#pragma once
+#include <atomic>
#include <map>
#include <queue>
#include <string>
#if !defined(_WIN32) // POSIX
#include <unistd.h>
#endif
+#include "util/basic_macros.h"
+#include "util/stream.h"
#include "irrlichttypes.h"
class ILogOutput;
LL_ACTION, // In-game actions
LL_INFO,
LL_VERBOSE,
+ LL_TRACE,
LL_MAX,
};
// Logs without a prefix
void logRaw(LogLevel lev, const std::string &text);
- void setTraceEnabled(bool enable) { m_trace_enabled = enable; }
- bool getTraceEnabled() { return m_trace_enabled; }
-
static LogLevel stringToLevel(const std::string &name);
static const std::string getLevelLabel(LogLevel lev);
+ bool hasOutput(LogLevel level) {
+ return m_has_outputs[level].load(std::memory_order_relaxed);
+ }
+
static LogColor color_mode;
private:
const std::string getThreadName();
std::vector<ILogOutput *> m_outputs[LL_MAX];
+ std::atomic<bool> m_has_outputs[LL_MAX];
// Should implement atomic loads and stores (even though it's only
// written to when one thread has access currently).
volatile bool m_silenced_levels[LL_MAX];
std::map<std::thread::id, std::string> m_thread_names;
mutable std::mutex m_mutex;
- bool m_trace_enabled;
};
class ILogOutput {
Logger &m_logger;
};
+#ifdef __ANDROID__
+class AndroidLogOutput : public ICombinedLogOutput {
+public:
+ void logRaw(LogLevel lev, const std::string &line);
+};
+#endif
-extern StreamLogOutput stdout_output;
-extern StreamLogOutput stderr_output;
-extern std::ostream null_stream;
+/*
+ * LogTarget
+ *
+ * This is the interface that sits between the LogStreams and the global logger.
+ * Primarily used to route streams to log levels, but could also enable other
+ * custom behavior.
+ *
+ */
+class LogTarget {
+public:
+ // Must be thread-safe. These can be called from any thread.
+ virtual bool hasOutput() = 0;
+ virtual void log(const std::string &buf) = 0;
+};
-extern std::ostream *dout_con_ptr;
-extern std::ostream *derr_con_ptr;
-extern std::ostream *dout_server_ptr;
-extern std::ostream *derr_server_ptr;
-#ifndef SERVER
-extern std::ostream *dout_client_ptr;
-extern std::ostream *derr_client_ptr;
-#endif
+/*
+ * StreamProxy
+ *
+ * An ostream-like object that can proxy to a real ostream or do nothing,
+ * depending on how it is configured. See LogStream below.
+ *
+ */
+class StreamProxy {
+public:
+ StreamProxy(std::ostream *os) : m_os(os) { }
+
+ template<typename T>
+ StreamProxy& operator<<(T&& arg) {
+ if (m_os) {
+ *m_os << std::forward<T>(arg);
+ }
+ return *this;
+ }
-extern Logger g_logger;
+ StreamProxy& operator<<(std::ostream& (*manip)(std::ostream&)) {
+ if (m_os) {
+ *m_os << manip;
+ }
+ return *this;
+ }
-// Writes directly to all LL_NONE log outputs for g_logger with no prefix.
-extern std::ostream rawstream;
+private:
+ std::ostream *m_os;
+};
-extern std::ostream errorstream;
-extern std::ostream warningstream;
-extern std::ostream actionstream;
-extern std::ostream infostream;
-extern std::ostream verbosestream;
-extern std::ostream dstream;
-#define TRACEDO(x) do { \
- if (g_logger.getTraceEnabled()) { \
- x; \
- } \
-} while (0)
+/*
+ * LogStream
+ *
+ * The public interface for log streams (infostream, verbosestream, etc).
+ *
+ * LogStream minimizes the work done when a given stream is off. (meaning
+ * it has no output targets, so it goes to /dev/null)
+ *
+ * For example, consider:
+ *
+ * verbosestream << "hello world" << 123 << std::endl;
+ *
+ * The compiler evaluates this as:
+ *
+ * (((verbosestream << "hello world") << 123) << std::endl)
+ * ^ ^
+ *
+ * If `verbosestream` is on, the innermost expression (marked by ^) will return
+ * a StreamProxy that forwards to a real ostream, that feeds into the logger.
