Intial Commit

2020-11-07 19:40:39 +01:00 · 2020-11-07 19:40:39 +01:00 · 661f4e86a2
commit 661f4e86a2
13 changed files with 1489 additions and 0 deletions
--- a/.drone.yml
+++ b/.drone.yml
@ -0,0 +1,35 @@
+kind: pipeline
+type: docker
+name: amd64
+steps:
+- name: unit test
+  image: docker.io/volkerraschek/build-image:latest
+  commands:
+  - make --jobs=$(nproc) test/coverage
+  volumes:
+  - name: dockerAPI
+    path: /var/run/docker.sock
+  when:
+    event:
+    - push
+    - pull_request
+    - tag
+- name: notify
+  image: drillster/drone-email
+  environment:
+    PLUGIN_HOST:
+      from_secret: smtp_host
+    PLUGIN_USERNAME:
+      from_secret: smtp_username
+    PLUGIN_PASSWORD:
+      from_secret: smtp_password
+    PLUGIN_FROM:
+      from_secret: smtp_mail_address
+  when:
+    status:
+    - changed
+    - failure
+volumes:
+- name: dockerAPI
+  host:
+    path: /var/run/docker.sock
--- a/.editorconfig
+++ b/.editorconfig
@ -0,0 +1,12 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = false
+
+[Makefile]
+indent_style = tab
--- a/.gitattributes
+++ b/.gitattributes
@ -0,0 +1 @@
+Makefile eol=lf
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,5 @@
+# directories
+.vscode/
+
+# coverage files
+coverage*
--- a/13
+++ b/13
@ -0,0 +1,13 @@
+Copyright 2020 Markus Pesch
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
--- a/52
+++ b/52
@ -0,0 +1,52 @@
+# GOPROXY settings
+# If no GOPROXY environment variable available, the pre-defined GOPROXY from go
+# env to download and validate go modules is used. Exclude downloading and
+# validation of all private modules which are pre-defined in GOPRIVATE. If no
+# GOPRIVATE variable defined, the variable of go env is used.
+GOPROXY?=$(shell go env GOPROXY)
+GOPRIVATE?=$(shell go env GOPRIVATE)
+
+# CONTAINER_RUNTIME
+# The CONTAINER_RUNTIME variable will be used to specified the path to a
+# container runtime. This is needed to start and run a container images.
+CONTAINER_RUNTIME?=$(shell which docker)
+CONTAINER_IMAGE_VERSION?=latest
+
+# TEST
+# ==============================================================================
+PHONY+=test/unit
+test/unit:
+	go test -v -race -coverprofile=coverage.txt -covermode=atomic -timeout 600s -count=1 ./...
+
+test/coverage: test/unit
+	go tool cover -html=coverage.txt
+
+# CONTAINER STEPS - TEST
+# ==============================================================================
+PHONY+=container-run/test/unit
+container-run/test/unit:
+	$(MAKE) container-run COMMAND=${@:container-run/%=%}
+
+PHONY+=container-run/test/coverage
+container-run/test/coverage:
+	$(MAKE) container-run COMMAND=${@:container-run/%=%}
+
+# GENERAL CONTAINER COMMAND
+# ==============================================================================
+PHONY+=container-run
+container-run:
+	${CONTAINER_RUNTIME} run \
+		--rm \
+		--volume ${PWD}:/workspace \
+		--volume /var/run/docker.sock:/var/run/docker.sock \
+		docker.io/volkerraschek/build-image:latest \
+			make ${COMMAND} \
+				GOPROXY=${GOPROXY} \
+				GOPRIVATE=${GOPRIVATE} \
+				VERSION=${VERSION:v%=%}
+
+# PHONY
+# ==============================================================================
+# Declare the contents of the PHONY variable as phony.  We keep that information
+# in a variable so we can use it in if_changed.
+.PHONY: ${PHONY}
--- a/README.md
+++ b/README.md
@ -0,0 +1,74 @@
+# dockerutils
+
+[![Build Status](https://drone.cryptic.systems/api/badges/volker.raschek/dockerutils/status.svg)](https://drone.cryptic.systems/volker.raschek/dockerutils)
+
+dockerutils is a small library which extends the official docker library to
+create and start images over a builder. Additionally the library provide
+functions for easy removeing resources based on ids, names or labels which the
+official library does not directly supports.
+
+## Installing
+
+Install the library by the following command:
+
+```bash
+go get git.cryptic.systems/volker.raschek/dockerutils
+```
+
+## Usage
+
+### Example: Create and remove postgreSQL container
+
+```go
+package main
+
+import "git.cryptic.systems/volker.raschek/dockerutils"
+
+func noErr(err){
+  if err != nil {
+    panic(err)
+  }
+}
+
+func main(){
+  dockerClient, err := dockerutils.New()
+  noErr(err)
+
+  postgresContainerID, err := dockerClient.NewBuilder("postgres:13-alpine").
+    Port(fmt.Sprintf("5432:5432/tcp", postgresHostPort)).
+    Pull().
+    AddEnv("PGTZ", "Europe/Berlin").
+    AddEnv("POSTGRES_PASSWORD", postgres).
+    AddEnv("TZ", "Europe/Berlin").
+    Mount("/etc/localtime", "/etc/localtime").
+    Start(context.Background())
+  noErr(err)
+  defer func(){dockerClient.ContainerRemoveByIDs(context.Background(), postgresContainerID)}
+}
+```
+
+### Example: Create and remove container network
+
+```go
+package main
+
+import (
+  "git.cryptic.systems/volker.raschek/dockerutils"
+  "github.com/docker/docker/api/types"
+)
+
+func noErr(err){
+  if err != nil {
+    panic(err)
+  }
+}
+
+func main(){
+  dockerClient, err := dockerutils.New()
+  noErr(err)
+
+  containerNetwork, err := dockerClient.NetworkCreate(ctx, "my-network", tt.NetworkCreate{Labels: map[string]string{"key": "value"}})
+  noErr(err)
+  defer func(){dockerClient.NetworkRemove(context.Background(), containerNetwork.ID)}
+}
+```
--- a/builder.go
+++ b/builder.go
@ -0,0 +1,236 @@
+package dockerutils
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/container"
+	"github.com/docker/docker/api/types/network"
+	"github.com/docker/go-connections/nat"
+)
+
+// Builder is a wrapper around the official docker API to start a container
+// image.
