mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
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c06e7a142c
Cache sanitized label names and return them next time. This reduces the number of allocations and speeds up the SanitizeLabelName() function for common case when the number of unique label names is smaller than 100k
115 lines
3.1 KiB
Go
115 lines
3.1 KiB
Go
package docker
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import (
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"encoding/json"
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"fmt"
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"strconv"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discoveryutils"
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)
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// See https://github.com/moby/moby/blob/314759dc2f4745925d8dec6d15acc7761c6e5c92/docs/api/v1.41.yaml#L4024
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type container struct {
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ID string
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Names []string
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Labels map[string]string
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Ports []struct {
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IP string
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PrivatePort int
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PublicPort int
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Type string
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}
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HostConfig struct {
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NetworkMode string
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}
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NetworkSettings struct {
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Networks map[string]struct {
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IPAddress string
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NetworkID string
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}
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}
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}
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func getContainersLabels(cfg *apiConfig) ([]map[string]string, error) {
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networkLabels, err := getNetworksLabelsByNetworkID(cfg)
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if err != nil {
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return nil, err
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}
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containers, err := getContainers(cfg)
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if err != nil {
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return nil, err
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}
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return addContainersLabels(containers, networkLabels, cfg.port, cfg.hostNetworkingHost), nil
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}
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func getContainers(cfg *apiConfig) ([]container, error) {
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resp, err := cfg.getAPIResponse("/containers/json")
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if err != nil {
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return nil, fmt.Errorf("cannot query dockerd api for containers: %w", err)
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}
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return parseContainers(resp)
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}
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func parseContainers(data []byte) ([]container, error) {
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var containers []container
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if err := json.Unmarshal(data, &containers); err != nil {
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return nil, fmt.Errorf("cannot parse containers: %w", err)
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}
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return containers, nil
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}
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func addContainersLabels(containers []container, networkLabels map[string]map[string]string, defaultPort int, hostNetworkingHost string) []map[string]string {
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var ms []map[string]string
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for i := range containers {
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c := &containers[i]
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if len(c.Names) == 0 {
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continue
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}
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for _, n := range c.NetworkSettings.Networks {
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var added bool
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for _, p := range c.Ports {
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if p.Type != "tcp" {
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continue
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}
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m := map[string]string{
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"__address__": discoveryutils.JoinHostPort(n.IPAddress, p.PrivatePort),
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"__meta_docker_network_ip": n.IPAddress,
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"__meta_docker_port_private": strconv.Itoa(p.PrivatePort),
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}
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if p.PublicPort > 0 {
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m["__meta_docker_port_public"] = strconv.Itoa(p.PublicPort)
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m["__meta_docker_port_public_ip"] = p.IP
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}
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addCommonLabels(m, c, networkLabels[n.NetworkID])
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ms = append(ms, m)
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added = true
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}
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if !added {
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// Use fallback port when no exposed ports are available or if all are non-TCP
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addr := hostNetworkingHost
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if c.HostConfig.NetworkMode != "host" {
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addr = discoveryutils.JoinHostPort(n.IPAddress, defaultPort)
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}
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m := map[string]string{
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"__address__": addr,
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"__meta_docker_network_ip": n.IPAddress,
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}
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addCommonLabels(m, c, networkLabels[n.NetworkID])
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ms = append(ms, m)
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}
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}
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}
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return ms
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}
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func addCommonLabels(m map[string]string, c *container, networkLabels map[string]string) {
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m["__meta_docker_container_id"] = c.ID
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m["__meta_docker_container_name"] = c.Names[0]
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m["__meta_docker_container_network_mode"] = c.HostConfig.NetworkMode
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for k, v := range c.Labels {
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m[discoveryutils.SanitizeLabelName("__meta_docker_container_label_"+k)] = v
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}
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for k, v := range networkLabels {
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m[k] = v
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}
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}
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