Added version API

src/main/java/com/amihaiemil/docker/Docker.java

@@ -103,6 +103,13 @@ Reader events()
      */
     Plugins plugins();
 
+    /**
+     * Entry point for Version API.
+     * @return Version.
+     * @throws IOException If an I/O error occurs.
+     */
+    Version version() throws IOException;
+
     /**
      * The underlying, immutable, Apache HttpClient.<br><br>
      *

src/main/java/com/amihaiemil/docker/RtDocker.java

@@ -158,6 +158,15 @@ public Plugins plugins() {
         );
     }
 
+    @Override
+    public Version version() throws IOException {
+        final String versionUri = this.baseUri.toString() + "/version";
+        return new RtVersion(
+            this.client,
+            URI.create(versionUri)
+        );
+    }
+
     @Override
     public HttpClient httpClient() {
         return this.client;

src/main/java/com/amihaiemil/docker/RtVersion.java

@@ -0,0 +1,137 @@
+/**
+ * Copyright (c) 2018-2019, Mihai Emil Andronache
+ * All rights reserved.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 1)Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2)Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3)Neither the name of docker-java-api nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.amihaiemil.docker;
+
+import org.apache.http.HttpStatus;
+import org.apache.http.client.HttpClient;
+import org.apache.http.client.methods.HttpGet;
+
+import javax.json.JsonObject;
+import java.io.IOException;
+import java.net.URI;
+
+/**
+ * Runtime {@link Version}.
+ * @author Michael Lux ([email protected])
+ * @since 0.0.11
+ */
+final class RtVersion extends JsonResource implements Version {
+    /**
+     * Ctor.
+     * @param client The http client.
+     * @param uri The URI for this version.
+     * @throws IOException If an I/O error occurs.
+     */
+    RtVersion(final HttpClient client, final URI uri) throws IOException {
+        super(fetch(client, uri));
+    }
+
+    /**
+     * Fetch the JsonObject resource.
+     * @param client The Http client.
+     * @param uri The request URL.
+     * @return The fetched JsonObject.
+     * @throws UnexpectedResponseException If Docker's response code is not 200.
+     * @throws IOException If an I/O error occurs.
+     */
+    private static JsonObject fetch(final HttpClient client, final URI uri)
+        throws UnexpectedResponseException, IOException {
+        final HttpGet version = new HttpGet(uri);
+        try {
+            return client.execute(
+                version,
+                new ReadJsonObject(
+                    new MatchStatus(version.getURI(), HttpStatus.SC_OK)
+                )
+            );
+        } finally {
+            version.releaseConnection();
+        }
+    }
+
+    /**
+     * Returns the version of the connected docker engine.
+     * @return Version of connected docker engine
+     */
+    @Override
+    public String version() {
+        return this.getString("Version");
+    }
+
+    /**
+     * Returns the name of the connected docker platform.
+     * @return Name of the docker platform
+     */
+    @Override
+    public String platformName() {
+        return this.getJsonObject("Platform").getString("Name");
+    }
+
+    /**
+     * Returns the API version of the docker engine.
+     * @return API version
+     */
+    @Override
+    public String apiVersion() {
+        return this.getString("ApiVersion");
+    }
+
+    /**
+     * Returns the minimum API version of the docker engine.
+     * @return Minimum API version
+     */
+    @Override
+    public String minApiVersion() {
+        return this.getString("MinAPIVersion");
+    }
+
+    /**
+     * Returns the OS docker is running on.
+     * @return Name of the OS docker is running on
+     */
+    @Override
+    public String osName() {
+        return this.getString("Os");
+    }
+
+    /**
+     * Returns the (CPU) architecture docker is running on.
+     * @return The (CPU) architecture docker is running on
+     */
+    @Override
+    public String arch() {
+        return this.getString("Arch");
+    }
+
+    /**
+     * Reports whether experimental docker features are enabled.
+     * @return Whether experimental docker features are enabled
+     */
+    @Override
+    public boolean experimental() {
+        return this.getBoolean("Experimental");
+    }
+}