+type Builder struct {
+	client          *Client
+	containerConfig *container.Config
+	containerName   string
+	hostConfig      *container.HostConfig
+	networkConfig   *network.NetworkingConfig
+	networks        map[string][]string
+	ports           []string
+	pull            bool
+	waitForHealthy  bool
+}
+
+// AddEnv to the container
+func (builder *Builder) AddEnv(key string, value string) *Builder {
+	builder.containerConfig.Env = append(builder.containerConfig.Env, fmt.Sprintf("%v=%v", key, value))
+	return builder
+}
+
+// AddLabel to the container
+func (builder *Builder) AddLabel(key string, value string) *Builder {
+	builder.containerConfig.Labels[key] = value
+	return builder
+}
+
+// Env set environment variables to the container
+func (builder *Builder) Env(env map[string]string) *Builder {
+	builder.containerConfig.Labels = make(map[string]string)
+	for key, value := range env {
+		builder.containerConfig.Env = append(builder.containerConfig.Env, fmt.Sprintf("%v=%v", key, value))
+	}
+	return builder
+}
+
+// Labels set labels to the container
+func (builder *Builder) Labels(labels map[string]string) *Builder {
+	builder.containerConfig.Labels = labels
+	return builder
+}
+
+// Memory defines a memory limit for the container
+func (builder *Builder) Memory(limit int64) *Builder {
+	builder.hostConfig.Memory = limit
+	return builder
+}
+
+// Mount a source volume or hostpath into the filesystem of the container
+func (builder *Builder) Mount(source string, dest string) *Builder {
+	builder.hostConfig.Binds = append(builder.hostConfig.Binds, fmt.Sprintf("%v:%v", source, dest))
+	return builder
+}
+
+// Mounts a set of source volumes or hostpath into the filesystem of the
+// container
+func (builder *Builder) Mounts(mounts map[string]string) *Builder {
+	for source, dest := range mounts {
+		builder.Mount(source, dest)
+	}
+	return builder
+}
+
+// Network add the container with aliasses to a specific network
+func (builder *Builder) Network(networkName string, aliasses ...string) *Builder {
+	builder.networks[networkName] = aliasses
+	return builder
+}
+
+// Port defines a port forwarding from the host machine to the container
+// Examples:
+// - 8080:8080
+// - 10.6.231.10:8080:8080
+// - 10.6.231.10:8080:8080/tcp
+func (builder *Builder) Port(port string) *Builder {
+	builder.ports = append(builder.ports, port)
+	return builder
+}
+
+// Ports defines a set port forwarding rules from the host machine to the
+// container
+// Examples:
+// - 8080:8080
+// - 10.6.231.10:8080:8080
+// - 10.6.231.10:8080:8080/tcp
+func (builder *Builder) Ports(ports []string) *Builder {
+	builder.ports = ports
+	return builder
+}
+
+// Pull the image if absent
+func (builder *Builder) Pull() *Builder {
+	builder.pull = true
+	return builder
+}
+
+// Start the container
+func (builder *Builder) Start(ctx context.Context) (string, error) {
+
+	// Pull container image if absent
+	if builder.pull {
+		err := builder.client.PullQuiet(ctx, builder.containerConfig.Image)
+		if err != nil {
+			return "", err
+		}
+	}
+
+	// Network: portbinding Host->Container
+	exposedPorts, portBindings, err := nat.ParsePortSpecs(builder.ports)
+	if err != nil {
+		return "", fmt.Errorf("unabel to parse ports: %w", err)
+	}
+	if len(portBindings) > 0 {
+		time.Sleep(1 * time.Second)
+		builder.containerConfig.ExposedPorts = exposedPorts
+		builder.hostConfig.PortBindings = portBindings
+	}
+
+	// Network: Add container to container networks
+	// Add the container to the first defined container network, if any one is
+	// defined. If no one is defined, the docker API will add the container to
+	// their default bridge docker0. The other networks will be added to the
+	// container after the container start.
+	var (
+		networkNames = make([]string, 0)
+		networks     = make([]types.NetworkResource, 0)
+	)
+	if len(builder.networks) > 0 {
+		for networkName := range builder.networks {
+			networkNames = append(networkNames, networkName)
+		}
+		var err error
+		networks, err = builder.client.NetworkListByNames(ctx, networkNames...)
+		if err != nil {
+			return "", err
+		}
+
+		endpointSetting := &network.EndpointSettings{
+			NetworkID: networks[0].ID,
+			Aliases:   builder.networks[networkNames[0]],
+		}
+
+		builder.networkConfig.EndpointsConfig[networkNames[0]] = endpointSetting
+
+		networkNames = networkNames[1:]
+		networks = networks[1:]
+	}
+
+	// Container: Create
+	resp, err := builder.client.ContainerCreate(
+		ctx,
+		builder.containerConfig,
+		builder.hostConfig,
+		builder.networkConfig,
+		builder.containerName,
+	)
+	if err != nil {
+		return "", fmt.Errorf("Unable to create container: %w", err)
+	}
+
+	err = builder.client.ContainerStart(ctx, resp.ID, types.ContainerStartOptions{})
+	if err != nil {
+
+		shutdownErr := builder.client.ContainerStopByIDs(ctx, 1*time.Second, resp.ID)
+		if shutdownErr != nil {
+			return "", fmt.Errorf("Unable to start container: %w\nUnable to remove container %s: %v\nManual cleanup necessary", err, resp.ID, shutdownErr)
+		}
+		return "", fmt.Errorf("Unable to start container: %w", err)
+	}
+
+	// Network: Add more container networks
+	for i, networkName := range networkNames {
+		endpointSetting := &network.EndpointSettings{
+			NetworkID: networks[i].ID,
+			Aliases:   builder.networks[networkName],
+		}
+		err := builder.client.NetworkConnect(ctx, networks[i].ID, resp.ID, endpointSetting)
+		if err != nil {
+			return "", fmt.Errorf("Unable to append container endpoint to network %v", networkName)
+		}
+	}
+
+	if builder.waitForHealthy {
+		watcher := builder.client.GetWatcher()
+		errors := make(chan error, 1)
+		done := make(chan struct{})
+		err = watcher.AddListener(resp.ID, errors, done)
+		if err != nil {
+			containerRemoveError := builder.client.ContainerRemove(ctx, resp.ID, types.ContainerRemoveOptions{Force: true})
+			if containerRemoveError != nil {
+				return "", fmt.Errorf("error while watching for container status: %w - unable to remove container: %v", err, containerRemoveError)
+			}
+			return "", fmt.Errorf("error while watching for container status: %w", err)
+		}
+
+		select {
+		case err := <-errors:
+			if err != nil {
+				containerRemoveError := builder.client.ContainerRemove(ctx, resp.ID, types.ContainerRemoveOptions{Force: true})
+				if containerRemoveError != nil {
+					return "", fmt.Errorf("%w - unable to remove container: %v", err, containerRemoveError)
+				}
+				return "", err
+			}
+		case <-done:
+
+		}
+	}
+
+	return resp.ID, err
+}
+
+// WaitForHealthy set the option to wait during the start process until the
+// container is healthy.
