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How to use Logs method of testcontainers Package

Best Testcontainers-go code snippet using testcontainers.Logs

e2e_test.go

Source:e2e_test.go

...112			ContainerRequest: jaegerReq,113		})114		require.NoError(t, err)115		defer func() {116			logs, errLogs := jaegerContainer.Logs(ctx)117			require.NoError(t, errLogs)118			all, errLogs := ioutil.ReadAll(logs)119			require.NoError(t, errLogs)120			fmt.Printf("Jaeger logs:\n---->\n%s<----\n\n", string(all))121			jaegerContainer.Terminate(ctx)122		}()123		err = jaegerContainer.Start(ctx)124		require.NoError(t, err)125		jaegerContainers = append(jaegerContainers, jaegerContainer)126	}127	for _, jaegerContainer := range jaegerContainers {128		jaegerQueryPort, err := jaegerContainer.MappedPort(ctx, jaegerQueryPort)129		require.NoError(t, err)130		err = awaitility.Await(100*time.Millisecond, time.Second*3, func() bool {131			// Jaeger traces itself so this request generates some spans132			response, errHTTP := http.Get(fmt.Sprintf("http://localhost:%d/api/services", jaegerQueryPort.Int()))133			require.NoError(t, errHTTP)...

main_test.go

Source:main_test.go

...55	t.Run("Container can start", func(t *testing.T) {56		if err != nil {57			t.Fatalf("[Container creation] %s: %v", w, err)58		}59		logs, err := redisC.Logs(ctx)60		if err != nil {61			t.Fatalf("Logs: %s: %v", w, err)62		}63		bytes, err := io.ReadAll(logs)64		if err != nil {65			t.Fatalf("%s: %v", w, err)66		}67		t.Logf("Container logs: \n%s", string(bytes))68		if redisC.GetContainerID() == "" {69			t.Error("Container ID is empty, something went wrong starting the redis container")70		}71	})72	t.Run("Connected to Testcontainers Cloud", func(t *testing.T) {73		if err != nil {74			t.Skip("Container can't be started, seems there is an issue connecting to Testcontainers Cloud")75		}...

container.go

Source:container.go

...25	Image        string26	Name         string27	Address      string28	ExposedPorts []string29	Logs         TestLogConsumer30	Networks     []string31	Entrypoint   []string32}33func (c *Container) Start() error {34	c.ctx = context.Background()35	containerMounts := make([]testcontainers.ContainerMount, 0, len(c.BindMounts))36	for k, v := range c.BindMounts {37		containerMounts = append(containerMounts, testcontainers.BindMount(v, testcontainers.ContainerMountTarget(k)))38	}39	req := testcontainers.GenericContainerRequest{40		ContainerRequest: testcontainers.ContainerRequest{41			Mounts:       testcontainers.Mounts(containerMounts...),42			Entrypoint:   c.Entrypoint,43			Env:          c.Env,44			ExposedPorts: c.ExposedPorts,45			Image:        c.Image,46			Name:         c.Name,47			Networks:     c.Networks,48			WaitingFor:   c.WaitingFor,49		},50		Started: true,51	}52	container, err := testcontainers.GenericContainer(c.ctx, req)53	if err != nil {54		return fmt.Errorf("container failed to start: %w", err)55	}56	c.container = container57	c.Logs = TestLogConsumer{58		Msgs: []string{},59	}60	c.container.FollowOutput(&c.Logs)61	err = c.container.StartLogProducer(c.ctx)62	if err != nil {63		return fmt.Errorf("log producer failed: %w", err)64	}65	c.Address = "localhost"66	err = c.LookupMappedPorts()67	if err != nil {68		_ = c.Terminate()69		return fmt.Errorf("port lookup failed: %w", err)70	}71	return nil72}73// create a lookup table of exposed ports to mapped ports74func (c *Container) LookupMappedPorts() error {75	if len(c.ExposedPorts) == 0 {76		return nil77	}78	if len(c.Ports) == 0 {79		c.Ports = make(map[string]string)80	}81	for _, port := range c.ExposedPorts {82		// strip off leading host port: 80:8080 -> 808083		if strings.Contains(port, ":") {84			port = strings.Split(port, ":")[1]85		}86		// strip off the transport: 80/tcp -> 8087		if strings.Contains(port, "/") {88			port = strings.Split(port, "/")[0]89		}90		p, err := c.container.MappedPort(c.ctx, nat.Port(port))91		if err != nil {92			return fmt.Errorf("failed to find '%s' - %w", port, err)93		}94		fmt.Printf("mapped container port '%s' to host port '%s'\n", port, p.Port())95		c.Ports[port] = p.Port()96	}97	return nil98}99func (c *Container) Exec(cmds []string) (int, error) {100	return c.container.Exec(c.ctx, cmds)101}102func (c *Container) PrintLogs() {103	fmt.Println("--- Container Logs Start ---")104	for _, msg := range c.Logs.Msgs {105		fmt.Print(msg)106	}107	fmt.Println("--- Container Logs End ---")108}109func (c *Container) Terminate() error {110	err := c.container.StopLogProducer()111	if err != nil {112		fmt.Println(err)113	}114	err = c.container.Terminate(c.ctx)115	if err != nil {116		fmt.Printf("failed to terminate the container: %s", err)117	}118	c.PrintLogs()119	return nil120}...

