broke up log file + logging env

IPFS_LOGGING now takes a logging.Level string

(no more "all") cc @whyrusleeping

util/log.go

@@ -0,0 +1,65 @@
+package util
+
+import (
+	"fmt"
+	"os"
+
+	logging "github.com/jbenet/go-ipfs/Godeps/_workspace/src/github.com/op/go-logging"
+)
+
+func init() {
+	SetupLogging()
+}
+
+// LogFormat is the format used for our logger.
+var LogFormat = "%{color}%{time:2006-01-02 15:04:05.999999} %{shortfile} %{level}: %{color:reset}%{message}"
+
+// loggers is the set of loggers in the system
+var loggers = map[string]*logging.Logger{}
+
+// PErr is a shorthand printing function to output to Stderr.
+func PErr(format string, a ...interface{}) {
+	fmt.Fprintf(os.Stderr, format, a...)
+}
+
+// POut is a shorthand printing function to output to Stdout.
+func POut(format string, a ...interface{}) {
+	fmt.Fprintf(os.Stdout, format, a...)
+}
+
+// SetupLogging will initialize the logger backend and set the flags.
+func SetupLogging() {
+	backend := logging.NewLogBackend(os.Stderr, "", 0)
+	logging.SetBackend(backend)
+	logging.SetFormatter(logging.MustStringFormatter(LogFormat))
+
+	lvl := logging.ERROR
+
+	var err error
+	if logenv := os.Getenv("IPFS_LOGGING"); logenv != "" {
+		lvl, err = logging.LogLevel(logenv)
+		if err != nil {
+			PErr("invalid logging level: %s\n", logenv)
+			PErr("using logging.DEBUG\n")
+			lvl = logging.DEBUG
+		}
+	}
+
+	SetAllLoggers(lvl)
+}
+
+func SetAllLoggers(lvl logging.Level) {
+	logging.SetLevel(lvl, "")
+	for n, log := range loggers {
+		logging.SetLevel(lvl, n)
+		log.Error("setting logger: %s to %v", n, lvl)
+	}
+}
+
+// Logger retrieves a particular logger + initializes it at a particular level
+func Logger(name string) *logging.Logger {
+	log := logging.MustGetLogger(name)
+	// logging.SetLevel(lvl, name) // can't set level here.
+	loggers[name] = log
+	return log
+}