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Make it possible to run TestContainers inside a container. Fixes test…
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| @@ -0,0 +1 @@ | ||
| distributionUrl=https://repo1.maven.org/maven2/org/apache/maven/apache-maven/3.3.9/apache-maven-3.3.9-bin.zip |
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55 changes: 45 additions & 10 deletions
55
core/src/main/java/org/testcontainers/dockerclient/DockerClientConfigUtils.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,18 +1,53 @@ | ||
| package org.testcontainers.dockerclient; | ||
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| import com.github.dockerjava.core.DockerClientConfig; | ||
| import lombok.Getter; | ||
| import lombok.extern.slf4j.Slf4j; | ||
| import org.apache.commons.lang.StringUtils; | ||
| import org.testcontainers.DockerClientFactory; | ||
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| import java.io.File; | ||
| import java.util.Optional; | ||
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| @Slf4j | ||
| public class DockerClientConfigUtils { | ||
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| // See https://github.com/docker/docker/blob/a9fa38b1edf30b23cae3eade0be48b3d4b1de14b/daemon/initlayer/setup_unix.go#L25 | ||
| public static final boolean IN_A_CONTAINER = new File("/.dockerenv").exists(); | ||
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| @Getter(lazy = true) | ||
| private static final Optional<String> detectedDockerHostIp = Optional | ||
| .of(IN_A_CONTAINER) | ||
| .filter(it -> it) | ||
| .map(file -> DockerClientFactory.instance().runInsideDocker( | ||
| cmd -> cmd.withCmd("sh", "-c", "ip route|awk '/default/ { print $3 }'"), | ||
| (client, id) -> { | ||
| try { | ||
| return client.logContainerCmd(id) | ||
| .withStdOut(true) | ||
| .exec(new LogToStringContainerCallback()) | ||
| .toString(); | ||
| } catch (Exception e) { | ||
| log.warn("Can't parse the default gateway IP", e); | ||
| return null; | ||
| } | ||
| } | ||
| )) | ||
| .map(StringUtils::trimToEmpty) | ||
| .filter(StringUtils::isNotBlank); | ||
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| public static String getDockerHostIpAddress(DockerClientConfig config) { | ||
| switch (config.getDockerHost().getScheme()) { | ||
| case "http": | ||
| case "https": | ||
| case "tcp": | ||
| return config.getDockerHost().getHost(); | ||
| case "unix": | ||
| return "localhost"; | ||
| default: | ||
| return null; | ||
| } | ||
| return getDetectedDockerHostIp().orElseGet(() -> { | ||
| switch (config.getDockerHost().getScheme()) { | ||
| case "http": | ||
| case "https": | ||
| case "tcp": | ||
| return config.getDockerHost().getHost(); | ||
| case "unix": | ||
| return "localhost"; | ||
| default: | ||
| return null; | ||
| } | ||
| }); | ||
| } | ||
| } |
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24 changes: 24 additions & 0 deletions
24
core/src/main/java/org/testcontainers/dockerclient/LogToStringContainerCallback.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,24 @@ | ||
| package org.testcontainers.dockerclient; | ||
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| import com.github.dockerjava.api.model.Frame; | ||
| import com.github.dockerjava.core.command.LogContainerResultCallback; | ||
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| public class LogToStringContainerCallback extends LogContainerResultCallback { | ||
| private final StringBuffer log = new StringBuffer(); | ||
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| @Override | ||
| public void onNext(Frame frame) { | ||
| log.append(new String(frame.getPayload())); | ||
| super.onNext(frame); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| try { | ||
| awaitCompletion(); | ||
| } catch (InterruptedException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| return log.toString(); | ||
| } | ||
| } |
37 changes: 37 additions & 0 deletions
37
core/src/test/java/org/testcontainers/dockerclient/DockerInDockerTest.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,37 @@ | ||
| package org.testcontainers.dockerclient; | ||
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| import org.junit.ClassRule; | ||
| import org.junit.Rule; | ||
| import org.junit.Test; | ||
| import org.junit.rules.TestRule; | ||
| import org.junit.rules.TestWatcher; | ||
| import org.junit.runner.Description; | ||
| import org.junit.runners.model.Statement; | ||
| import org.testcontainers.containers.GenericContainer; | ||
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| import static org.junit.Assume.assumeTrue; | ||
| import static org.rnorth.visibleassertions.VisibleAssertions.assertEquals; | ||
| import static org.testcontainers.junit.GenericContainerRuleTest.getReaderForContainerPort80; | ||
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| public class DockerInDockerTest { | ||
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| @ClassRule | ||
| public static TestRule assumption = new TestWatcher() { | ||
| @Override | ||
| public Statement apply(Statement base, Description description) { | ||
| assumeTrue("We're inside a container", DockerClientConfigUtils.IN_A_CONTAINER); | ||
| return super.apply(base, description); | ||
| } | ||
| }; | ||
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| @Rule | ||
| public GenericContainer container = new GenericContainer("alpine:3.2") | ||
| .withExposedPorts(80) | ||
| .withCommand("/bin/sh", "-c", "while true; do echo \"hello\" | nc -l -p 80; done"); | ||
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| @Test | ||
| public void testIpDetection() throws Exception { | ||
| String line = getReaderForContainerPort80(container).readLine(); | ||
| assertEquals("The container is accessible", "hello", line); | ||
| } | ||
| } |
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