98 lines
2.0 KiB
Go
98 lines
2.0 KiB
Go
package main
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import (
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"bufio"
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"context"
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"fmt"
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"io"
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"log"
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"net/http"
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"os"
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"regexp"
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"strconv"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/client"
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)
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const COUNTER_SLOTS = 20
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func main() {
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containerName, ok := os.LookupEnv("CONTAINER_NAME")
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if !ok {
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log.Fatalf("unable to read CONTAINER_NAME")
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}
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listen, ok := os.LookupEnv("LISTEN")
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if !ok {
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listen = ":8080"
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}
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defaultHeaders := map[string]string{"User-Agent": "engine-api-cli-1.0"}
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cli, err := client.NewClient("unix:///var/run/docker.sock", "v1.44", nil, defaultHeaders)
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if err != nil {
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log.Fatalf("unread: %s", err)
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}
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logs, err := cli.ContainerLogs(context.TODO(), containerName, types.ContainerLogsOptions{})
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if err != nil {
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log.Fatalf("unread: %s", err)
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}
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defer logs.Close()
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counter := NewCounter()
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go counter.Scan(logs)
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http.HandleFunc("/", counter.MetricsHandler)
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err = http.ListenAndServe(listen, nil)
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log.Fatalf("unable to listen: %s", err)
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}
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type Counter struct {
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counters []int
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names []string
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current int
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}
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func NewCounter() *Counter {
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return &Counter{
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counters: make([]int, COUNTER_SLOTS),
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names: make([]string, COUNTER_SLOTS),
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}
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}
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func (c *Counter) MetricsHandler(w http.ResponseWriter, r *http.Request) {
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w.Header().Add("Content-Type", "text/plain")
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for i, name := range c.names {
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fmt.Fprintf(w, "rc3_stream_count[name=%q] %d\n", name, c.counters[i])
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}
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fmt.Fprintf(w, "rc3_stream_current[name=\"%d\"] 1\n", c.current)
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}
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func (c *Counter) ScanStdin() {
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c.Scan(os.Stdin)
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}
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func (c *Counter) Scan(in io.Reader) {
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matcher := regexp.MustCompile(`/hls/stream-([0-9]*).ts`)
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scanner := bufio.NewScanner(in)
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scanner.Split(bufio.ScanLines)
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for scanner.Scan() {
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matches := matcher.FindStringSubmatch(scanner.Text())
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if len(matches) == 2 {
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c.countViewers(matches[1])
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}
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}
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}
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func (c *Counter) countViewers(part string) {
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i, _ := strconv.Atoi(part)
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mod := i % COUNTER_SLOTS
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if c.names[mod] != part {
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c.counters[mod] = 0
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}
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c.current = i
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c.counters[mod] += 1
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c.names[mod] = part
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}
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