log/sink: implement ostream sink

log/sink/ostream.cpp

@@ -0,0 +1,54 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Copyright 2020, Danny Robson <danny@nerdcruft.net>
+ */
+
+#include "ostream.hpp"
+
+#include "../level.hpp"
+#include "../packet.hpp"
+
+using cruft::log::sink::ostream;
+
+
+///////////////////////////////////////////////////////////////////////////////
+ostream::ostream (std::string name, std::filesystem::path const &dst)
+    : crtp (std::move (name))
+    , m_output (dst)
+{ ; }
+
+
+///////////////////////////////////////////////////////////////////////////////
+void
+ostream::write (packet const &val)
+{
+    if (val.level > log_level ())
+        return;
+
+    static const size_t time_len = strlen("YYYY-mm-dd HHMMhSS") + 1;
+    std::string time_string (time_len - 1, '\0');
+    time_t unix_time = time (nullptr);
+
+    if (0 == strftime (&time_string[0],
+                       time_len,
+                       "%Y-%m-%d %H%Mh%S",
+                       localtime (&unix_time)))
+    {
+        warn ("failed to log time");
+        return;
+    }
+
+    m_output
+        << time_string << " ["
+        << std::setw (cruft::cast::lossless<int> (level_width ()))
+        << std::left
+        << val.level
+        << std::setw (0)
+        << "] " << val.message << std::endl;
+
+    if (needs_break (val.level))
+        breakpoint ();
+}

log/sink/ostream.hpp

@@ -0,0 +1,31 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Copyright 2020, Danny Robson <danny@nerdcruft.net>
+ */
+
+#pragma once
+
+#include "base.hpp"
+
+#include <string>
+#include <fstream>
+#include <filesystem>
+
+
+namespace cruft::log::sink {
+    class ostream : public crtp<ostream> {
+    public:
+        ostream (
+            std::string name,
+            std::filesystem::path const &path
+        );
+
+        void write (packet const&) override;
+
+    private:
+        std::ofstream m_output;
+    };
+}