Logs

Using AI Code Generation

1import (2func main() {3	ctx := context.Background()4	req := testcontainers.ContainerRequest{5		ExposedPorts: []string{"80/tcp"},6		Cmd:          []string{"sh", "-c", "while true; do echo hello world; sleep 1; done"},7		WaitingFor:   wait.ForLog("hello world"),8	}9	c, err := testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{10	})11	if err != nil {12		log.Fatal(err)13	}14	defer c.Terminate(ctx)15	logs, err := c.Logs(ctx)16	if err != nil {17		log.Fatal(err)18	}19	fmt.Println(logs)20}

Logs

Using AI Code Generation

1import (2func main() {3    ctx := context.Background()4    req := testcontainers.ContainerRequest{5        ExposedPorts: []string{"6379/tcp"},6        WaitingFor:   wait.ForLog("Ready to accept connections"),7    }8    redis, err := testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{9    })10    if err != nil {11        panic(err)12    }13    defer redis.Terminate(ctx)14    ip, err := redis.Host(ctx)15    if err != nil {16        panic(err)17    }18    port, err := redis.MappedPort(ctx, "6379/tcp")19    if err != nil {20        panic(err)21    }22    log.Printf("Redis container is ready to accept connections at %s:%s", ip, port.Port())23}

Logs

Using AI Code Generation

1import (2func main() {3	ctx := context.Background()4	req := testcontainers.ContainerRequest{5		Cmd:          []string{"echo", "hello world"},6		ExposedPorts: []string{"80/tcp"},7		WaitingFor:   wait.ForLog("hello world"),8	}9	container, err := testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{10	})11	if err != nil {12		panic(err)13	}14	defer container.Terminate(ctx)15	logs, err := container.Logs(ctx)16	if err != nil {17		panic(err)18	}19	fmt.Println(logs)20	logsAsString, err := container.LogsToString(ctx)21	if err != nil {22		panic(err)23	}24	fmt.Println(logsAsString)25}

Logs

Using AI Code Generation

1import (2func main() {3	ctx := context.Background()4	req := testcontainers.ContainerRequest{5		Cmd:          []string{"sh", "-c", "while true; do date; sleep 1; done"},6		ExposedPorts: []string{"80/tcp"},7		WaitingFor:   wait.ForLog("date"),8	}9	container, err := testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{10	})11	if err != nil {12		log.Fatal(err)13	}14	id, err := container.ContainerID(ctx)15	if err != nil {16		log.Fatal(err)17	}18	fmt.Println(id)19	host, err := container.Host(ctx)20	if err != nil {21		log.Fatal(err)22	}23	fmt.Println(host)24	mappedPort, err := container.MappedPort(ctx, "80")25	if err != nil {26		log.Fatal(err)27	}28	fmt.Println(mappedPort.Int())29	exitCode, err := container.Exec(ctx, []string{"echo", "hello world"})30	if err != nil {31		log.Fatal(err)32	}33	fmt.Println(exitCode)34	err = container.CopyFileToContainer(ctx, "/tmp/file.txt", "/file.txt")35	if err != nil {36		log.Fatal(err)37	}38	logs, err := container.Logs(ctx)39	if err != nil {40		log.Fatal(err)41	}42	defer logs.Close()43	logsFile, err := os.Create("/tmp/logs.txt")44	if err != nil {45		log.Fatal(err)46	}47	defer logsFile.Close()48	_, err = io.Copy(logsFile, logs)49	if err != nil {50		log.Fatal(err)51	}

Logs

Using AI Code Generation

1func TestLogs(t *testing.T) {2    ctx := context.Background()3    req := testcontainers.ContainerRequest{4        Cmd:          []string{"sh", "-c", "while true; do echo hello; sleep 1; done"},5    }6    resp, err := testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{7    })8    if err != nil {9        panic(err)10    }11    defer resp.Terminate(ctx)12    logs, err := resp.Logs(ctx)13    if err != nil {14        panic(err)15    }16    defer logs.Close()17    scanner := bufio.NewScanner(logs)18    for scanner.Scan() {19        t.Log(scanner.Text())20    }21}22func TestLogs2(t *testing.T) {23    ctx := context.Background()24    req := testcontainers.ContainerRequest{25        Cmd:          []string{"sh", "-c", "while true; do echo hello; sleep 1; done"},26    }27    resp, err := testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{28    })29    if err != nil {30        panic(err)31    }32    defer resp.Terminate(ctx)33    logs, err := resp.Logs(ctx)34    if err != nil {35        panic(err)36    }37    defer logs.Close()38    scanner := bufio.NewScanner(logs)39    for scanner.Scan() {40        t.Log(scanner.Text())41    }42}43func TestLogs3(t *testing.T) {44    ctx := context.Background()45    req := testcontainers.ContainerRequest{46        Cmd:          []string{"sh", "-c", "while true; do echo hello; sleep 1; done"},47    }48    resp, err := testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest

