From c029d90d1975e124d237605f1edb2be16bd05b5d Mon Sep 17 00:00:00 2001
From: Joel Klinghed <the_jk@yahoo.com>
Date: Tue, 28 Feb 2017 21:50:44 +0100
Subject: Initial commit

---
 src/logger.cc | 130 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 src/logger.cc

(limited to 'src/logger.cc')

diff --git a/src/logger.cc b/src/logger.cc
new file mode 100644
index 0000000..29dcb38
--- /dev/null
+++ b/src/logger.cc
@@ -0,0 +1,130 @@
+// -*- mode: c++; c-basic-offset: 2; -*-
+
+#include "common.hh"
+
+#ifndef _BSD_SOURCE
+#define _BSD_SOURCE
+#endif
+#ifndef _DEFAULT_SOURCE
+#define _DEFAULT_SOURCE
+#endif
+
+#include <cstdarg>
+#include <cstdio>
+#include <iostream>
+#include <memory>
+#include <syslog.h>
+
+#include "logger.hh"
+
+namespace {
+
+class LoggerStdErr : public Logger {
+public:
+  void out(Level UNUSED(lvl), char const* format, ...) override {
+    char* tmp;
+    va_list args;
+    va_start(args, format);
+    auto ret = vasprintf(&tmp, format, args);
+    va_end(args);
+    if (ret == -1) return;
+    std::cerr << tmp << std::endl;
+    free(tmp);
+  }
+};
+
+class LoggerSyslog : public Logger {
+public:
+  LoggerSyslog(std::string const& name) {
+    openlog(name.c_str(), LOG_PID, LOG_DAEMON);
+  }
+
+  ~LoggerSyslog() override {
+    closelog();
+  }
+
+  void out(Level lvl, char const* format, ...) override {
+    va_list args;
+    va_start(args, format);
+    vsyslog(lvl2prio(lvl), format, args);
+    va_end(args);
+  }
+
+private:
+  static int lvl2prio(Level lvl) {
+    switch (lvl) {
+    case ERR:
+      return LOG_ERR;
+    case WARN:
+      return LOG_WARNING;
+    case INFO:
+      return LOG_INFO;
+    }
+    assert(false);
+    return LOG_INFO;
+  }
+};
+
+class LoggerFile : public Logger {
+public:
+  LoggerFile()
+    : fh_(nullptr) {
+  }
+
+  bool open(std::string const& path) {
+    if (fh_) fclose(fh_);
+    fh_ = fopen(path.c_str(), "a");
+    return fh_ != NULL;
+  }
+
+  ~LoggerFile() override {
+    if (fh_) fclose(fh_);
+  }
+
+  void out(Level lvl, char const* format, ...) override {
+    fputs(lvl2str(lvl), fh_);
+    fwrite(": ", 1, 2, fh_);
+    va_list args;
+    va_start(args, format);
+    vfprintf(fh_, format, args);
+    va_end(args);
+    fputc('\n', fh_);
+  }
+
+private:
+  static char const* lvl2str(Level lvl) {
+    switch (lvl) {
+    case ERR:
+      return "Error";
+    case WARN:
+      return "Warning";
+    case INFO:
+      return "Info";
+    }
+    assert(false);
+    return "Info";
+  }
+
+  FILE* fh_;
+};
+
+}  // namespace
+
+// static
+Logger* Logger::create_stderr() {
+  return new LoggerStdErr();
+}
+
+// static
+Logger* Logger::create_syslog(std::string const& name) {
+  return new LoggerSyslog(name);
+}
+
+// static
+Logger* Logger::create_file(std::string const& path) {
+  std::unique_ptr<LoggerFile> ret(new LoggerFile());
+  if (ret->open(path)) {
+    return ret.release();
+  }
+  return nullptr;
+}
-- 
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