Improved build script and Docker builds

Caching pip packages as suggested by Alfonso.

bin/build.py

 import os
 import shutil
 import sys
+from typing import Dict
 
-DOCKER_COMPOSE_NAME = "Dockerfile"
+DOCKER_BUILD_NAME = "Dockerfile"
 ROOT = './'
 SOURCEPATH = f'{ROOT}src/'
-DOCKER_USERNAME = "alexx882"
+DOCKERHUB_REPO_OWNER = "alexx882"
 
-p_image_name = None
-if len(sys.argv) == 2:
-    # parameter contains image to build
-    p_image_name = sys.argv[1]
 
-paths = []
-for r, _, f in os.walk(SOURCEPATH):
+def print_help():
+    print("""
+        Use this script to build Docker images and upload them to Docker Hub.
+        For the upload to work, the current user must be logged in on the Docker CLI and must have push access to the repositories.
+
+        Parameters: [image_name]
+
+        image_name ... only build this image
+    """)
+
+
+def get_dockerfile_paths_and_names() -> Dict[str, str]:
+    paths = []
+    for r, _, f in os.walk(SOURCEPATH):
         for filename in f:
-        if DOCKER_COMPOSE_NAME == filename:
+            if DOCKER_BUILD_NAME == filename:
                 paths.append(os.path.normpath(r))
 
-command_args = [{'path': path,
+    command_args = [{'path': path,
                      'name': str(path).split(os.path.normpath('/'))[-1]}
                     for path
                     in paths]
 
-if p_image_name is not None:
-    command_args = [x for x in command_args if x['name']==p_image_name]
+    return command_args
+
+
+if __name__ == '__main__':
+    p_image_name = None
 
-error:int = 0
-res_str = []
-for command_arg in command_args:
+    if len(sys.argv) == 2:
+        arg = sys.argv[1]
+        if arg == 'help':
+            print_help()
+            sys.exit(0)
+        else:
+            # parameter contains image name to be build
+            p_image_name = arg
+
+    command_args = get_dockerfile_paths_and_names()
+
+    if p_image_name is not None:
+        # filter for argument image name
+        command_args = [x for x in command_args
+                        if (p_image_name in x['name'])]
+
+    error: int = 0
+    res_str = []
+    for command_arg in command_args:
         path = command_arg['path']
-    image_name = f"{DOCKER_USERNAME}/{command_arg['name']}"
+        image_name = f"{DOCKERHUB_REPO_OWNER}/{command_arg['name']}"
 
         # copy Dockerfile into root dir to have access to modules folder
-    shutil.copy2(os.path.join(path, DOCKER_COMPOSE_NAME), ROOT)
+        shutil.copy2(os.path.join(path, DOCKER_BUILD_NAME), ROOT)
 
         # build then remove Dockerfile
         exit_val = os.system(f"docker image build -t {image_name} {ROOT}")
-    os.remove(os.path.join(ROOT, DOCKER_COMPOSE_NAME))
+        os.remove(os.path.join(ROOT, DOCKER_BUILD_NAME))
 
         res_str.append(f"{image_name} built with exit code {exit_val}")
 
@@ -52,9 +80,8 @@ for command_arg in command_args:
             if exit_val != 0:
                 error = exit_val
 
-
-print(f"Found {len(command_args)} images")
-for s in res_str:
+    print(f"Found {len(command_args)} images")
+    for s in res_str:
         print(s)
 
-sys.exit(1 if error > 0 else 0)
+    sys.exit(1 if error > 0 else 0)
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src/data-hub/community-detection-microservice/Dockerfile

@@ -9,10 +9,13 @@ RUN apt-get update
 EXPOSE 5000
 
 WORKDIR /app
-COPY src/modules/ /app/
-COPY src/data-hub/community-detection-microservice/app/ /app/
 
+# https://www.aptible.com/documentation/faq/deploy/dockerfile-caching/pip-dockerfile-caching.html
+COPY src/data-hub/community-detection-microservice/app/requirements.txt /app/
 RUN pip install -r requirements.txt
+
+COPY src/modules/ /app/
+COPY src/data-hub/community-detection-microservice/app/ /app/
 RUN chmod a+x main.py
 
 CMD ["python", "./main.py"]
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src/data-hub/semantic-linking-microservice/Dockerfile

@@ -9,10 +9,12 @@ RUN apt-get update
 EXPOSE 5000
 
 WORKDIR /app
-COPY src/data-hub/semantic-linking-microservice/app/ /app/
-COPY src/modules/ /app/
 
+COPY src/data-hub/semantic-linking-microservice/app/requirements.txt /app/
 RUN pip install -r requirements.txt
+
+COPY src/data-hub/semantic-linking-microservice/app/ /app/
+COPY src/modules/ /app/
 RUN chmod a+x main.py
 
 CMD ["python", "./main.py"]
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src/rest-gateway/Dockerfile

@@ -9,10 +9,12 @@ RUN apt-get update
 EXPOSE 5000
 
 WORKDIR /app
-COPY src/rest-gateway/app/ /app/
-COPY src/modules/ /app/
 
+COPY src/rest-gateway/app/requirements.txt /app/
 RUN pip install -r requirements.txt
+
+COPY src/rest-gateway/app/ /app/
+COPY src/modules/ /app/
 RUN chmod a+x main.py
 
 CMD ["python", "./main.py"]
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src/transaction-hub-in/trace-retrieval-microservice/Dockerfile

@@ -9,10 +9,12 @@ RUN apt-get update
 EXPOSE 5000
 
 WORKDIR /app
-COPY src/transaction-hub-in/trace-retrieval-microservice/app/ /app/
-COPY src/modules/ /app/
 
+COPY src/transaction-hub-in/trace-retrieval-microservice/app/requirements.txt /app/
 RUN pip install -r requirements.txt
+
+COPY src/transaction-hub-in/trace-retrieval-microservice/app/ /app/
+COPY src/modules/ /app/
 RUN chmod a+x main.py
 
 CMD ["python", "./main.py"]
\ No newline at end of file