testcontainers

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 Go to latest Published: Dec 17, 2019 License: MIT Imports: 23 Imported by: 0

README

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When I was working on a Zipkin PR I discovered a nice Java library called testcontainers.

It provides an easy and clean API over the go docker sdk to run, terminate and connect to containers in your tests.

I found myself comfortable programmatically writing the containers I need to run an integration/smoke tests. So I started porting this library in Go.

This is the API I have defined:

package main

import (
	"context"
	"fmt"
	"net/http"
	"testing"

	"github.com/testcontainers/testcontainers-go"
	"github.com/testcontainers/testcontainers-go/wait"
)

func TestNginxLatestReturn(t *testing.T) {
	ctx := context.Background()
	req := testcontainers.ContainerRequest{
		Image:        "nginx",
		ExposedPorts: []string{"80/tcp"},
		WaitingFor:   wait.ForHTTP("/"),
	}
	nginxC, err := testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{
		ContainerRequest: req,
		Started:          true,
	})
	if err != nil {
		t.Error(err)
	}
	defer nginxC.Terminate(ctx)
	ip, err := nginxC.Host(ctx)
	if err != nil {
		t.Error(err)
	}
	port, err := nginxC.MappedPort(ctx, "80")
	if err != nil {
		t.Error(err)
	}
	resp, err := http.Get(fmt.Sprintf("http://%s:%s", ip, port.Port()))
	if resp.StatusCode != http.StatusOK {
		t.Errorf("Expected status code %d. Got %d.", http.StatusOK, resp.StatusCode)
	}
}

This is a simple example, you can create one container in my case using the nginx image. You can get its IP ip, err := nginxC.GetContainerIpAddress(ctx) and you can use it to make a GET: resp, err := http.Get(fmt.Sprintf("http://%s", ip))

To clean your environment you can defer the container termination defer nginxC.Terminate(ctx, t). t is *testing.T and it is used to notify is the defer failed marking the test as failed.

Build from Dockerfile

Testcontainers-go gives you the ability to build and image and run a container from a Dockerfile.

You can do so by specifiying a Context (the filepath to the build context on your local filesystem) and optionally a Dockerfile (defaults to "Dockerfile") like so:

req := ContainerRequest{
		FromDockerfile: testcontainers.FromDockerfile{
			Context: "/path/to/build/context",
			Dockerfile: "CustomDockerfile",
		},
	}

Dynamic Build Context

If you would like to send a build context that you created in code (maybe you have a dynamic Dockerfile), you can send the build context as an io.Reader since the Docker Daemon accepts is as a tar file, you can use the tar package to create your context.

To do this you would use the ContextArchive attribute in the FromDockerfile struct.

var buf bytes.Buffer
tarWriter := tar.NewWriter(&buf)
// ... add some files
if err := tarWriter.Close(); err != nil {
	// do something with err
}
reader := bytes.NewReader(buf.Bytes())
fromDockerfile := testcontainers.FromDockerfile{
	ContextArchive: reader,
}

Please Note if you specify a ContextArchive this will cause testcontainers to ignore the path passed in to Context

Sending a CMD to a Container

If you would like to send a CMD (command) to a container, you can pass it in to the container request via the Cmd field...

req := ContainerRequest{
	Image: "alpine",
	WaitingFor: wait.ForAll(
		wait.ForLog("command override!"),
	),
	Cmd: []string{"echo", "command override!"},
}

Documentation

Index

Examples

Constants

View Source 
const (
	TestcontainerLabel          = "org.testcontainers.golang"
	TestcontainerLabelSessionID = TestcontainerLabel + ".sessionId"
	TestcontainerLabelIsReaper  = TestcontainerLabel + ".reaper"

	ReaperDefaultImage = "quay.io/testcontainers/ryuk:0.2.2"
)

Variables

This section is empty.

Functions

This section is empty.

Types

type Container 

type Container interface {
	GetContainerID() string                                         // get the container id from the provider
	Endpoint(context.Context, string) (string, error)               // get proto://ip:port string for the first exposed port
	PortEndpoint(context.Context, nat.Port, string) (string, error) // get proto://ip:port string for the given exposed port
	Host(context.Context) (string, error)                           // get host where the container port is exposed
	MappedPort(context.Context, nat.Port) (nat.Port, error)         // get externally mapped port for a container port
	Ports(context.Context) (nat.PortMap, error)                     // get all exposed ports
	SessionID() string                                              // get session id
	Start(context.Context) error                                    // start the container
	Terminate(context.Context) error                                // terminate the container
	Logs(context.Context) (io.ReadCloser, error)                    // Get logs of the container
	Name(context.Context) (string, error)                           // get container name
	Networks(context.Context) ([]string, error)                     // get container networks
	NetworkAliases(context.Context) (map[string][]string, error)    // get container network aliases for a network
	Exec(ctx context.Context, cmd []string) (int, error)
}

Container allows getting info about and controlling a single container instance

func GenericContainer 

func GenericContainer(ctx context.Context, req GenericContainerRequest) (Container, error)

