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Copy pathconsolelogger.go
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176 lines (154 loc) · 4.57 KB
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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
ring "container/ring"
"context"
"sync"
"github.com/minio/minio/internal/logger"
"github.com/minio/minio/internal/logger/message/log"
"github.com/minio/minio/internal/logger/target/console"
"github.com/minio/minio/internal/pubsub"
xnet "github.com/minio/pkg/net"
)
// number of log messages to buffer
const defaultLogBufferCount = 10000
// HTTPConsoleLoggerSys holds global console logger state
type HTTPConsoleLoggerSys struct {
sync.RWMutex
pubsub *pubsub.PubSub
console *console.Target
nodeName string
logBuf *ring.Ring
}
// NewConsoleLogger - creates new HTTPConsoleLoggerSys with all nodes subscribed to
// the console logging pub sub system
func NewConsoleLogger(ctx context.Context) *HTTPConsoleLoggerSys {
ps := pubsub.New()
return &HTTPConsoleLoggerSys{
pubsub: ps,
console: console.New(),
logBuf: ring.New(defaultLogBufferCount),
}
}
// SetNodeName - sets the node name if any after distributed setup has initialized
func (sys *HTTPConsoleLoggerSys) SetNodeName(nodeName string) {
if !globalIsDistErasure {
sys.nodeName = ""
return
}
host, err := xnet.ParseHost(globalLocalNodeName)
if err != nil {
logger.FatalIf(err, "Unable to start console logging subsystem")
}
sys.nodeName = host.Name
}
// HasLogListeners returns true if console log listeners are registered
// for this node or peers
func (sys *HTTPConsoleLoggerSys) HasLogListeners() bool {
return sys != nil && sys.pubsub.NumSubscribers() > 0
}
// Subscribe starts console logging for this node.
func (sys *HTTPConsoleLoggerSys) Subscribe(subCh chan interface{}, doneCh <-chan struct{}, node string, last int, logKind string, filter func(entry interface{}) bool) {
// Enable console logging for remote client.
if !sys.HasLogListeners() {
logger.AddTarget(sys)
}
cnt := 0
// by default send all console logs in the ring buffer unless node or limit query parameters
// are set.
var lastN []log.Info
if last > defaultLogBufferCount || last <= 0 {
last = defaultLogBufferCount
}
lastN = make([]log.Info, last)
sys.RLock()
sys.logBuf.Do(func(p interface{}) {
if p != nil {
lg, ok := p.(log.Info)
if ok && lg.SendLog(node, logKind) {
lastN[cnt%last] = lg
cnt++
}
}
})
sys.RUnlock()
// send last n console log messages in order filtered by node
if cnt > 0 {
for i := 0; i < last; i++ {
entry := lastN[(cnt+i)%last]
if (entry == log.Info{}) {
continue
}
select {
case subCh <- entry:
case <-doneCh:
return
}
}
}
sys.pubsub.Subscribe(subCh, doneCh, filter)
}
// Init if HTTPConsoleLoggerSys is valid, always returns nil right now
func (sys *HTTPConsoleLoggerSys) Init() error {
return nil
}
// Endpoint - dummy function for interface compatibility
func (sys *HTTPConsoleLoggerSys) Endpoint() string {
return sys.console.Endpoint()
}
// String - stringer function for interface compatibility
func (sys *HTTPConsoleLoggerSys) String() string {
return logger.ConsoleLoggerTgt
}
// Content returns the console stdout log
func (sys *HTTPConsoleLoggerSys) Content() (logs []log.Entry) {
sys.RLock()
sys.logBuf.Do(func(p interface{}) {
if p != nil {
lg, ok := p.(log.Info)
if ok {
if (lg.Entry != log.Entry{}) {
logs = append(logs, lg.Entry)
}
}
}
})
sys.RUnlock()
return
}
// Cancel - cancels the target
func (sys *HTTPConsoleLoggerSys) Cancel() {
}
// Send log message 'e' to console and publish to console
// log pubsub system
func (sys *HTTPConsoleLoggerSys) Send(e interface{}, logKind string) error {
var lg log.Info
switch e := e.(type) {
case log.Entry:
lg = log.Info{Entry: e, NodeName: sys.nodeName}
case string:
lg = log.Info{ConsoleMsg: e, NodeName: sys.nodeName}
}
sys.pubsub.Publish(lg)
sys.Lock()
// add log to ring buffer
sys.logBuf.Value = lg
sys.logBuf = sys.logBuf.Next()
sys.Unlock()
return sys.console.Send(e, string(logger.All))
}