1 files changed, 228 insertions, 0 deletions
diff --git a/vendor/github.com/pion/logging/logger.go b/vendor/github.com/pion/logging/logger.go
new file mode 100644
index 0000000..35f6505
--- /dev/null
+++ b/vendor/github.com/pion/logging/logger.go
@@ -0,0 +1,228 @@
+package logging
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"strings"
+	"sync"
+)
+
+// Use this abstraction to ensure thread-safe access to the logger's io.Writer
+// (which could change at runtime)
+type loggerWriter struct {
+	sync.RWMutex
+	output io.Writer
+}
+
+func (lw *loggerWriter) SetOutput(output io.Writer) {
+	lw.Lock()
+	defer lw.Unlock()
+	lw.output = output
+}
+
+func (lw *loggerWriter) Write(data []byte) (int, error) {
+	lw.RLock()
+	defer lw.RUnlock()
+	return lw.output.Write(data)
+}
+
+// DefaultLeveledLogger encapsulates functionality for providing logging at
+// user-defined levels
+type DefaultLeveledLogger struct {
+	level  LogLevel
+	writer *loggerWriter
+	trace  *log.Logger
+	debug  *log.Logger
+	info   *log.Logger
+	warn   *log.Logger
+	err    *log.Logger
+}
+
+// WithTraceLogger is a chainable configuration function which sets the
+// Trace-level logger
+func (ll *DefaultLeveledLogger) WithTraceLogger(log *log.Logger) *DefaultLeveledLogger {
+	ll.trace = log
+	return ll
+}
+
+// WithDebugLogger is a chainable configuration function which sets the
+// Debug-level logger
+func (ll *DefaultLeveledLogger) WithDebugLogger(log *log.Logger) *DefaultLeveledLogger {
+	ll.debug = log
+	return ll
+}
+
+// WithInfoLogger is a chainable configuration function which sets the
+// Info-level logger
+func (ll *DefaultLeveledLogger) WithInfoLogger(log *log.Logger) *DefaultLeveledLogger {
+	ll.info = log
+	return ll
+}
+
+// WithWarnLogger is a chainable configuration function which sets the
+// Warn-level logger
+func (ll *DefaultLeveledLogger) WithWarnLogger(log *log.Logger) *DefaultLeveledLogger {
+	ll.warn = log
+	return ll
+}
+
+// WithErrorLogger is a chainable configuration function which sets the
+// Error-level logger
+func (ll *DefaultLeveledLogger) WithErrorLogger(log *log.Logger) *DefaultLeveledLogger {
+	ll.err = log
+	return ll
+}
+
+// WithOutput is a chainable configuration function which sets the logger's
+// logging output to the supplied io.Writer
+func (ll *DefaultLeveledLogger) WithOutput(output io.Writer) *DefaultLeveledLogger {
+	ll.writer.SetOutput(output)
+	return ll
+}
+
+func (ll *DefaultLeveledLogger) logf(logger *log.Logger, level LogLevel, format string, args ...interface{}) {
+	if ll.level.Get() < level {
+		return
+	}
+
+	callDepth := 3 // this frame + wrapper func + caller
+	msg := fmt.Sprintf(format, args...)
+	if err := logger.Output(callDepth, msg); err != nil {
+		fmt.Fprintf(os.Stderr, "Unable to log: %s", err)
+	}
+}
+
+// SetLevel sets the logger's logging level
+func (ll *DefaultLeveledLogger) SetLevel(newLevel LogLevel) {
+	ll.level.Set(newLevel)
+}
+
+// Trace emits the preformatted message if the logger is at or below LogLevelTrace
+func (ll *DefaultLeveledLogger) Trace(msg string) {
+	ll.logf(ll.trace, LogLevelTrace, msg)
+}
+
+// Tracef formats and emits a message if the logger is at or below LogLevelTrace
+func (ll *DefaultLeveledLogger) Tracef(format string, args ...interface{}) {
+	ll.logf(ll.trace, LogLevelTrace, format, args...)
+}
+
+// Debug emits the preformatted message if the logger is at or below LogLevelDebug
+func (ll *DefaultLeveledLogger) Debug(msg string) {
+	ll.logf(ll.debug, LogLevelDebug, msg)
+}
+
+// Debugf formats and emits a message if the logger is at or below LogLevelDebug
+func (ll *DefaultLeveledLogger) Debugf(format string, args ...interface{}) {
+	ll.logf(ll.debug, LogLevelDebug, format, args...)
