::connect(fs_watch, &QFileSystemWatcher::fileChanged, [=](const QString path) {
int update_failed_count = params.get<int>("UpdateFailedCount").value_or(0);
if (path.contains("UpdateFailedCount") && update_failed_count > 0) {
if (path.contains("UpdateFailedCount") && std::atoi(params.get("UpdateFailedCount").c_str()) > 0) {
lastUpdateLbl->setText("failed to fetch update");
updateBtn->setText("CHECK");
updateBtn->setEnabled(true);

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