Logs

Using AI Code Generation

1import (2func main() {3	req := testcontainers.ContainerRequest{4		ExposedPorts: []string{"27017/tcp"},5		WaitingFor:   wait.ForListeningPort("27017/tcp"),6	}7	ctx := context.Background()8	mongo, err := testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{9	})10	if err != nil {11		log.Fatal(err)12	}13	containerID, err := mongo.ContainerID(ctx)14	if err != nil {15		log.Fatal(err)16	}17	ip, err := mongo.Host(ctx)18	if err != nil {19		log.Fatal(err)20	}21	port, err := mongo.MappedPort(ctx, "27017/tcp")22	if err != nil {23		log.Fatal(err)24	}25	defer mongo.Terminate(ctx)26	fmt.Println("Container ID: ", containerID)27	fmt.Println("Container IP: ", ip)28	fmt.Println("Container Port: ", port.Int())29	logs, err := mongo.Logs(ctx)30	if err != nil {31		log.Fatal(err)32	}33	defer logs.Close()34	out, err := ioutil.ReadAll(logs)35	if err != nil {36		log.Fatal(err)37	}38	fmt.Println("Container Logs: ", string(out))39	logs, err = mongo.Logs(ctx, testcontainers.LogsOptions{40	})41	if err != nil {42		log.Fatal(err)43	}44	defer logs.Close()45	out, err = ioutil.ReadAll(logs)46	if err != nil {47		log.Fatal(err)48	}49	fmt.Println("Container Logs: ", string(out))

Logs

Using AI Code Generation

1func main() {2    ctx := context.Background()3    req := testcontainers.ContainerRequest{4        Env:          map[string]string{"MYSQL_ROOT_PASSWORD": "password"},5        ExposedPorts: []string{"3306/tcp"},6        WaitingFor:   wait.ForListeningPort("3306/tcp"),7    }8    mysql, err := testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{9    })10    if err != nil {11        panic(err)12    }13    defer mysql.Terminate(ctx)14    ip, err := mysql.Host(ctx)15    if err != nil {16        panic(err)17    }18    port, err := mysql.MappedPort(ctx, "3306")19    if err != nil {20        panic(err)21    }22    fmt.Println("host:", ip)23    fmt.Println("port:", port.Int())24    fmt.Println("logs:", mysql.Logs(ctx))25}

Logs

Using AI Code Generation

1func main() {2    ctx := context.Background()3    req := testcontainers.ContainerRequest{4        Cmd:          []string{"echo", "hello world"},5    }6    c, err := testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{7    })8    if err != nil {9        panic(err)10    }11    defer c.Terminate(ctx)12    logs, err := c.Logs(ctx)13    if err != nil {14        panic(err)15    }16    io.Copy(os.Stdout, logs)17}

Logs

Using AI Code Generation

1import (2func main() {3	containerRequest := testcontainers.ContainerRequest{4		ExposedPorts: []string{"80/tcp"},5		Cmd:          []string{"echo", "hello world"},6		WaitingFor:   wait.ForLog("hello world"),7	}8	ctx := context.Background()9	container, err := testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{10	})11	if err != nil {12		fmt.Println("Error while creating container: ", err)13	}14	defer container.Terminate(ctx)15	logs, err := container.Logs(ctx)16	if err != nil {17		fmt.Println("Error while getting logs: ", err)18	}19	fmt.Println("Logs: ", logs)20}21Your name to display (optional):

Logs

Using AI Code Generation

1import (2func main() {3	ctx := context.Background()4	req := testcontainers.ContainerRequest{5		ExposedPorts: []string{"80/tcp"},6		Cmd:          []string{"echo", "hello world"},7		WaitingFor:   wait.ForLog("hello world"),8	}9	container, err := testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{10	})11	if err != nil {12		panic(err)13	}14	ip, err := container.Host(ctx)15	if err != nil {16		panic(err)17	}18	port, err := container.MappedPort(ctx, "80")19	if err != nil {20		panic(err)21	}22	fmt.Printf("Container IP: %s, Port: %s23", ip, port.Port())24	err = container.Terminate(ctx)25	if err != nil {26		panic(err)27	}28	logs, err := container.Logs(ctx)29	if err != nil {30		panic(err)31	}32	io.Copy(log.Writer(), logs)33	err = container.Remove(ctx)34	if err != nil {35		panic(err)36	}37}

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