+func (builder *Builder) WaitForHealthy() *Builder {
+	builder.waitForHealthy = true
+	return builder
+}
+
+// WithName set the name of the container
+func (builder *Builder) WithName(containerName string) *Builder {
+	builder.containerName = containerName
+	return builder
+}
--- a/client.go
+++ b/client.go
@ -0,0 +1,402 @@
+package dockerutils
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/container"
+	"github.com/docker/docker/api/types/filters"
+	"github.com/docker/docker/api/types/network"
+	"github.com/docker/docker/api/types/volume"
+	"github.com/docker/docker/client"
+)
+
+// Client from the docker API with additional functions
+type Client struct {
+	*client.Client
+	watcher *Watcher
+	mutex   *sync.Mutex
+}
+
+// Close docker connection
+func (client *Client) Close() error {
+	client.mutex.Lock()
+	defer client.mutex.Unlock()
+	if client.watcher != nil {
+		client.watcher.stop()
+	}
+
+	return client.Client.Close()
+}
+
+// ContainerListByLabels returns only containers which match by given labels
+func (client *Client) ContainerListByLabels(ctx context.Context, all bool, containerLabels map[string]string) ([]types.Container, error) {
+	filterArgs := filters.NewArgs()
+	for key, value := range containerLabels {
+		filterArgs.Add("label", fmt.Sprintf("%v=%v", key, value))
+	}
+	containers, err := client.ContainerList(ctx, types.ContainerListOptions{
+		All:     all,
+		Filters: filterArgs,
+	})
+	if err != nil {
+		return nil, err
+	}
+	if containers == nil {
+		return nil, fmt.Errorf("No containers found by given labels")
+	}
+	return containers, nil
+}
+
+// ContainerListByNames returns only containers which match by given labels
+func (client *Client) ContainerListByNames(ctx context.Context, all bool, containerNames ...string) ([]types.Container, error) {
+	filterArgs := filters.NewArgs()
+	for _, name := range containerNames {
+		filterArgs.Add("name", name)
+	}
+	containers, err := client.ContainerList(ctx, types.ContainerListOptions{
+		All:     all,
+		Filters: filterArgs,
+	})
+	if err != nil {
+		return nil, err
+	}
+	if containers == nil {
+		return nil, fmt.Errorf("No containers found by given names")
+	}
+	return containers, nil
+}
+
+// ContainerRemoveByIDs deletes all containers which match by their container ids
+func (client *Client) ContainerRemoveByIDs(ctx context.Context, containerIDs ...string) error {
+	for _, containerID := range containerIDs {
+		err := client.ContainerRemove(ctx, containerID, types.ContainerRemoveOptions{Force: true})
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// ContainerRemoveByLabels deletes all containers which match by given labels
+func (client *Client) ContainerRemoveByLabels(ctx context.Context, containerLabels map[string]string) error {
+	containers, err := client.ContainerListByLabels(ctx, true, containerLabels)
+	if err != nil {
+		return err
+	}
+	for _, container := range containers {
+		err := client.ContainerRemove(ctx, container.ID, types.ContainerRemoveOptions{Force: true})
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// ContainerRemoveByNames deletes all containers which match by their names
+func (client *Client) ContainerRemoveByNames(ctx context.Context, containerNames ...string) error {
+	containers, err := client.ContainerListByNames(ctx, true, containerNames...)
+	if err != nil {
+		return err
+	}
+	for _, container := range containers {
+		err := client.ContainerRemove(ctx, container.ID, types.ContainerRemoveOptions{Force: true})
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// ContainerStopByIDs deletes all containers which match by their container ids
+func (client *Client) ContainerStopByIDs(ctx context.Context, timeout time.Duration, containerIDs ...string) error {
+	for _, containerID := range containerIDs {
+		err := client.ContainerStop(ctx, containerID, &timeout)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// ContainerStopByLabels shutdown containters which match by given labels
+func (client *Client) ContainerStopByLabels(ctx context.Context, timeout time.Duration, containerLabels map[string]string) error {
+	containers, err := client.ContainerListByLabels(ctx, true, containerLabels)
+	if err != nil {
+		return err
+	}
+	for _, container := range containers {
+		err := client.ContainerStop(ctx, container.ID, &timeout)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// ContainerStopByNames shutdown containters matching by their names
+func (client *Client) ContainerStopByNames(ctx context.Context, timeout time.Duration, containerNames ...string) error {
+	containers, err := client.ContainerListByNames(ctx, true, containerNames...)
