// Copyright 2017 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package dashboard
//go:generate yarn --cwd ./assets install
//go:generate yarn --cwd ./assets build
//go:generate yarn --cwd ./assets js-beautify -f bundle.js.map -r -w 1
//go:generate go-bindata -nometadata -o assets.go -prefix assets -nocompress -pkg dashboard assets/index.html assets/bundle.js assets/bundle.js.map
//go:generate sh -c "sed 's#var _bundleJs#//nolint:misspell\\\n&#' assets.go > assets.go.tmp && mv assets.go.tmp assets.go"
//go:generate sh -c "sed 's#var _bundleJsMap#//nolint:misspell\\\n&#' assets.go > assets.go.tmp && mv assets.go.tmp assets.go"
//go:generate sh -c "sed 's#var _indexHtml#//nolint:misspell\\\n&#' assets.go > assets.go.tmp && mv assets.go.tmp assets.go"
//go:generate gofmt -w -s assets.go
import (
"fmt"
"net"
"net/http"
"sync"
"sync/atomic"
"time"
"io"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rpc"
"github.com/mohae/deepcopy"
"golang.org/x/net/websocket"
)
const (
sampleLimit = 200 // Maximum number of data samples
)
// Dashboard contains the dashboard internals.
type Dashboard struct {
config *Config // Configuration values for the dashboard
listener net.Listener // Network listener listening for dashboard clients
conns map[uint32]*client // Currently live websocket connections
nextConnID uint32 // Next connection id
history *Message // Stored historical data
lock sync.Mutex // Lock protecting the dashboard's internals
sysLock sync.RWMutex // Lock protecting the stored system data
peerLock sync.RWMutex // Lock protecting the stored peer data
logLock sync.RWMutex // Lock protecting the stored log data
geodb *geoDB // geoip database instance for IP to geographical information conversions
logdir string // Directory containing the log files
quit chan chan error // Channel used for graceful exit
wg sync.WaitGroup // Wait group used to close the data collector threads
}
// client represents active websocket connection with a remote browser.
type client struct {
conn *websocket.Conn // Particular live websocket connection
msg chan *Message // Message queue for the update messages
logger log.Logger // Logger for the particular live websocket connection
}
// New creates a new dashboard instance with the given configuration.
func New(config *Config, commit string, logdir string) *Dashboard {
now := time.Now()
versionMeta := ""
if len(params.VersionMeta) > 0 {
versionMeta = fmt.Sprintf(" (%s)", params.VersionMeta)
}
return &Dashboard{
conns: make(map[uint32]*client),
config: config,
quit: make(chan chan error),
history: &Message{
General: &GeneralMessage{
Commit: commit,
Version: fmt.Sprintf("v%d.%d.%d%s", params.VersionMajor, params.VersionMinor, params.VersionPatch, versionMeta),
},
System: &SystemMessage{
ActiveMemory: emptyChartEntries(now, sampleLimit),
VirtualMemory: emptyChartEntries(now, sampleLimit),
NetworkIngress: emptyChartEntries(now, sampleLimit),
NetworkEgress: emptyChartEntries(now, sampleLimit),
ProcessCPU: emptyChartEntries(now, sampleLimit),
SystemCPU: emptyChartEntries(now, sampleLimit),
DiskRead: emptyChartEntries(now, sampleLimit),
DiskWrite: emptyChartEntries(now, sampleLimit),
},
},
logdir: logdir,
}
}
// emptyChartEntries returns a ChartEntry array containing limit number of empty samples.
func emptyChartEntries(t time.Time, limit int) ChartEntries {
ce := make(ChartEntries, limit)
for i := 0; i < limit; i++ {
ce[i] = new(ChartEntry)
}
return ce
}
// Protocols implements the node.Service interface.
func (db *Dashboard) Protocols() []p2p.Protocol { return nil }
// APIs implements the node.Service interface.
func (db *Dashboard) APIs() []rpc.API { return nil }
// Start starts the data collection thread and the listening server of the dashboard.
// Implements the node.Service interface.
func (db *Dashboard) Start(server *p2p.Server) error {
log.Info("Starting dashboard")
db.wg.Add(3)
go db.collectSystemData()
go db.streamLogs()
go db.collectPeerData()
http.HandleFunc("/", db.webHandler)
http.Handle("/api", websocket.Handler(db.apiHandler))
listener, err := net.Listen("tcp", fmt.Sprintf("%s:%d", db.config.Host, db.config.Port))
if err != nil {
return err
}
db.listener = listener
go http.Serve(listener, nil)
return nil
}
// Stop stops the data collection thread and the connection listener of the dashboard.
// Implements the node.Service interface.
func (db *Dashboard) Stop() error {
// Close the connection listener.
var errs []error
if err := db.listener.Close(); err != nil {
errs = append(errs, err)
}
// Close the collectors.
errc := make(chan error, 1)
for i := 0; i < 3; i++ {
db.quit <- errc
if err := <-errc; err != nil {
errs = append(errs, err)
}
}
// Close the connections.
db.lock.Lock()
for _, c := range db.conns {
if err := c.conn.Close(); err != nil {
c.logger.Warn("Failed to close connection", "err", err)
}
}
db.lock.Unlock()
// Wait until every goroutine terminates.
db.wg.Wait()
log.Info("Dashboard stopped")
var err error
if len(errs) > 0 {
err = fmt.Errorf("%v", errs)
}
return err
}
// webHandler handles all non-api requests, simply flattening and returning the dashboard website.
func (db *Dashboard) webHandler(w http.ResponseWriter, r *http.Request) {
log.Debug("Request", "URL", r.URL)
path := r.URL.String()
if path == "/" {
path = "/index.html"
}
blob, err := Asset(path[1:])
if err != nil {
log.Warn("Failed to load the asset", "path", path, "err", err)
http.Error(w, "not found", http.StatusNotFound)
return
}
w.Write(blob)
}
// apiHandler handles requests for the dashboard.
func (db *Dashboard) apiHandler(conn *websocket.Conn) {
id := atomic.AddUint32(&db.nextConnID, 1)
client := &client{
conn: conn,
msg: make(chan *Message, 128),
logger: log.New("id", id),
}
done := make(chan struct{})
// Start listening for messages to send.
db.wg.Add(1)
go func() {
defer db.wg.Done()
for {
select {
case <-done:
return
case msg := <-client.msg:
if err := websocket.JSON.Send(client.conn, msg); err != nil {
client.logger.Warn("Failed to send the message", "msg", msg, "err", err)
client.conn.Close()
return
}
}
}
}()
// Send the past data.
db.sysLock.RLock()
db.peerLock.RLock()
db.logLock.RLock()
h := deepcopy.Copy(db.history).(*Message)
db.sysLock.RUnlock()
db.peerLock.RUnlock()
db.logLock.RUnlock()
client.msg <- h
// Start tracking the connection and drop at connection loss.
db.lock.Lock()
db.conns[id] = client
db.lock.Unlock()
defer func() {
db.lock.Lock()
delete(db.conns, id)
db.lock.Unlock()
}()
for {
r := new(Request)
if err := websocket.JSON.Receive(conn, r); err != nil {
if err != io.EOF {
client.logger.Warn("Failed to receive request", "err", err)
}
close(done)
return
}
if r.Logs != nil {
db.handleLogRequest(r.Logs, client)
}
}
}
// sendToAll sends the given message to the active dashboards.
func (db *Dashboard) sendToAll(msg *Message) {
db.lock.Lock()
for _, c := range db.conns {
select {
case c.msg <- msg:
default:
c.conn.Close()
}
}
db.lock.Unlock()
}
