103 lines
2.3 KiB
Go
103 lines
2.3 KiB
Go
package client
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import (
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"log"
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"net/url"
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"os"
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"os/signal"
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"strconv"
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"time"
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"github.com/gorilla/websocket"
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"github.com/inhies/go-bytesize"
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"github.com/mackerelio/go-osstat/memory"
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"github.com/shirou/gopsutil/v4/cpu"
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)
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func (client *Client) Start() {
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// Setup the interrupts
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interrupt := make(chan os.Signal, 1)
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signal.Notify(interrupt, os.Interrupt)
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u := url.URL{Scheme: "ws", Host: client.ServerAddress + ":" + strconv.Itoa(client.ServerPort), Path: "/ws"}
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log.Printf("Connecting to %s", u.String())
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// sigh
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var err error
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client.conn, _, err = websocket.DefaultDialer.Dial(u.String(), nil)
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if err != nil {
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log.Fatal("dial:", err)
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}
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defer client.conn.Close()
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done := make(chan struct{})
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// Setup updater logic
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updater := make(chan string)
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go client.statusUpdater(updater)
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go func() {
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defer close(done)
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for {
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_, message, err := client.conn.ReadMessage()
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if err != nil {
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log.Println("read:", err)
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return
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}
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log.Printf("recv: %s", message)
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}
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}()
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for {
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select {
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case <-done:
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return
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case update := <-updater: // Dumping this into a var saves a second. Weird!
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// Dump the message towards the server.
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err = client.conn.WriteMessage(websocket.TextMessage, []byte(update))
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if err != nil {
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log.Println("write:", err)
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return
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}
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case <-interrupt:
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log.Println("interrupt")
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// Cleanly close the connection by sending a close message and then
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// waiting (with timeout) for the server to close the connection.
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err := client.conn.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""))
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if err != nil {
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log.Println("write close:", err)
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return
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}
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select {
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case <-done:
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case <-time.After(time.Second):
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}
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return
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}
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}
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}
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func (client *Client) statusUpdater(updater chan string) {
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for {
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// Fetch CPU usage in percentages
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cpustats, err := cpu.Percent(time.Second, false)
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if err != nil {
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log.Println("Err:", err)
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}
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// Fetch memory stats in bytes
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mem, err := memory.Get()
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if err != nil {
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log.Println("Err:", err)
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}
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// Use the ByteSize package to allow for memory calculations
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b := bytesize.New(float64(mem.Used))
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// Dump the message towards the server.
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updater <- "update;" + strconv.Itoa(int(cpustats[0])) + ";" + b.String() + ";" + strconv.Itoa(client.taskId)
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}
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}
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