+	if err != nil {
+		return err
+	}
+	for _, container := range containers {
+		err := client.ContainerStop(ctx, container.ID, &timeout)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// GetWatcher returns a watcher for container health states
+func (client *Client) GetWatcher() *Watcher {
+	if client.watcher != nil {
+		return client.watcher
+	}
+
+	client.mutex.Lock()
+	defer client.mutex.Unlock()
+
+	client.watcher = &Watcher{
+		client:        client,
+		errorChannels: make(map[string]chan<- error),
+		doneChannels:  make(map[string]chan<- struct{}),
+		errorMapper:   make(map[string]ErrorMapper),
+		mutex:         new(sync.RWMutex),
+	}
+
+	client.watcher.start()
+	return client.watcher
+}
+
+// NetworkListByLabels returns networks which match by given labels
+func (client *Client) NetworkListByLabels(ctx context.Context, networkLabels map[string]string) ([]types.NetworkResource, error) {
+	args := filters.NewArgs()
+	for key, value := range networkLabels {
+		args.Add("label", fmt.Sprintf("%v=%v", key, value))
+	}
+
+	return client.NetworkList(ctx, types.NetworkListOptions{
+		Filters: args,
+	})
+}
+
+// NetworkListByNames returns networks which match by their names. If a
+// network can not be found, the function returns an error
+func (client *Client) NetworkListByNames(ctx context.Context, networkNames ...string) ([]types.NetworkResource, error) {
+	networks, err := client.NetworkList(ctx, types.NetworkListOptions{})
+	if err != nil {
+		return nil, err
+	}
+
+	foundNetwork := make(map[string]bool, 0)
+	for _, networkName := range networkNames {
+		foundNetwork[networkName] = false
+	}
+
+	filteredNetworks := make([]types.NetworkResource, 0)
+	for _, networkName := range networkNames {
+		for _, network := range networks {
+			if network.Name == networkName {
+				filteredNetworks = append(filteredNetworks, network)
+				foundNetwork[networkName] = true
+			}
+		}
+	}
+
+	for _, networkName := range networkNames {
+		if !foundNetwork[networkName] {
+			return nil, fmt.Errorf("Network %v not found", networkName)
+		}
+	}
+
+	return filteredNetworks, nil
+}
+
+// NetworkRemoveByLabels remove all networks which match by given labels
+func (client *Client) NetworkRemoveByLabels(ctx context.Context, containerLabels map[string]string) error {
+	networks, err := client.NetworkListByLabels(ctx, containerLabels)
+	if err != nil {
+		return err
+	}
+
+	for _, network := range networks {
+		err := client.NetworkRemove(ctx, network.ID)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// NetworkRemoveByNames remove all networks match by their names. If a
+// network can not be found, the function returns an error
+func (client *Client) NetworkRemoveByNames(ctx context.Context, networkNames ...string) error {
+	networks, err := client.NetworkListByNames(ctx, networkNames...)
+	if err != nil {
+		return err
+	}
+
+	for _, network := range networks {
+		err := client.NetworkRemove(ctx, network.ID)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// NetworkRemoveByIDs remove all networks match by their id
+func (client *Client) NetworkRemoveByIDs(ctx context.Context, containerIDs ...string) error {
+	for _, containerID := range containerIDs {
+		err := client.NetworkRemove(ctx, containerID)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// NewBuilder returns a new builder for containers
+func (client *Client) NewBuilder(image string) *Builder {
+	return &Builder{
+		client: client,
+		containerConfig: &container.Config{
+			Image: image,
+		},
+		hostConfig: new(container.HostConfig),
+		networkConfig: &network.NetworkingConfig{
+			EndpointsConfig: make(map[string]*network.EndpointSettings, 0),
+		},
+		networks:       make(map[string][]string, 0),
+		ports:          make([]string, 0),
+		pull:           false,
+		waitForHealthy: false,
+	}
+}
+
+// Pull image
+func (client *Client) Pull(ctx context.Context, image string, w io.Writer) error {
+
+	parts := strings.Split(image, "/")
+	switch len(parts) {
+	case 1:
+		image = fmt.Sprintf("docker.io/library/%v", parts[0])
+	case 2:
+		if strings.Compare(parts[0], "library") == 0 ||
+			strings.Compare(parts[0], "docker.io") == 0 {
+			image = fmt.Sprintf("docker.io/library/%v", parts[1])
+		}
+	}
+
+	readCloser, err := client.ImagePull(ctx, image, types.ImagePullOptions{})
+	if err != nil {
+		return err
+	}
+
+	_, err = io.Copy(w, readCloser)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// PullQuiet image
+func (client *Client) PullQuiet(ctx context.Context, image string) error {
+	return client.Pull(ctx, image, ioutil.Discard)
+}
+
+// VolumeListByLabels returns volumes which match by given labels
+func (client *Client) VolumeListByLabels(ctx context.Context, volumeLabels map[string]string) (volume.VolumesListOKBody, error) {
+	args := filters.NewArgs()
+	for key, value := range volumeLabels {
+		args.Add("label", fmt.Sprintf("%v=%v", key, value))
+	}
+
+	return client.VolumeList(ctx, args)
+}
+
+// VolumeListByNames returns volumes which match by their names. If a
+// volume can not be found, the function returns an error
+func (client *Client) VolumeListByNames(ctx context.Context, volumeNames ...string) (volume.VolumesListOKBody, error) {
+	args := filters.NewArgs()
+	foundVolumes := make(map[string]bool, 0)
+	for _, volumeName := range volumeNames {
+		foundVolumes[volumeName] = false
+		args.Add("name", volumeName)
+	}
+
+	volumes, err := client.VolumeList(ctx, args)
+	if err != nil {
+		return volume.VolumesListOKBody{}, err
+	}
+
+	for _, volume := range volumes.Volumes {
+		foundVolumes[volume.Name] = true
+	}
+
+	for _, volumeName := range volumeNames {
+		if foundVolumes[volumeName] != true {
+			return volume.VolumesListOKBody{}, fmt.Errorf("Volume %v not found", volumeName)
+		}
+	}
+	return volumes, err
+}
+
+// VolumeRemoveByLabels remove all volumes match by their labels
+func (client *Client) VolumeRemoveByLabels(ctx context.Context, volumeLabels map[string]string) error {
+	volumes, err := client.VolumeListByLabels(ctx, volumeLabels)
+	if err != nil {
+		return err
+	}
+
+	for _, volume := range volumes.Volumes {
+		err := client.VolumeRemove(ctx, volume.Name, true)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// VolumeRemoveByNames remove all volumes match by their names. If a
+// volume can not be found, the function returns an error
+func (client *Client) VolumeRemoveByNames(ctx context.Context, volumeNames ...string) error {
+	volumes, err := client.VolumeListByNames(ctx, volumeNames...)
