/
client.go
170 lines (135 loc) · 3.87 KB
/
client.go
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package docker
import (
"context"
"encoding/json"
"log"
"strings"
"time"
dockerTypes "github.com/docker/docker/api/types"
dockerClient "github.com/docker/docker/client"
"github.com/rycus86/container-metrics/model"
"regexp"
)
type Client struct {
client *dockerClient.Client
timeout time.Duration
labelFilters []string
}
func NewClient(timeout time.Duration, labelFilters []string) (*Client, error) {
cli, err := dockerClient.NewClientWithOpts(dockerClient.FromEnv, dockerClient.WithVersion(""))
if err != nil {
return nil, err
}
return &Client{
client: cli,
timeout: timeout,
labelFilters: labelFilters,
}, nil
}
func (c *Client) GetEngineStats() (*model.EngineStats, error) {
ctx, cancel := context.WithTimeout(context.Background(), c.timeout)
defer cancel()
info, err := c.client.Info(ctx)
if err != nil {
return nil, err
}
return &model.EngineStats{
Host: info.Name,
Images: info.Images,
Containers: info.Containers,
ContainersRunning: info.ContainersRunning,
ContainersStopped: info.ContainersStopped,
ContainersPaused: info.ContainersPaused,
}, nil
}
func (c *Client) GetContainers() ([]model.Container, error) {
ctx, cancel := context.WithTimeout(context.Background(), c.timeout)
defer cancel()
dockerContainers, err := c.client.ContainerList(ctx, dockerTypes.ContainerListOptions{})
if err != nil {
return nil, err
}
containers := make([]model.Container, len(dockerContainers))
mapped := map[string]model.Container{}
for idx, item := range dockerContainers {
imageName := item.Image
// strip the hash after the @ if present
if atIndex := strings.Index(imageName, "@"); atIndex >= 0 {
imageName = imageName[0:atIndex]
}
containers[idx] = model.Container{
Id: item.ID,
Name: getContainerName(item),
Image: getContainerImage(item),
Labels: c.getLabelsFor(item),
}
mapped[item.ID] = containers[idx]
}
return containers, nil
}
func getContainerName(c dockerTypes.Container) string {
return c.Names[0][1:]
}
func getContainerImage(c dockerTypes.Container) string {
imageName := c.Image
// strip the hash after the @ if present
if atIndex := strings.Index(imageName, "@"); atIndex >= 0 {
imageName = imageName[0:atIndex]
}
return imageName
}
func (c *Client) getLabelsFor(dc dockerTypes.Container) map[string]string {
// return all labels if there aren't any filters
if len(c.labelFilters) == 1 && c.labelFilters[0] == "" {
return dc.Labels
}
filteredLabels := map[string]string{}
for name, value := range dc.Labels {
for _, filter := range c.labelFilters {
// ignore case, match from the start
if matched, err := regexp.MatchString("(?i)^"+filter, name); err == nil && matched {
filteredLabels[name] = value
}
}
}
return filteredLabels
}
func (c *Client) GetStats(container *model.Container) (*model.Stats, error) {
ctx, cancel := context.WithTimeout(context.Background(), c.timeout)
defer cancel()
response, err := c.client.ContainerStats(ctx, container.Id, false)
if err != nil {
return nil, err
}
defer response.Body.Close()
var dockerStats dockerTypes.StatsJSON
err = json.NewDecoder(response.Body).Decode(&dockerStats)
if err != nil {
return nil, err
}
return convertStats(&dockerStats, response.OSType), nil
}
func (c *Client) ListenForEvents(channel chan<- []model.Container) {
messages, errors := c.client.Events(context.Background(), dockerTypes.EventsOptions{})
for {
select {
case message := <-messages:
if message.Status == "start" || message.Status == "destroy" {
waitFor := make(chan interface{})
func() {
containers, err := c.GetContainers()
if err != nil {
log.Println("Failed to reload containers", err)
} else {
channel <- containers
}
close(waitFor)
}()
<-waitFor
}
case <-errors:
log.Println("Stop listening for events")
return
}
}
}