goThoom/logger.go at main · Distortions81/goThoom · GitHub

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package main

import (
	"fmt"
	"io"
	"log"
	"os"
	"path/filepath"
	"sync"
	"time"
)

var (
	errorLogger  *log.Logger
	errorLogPath string
	errorLogOnce sync.Once

	debugLogger  *log.Logger
	debugLogPath string
	debugLogOnce sync.Once
	// debugPacketDumpLen limits how many bytes of a packet payload are logged.
	// A value of 0 dumps the entire payload.
	debugPacketDumpLen = 256
)

func setupLogging(debug bool) {
    logDir := "logs"
    if !isWASM {
        if err := os.MkdirAll(logDir, 0755); err != nil {
            log.Printf("could not create log directory: %v", err)
        }
    }
	ts := time.Now().Format("20060102-150405")

    errorLogPath = filepath.Join(logDir, fmt.Sprintf("error-%s.log", ts))
	errorLogOnce = sync.Once{}
	errorLogger = log.New(os.Stdout, "", log.LstdFlags)
	log.SetOutput(errorLogger.Writer())

	setDebugLogging(debug)
}

func logError(format string, v ...interface{}) {
    if errorLogger != nil {
        errorLogOnce.Do(func() {
            if isWASM {
                // No file backend in WASM; keep stdout only.
                return
            }
            if f, err := os.Create(errorLogPath); err == nil {
                errorLogger.SetOutput(io.MultiWriter(os.Stdout, f))
                log.SetOutput(errorLogger.Writer())
            }
        })
        errorLogger.Printf(format, v...)
    }
	if !silent {
		consoleMessage(fmt.Sprintf(format, v...))
	}
}

func logDebug(format string, v ...interface{}) {
    if debugLogger != nil {
        debugLogOnce.Do(func() {
            if isWASM {
                return
            }
            if f, err := os.Create(debugLogPath); err == nil {
                debugLogger.SetOutput(io.MultiWriter(os.Stdout, f))
            }
        })
        debugLogger.Printf(format, v...)
    }
}

func logWarn(format string, v ...interface{}) {
	msg := fmt.Sprintf(format, v...)
	if errorLogger != nil {
        errorLogOnce.Do(func() {
            if isWASM {
                return
            }
            if f, err := os.Create(errorLogPath); err == nil {
                errorLogger.SetOutput(io.MultiWriter(os.Stdout, f))
                log.SetOutput(errorLogger.Writer())
            }
        })
        errorLogger.Printf("warning: %s", msg)
    }
	if !silent {
		consoleMessage(fmt.Sprintf("warning: %s", msg))
	}
}

func logDebugPacket(prefix string, data []byte) {
    if debugLogger == nil {
        return
    }
    debugLogOnce.Do(func() {
        if isWASM {
            return
        }
        if f, err := os.Create(debugLogPath); err == nil {
            debugLogger.SetOutput(io.MultiWriter(os.Stdout, f))
        }
    })
	n := len(data)
	dump := data
	if debugPacketDumpLen > 0 && n > debugPacketDumpLen {
		dump = data[:debugPacketDumpLen]
	}
	debugLogger.Printf("%s len=%d payload=% x", prefix, n, dump)
}

func setDebugLogging(enabled bool) {
	if enabled {
		logDir := "logs"
		if err := os.MkdirAll(logDir, 0755); err != nil {
			log.Printf("could not create log directory: %v", err)
		}
		ts := time.Now().Format("20060102-150405")
		debugLogPath = filepath.Join(logDir, fmt.Sprintf("debug-%s.log", ts))
		debugLogOnce = sync.Once{}
		debugLogger = log.New(os.Stdout, "", log.LstdFlags)
	} else {
		debugLogger = nil
	}
}