src/main/java/com/amihaiemil/docker/Version.java

@@ -0,0 +1,52 @@
+package com.amihaiemil.docker;
+
+import javax.json.JsonObject;
+
+/**
+ * Version API.
+ * @author Michael Lux ([email protected])
+ * @since 0.0.11
+ */
+public interface Version extends JsonObject {
+    /**
+     * Returns the version of the connected docker engine.
+     * @return Version of connected docker engine
+     */
+    String version();
+
+    /**
+     * Returns the name of the connected docker platform.
+     * @return Name of the docker platform
+     */
+    String platformName();
+
+    /**
+     * Returns the API version of the docker engine.
+     * @return API version
+     */
+    String apiVersion();
+
+    /**
+     * Returns the minimum API version of the docker engine.
+     * @return Minimum API version
+     */
+    String minApiVersion();
+
+    /**
+     * Returns the OS docker is running on.
+     * @return Name of the OS docker is running on
+     */
+    String osName();
+
+    /**
+     * Returns the (CPU) architecture docker is running on.
+     * @return The (CPU) architecture docker is running on
+     */
+    String arch();
+
+    /**
+     * Reports whether experimental docker features are enabled.
+     * @return Whether experimental docker features are enabled
+     */
+    boolean experimental();
+}

src/test/java/com/amihaiemil/docker/RtVersionTestCase.java

@@ -0,0 +1,59 @@
+package com.amihaiemil.docker;
+
+import org.apache.http.HttpEntity;
+import org.apache.http.HttpResponse;
+import org.apache.http.HttpStatus;
+import org.apache.http.StatusLine;
+import org.apache.http.client.HttpClient;
+import org.apache.http.client.ResponseHandler;
+import org.apache.http.client.methods.HttpGet;
+import org.junit.Test;
+
+import java.io.IOException;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.mockito.Matchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+/**
+ * Unit tests for {@link RtVersion}.
+ * @author Michael Lux ([email protected])
+ * @since 0.0.11
+ */
+public class RtVersionTestCase {
+    /**
+     * Must return the same number of images as there are elements in the
+     * json array returned by the service.
+     * @throws IOException On I/O error.
+     */
+    @Test
+    public final void queryDockerVersion() throws IOException {
+        HttpClient client = mock(HttpClient.class);
+        when(client.execute(any(HttpGet.class), any(ResponseHandler.class)))
+            .thenAnswer(invocation -> {
+                HttpResponse response = mock(HttpResponse.class);
+                HttpEntity entity = mock(HttpEntity.class);
+                when(response.getEntity()).thenReturn(entity);
+                when(entity.getContent()).thenReturn(
+                    getClass().getClassLoader()
+                        .getResourceAsStream("version.json"));
+                StatusLine statusLine = mock(StatusLine.class);
+                when(response.getStatusLine()).thenReturn(statusLine);
+                when(statusLine.getStatusCode()).thenReturn(HttpStatus.SC_OK);
+                return ((ReadJsonObject) invocation.getArguments()[1])
+                    .handleResponse(response);
+            });
+        Docker docker = new LocalDocker(client, "v1.35");
+        Version version = docker.version();
+        assertEquals("19.03.3", version.version());
+        assertEquals("Docker Engine - Community", version.platformName());
+        assertEquals("1.40", version.apiVersion());
+        assertEquals("1.12", version.minApiVersion());
+        assertEquals("linux", version.osName());
+        assertEquals("amd64", version.arch());
+        assertTrue(version.experimental());
+    }
+
+}

src/test/resources/version.json

@@ -0,0 +1 @@
+{"Platform":{"Name":"Docker Engine - Community"},"Components":[{"Name":"Engine","Version":"19.03.3","Details":{"ApiVersion":"1.40","Arch":"amd64","BuildTime":"2019-10-08T00:59:17.000000000+00:00","Experimental":"true","GitCommit":"a872fc2f86","GoVersion":"go1.12.10","KernelVersion":"5.3.0-40-generic","MinAPIVersion":"1.12","Os":"linux"}},{"Name":"containerd","Version":"1.2.10","Details":{"GitCommit":"b34a5c8af56e510852c35414db4c1f4fa6172339"}},{"Name":"runc","Version":"1.0.0-rc8+dev","Details":{"GitCommit":"3e425f80a8c931f88e6d94a8c831b9d5aa481657"}},{"Name":"docker-init","Version":"0.18.0","Details":{"GitCommit":"fec3683"}}],"Version":"19.03.3","ApiVersion":"1.40","MinAPIVersion":"1.12","GitCommit":"a872fc2f86","GoVersion":"go1.12.10","Os":"linux","Arch":"amd64","KernelVersion":"5.3.0-40-generic","Experimental":true,"BuildTime":"2019-10-08T00:59:17.000000000+00:00"}