+ * However, if `verbosestream` is off, it will return a StreamProxy that does
+ * nothing on all later operations. Specifically, CPU time won't be wasted
+ * writing "hello world" and 123 into a buffer, or formatting the log entry.
+ *
+ * It is also possible to directly check if the stream is on/off:
+ *
+ * if (verbosestream) {
+ * auto data = ComputeExpensiveDataForTheLog();
+ * verbosestream << data << endl;
+ * }
+ *
+*/
-#define TRACESTREAM(x) TRACEDO(verbosestream x)
+class LogStream {
+public:
+ LogStream() = delete;
+ DISABLE_CLASS_COPY(LogStream);
+
+ LogStream(LogTarget &target) :
+ m_target(target),
+ m_buffer(std::bind(&LogStream::internalFlush, this, std::placeholders::_1)),
+ m_dummy_buffer(),
+ m_stream(&m_buffer),
+ m_dummy_stream(&m_dummy_buffer),
+ m_proxy(&m_stream),
+ m_dummy_proxy(nullptr) { }
+
+ template<typename T>
+ StreamProxy& operator<<(T&& arg) {
+ StreamProxy& sp = m_target.hasOutput() ? m_proxy : m_dummy_proxy;
+ sp << std::forward<T>(arg);
+ return sp;
+ }
+
+ StreamProxy& operator<<(std::ostream& (*manip)(std::ostream&)) {
+ StreamProxy& sp = m_target.hasOutput() ? m_proxy : m_dummy_proxy;
+ sp << manip;
+ return sp;
+ }
+
+ operator bool() {
+ return m_target.hasOutput();
+ }
-#define dout_con (*dout_con_ptr)
-#define derr_con (*derr_con_ptr)
-#define dout_server (*dout_server_ptr)
+ void internalFlush(const std::string &buf) {
+ m_target.log(buf);
+ }
+
+ operator std::ostream&() {
+ return m_target.hasOutput() ? m_stream : m_dummy_stream;
+ }
-#ifndef SERVER
- #define dout_client (*dout_client_ptr)
+private:
+ // 10 streams per thread x (256 + overhead) ~ 3K per thread
+ static const int BUFFER_LENGTH = 256;
+ LogTarget &m_target;
+ StringStreamBuffer<BUFFER_LENGTH> m_buffer;
+ DummyStreamBuffer m_dummy_buffer;
+ std::ostream m_stream;
+ std::ostream m_dummy_stream;
+ StreamProxy m_proxy;
+ StreamProxy m_dummy_proxy;
+
+};
+
+#ifdef __ANDROID__
+extern AndroidLogOutput stdout_output;
+extern AndroidLogOutput stderr_output;
+#else
+extern StreamLogOutput stdout_output;
+extern StreamLogOutput stderr_output;
#endif
+
+extern Logger g_logger;
+
+/*
+ * By making the streams thread_local, each thread has its own
+ * private buffer. Two or more threads can write to the same stream
+ * simultaneously (lock-free), and there won't be any interference.
+ *
+ * The finished lines are sent to a LogTarget which is a global (not thread-local)
+ * object, and from there relayed to g_logger. The final writes are serialized
+ * by the mutex in g_logger.
+*/
+
+extern thread_local LogStream dstream;
+extern thread_local LogStream rawstream; // Writes directly to all LL_NONE log outputs with no prefix.
+extern thread_local LogStream errorstream;
+extern thread_local LogStream warningstream;
+extern thread_local LogStream actionstream;
+extern thread_local LogStream infostream;
+extern thread_local LogStream verbosestream;
+extern thread_local LogStream tracestream;
+// TODO: Search/replace these with verbose/tracestream
+extern thread_local LogStream derr_con;
+extern thread_local LogStream dout_con;
+
+#define TRACESTREAM(x) do { \
+ if (tracestream) { \
+ tracestream x; \
+ } \
+} while (0)
projects / dragonfireclient.git / blobdiff