+}
+
+// Info emits the preformatted message if the logger is at or below LogLevelInfo
+func (ll *DefaultLeveledLogger) Info(msg string) {
+	ll.logf(ll.info, LogLevelInfo, msg)
+}
+
+// Infof formats and emits a message if the logger is at or below LogLevelInfo
+func (ll *DefaultLeveledLogger) Infof(format string, args ...interface{}) {
+	ll.logf(ll.info, LogLevelInfo, format, args...)
+}
+
+// Warn emits the preformatted message if the logger is at or below LogLevelWarn
+func (ll *DefaultLeveledLogger) Warn(msg string) {
+	ll.logf(ll.warn, LogLevelWarn, msg)
+}
+
+// Warnf formats and emits a message if the logger is at or below LogLevelWarn
+func (ll *DefaultLeveledLogger) Warnf(format string, args ...interface{}) {
+	ll.logf(ll.warn, LogLevelWarn, format, args...)
+}
+
+// Error emits the preformatted message if the logger is at or below LogLevelError
+func (ll *DefaultLeveledLogger) Error(msg string) {
+	ll.logf(ll.err, LogLevelError, msg)
+}
+
+// Errorf formats and emits a message if the logger is at or below LogLevelError
+func (ll *DefaultLeveledLogger) Errorf(format string, args ...interface{}) {
+	ll.logf(ll.err, LogLevelError, format, args...)
+}
+
+// NewDefaultLeveledLoggerForScope returns a configured LeveledLogger
+func NewDefaultLeveledLoggerForScope(scope string, level LogLevel, writer io.Writer) *DefaultLeveledLogger {
+	if writer == nil {
+		writer = os.Stdout
+	}
+	logger := &DefaultLeveledLogger{
+		writer: &loggerWriter{output: writer},
+		level:  level,
+	}
+	return logger.
+		WithTraceLogger(log.New(logger.writer, fmt.Sprintf("%s TRACE: ", scope), log.Lmicroseconds|log.Lshortfile)).
+		WithDebugLogger(log.New(logger.writer, fmt.Sprintf("%s DEBUG: ", scope), log.Lmicroseconds|log.Lshortfile)).
+		WithInfoLogger(log.New(logger.writer, fmt.Sprintf("%s INFO: ", scope), log.LstdFlags)).
+		WithWarnLogger(log.New(logger.writer, fmt.Sprintf("%s WARNING: ", scope), log.LstdFlags)).
+		WithErrorLogger(log.New(logger.writer, fmt.Sprintf("%s ERROR: ", scope), log.LstdFlags))
+}
+
+// DefaultLoggerFactory define levels by scopes and creates new DefaultLeveledLogger
+type DefaultLoggerFactory struct {
+	Writer          io.Writer
+	DefaultLogLevel LogLevel
+	ScopeLevels     map[string]LogLevel
+}
+
+// NewDefaultLoggerFactory creates a new DefaultLoggerFactory
+func NewDefaultLoggerFactory() *DefaultLoggerFactory {
+	factory := DefaultLoggerFactory{}
+	factory.DefaultLogLevel = LogLevelError
+	factory.ScopeLevels = make(map[string]LogLevel)
+	factory.Writer = os.Stdout
+
+	logLevels := map[string]LogLevel{
+		"DISABLE": LogLevelDisabled,
+		"ERROR":   LogLevelError,
+		"WARN":    LogLevelWarn,
+		"INFO":    LogLevelInfo,
+		"DEBUG":   LogLevelDebug,
+		"TRACE":   LogLevelTrace,
+	}
+
+	for name, level := range logLevels {
+		env := os.Getenv(fmt.Sprintf("PION_LOG_%s", name))
+
+		if env == "" {
+			env = os.Getenv(fmt.Sprintf("PIONS_LOG_%s", name))
+		}
+
+		if env == "" {
+			continue
+		}
+
+		if strings.ToLower(env) == "all" {
+			factory.DefaultLogLevel = level
+			continue
+		}
+
+		scopes := strings.Split(strings.ToLower(env), ",")
+		for _, scope := range scopes {
+			factory.ScopeLevels[scope] = level
+		}
+	}
+
+	return &factory
+}
+
+// NewLogger returns a configured LeveledLogger for the given , argsscope
+func (f *DefaultLoggerFactory) NewLogger(scope string) LeveledLogger {
+	logLevel := f.DefaultLogLevel
+	if f.ScopeLevels != nil {
+		scopeLevel, found := f.ScopeLevels[scope]
+
+		if found {
+			logLevel = scopeLevel
+		}
+	}
+	return NewDefaultLeveledLoggerForScope(scope, logLevel, f.Writer)
+}