GenericContainer creates a generic container with parameters

type ContainerProvider 

type ContainerProvider interface {
	CreateContainer(context.Context, ContainerRequest) (Container, error) // create a container without starting it
	RunContainer(context.Context, ContainerRequest) (Container, error)    // create a container and start it
}

ContainerProvider allows the creation of containers on an arbitrary system

type ContainerRequest 

type ContainerRequest struct {
	FromDockerfile
	Image          string
	Env            map[string]string
	ExposedPorts   []string // allow specifying protocol info
	Cmd            []string
	Labels         map[string]string
	BindMounts     map[string]string
	RegistryCred   string
	WaitingFor     wait.Strategy
	Name           string              // for specifying container name
	Privileged     bool                // for starting privileged container
	Networks       []string            // for specifying network names
	NetworkAliases map[string][]string // for specifying network aliases
	SkipReaper     bool                // indicates whether we skip setting up a reaper for this
	ReaperImage    string              // alternative reaper image
}

ContainerRequest represents the parameters used to get a running container

func (*ContainerRequest) GetContext 

func (c *ContainerRequest) GetContext() (io.Reader, error)

GetContext retrieve the build context for the request

func (*ContainerRequest) GetDockerfile 

func (c *ContainerRequest) GetDockerfile() string

GetDockerfile returns the Dockerfile from the ContainerRequest, defaults to "Dockerfile"

func (*ContainerRequest) ShouldBuildImage 

func (c *ContainerRequest) ShouldBuildImage() bool

func (*ContainerRequest) Validate 

func (c *ContainerRequest) Validate() error

Validate ensures that the ContainerRequest does not have invalid paramters configured to it ex. make sure you are not specifying both an image as well as a context

type DeprecatedContainer 

type DeprecatedContainer interface {
	GetHostEndpoint(ctx context.Context, port string) (string, string, error)
	GetIPAddress(ctx context.Context) (string, error)
	LivenessCheckPorts(ctx context.Context) (nat.PortSet, error)
	Terminate(ctx context.Context) error
}

DeprecatedContainer shows methods that were supported before, but are now deprecated Deprecated: Use Container

type DockerContainer 

type DockerContainer struct {
	// Container ID from Docker
	ID         string
	WaitingFor wait.Strategy
	// contains filtered or unexported fields
}

DockerContainer represents a container started using Docker

func (*DockerContainer) Endpoint 

func (c *DockerContainer) Endpoint(ctx context.Context, proto string) (string, error)

Endpoint gets proto://host:port string for the first exposed port Will returns just host:port if proto is ""

func (*DockerContainer) Exec 

func (c *DockerContainer) Exec(ctx context.Context, cmd []string) (int, error)

func (*DockerContainer) GetContainerID 

func (c *DockerContainer) GetContainerID() string

func (*DockerContainer) Host 

func (c *DockerContainer) Host(ctx context.Context) (string, error)

Host gets host (ip or name) of the docker daemon where the container port is exposed Warning: this is based on your Docker host setting. Will fail if using an SSH tunnel You can use the "TC_HOST" env variable to set this yourself

func (*DockerContainer) Logs 

func (c *DockerContainer) Logs(ctx context.Context) (io.ReadCloser, error)

Logs will fetch both STDOUT and STDERR from the current container. Returns a ReadCloser and leaves it up to the caller to extract what it wants.

func (*DockerContainer) MappedPort 

func (c *DockerContainer) MappedPort(ctx context.Context, port nat.Port) (nat.Port, error)

MappedPort gets externally mapped port for a container port

func (*DockerContainer) Name 

func (c *DockerContainer) Name(ctx context.Context) (string, error)

Name gets the name of the container.

func (*DockerContainer) NetworkAliases 

func (c *DockerContainer) NetworkAliases(ctx context.Context) (map[string][]string, error)

NetworkAliases gets the aliases of the container for the networks it is attached to.

func (*DockerContainer) Networks 

func (c *DockerContainer) Networks(ctx context.Context) ([]string, error)

Networks gets the names of the networks the container is attached to.

func (*DockerContainer) PortEndpoint 

func (c *DockerContainer) PortEndpoint(ctx context.Context, port nat.Port, proto string) (string, error)

PortEndpoint gets proto://host:port string for the given exposed port Will returns just host:port if proto is ""

func (*DockerContainer) Ports 

func (c *DockerContainer) Ports(ctx context.Context) (nat.PortMap, error)

Ports gets the exposed ports for the container.

func (*DockerContainer) SessionID 

func (c *DockerContainer) SessionID() string

SessionID gets the current session id

func (*DockerContainer) Start 

func (c *DockerContainer) Start(ctx context.Context) error

Start will start an already created container

func (*DockerContainer) Terminate 

func (c *DockerContainer) Terminate(ctx context.Context) error

Terminate is used to kill the container. It is usally triggered by as defer function.

type DockerNetwork 

type DockerNetwork struct {
	ID     string // Network ID from Docker
	Driver string
	Name   string
	// contains filtered or unexported fields
}