+	if err != nil {
+		return err
+	}
+
+	for _, volume := range volumes.Volumes {
+		err := client.VolumeRemove(ctx, volume.Name, true)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// New returns a new dockerutil client
+func New() (*Client, error) {
+	dockerClient, err := client.NewEnvClient()
+	if err != nil {
+		return nil, err
+	}
+	return &Client{
+		dockerClient,
+		nil,
+		new(sync.Mutex),
+	}, nil
+}
--- a/client_test.go
+++ b/client_test.go
@ -0,0 +1,443 @@
+package dockerutils
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"strings"
+	"testing"
+
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/volume"
+	uuid "github.com/satori/go.uuid"
+	"github.com/stretchr/testify/require"
+)
+
+// TestContainerCRUD
+// Test the following API functions:
+// - ContainerListByLabels
+// - ContainerListByNames
+// - ContainerRemoveByNames
+// - ContainerRemoveByLabels
+// - ContainerRemoveByIDs
+func TestContainerCRUD(t *testing.T) {
+	var (
+		ctx     = context.Background()
+		require = require.New(t)
+
+		iterations = 5
+
+		cleanupLabels = map[string]string{
+			uuid.NewV4().String(): uuid.NewV4().String(),
+		}
+	)
+
+	dockerClient, err := New()
+	require.NoError(err)
+	t.Cleanup(func() {
+		dockerClient.ContainerRemoveByLabels(ctx, cleanupLabels)
+	})
+
+	// Create Containers
+	containerIDs := make([]string, 0)
+	containerNames := make([]string, 0)
+	for i := 0; i < iterations; i++ {
+		containerName := uuid.NewV4().String()
+		containerID, err := dockerClient.NewBuilder("nginx:alpine").
+			Labels(cleanupLabels).
+			Port("80").
+			Pull().
+			WithName(containerName).
+			Start(ctx)
+		require.NoError(err)
+
+		containerNames = append(containerNames, containerName)
+		containerIDs = append(containerIDs, containerID)
+	}
+
+	// ListByLabels
+	containers, err := dockerClient.ContainerListByLabels(ctx, true, cleanupLabels)
+	require.NoError(err)
+	require.Len(containers, iterations)
+	for _, container := range containers {
+		require.Contains(containerIDs, container.ID)
+		require.Contains(containerNames, strings.Split(container.Names[0], "/")[1])
+	}
+
+	// ListByNames
+	containers, err = dockerClient.ContainerListByNames(ctx, true, containerNames...)
+	require.NoError(err)
+	require.Len(containers, iterations)
+	for _, container := range containers {
+		require.Contains(containerIDs, container.ID)
+		require.Contains(containerNames, strings.Split(container.Names[0], "/")[1])
+	}
+
+	// RemoveByLabels
+	err = dockerClient.ContainerRemoveByLabels(ctx, cleanupLabels)
+	require.NoError(err)
+
+	containers, err = dockerClient.ContainerListByLabels(ctx, true, cleanupLabels)
+	require.NoError(err)
+	require.Len(containers, 0)
+
+	// Create
+	containerIDs = make([]string, 0)
+	containerNames = make([]string, 0)
+	for i := 0; i < iterations; i++ {
+		containerName := uuid.NewV4().String()
+		containerID, err := dockerClient.NewBuilder("nginx:alpine").
+			Labels(cleanupLabels).
+			Port("80").
+			Pull().
+			WithName(containerName).
+			Start(ctx)
+		require.NoError(err)
+
+		containerNames = append(containerNames, containerName)
+		containerIDs = append(containerIDs, containerID)
+	}
+
+	// RemoveByNames
+	err = dockerClient.ContainerRemoveByNames(ctx, containerNames...)
+	require.NoError(err)
+
+	containers, err = dockerClient.ContainerListByNames(ctx, true, containerNames...)
+	require.NoError(err)
+	require.Len(containers, 0)
+
+	// Create
+	containerIDs = make([]string, 0)
+	containerNames = make([]string, 0)
+	for i := 0; i < iterations; i++ {
+		containerName := uuid.NewV4().String()
+		containerID, err := dockerClient.NewBuilder("nginx:alpine").
+			Labels(cleanupLabels).
+			Port("80").
+			Pull().
+			WithName(containerName).
+			Start(ctx)
+		require.NoError(err)
+
+		containerNames = append(containerNames, containerName)
+		containerIDs = append(containerIDs, containerID)
+	}
+
+	// RemoveByID
+	err = dockerClient.ContainerRemoveByIDs(ctx, containerIDs...)
+	require.NoError(err)
+
+	containers, err = dockerClient.ContainerListByLabels(ctx, true, cleanupLabels)
+	require.NoError(err)
+	require.Len(containers, 0)
+}
+
+// TestNetworkCRUD
+// Test the following API functions:
+// - NetworkListByLabels
+// - NetworkListByNames
+// - NetworkRemoveByLabels
+// - NetworkRemoveByNames
+// - NetworkRemoveByIDs
+func TestNetworkCRUD(t *testing.T) {
+	var (
+		ctx     = context.Background()
+		require = require.New(t)
+
+		iterations = 5
+
+		cleanupLabels = map[string]string{
+			uuid.NewV4().String(): uuid.NewV4().String(),
+		}
+	)
+
+	dockerClient, err := New()
+	require.NoError(err)
+	t.Cleanup(func() {
+		dockerClient.NetworkRemoveByLabels(ctx, cleanupLabels)
+	})
+
+	// Create Networks
+	networkIDs := make([]string, 0)
+	networkNames := make([]string, 0)
+	for i := 0; i < iterations; i++ {
+		networkName := uuid.NewV4().String()
+		resp, err := dockerClient.NetworkCreate(ctx, networkName, types.NetworkCreate{
+			Labels: cleanupLabels,
+		})
+		require.NoError(err)
+
+		networkNames = append(networkNames, networkName)
+		networkIDs = append(networkIDs, resp.ID)
+	}
+
+	// ListByLabels
+	networks, err := dockerClient.NetworkListByLabels(ctx, cleanupLabels)
+	require.NoError(err)
+	require.Len(networks, iterations)
+	for _, network := range networks {
+		require.Contains(networkIDs, network.ID)
+		require.Contains(networkNames, network.Name)
+	}
+
+	// ListByLabels, network with label does not exist
+	networks, err = dockerClient.NetworkListByLabels(ctx, map[string]string{uuid.NewV4().String(): uuid.NewV4().String()})
+	require.NoError(err)
+	require.Len(networks, 0)
+
+	// ListByNames
+	networks, err = dockerClient.NetworkListByNames(ctx, networkNames...)
