🚧 : rework of the job management

src/main/java/io/codeka/gaia/runner/DockerRunner.java

@@ -0,0 +1,98 @@
+package io.codeka.gaia.runner;
+
+import com.spotify.docker.client.DockerClient;
+import com.spotify.docker.client.exceptions.DockerException;
+import com.spotify.docker.client.messages.ContainerConfig;
+import io.codeka.gaia.settings.bo.Settings;
+import io.codeka.gaia.stacks.workflow.JobWorkflow;
+import org.apache.commons.io.output.WriterOutputStream;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.channels.Channels;
+import java.nio.channels.WritableByteChannel;
+import java.nio.charset.Charset;
+import java.util.ArrayList;
+import java.util.concurrent.CompletableFuture;
+
+/**
+ * Service to run docker container
+ */
+@Service
+public class DockerRunner {
+
+    private static final Logger LOG = LoggerFactory.getLogger(DockerRunner.class);
+
+    private DockerClient dockerClient;
+    private ContainerConfig.Builder containerConfigBuilder;
+    private HttpHijackWorkaround httpHijackWorkaround;
+    private Settings settings;
+
+    @Autowired
+    public DockerRunner(DockerClient dockerClient, ContainerConfig.Builder containerConfigBuilder,
+                        HttpHijackWorkaround httpHijackWorkaround, Settings settings) {
+        this.dockerClient = dockerClient;
+        this.containerConfigBuilder = containerConfigBuilder;
+        this.httpHijackWorkaround = httpHijackWorkaround;
+        this.settings = settings;
+    }
+
+    int runContainerForJob(JobWorkflow jobWorkflow, String script) {
+        try {
+            var env = new ArrayList<String>();
+            env.add("TF_IN_AUTOMATION=true");
+            env.addAll(settings.env());
+
+            var job = jobWorkflow.getJob();
+
+            // FIXME This is certainly no thread safe !
+            var containerConfig = containerConfigBuilder
+                    .env(env)
+                    .image("hashicorp/terraform:" + job.getCliVersion())
+                    .build();
+
+            // pull the image
+            dockerClient.pull("hashicorp/terraform:" + job.getCliVersion());
+
+            var containerCreation = dockerClient.createContainer(containerConfig);
+            var containerId = containerCreation.id();
+
+            var dockerContainer = new DockerContainer(containerId, dockerClient, httpHijackWorkaround);
+
+            dockerClient.startContainer(containerId);
+
+            // attaching the outputs in a background thread
+            var step = jobWorkflow.getCurrentStep();
+            CompletableFuture.runAsync(() -> {
+                try (var writerOutputStream = new WriterOutputStream(step.getLogsWriter(), Charset.defaultCharset())) {
+                    // this code is blocking I/O !
+                    dockerContainer.attach(writerOutputStream, writerOutputStream);
+                } catch (IOException | StackRunnerException e) {
+                    LOG.error("Unable to attach logs of container", e);
+                }
+            });
+
+            // write the content of the script to the container's std in
+            try (WritableByteChannel stdIn = Channels.newChannel(dockerContainer.getStdIn())) {
+                stdIn.write(ByteBuffer.wrap(script.getBytes()));
+            }
+
+            // wait for the container to exit
+            var containerExit = dockerClient.waitContainer(containerCreation.id());
+
+            dockerClient.removeContainer(containerCreation.id());
+
+            return Math.toIntExact(containerExit.statusCode());
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+            return 99;
+        } catch (DockerException | IOException | StackRunnerException e) {
+            return 99;
+        }
+    }
+
+}

src/main/java/io/codeka/gaia/runner/StackCommandBuilder.java

@@ -70,6 +70,15 @@ private String buildCommand(Stack stack, TerraformModule module, String command)
         return String.format("%s %s", command, variablesBuilder.toString());
     }
 
+    /**
+     * builds the terraform plan script
+     *
+     * @return
+     */
+    String buildPlanScript(Stack stack, TerraformModule module) {
+        return buildScript(stack, module, this::buildPlanCommand);
+    }
+
     /**
      * builds the terraform apply script
      *
@@ -84,8 +93,8 @@ String buildApplyScript(Stack stack, TerraformModule module) {
      *
      * @return
      */
-    String buildPlanScript(Stack stack, TerraformModule module) {
-        return buildScript(stack, module, this::buildPlanCommand);
+    String buildPlanDestroyScript(Stack stack, TerraformModule module) {
+        return buildScript(stack, module, this::buildPlanDestroyCommand);
     }
 
     /**
@@ -97,6 +106,17 @@ String buildDestroyScript(Stack stack, TerraformModule module) {
         return buildScript(stack, module, this::buildDestroyCommand);
     }
 
+    /**
+     * builds the terraform plan command
+     *
+     * @param stack
+     * @param module
+     * @return
+     */
+    String buildPlanCommand(Stack stack, TerraformModule module) {
+        return buildCommand(stack, module, "terraform plan -detailed-exitcode");
+    }
+
     /**
      * builds the terraform apply command
      *
@@ -109,14 +129,14 @@ String buildApplyCommand(Stack stack, TerraformModule module) {
     }
 
     /**
-     * builds the terraform plan command
+     * builds the terraform plan destroy command
      *
      * @param stack
      * @param module
      * @return
      */
-    String buildPlanCommand(Stack stack, TerraformModule module) {
-        return buildCommand(stack, module, "terraform plan -detailed-exitcode");
+    String buildPlanDestroyCommand(Stack stack, TerraformModule module) {
+        return buildCommand(stack, module, "terraform plan -destroy -detailed-exitcode");
     }
 
     /**