[cw|frenata#5] add docker-compose and .env files

Major Changes:
* add docker-compose.yml for orchestrating building and running
  containers
* add .env file for setting environment variables inside docker
  containers

TODO:
* integrate test code to run on container startup
* create shared volumes for input/output between api server and
  compilebox

.env

@@ -0,0 +1,2 @@
+# API server vars
+COMPILEBOX_API_SERVER_PORT=31337

API/src/compilebox/main.go

@@ -31,7 +31,7 @@ type ExecutionResult struct {
 var box sandbox.Interface
 
 func main() {
-	port := getEnv("COMPILEBOX_PORT", "31337")
+	port := getEnv("COMPILEBOX_API_SERVER_PORT", "31337")
 
 	box = sandbox.New("data/compilers.json")
 

API/src/sandbox/docker_spawner.go

@@ -33,6 +33,7 @@ func DefaultSandboxOptions() SandboxOptions {
 		tmp = "/tmp"
 	}
 
+	// TODO (cw|3.9.18) get vm_name from environment variable in .env file
 	return SandboxOptions{tmp, pwd, "virtual_machine", time.Second * 5}
 }
 

Dockerfile

@@ -32,7 +32,8 @@ WORKDIR /bin/
 # copy over single binary from build stage --^
 COPY --from=server /go/bin/compilebox .
 
-EXPOSE 6666
+# copy compilers data
+COPY ./API/data/compilers.json ./data/compilers.json
 
 # run comilebox API server
 CMD ["compilebox"]

docker-compose.yml

@@ -0,0 +1,17 @@
+version: '2'
+services:
+  compilebox_api_server:
+    build:
+      context: .
+    env_file: .env
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock  # use host Docker daemon
+    ports:
+      - "${COMPILEBOX_API_SERVER_PORT}:${COMPILEBOX_API_SERVER_PORT}"
+    depends_on:
+      - compilebox
+  compilebox:
+    env_file: .env
+    build:
+      context: ./Setup/
+    command: echo "compilebox build complete"