+	require.NoError(err)
+	require.Len(networks, iterations)
+	for _, network := range networks {
+		require.Contains(networkIDs, network.ID)
+		require.Contains(networkNames, network.Name)
+	}
+
+	// ListByNames, network with names does not exist
+	networks, err = dockerClient.NetworkListByNames(ctx, uuid.NewV4().String(), uuid.NewV4().String())
+	require.Error(err)
+	require.Nil(networks)
+
+	// RemoveByLabels
+	err = dockerClient.NetworkRemoveByLabels(ctx, cleanupLabels)
+	require.NoError(err)
+
+	networks, err = dockerClient.NetworkListByLabels(ctx, cleanupLabels)
+	require.NoError(err)
+	require.Len(networks, 0)
+
+	// RemoveByLabels, label does not exists
+	err = dockerClient.NetworkRemoveByLabels(ctx, map[string]string{uuid.NewV4().String(): uuid.NewV4().String()})
+	require.NoError(err)
+
+	// Create Networks
+	networkIDs = make([]string, 0)
+	networkNames = make([]string, 0)
+	for i := 0; i < iterations; i++ {
+		networkName := uuid.NewV4().String()
+		resp, err := dockerClient.NetworkCreate(ctx, networkName, types.NetworkCreate{
+			Labels: cleanupLabels,
+		})
+		require.NoError(err)
+
+		networkNames = append(networkNames, networkName)
+		networkIDs = append(networkIDs, resp.ID)
+	}
+
+	// RemoveByNames
+	err = dockerClient.NetworkRemoveByNames(ctx, networkNames...)
+	require.NoError(err)
+
+	networks, err = dockerClient.NetworkListByNames(ctx, networkNames...)
+	require.Error(err)
+	require.Nil(networks)
+
+	// RemoveByNames, name does not exists
+	err = dockerClient.NetworkRemoveByNames(ctx, uuid.NewV4().String())
+	require.Error(err)
+
+	// Create Networks
+	networkIDs = make([]string, 0)
+	networkNames = make([]string, 0)
+	for i := 0; i < iterations; i++ {
+		networkName := uuid.NewV4().String()
+		resp, err := dockerClient.NetworkCreate(ctx, networkName, types.NetworkCreate{
+			Labels: cleanupLabels,
+		})
+		require.NoError(err)
+
+		networkNames = append(networkNames, networkName)
+		networkIDs = append(networkIDs, resp.ID)
+	}
+
+	// RemoveByIDs
+	err = dockerClient.NetworkRemoveByIDs(ctx, networkIDs...)
+	require.NoError(err)
+
+	networks, err = dockerClient.NetworkListByNames(ctx, networkNames...)
+	require.Error(err)
+	require.Nil(networks)
+
+	// RemoveByID, id does not exists
+	err = dockerClient.NetworkRemoveByIDs(ctx, uuid.NewV4().String())
+	require.Error(err)
+}
+
+func TestVolumeCRUD(t *testing.T) {
+	var (
+		ctx     = context.Background()
+		require = require.New(t)
+
+		iterations = 5
+
+		cleanupLabels = map[string]string{
+			uuid.NewV4().String(): uuid.NewV4().String(),
+		}
+	)
+
+	dockerClient, err := New()
+	require.NoError(err)
+	t.Cleanup(func() {
+		dockerClient.VolumeRemoveByLabels(ctx, cleanupLabels)
+	})
+
+	// Create Volumes
+	volumeNames := make([]string, 0)
+	for i := 0; i < iterations; i++ {
+		volumeName := uuid.NewV4().String()
+		volume, err := dockerClient.VolumeCreate(ctx, volume.VolumesCreateBody{
+			Name:   volumeName,
+			Labels: cleanupLabels,
+		})
+		require.NoError(err)
+
+		volumeNames = append(volumeNames, volume.Name)
+	}
+
+	// ListByLabels
+	volumes, err := dockerClient.VolumeListByLabels(ctx, cleanupLabels)
+	require.NoError(err)
+	require.Len(volumes.Volumes, iterations)
+	for _, volume := range volumes.Volumes {
+		require.Contains(volumeNames, volume.Name)
+	}
+
+	// ListByLabels, network with label does not exist
+	volumes, err = dockerClient.VolumeListByLabels(ctx, map[string]string{uuid.NewV4().String(): uuid.NewV4().String()})
+	require.NoError(err)
+	require.Len(volumes.Volumes, 0)
+
+	// ListByNames
+	volumes, err = dockerClient.VolumeListByNames(ctx, volumeNames...)
