forked from boyska/circolog
112 lines
2.6 KiB
Go
112 lines
2.6 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"log"
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"net"
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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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"git.lattuga.net/boyska/circolog/filtering"
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"git.lattuga.net/boyska/circolog/formatter"
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"github.com/gorilla/websocket"
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"gopkg.in/mcuadros/go-syslog.v2/format"
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"gopkg.in/mgo.v2/bson"
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)
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func main() {
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addr := flag.String("addr", "localhost:9080", "http service address")
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querySocket := flag.String("socket", "", "Path to a unix domain socket for the HTTP server")
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backlogLimit := flag.Int("n", -1, "Limit the backlog length, defaults to no limit (-1)")
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var filter filtering.ExprValue
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flag.Var(&filter, "where", "sql-like query to filter logs")
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flag.Parse()
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interrupt := make(chan os.Signal, 1)
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signal.Notify(interrupt, os.Interrupt)
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var d *websocket.Dialer
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u := url.URL{Scheme: "ws",
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Host: *addr, // ignored in case of -socket; see the Dialer below
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Path: "/ws",
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}
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q := u.Query()
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q.Set("fmt", "bson")
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if *backlogLimit >= 0 {
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q.Set("l", strconv.Itoa(*backlogLimit))
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}
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u.RawQuery = q.Encode()
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if *querySocket != "" {
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d = &websocket.Dialer{
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NetDial: func(network, addr string) (net.Conn, error) {
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return net.Dial("unix", *querySocket)
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},
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HandshakeTimeout: 45 * time.Second, // same as DefaultDialer
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}
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log.Printf("connecting to %s", *querySocket)
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} else {
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d = websocket.DefaultDialer
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log.Printf("connecting to %s", *addr)
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}
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c, _, err := d.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 c.Close()
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log.Println("connected!", u.String())
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done := make(chan struct{})
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go func() {
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defer close(done)
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for {
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_, serialized, err := c.ReadMessage()
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if err != nil {
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log.Println("close:", err)
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return
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}
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var parsed format.LogParts
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if err := bson.Unmarshal(serialized, &parsed); err != nil {
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log.Println("invalid BSON", err)
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continue
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}
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if !filter.Validate(parsed) {
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continue
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}
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if err := formatter.WriteFormatted(os.Stdout, formatter.FormatSyslog, parsed); err != nil {
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log.Println("error printing", err)
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}
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fmt.Println()
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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 <-interrupt:
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log.Println("interrupt")
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// Cleanly close the connection by sending a close message and then waiting (with timeout) for the
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// server to close the connection.
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err := c.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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log.Println("Successfully close")
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case <-time.After(1 * time.Second):
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log.Println("Forced close")
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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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