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125 lines
4.2 KiB
Go
125 lines
4.2 KiB
Go
// +build linux,cgo
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package devicemapper // import "github.com/docker/docker/pkg/devicemapper"
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import "C"
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import (
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"fmt"
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"strings"
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"github.com/sirupsen/logrus"
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)
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// DevmapperLogger defines methods required to register as a callback for
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// logging events received from devicemapper. Note that devicemapper will send
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// *all* logs regardless to callbacks (including debug logs) so it's
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// recommended to not spam the console with the outputs.
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type DevmapperLogger interface {
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// DMLog is the logging callback containing all of the information from
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// devicemapper. The interface is identical to the C libdm counterpart.
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DMLog(level int, file string, line int, dmError int, message string)
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}
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// dmLogger is the current logger in use that is being forwarded our messages.
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var dmLogger DevmapperLogger
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// LogInit changes the logging callback called after processing libdm logs for
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// error message information. The default logger simply forwards all logs to
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// logrus. Calling LogInit(nil) disables the calling of callbacks.
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func LogInit(logger DevmapperLogger) {
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dmLogger = logger
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}
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// Due to the way cgo works this has to be in a separate file, as devmapper.go has
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// definitions in the cgo block, which is incompatible with using "//export"
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// DevmapperLogCallback exports the devmapper log callback for cgo. Note that
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// because we are using callbacks, this function will be called for *every* log
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// in libdm (even debug ones because there's no way of setting the verbosity
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// level for an external logging callback).
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//export DevmapperLogCallback
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func DevmapperLogCallback(level C.int, file *C.char, line, dmErrnoOrClass C.int, message *C.char) {
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msg := C.GoString(message)
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// Track what errno libdm saw, because the library only gives us 0 or 1.
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if level < LogLevelDebug {
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if strings.Contains(msg, "busy") {
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dmSawBusy = true
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}
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if strings.Contains(msg, "File exists") {
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dmSawExist = true
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}
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if strings.Contains(msg, "No such device or address") {
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dmSawEnxio = true
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}
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if strings.Contains(msg, "No data available") {
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dmSawEnoData = true
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}
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}
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if dmLogger != nil {
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dmLogger.DMLog(int(level), C.GoString(file), int(line), int(dmErrnoOrClass), msg)
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}
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}
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// DefaultLogger is the default logger used by pkg/devicemapper. It forwards
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// all logs that are of higher or equal priority to the given level to the
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// corresponding logrus level.
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type DefaultLogger struct {
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// Level corresponds to the highest libdm level that will be forwarded to
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// logrus. In order to change this, register a new DefaultLogger.
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Level int
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}
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// DMLog is the logging callback containing all of the information from
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// devicemapper. The interface is identical to the C libdm counterpart.
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func (l DefaultLogger) DMLog(level int, file string, line, dmError int, message string) {
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if level <= l.Level {
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// Forward the log to the correct logrus level, if allowed by dmLogLevel.
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logMsg := fmt.Sprintf("libdevmapper(%d): %s:%d (%d) %s", level, file, line, dmError, message)
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switch level {
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case LogLevelFatal, LogLevelErr:
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logrus.Error(logMsg)
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case LogLevelWarn:
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logrus.Warn(logMsg)
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case LogLevelNotice, LogLevelInfo:
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logrus.Info(logMsg)
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case LogLevelDebug:
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logrus.Debug(logMsg)
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default:
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// Don't drop any "unknown" levels.
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logrus.Info(logMsg)
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}
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}
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}
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// registerLogCallback registers our own logging callback function for libdm
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// (which is DevmapperLogCallback).
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//
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// Because libdm only gives us {0,1} error codes we need to parse the logs
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// produced by libdm (to set dmSawBusy and so on). Note that by registering a
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// callback using DevmapperLogCallback, libdm will no longer output logs to
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// stderr so we have to log everything ourselves. None of this handling is
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// optional because we depend on log callbacks to parse the logs, and if we
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// don't forward the log information we'll be in a lot of trouble when
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// debugging things.
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func registerLogCallback() {
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LogWithErrnoInit()
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}
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func init() {
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// Use the default logger by default. We only allow LogLevelFatal by
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// default, because internally we mask a lot of libdm errors by retrying
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// and similar tricks. Also, libdm is very chatty and we don't want to
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// worry users for no reason.
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dmLogger = DefaultLogger{
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Level: LogLevelFatal,
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}
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// Register as early as possible so we don't miss anything.
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registerLogCallback()
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}
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