+	require.NoError(err)
+	require.Len(volumes.Volumes, iterations)
+	for _, volume := range volumes.Volumes {
+		require.Contains(volumeNames, volume.Name)
+	}
+
+	// ListByNames, network with names does not exist
+	volumes, err = dockerClient.VolumeListByNames(ctx, uuid.NewV4().String(), uuid.NewV4().String())
+	require.Error(err)
+	require.Nil(volumes.Volumes)
+
+	// RemoveByLabels
+	err = dockerClient.VolumeRemoveByLabels(ctx, cleanupLabels)
+	require.NoError(err)
+
+	volumes, err = dockerClient.VolumeListByLabels(ctx, cleanupLabels)
+	require.NoError(err)
+	require.Len(volumes.Volumes, 0)
+
+	// RemoveByLabels, labels does not exists
+	err = dockerClient.NetworkRemoveByLabels(ctx, map[string]string{uuid.NewV4().String(): uuid.NewV4().String()})
+	require.NoError(err)
+
+	// Create Volumes
+	volumeNames = make([]string, 0)
+	for i := 0; i < iterations; i++ {
+		volumeName := uuid.NewV4().String()
+		volume, err := dockerClient.VolumeCreate(ctx, volume.VolumesCreateBody{
+			Name:   volumeName,
+			Labels: cleanupLabels,
+		})
+		require.NoError(err)
+
+		volumeNames = append(volumeNames, volume.Name)
+	}
+
+	// RemoveByNames
+	err = dockerClient.VolumeRemoveByNames(ctx, volumeNames...)
+	require.NoError(err)
+
+	volumes, err = dockerClient.VolumeListByNames(ctx, volumeNames...)
+	require.Error(err)
+	require.Nil(volumes.Volumes)
+
+	// RemoveByNames, name does not exists
+	err = dockerClient.NetworkRemoveByNames(ctx, uuid.NewV4().String())
+	require.Error(err)
+}
+
+// TestContainerMultipleNetworks
+// Test if a container can be accessed over multiple networks/ips.
+func TestContainerMultipleNetworks(t *testing.T) {
+	var (
+		ctx     = context.Background()
+		require = require.New(t)
+
+		iterations = 5
+
+		cleanupLabels = map[string]string{
+			uuid.NewV4().String(): uuid.NewV4().String(),
+		}
+	)
+
+	dockerClient, err := New()
+	require.NoError(err)
+	t.Cleanup(func() {
+		dockerClient.ContainerRemoveByLabels(ctx, cleanupLabels)
+		dockerClient.NetworkRemoveByLabels(ctx, cleanupLabels)
+	})
+
+	// Create Containers
+	containerIDs := make([]string, 0)
+	containerNames := make([]string, 0)
+	containersNetworks := make(map[string]map[string][]string, 0)
+	for i := 0; i < iterations; i++ {
+		containerName := uuid.NewV4().String()
+
+		containerNetworks := map[string][]string{
+			uuid.NewV4().String(): {
+				uuid.NewV4().String(),
+				uuid.NewV4().String(),
+			},
+			uuid.NewV4().String(): {
+				uuid.NewV4().String(),
+				uuid.NewV4().String(),
+			},
+		}
+
+		builder := dockerClient.NewBuilder("nginx:alpine").
+			Labels(cleanupLabels).
+			Port("80").
+			Pull().
+			WithName(containerName)
+
+		for networkName, aliasses := range containerNetworks {
+			_, err := dockerClient.NetworkCreate(ctx, networkName, types.NetworkCreate{
+				Labels: cleanupLabels,
+			})
+			require.NoError(err)
+
+			builder.Network(networkName, aliasses...)
+		}
+
+		containerID, err := builder.Start(ctx)
+		require.NoError(err)
+
+		containerNames = append(containerNames, containerName)
+		containerIDs = append(containerIDs, containerID)
+		containersNetworks[containerID] = containerNetworks
+	}
+
+	for containerID, containerNetworks := range containersNetworks {
+		for networkName := range containerNetworks {
+			networks, err := dockerClient.NetworkListByNames(ctx, networkName)
+			require.NoError(err)
+			for _, network := range networks {
+				if _, present := network.Containers[containerID]; !present {
+					require.Fail("Container %v not found in network %v", containerID, network.ID)
+				}
+
+				networkIPParts := strings.Split(network.Containers[containerID].IPv4Address, "/")
+
+				url := fmt.Sprintf("http://%v", networkIPParts[0])
+				resp, err := http.Get(url)
+				require.NoError(err)
+				defer resp.Body.Close()
+				require.Equal(http.StatusOK, resp.StatusCode)
+			}
+		}
+	}
+}
--- a/go.mod
+++ b/go.mod
@ -0,0 +1,15 @@
+module git.cryptic.systems/volker.raschek/dockerutils
+
+go 1.15
+
+require (
+	github.com/docker/distribution v2.7.1+incompatible // indirect
+	github.com/docker/docker v1.13.1
+	github.com/docker/go-connections v0.4.0
+	github.com/docker/go-units v0.4.0 // indirect
+	github.com/opencontainers/go-digest v1.0.0 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/satori/go.uuid v1.2.0
+	github.com/stretchr/testify v1.6.1
+	golang.org/x/net v0.0.0-20201031054903-ff519b6c9102 // indirect
+)
--- a/go.sum
+++ b/go.sum
@ -0,0 +1,35 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/docker/distribution v2.7.1+incompatible h1:a5mlkVzth6W5A4fOsS3D2EO5BUmsJpcB+cRlLU7cSug=
+github.com/docker/distribution v2.7.1+incompatible/go.mod h1:J2gT2udsDAN96Uj4KfcMRqY0/ypR+oyYUYmja8H+y+w=
+github.com/docker/docker v1.13.1 h1:IkZjBSIc8hBjLpqeAbeE5mca5mNgeatLHBy3GO78BWo=
+github.com/docker/docker v1.13.1/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
+github.com/docker/go-connections v0.4.0 h1:El9xVISelRB7BuFusrZozjnkIM5YnzCViNKohAFqRJQ=
+github.com/docker/go-connections v0.4.0/go.mod h1:Gbd7IOopHjR8Iph03tsViu4nIes5XhDvyHbTtUxmeec=
+github.com/docker/go-units v0.4.0 h1:3uh0PgVws3nIA0Q+MwDC8yjEPf9zjRfZZWXZYDct3Tw=
+github.com/docker/go-units v0.4.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
+github.com/opencontainers/go-digest v1.0.0 h1:apOUWs51W5PlhuyGyz9FCeeBIOUDA/6nW8Oi/yOhh5U=
+github.com/opencontainers/go-digest v1.0.0/go.mod h1:0JzlMkj0TRzQZfJkVvzbP0HBR3IKzErnv2BNG4W4MAM=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/satori/go.uuid v1.2.0 h1:0uYX9dsZ2yD7q2RtLRtPSdGDWzjeM3TbMJP9utgA0ww=
+github.com/satori/go.uuid v1.2.0/go.mod h1:dA0hQrYB0VpLJoorglMZABFdXlWrHn1NEOzdhQKdks0=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
+github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20201031054903-ff519b6c9102 h1:42cLlJJdEh+ySyeUUbEQ5bsTiq8voBeTuweGVkY6Puw=
+golang.org/x/net v0.0.0-20201031054903-ff519b6c9102/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
--- a/watcher.go
+++ b/watcher.go
@ -0,0 +1,166 @@
+package dockerutils
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"sync"
+	"time"
+
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/events"
+)
+
+var (
+	ErrDied      = errors.New("died")
+	ErrUnhealthy = errors.New("went unhealthy")
+)
+
+// Watcher is a helper to listen on docker API events to notify if a container
+// is healthy or not.
