1 files changed, 194 insertions, 0 deletions
diff --git a/lib/Log.cpp b/lib/Log.cpp
new file mode 100644
index 0000000..2417f3a
--- /dev/null
+++ b/lib/Log.cpp
@@ -0,0 +1,194 @@
+/*
+   Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
+   Her Majesty the Queen in Right of Canada (Communications Research
+   Center Canada)
+
+   Copyright (C) 2018
+   Matthias P. Braendli, matthias.braendli@mpb.li
+
+    http://www.opendigitalradio.org
+ */
+/*
+   This file is part of the ODR-mmbTools.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as
+   published by the Free Software Foundation, either version 3 of the
+   License, or (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <list>
+#include <cstdarg>
+#include <cinttypes>
+#include <chrono>
+
+#include "Log.h"
+
+using namespace std;
+
+/* etiLog is a singleton used in all parts of the program to output log messages.
+ */
+Logger etiLog;
+
+void Logger::register_backend(std::shared_ptr<LogBackend> backend)
+{
+    backends.push_back(backend);
+}
+
+
+void Logger::log(log_level_t level, const char* fmt, ...)
+{
+    if (level == discard) {
+        return;
+    }
+
+    int size = 100;
+    std::string str;
+    va_list ap;
+    while (1) {
+        str.resize(size);
+        va_start(ap, fmt);
+        int n = vsnprintf((char *)str.c_str(), size, fmt, ap);
+        va_end(ap);
+        if (n > -1 && n < size) {
+            str.resize(n);
+            break;
+        }
+        if (n > -1)
+            size = n + 1;
+        else
+            size *= 2;
+    }
+
+    logstr(level, move(str));
+}
+
+void Logger::logstr(log_level_t level, std::string&& message)
+{
+    if (level == discard) {
+        return;
+	}
+
+    log_message_t m(level, move(message));
+    m_message_queue.push(move(m));
+}
+
+void Logger::io_process()
+{
+    while (1) {
+        log_message_t m;
+        try {
+            m_message_queue.wait_and_pop(m);
+        }
+        catch (const ThreadsafeQueueWakeup&) {
+            break;
+        }
+
+        auto message = m.message;
+
+        /* Remove a potential trailing newline.
+         * It doesn't look good in syslog
+         */
+        if (message[message.length()-1] == '\n') {
+            message.resize(message.length()-1);
+        }
+
+        for (auto &backend : backends) {
+            backend->log(m.level, message);
+        }
+
+        if (m.level != log_level_t::trace) {
+            std::lock_guard<std::mutex> guard(m_cerr_mutex);
+            std::cerr << levels_as_str[m.level] << " " << message << std::endl;
+        }
+    }
+}
+
+
+LogLine Logger::level(log_level_t level)
+{
+    return LogLine(this, level);
+}
+
+LogToFile::LogToFile(const std::string& filename) : name("FILE")
+{
+    FILE* fd = fopen(filename.c_str(), "a");
+    if (fd == nullptr) {
+        fprintf(stderr, "Cannot open log file !");
+        throw std::runtime_error("Cannot open log file !");
+    }
+
+    log_file.reset(fd);
+}
+
+void LogToFile::log(log_level_t level, const std::string& message)
+{
+    if (not (level == log_level_t::trace or level == log_level_t::discard)) {
+        const char* log_level_text[] = {
+            "DEBUG", "INFO", "WARN", "ERROR", "ALERT", "EMERG"};
+
+        // fprintf is thread-safe
+        fprintf(log_file.get(), SYSLOG_IDENT ": %s: %s\n",
+                log_level_text[(size_t)level], message.c_str());
+        fflush(log_file.get());
+    }
+}
+
+void LogToSyslog::log(log_level_t level, const std::string& message)
+{
+    if (not (level == log_level_t::trace or level == log_level_t::discard)) {
+        int syslog_level = LOG_EMERG;
+        switch (level) {
+            case debug: syslog_level = LOG_DEBUG; break;
+            case info:  syslog_level = LOG_INFO; break;
+                        /* we don't have the notice level */
+            case warn:  syslog_level = LOG_WARNING; break;
+            case error: syslog_level = LOG_ERR; break;
+            default:    syslog_level = LOG_CRIT; break;
+            case alert: syslog_level = LOG_ALERT; break;
+            case emerg: syslog_level = LOG_EMERG; break;
+        }
+
+        syslog(syslog_level, SYSLOG_IDENT " %s", message.c_str());
+    }
+}
+
+LogTracer::LogTracer(const string& trace_filename) : name("TRACE")
+{
+    etiLog.level(info) << "Setting up TRACE to " << trace_filename;
+
+    FILE* fd = fopen(trace_filename.c_str(), "a");
+    if (fd == nullptr) {
+        fprintf(stderr, "Cannot open trace file !");
+        throw std::runtime_error("Cannot open trace file !");
+    }
+    m_trace_file.reset(fd);
+
+    using namespace std::chrono;
+    auto now = steady_clock::now().time_since_epoch();
+    m_trace_micros_startup = duration_cast<microseconds>(now).count();
+
+    fprintf(m_trace_file.get(),
+            "0,TRACER,startup at %" PRIu64 "\n", m_trace_micros_startup);
+}
+
+void LogTracer::log(log_level_t level, const std::string& message)
+{
+    if (level == log_level_t::trace) {
+        using namespace std::chrono;
+        const auto now = steady_clock::now().time_since_epoch();
+        const auto micros = duration_cast<microseconds>(now).count();
+
+        fprintf(m_trace_file.get(), "%" PRIu64 ",%s\n",
+                micros - m_trace_micros_startup,
+                message.c_str());
+    }
+}