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docker_events.go
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docker_events.go
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package main
import (
"context"
"fmt"
"strings"
"time"
"github.com/docker/docker/api/types/events"
"github.com/docker/docker/api/types/filters"
"github.com/docker/docker/client"
"github.com/pedropombeiro/qnapexporter/lib/exporter"
"github.com/pedropombeiro/qnapexporter/lib/notifications"
)
func handleDockerEvents(ctx context.Context, args httpServerArgs, annotator notifications.Annotator, exporterStatus *exporter.Status) error {
exporterStatus.Docker = "Connecting..."
cli, err := client.NewClientWithOpts(client.WithAPIVersionNegotiation())
if err != nil {
exporterStatus.Docker = err.Error()
args.logger.Println(err)
return err
}
msgs, errs := dockerEvents(ctx, cli, exporterStatus)
for {
select {
case err := <-errs:
if err != nil {
exporterStatus.Docker = err.Error()
args.logger.Println(err)
select {
case <-time.After(10 * time.Second):
// Wait for 10 seconds before retrying connection to Docker daemon
msgs, errs = dockerEvents(ctx, cli, exporterStatus)
break
case <-ctx.Done():
break
}
}
case msg := <-msgs:
t := time.Unix(0, msg.TimeNano)
m := strings.Join([]string{string(msg.Type), string(msg.Action), msg.Actor.ID, formatDockerActorAttributes(msg.Actor.Attributes)}, " ")
exporterStatus.Docker = m
args.logger.Printf("%v: %s\n", t, m)
_, _ = annotator.Post(m, t)
case <-ctx.Done():
exporterStatus.Docker = "Done"
return nil
}
}
}
func dockerEvents(ctx context.Context, cli *client.Client, exporterStatus *exporter.Status) (<-chan events.Message, <-chan error) {
opts := events.ListOptions{
Since: "1h",
Filters: filters.NewArgs(
// Containers
filters.Arg("event", "health_status"),
filters.Arg("event", "kill"),
filters.Arg("event", "restart"),
filters.Arg("event", "start"),
filters.Arg("event", "stop"),
filters.Arg("event", "update"),
// Images
filters.Arg("event", "delete"),
filters.Arg("event", "import"),
filters.Arg("event", "load"),
filters.Arg("event", "prune"),
// Plugins
filters.Arg("event", "install"),
filters.Arg("event", "remove"),
// Volumes
filters.Arg("event", "create"),
filters.Arg("event", "destroy"),
),
}
msgs, errs := cli.Events(ctx, opts)
exporterStatus.Docker = "Waiting for events"
return msgs, errs
}
func formatDockerActorAttributes(attr map[string]string) string {
var s string
for k, v := range attr {
if strings.HasPrefix(k, "com.docker.") {
continue
}
if s != "" {
s += ","
}
s += fmt.Sprintf("%s=%s", k, v)
}
return "(" + s + ")"
}