+type Watcher struct {
+	client        *Client
+	errorChannels map[string]chan<- error
+	doneChannels  map[string]chan<- struct{}
+	errorMapper   map[string]ErrorMapper
+	mutex         *sync.RWMutex
+	lastError     error
+	cancelFunc    context.CancelFunc
+}
+
+func (watcher *Watcher) AddListenerWithErrorMapper(containerID string, errorChannel chan<- error, doneChannel chan<- struct{}, errorMapper ErrorMapper) error {
+	watcher.mutex.Lock()
+	defer watcher.mutex.Unlock()
+
+	if watcher.lastError != nil {
+		return watcher.lastError
+	}
+
+	ctx, cancel := context.WithDeadline(context.Background(), time.Now().Add(20*time.Second))
+	defer cancel()
+
+	containerJSON, err := watcher.client.ContainerInspect(ctx, containerID)
+	if err != nil {
+		return fmt.Errorf("Unable to check if container is already unhealthy: %w", err)
+	}
+
+	if containerJSON.State.Dead || !containerJSON.State.Running {
+		go func() {
+			errorChannel <- errorMapper(fmt.Errorf("Container %v: %w", containerID, ErrDied))
+			doneChannel <- struct{}{}
+		}()
+		return nil
+	}
+
+	if containerJSON.State.Health == nil {
+		go func() {
+			doneChannel <- struct{}{}
+		}()
+		return nil
+	}
+
+	switch containerJSON.State.Health.Status {
+	case "starting":
+		watcher.errorChannels[containerID] = errorChannel
+		watcher.doneChannels[containerID] = doneChannel
+		watcher.errorMapper[containerID] = errorMapper
+	case "healthy":
+		go func() {
+			doneChannel <- struct{}{}
+		}()
+	case "unhealthy":
+		go func() {
+			errorChannel <- errorMapper(fmt.Errorf("Container %v: %w", containerID, ErrUnhealthy))
+			doneChannel <- struct{}{}
+		}()
+	default:
+		go func() {
+			errorChannel <- errorMapper(fmt.Errorf("Container %v went in an unknown state during startup: %s", containerID, containerJSON.State.Health.Status))
+			doneChannel <- struct{}{}
+		}()
+	}
+	return nil
+}
+
+func (watcher *Watcher) AddListener(containerID string, errorChannel chan<- error, doneChannel chan<- struct{}) error {
+	return watcher.AddListenerWithErrorMapper(containerID, errorChannel, doneChannel, defaultErrorMapper)
+}
+
+func (watcher *Watcher) removeListener(containerID string) {
+	watcher.mutex.Lock()
+	defer watcher.mutex.Unlock()
+	delete(watcher.doneChannels, containerID)
+	delete(watcher.errorChannels, containerID)
+	delete(watcher.errorMapper, containerID)
+}
+
+func (watcher *Watcher) start() {
+	ctx, cancel := context.WithCancel(context.Background())
+	watcher.cancelFunc = cancel
+	dockerEvents, errors := watcher.client.Events(ctx, types.EventsOptions{})
+
+	sendErrorFunc := func() {
+		watcher.mutex.Lock()
+		for containerID, errorChannel := range watcher.errorChannels {
+			go func(errorChannel chan<- error, doneChannel chan<- struct{}, err error, errorMapper ErrorMapper) {
+				errorChannel <- errorMapper(err)
+				doneChannel <- struct{}{}
+			}(errorChannel, watcher.doneChannels[containerID], watcher.lastError, watcher.errorMapper[containerID])
+		}
+		watcher.mutex.Unlock()
+	}
+
+	go func() {
+		for {
+			select {
+			case event := <-dockerEvents:
+				watcher.mutex.RLock()
+				errorChannel, present := watcher.errorChannels[event.Actor.ID]
+				if !present || event.Type != events.ContainerEventType {
+					continue
+				}
+				doneChannel := watcher.doneChannels[event.Actor.ID]
+				errorMapper := watcher.errorMapper[event.Actor.ID]
+				watcher.mutex.RUnlock()
+
+				switch event.Action {
+				case "health_status: healthy":
+					go func() {
+						doneChannel <- struct{}{}
+					}()
+					watcher.removeListener(event.Actor.ID)
+				case "health_status: unhealthy":
+					go func() {
+						errorChannel <- errorMapper(fmt.Errorf("Container %v: %w", event.Actor.ID, ErrUnhealthy))
+						doneChannel <- struct{}{}
+					}()
+					watcher.removeListener(event.Actor.ID)
+				case "die":
+					go func() {
+						errorChannel <- errorMapper(fmt.Errorf("Container %v: %w", event.Actor.ID, ErrDied))
+						doneChannel <- struct{}{}
+					}()
+					watcher.removeListener(event.Actor.ID)
+				}
+			case err := <-errors:
+				watcher.lastError = err
+				sendErrorFunc()
+				return
+			case <-ctx.Done():
+				watcher.lastError = fmt.Errorf("Watcher was canceled")
+				sendErrorFunc()
+				return
+			}
+		}
+	}()
+}
+
+func (watcher *Watcher) stop() {
+	watcher.cancelFunc()
+}
+
+type ErrorMapper func(error) error
+
+func defaultErrorMapper(err error) error {
+	return err
+}