java support is added (#611)

Author: BupycHuk

examples/hello/java/.gitignore

@@ -0,0 +1,4 @@
+*.class
+*.iml
+
+func.yaml

examples/hello/java/Func.java

@@ -0,0 +1,24 @@
+import com.google.gson.Gson;
+import com.google.gson.stream.JsonReader;
+
+import java.io.InputStreamReader;
+
+public class Func {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        JsonReader br = new JsonReader(new InputStreamReader(System.in));
+        Gson gson = new Gson();
+        Payload payload = gson.fromJson(br, Payload.class);
+        if (payload == null) {
+            payload = new Payload("world");
+        }
+
+        System.out.printf("Hello %s!\n", payload.getName());
+
+    }
+}
+
+

examples/hello/java/Payload.java

@@ -0,0 +1,18 @@
+public class Payload {
+    private String name;
+
+    public Payload() {
+    }
+
+    public Payload(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}

examples/hello/java/README.md

@@ -0,0 +1,27 @@
+# Quick Example for a Java Function (3 minutes)
+
+This example will show you how to test and deploy Java code to IronFunctions.
+
+```sh
+# create your func.yaml file
+fn init <YOUR_DOCKERHUB_USERNAME>/hello
+# build the function
+fn build
+# test it
+cat hello.payload.json | fn run
+# push it to Docker Hub
+fn push
+# Create a route to this function on IronFunctions
+fn routes create myapp /hello
+```
+
+Now you can call your function on IronFunctions:
+
+```sh
+curl -H "Content-Type: application/json" -X POST -d @hello.payload.json http://localhost:8080/r/myapp/hello
+```
+
+
+## Dependencies
+
+Be sure you're dependencies are in the `lib/` directory and that's it.

examples/hello/java/hello.payload.json

@@ -0,0 +1,3 @@
+{
+    "name": "Johnny"
+}

examples/hello/java/lib/gson-2.2.4.jar

@@ -23,13 +23,19 @@ import (
 
 var (
 	fileExtToRuntime = map[string]string{
-		".go": "go",
-		".js": "node",
-		".rb": "ruby",
-		".py": "python",
-		".rs": "rust",
-		".cs": "dotnet",
-		".fs": "dotnet",
+		".go":   "go",
+		".js":   "node",
+		".rb":   "ruby",
+		".py":   "python",
+		".rs":   "rust",
+		".cs":   "dotnet",
+		".fs":   "dotnet",
+		".java": "java",
+	}
+
+	filenames = []string{
+		"func",
+		"Func",
 	}
 
 	fnInitRuntimes []string
@@ -194,9 +200,11 @@ func (a *initFnCmd) buildFuncFile(c *cli.Context) error {
 
 func detectRuntime(path string) (runtime string, err error) {
 	for ext, runtime := range fileExtToRuntime {
-		fn := filepath.Join(path, fmt.Sprintf("func%s", ext))
-		if exists(fn) {
-			return runtime, nil
+		for _, filename := range filenames {
+			fn := filepath.Join(path, fmt.Sprintf("%s%s", filename, ext))
+			if exists(fn) {
+				return runtime, nil
+			}
 		}
 	}
 	return "", fmt.Errorf("no supported files found to guess runtime, please set runtime explicitly with --runtime flag")

fn/init.go

@@ -15,6 +15,8 @@ func GetLangHelper(lang string) LangHelper {
 		return &RustLangHelper{}
 	case "dotnet":
 		return &DotNetLangHelper{}
+	case "java":
+		return &JavaLangHelper{}
 	case "lambda-nodejs4.3":
 		return &LambdaNodeHelper{}
 	}

fn/langs/base.go

@@ -0,0 +1,44 @@
+package langs
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+)
+
+type JavaLangHelper struct {
+	BaseHelper
+}
+
+func (lh *JavaLangHelper) Entrypoint() string {
+	return "java -cp lib/*:. Func"
+}
+
+func (lh *JavaLangHelper) HasPreBuild() bool {
+	return true
+}
+
+// PreBuild for Go builds the binary so the final image can be as small as possible
+func (lh *JavaLangHelper) PreBuild() error {
+	wd, err := os.Getwd()
+	if err != nil {
+		return err
+	}
+
+	cmd := exec.Command(
+		"docker", "run",
+		"--rm", "-v",
+		wd+":/java", "-w", "/java", "iron/java:dev",
+		"/bin/sh", "-c", "javac -cp lib/*:. *.java",
+	)
+	cmd.Stderr = os.Stderr
+	cmd.Stdout = os.Stdout
+	if err := cmd.Run(); err != nil {
+		return fmt.Errorf("error running docker build: %v", err)
+	}
+	return nil
+}
+
+func (lh *JavaLangHelper) AfterBuild() error {
+	return nil
+}