DockerNetwork represents a network started using Docker

func (*DockerNetwork) Remove 

func (n *DockerNetwork) Remove(_ context.Context) error

Remove is used to remove the network. It is usually triggered by as defer function.

type DockerProvider 

type DockerProvider struct {
	// contains filtered or unexported fields
}

DockerProvider implements the ContainerProvider interface

func NewDockerProvider 

func NewDockerProvider() (*DockerProvider, error)

NewDockerProvider creates a Docker provider with the EnvClient

func (*DockerProvider) BuildImage 

func (p *DockerProvider) BuildImage(ctx context.Context, img ImageBuildInfo) (string, error)

BuildImage will build and image from context and Dockerfile, then return the tag

func (*DockerProvider) CreateContainer 

func (p *DockerProvider) CreateContainer(ctx context.Context, req ContainerRequest) (Container, error)

CreateContainer fulfills a request for a container without starting it

Example 
ctx := context.Background()
req := ContainerRequest{
	Image:        "nginx",
	ExposedPorts: []string{"80/tcp"},
	WaitingFor:   wait.ForHTTP("/"),
}
nginxC, _ := GenericContainer(ctx, GenericContainerRequest{
	ContainerRequest: req,
	Started:          true,
})
defer nginxC.Terminate(ctx)

Output:

func (*DockerProvider) CreateNetwork 

func (p *DockerProvider) CreateNetwork(ctx context.Context, req NetworkRequest) (Network, error)

CreateNetwork returns the object representing a new network identified by its name

func (*DockerProvider) GetNetwork 

func (p *DockerProvider) GetNetwork(ctx context.Context, req NetworkRequest) (types.NetworkResource, error)

GetNetwork returns the object representing the network identified by its name

func (*DockerProvider) RunContainer 

func (p *DockerProvider) RunContainer(ctx context.Context, req ContainerRequest) (Container, error)

RunContainer takes a RequestContainer as input and it runs a container via the docker sdk

type FromDockerfile 

type FromDockerfile struct {
	Context        string    // the path to the context of of the docker build
	ContextArchive io.Reader // the tar archive file to send to docker that contains the build context
	Dockerfile     string    // the path from the context to the Dockerfile for the image, defaults to "Dockerfile"
}

FromDockerfile represents the parameters needed to build an image from a Dockerfile rather than using a pre-built one

type GenericContainerRequest 

type GenericContainerRequest struct {
	ContainerRequest              // embedded request for provider
	Started          bool         // whether to auto-start the container
	ProviderType     ProviderType // which provider to use, Docker if empty
}

GenericContainerRequest represents parameters to a generic container

type GenericProvider 

type GenericProvider interface {
	ContainerProvider
	NetworkProvider
}

GenericProvider represents an abstraction for container and network providers

type ImageBuildInfo 

type ImageBuildInfo interface {
	GetContext() (io.Reader, error) // the path to the build context
	GetDockerfile() string          // the relative path to the Dockerfile, including the fileitself
	ShouldBuildImage() bool         // return true if the image needs to be built
}

ImageBuildInfo defines what is needed to build an image

type Network 

type Network interface {
	Remove(context.Context) error // removes the network
}

Network allows getting info about a single network instance

type NetworkProvider 

type NetworkProvider interface {
	CreateNetwork(context.Context, NetworkRequest) (Network, error)            // create a network
	GetNetwork(context.Context, NetworkRequest) (types.NetworkResource, error) // get a network
}

NetworkProvider allows the creation of networks on an arbitrary system

type NetworkRequest 

type NetworkRequest struct {
	Driver         string
	CheckDuplicate bool
	Internal       bool
	EnableIPv6     bool
	Name           string
	Labels         map[string]string
	Attachable     bool

	SkipReaper  bool   // indicates whether we skip setting up a reaper for this
	ReaperImage string //alternative reaper registry
}

NetworkRequest represents the parameters used to get a network

type ProviderType 

type ProviderType int

ProviderType is an enum for the possible providers 

const (
	ProviderDocker ProviderType = iota // Docker is default = 0
)

possible provider types

func (ProviderType) GetProvider 

func (t ProviderType) GetProvider() (GenericProvider, error)

GetProvider provides the provider implementation for a certain type

type Reaper 

type Reaper struct {
	Provider  ReaperProvider
	SessionID string
	Endpoint  string
}

Reaper is used to start a sidecar container that cleans up resources

func NewReaper 

func NewReaper(ctx context.Context, sessionID string, provider ReaperProvider, reaperImageName string) (*Reaper, error)

NewReaper creates a Reaper with a sessionID to identify containers and a provider to use

func (*Reaper) Connect 

func (r *Reaper) Connect() (chan bool, error)

Connect runs a goroutine which can be terminated by sending true into the returned channel

func (*Reaper) Labels 

func (r *Reaper) Labels() map[string]string

Labels returns the container labels to use so that this Reaper cleans them up

type ReaperProvider 

type ReaperProvider interface {
	RunContainer(ctx context.Context, req ContainerRequest) (Container, error)
}

ReaperProvider represents a provider for the reaper to run itself with The ContainerProvider interface should usually satisfy this as well, so it is pluggable

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