lnd.xprv/log.go

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2015-12-26 09:09:17 +03:00
package main
import (
"os"
"io"
"fmt"
"path/filepath"
"github.com/btcsuite/btclog"
"github.com/jrick/logrotate/rotator"
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"github.com/lightninglabs/neutrino"
"github.com/lightningnetwork/lnd/chainntnfs"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/discovery"
"github.com/lightningnetwork/lnd/htlcswitch"
"github.com/lightningnetwork/lnd/lnwallet"
"github.com/lightningnetwork/lnd/routing"
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"github.com/roasbeef/btcd/connmgr"
)
// logWriter implements an io.Writer that outputs to both standard output and
// the write-end pipe of an initialized log rotator.
type logWriter struct{}
func (logWriter) Write(p []byte) (n int, err error) {
os.Stdout.Write(p)
logRotatorPipe.Write(p)
return len(p), nil
}
// Loggers per subsystem. A single backend logger is created and all subsytem
// loggers created from it will write to the backend. When adding new
// subsystems, add the subsystem logger variable here and to the
// subsystemLoggers map.
//
// Loggers can not be used before the log rotator has been initialized with a
// log file. This must be performed early during application startup by
// calling initLogRotator.
var (
// backendLog is the logging backend used to create all subsystem
// loggers. The backend must not be used before the log rotator has
// been initialized, or data races and/or nil pointer dereferences will
// occur.
backendLog = btclog.NewBackend(logWriter{})
// logRotator is one of the logging outputs. It should be closed on
// application shutdown.
logRotator *rotator.Rotator
// logRotatorPipe is the write-end pipe for writing to the log rotator.
// It is written to by the Write method of the logWriter type.
logRotatorPipe *io.PipeWriter
ltndLog = backendLog.Logger("LTND")
lnwlLog = backendLog.Logger("LNWL")
peerLog = backendLog.Logger("PEER")
discLog = backendLog.Logger("DISC")
rpcsLog = backendLog.Logger("RPCS")
srvrLog = backendLog.Logger("SRVR")
ntfnLog = backendLog.Logger("NTFN")
chdbLog = backendLog.Logger("CHDB")
fndgLog = backendLog.Logger("FNDG")
hswcLog = backendLog.Logger("HSWC")
utxnLog = backendLog.Logger("UTXN")
brarLog = backendLog.Logger("BRAR")
cmgrLog = backendLog.Logger("CMGR")
crtrLog = backendLog.Logger("CRTR")
btcnLog = backendLog.Logger("BTCN")
)
// Initialize package-global logger variables.
func init() {
lnwallet.UseLogger(lnwlLog)
discovery.UseLogger(discLog)
chainntnfs.UseLogger(ntfnLog)
channeldb.UseLogger(chdbLog)
htlcswitch.UseLogger(hswcLog)
connmgr.UseLogger(cmgrLog)
routing.UseLogger(crtrLog)
neutrino.UseLogger(btcnLog)
}
// subsystemLoggers maps each subsystem identifier to its associated logger.
var subsystemLoggers = map[string]btclog.Logger{
"LTND": ltndLog,
"LNWL": lnwlLog,
"PEER": peerLog,
"DISC": discLog,
"RPCS": rpcsLog,
"SRVR": srvrLog,
"NTFN": ntfnLog,
"CHDB": chdbLog,
"FNDG": fndgLog,
"HSWC": hswcLog,
"UTXN": utxnLog,
"BRAR": brarLog,
"CMGR": cmgrLog,
"CRTR": crtrLog,
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"BTCN": btcnLog,
}
// initLogRotator initializes the logging rotator to write logs to logFile and
// create roll files in the same directory. It must be called before the
// package-global log rotator variables are used.
func initLogRotator(logFile string) {
logDir, _ := filepath.Split(logFile)
err := os.MkdirAll(logDir, 0700)
if err != nil {
fmt.Fprintf(os.Stderr, "failed to create log directory: %v\n", err)
os.Exit(1)
}
r, err := rotator.New(logFile, 10*1024, false, 3)
if err != nil {
fmt.Fprintf(os.Stderr, "failed to create file rotator: %v\n", err)
os.Exit(1)
}
pr, pw := io.Pipe()
go r.Run(pr)
logRotator = r
logRotatorPipe = pw
}
// setLogLevel sets the logging level for provided subsystem. Invalid
// subsystems are ignored. Uninitialized subsystems are dynamically created as
// needed.
func setLogLevel(subsystemID string, logLevel string) {
// Ignore invalid subsystems.
logger, ok := subsystemLoggers[subsystemID]
if !ok {
return
}
// Defaults to info if the log level is invalid.
level, _ := btclog.LevelFromString(logLevel)
logger.SetLevel(level)
}
// setLogLevels sets the log level for all subsystem loggers to the passed
// level. It also dynamically creates the subsystem loggers as needed, so it
// can be used to initialize the logging system.
func setLogLevels(logLevel string) {
// Configure all sub-systems with the new logging level. Dynamically
// create loggers as needed.
for subsystemID := range subsystemLoggers {
setLogLevel(subsystemID, logLevel)
}
}
// logClosure is used to provide a closure over expensive logging operations so
// don't have to be performed when the logging level doesn't warrant it.
type logClosure func() string
// String invokes the underlying function and returns the result.
func (c logClosure) String() string {
return c()
}
// newLogClosure returns a new closure over a function that returns a string
// which itself provides a Stringer interface so that it can be used with the
// logging system.
func newLogClosure(c func() string) logClosure {
return logClosure(c)
}