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Improved logging abstraction

Browse source 
This also gets rid of --log-type, since the nested log type isn't
useful in a multi-threaded situation, and nobody cares about the
"pretty" log type.
This commit is contained in:
Eelco Dolstra 2016-04-25 15:26:07 +02:00
parent c879a20850
commit 41633f9f73
29 changed files with 394 additions and 456 deletions
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113
src/libutil/util.cc
View file

@ -356,8 +356,7 @@ void deletePath(const Path & path)
void deletePath(const Path & path, unsigned long long & bytesFreed)
{
startNest(nest, lvlDebug,
format("recursively deleting path ‘%1%’") % path);
Activity act(*logger, lvlDebug, format("recursively deleting path ‘%1%’") % path);
bytesFreed = 0;
_deletePath(path, bytesFreed);
}
@ -456,113 +455,6 @@ void replaceSymlink(const Path & target, const Path & link)
}
LogType logType = ltPretty;
Verbosity verbosity = lvlInfo;
static int nestingLevel = 0;
Nest::Nest()
{
nest = false;
}
Nest::~Nest()
{
close();
}
static string escVerbosity(Verbosity level)
{
return std::to_string((int) level);
}
void Nest::open(Verbosity level, const FormatOrString & fs)
{
if (level <= verbosity) {
if (logType == ltEscapes)
std::cerr << "\033[" << escVerbosity(level) << "p"
<< fs.s << "\n";
else
printMsg_(level, fs);
nest = true;
nestingLevel++;
}
}
void Nest::close()
{
if (nest) {
nestingLevel--;
if (logType == ltEscapes)
std::cerr << "\033[q";
nest = false;
}
}
void printMsg_(Verbosity level, const FormatOrString & fs)
{
checkInterrupt();
if (level > verbosity) return;
string prefix;
if (logType == ltPretty)
for (int i = 0; i < nestingLevel; i++)
prefix += "| ";
else if (logType == ltEscapes && level != lvlInfo)
prefix = "\033[" + escVerbosity(level) + "s";
else if (logType == ltSystemd) {
char c;
switch (level) {
case lvlError: c = '3'; break;
case lvlInfo: c = '5'; break;
case lvlTalkative: case lvlChatty: c = '6'; break;
default: c = '7';
}
prefix = string("<") + c + ">";
}
string s = (format("%1%%2%\n") % prefix % fs.s).str();
if (!isatty(STDERR_FILENO)) s = filterANSIEscapes(s);
writeToStderr(s);
}
void warnOnce(bool & haveWarned, const FormatOrString & fs)
{
if (!haveWarned) {
printMsg(lvlError, format("warning: %1%") % fs.s);
haveWarned = true;
}
}
void writeToStderr(const string & s)
{
try {
if (_writeToStderr)
_writeToStderr((const unsigned char *) s.data(), s.size());
else
writeFull(STDERR_FILENO, s);
} catch (SysError & e) {
/* Ignore failing writes to stderr if we're in an exception
handler, otherwise throw an exception. We need to ignore
write errors in exception handlers to ensure that cleanup
code runs to completion if the other side of stderr has
been closed unexpectedly. */
if (!std::uncaught_exception()) throw;
}
}
std::function<void(const unsigned char * buf, size_t count)> _writeToStderr;
void readFull(int fd, unsigned char * buf, size_t count)
{
while (count) {
@ -953,7 +845,8 @@ static pid_t doFork(bool allowVfork, std::function<void()> fun)
pid_t startProcess(std::function<void()> fun, const ProcessOptions & options)
{
auto wrapper = [&]() {
if (!options.allowVfork) _writeToStderr = 0;
if (!options.allowVfork)
logger = makeDefaultLogger();
try {
#if __linux__
if (options.dieWithParent && prctl(PR_SET_PDEATHSIG, SIGKILL) == -1)