Moved printing into its own separate project called frank. It also has its own toml and deployement system.

It also works on a raspberry pi

deploy.sh

@@ -21,6 +21,5 @@ docker build --tag barker:latest .
 docker build --tag barker-worker:latest --file worker.Dockerfile .
 cd "$parent_path/docker" || exit
 docker save barker:latest | bzip2 | pv | ssh tanshu@knox.tanshu.com 'bunzip2 | sudo docker load'
-docker save barker-worker:latest | bzip2 | pv | ssh tanshu@knox.tanshu.com 'bunzip2 | sudo docker load'
 ansible-playbook playbook-chd.yml
 ansible-playbook playbook-pkl.yml

docker/app/frank.Dockerfile

@@ -0,0 +1,24 @@
+FROM python:latest
+RUN mkdir /app
+WORKDIR /app
+ADD https://git.tanshu.com/tanshu/barker/raw/branch/main/frank/pyproject.toml /app/pyproject.toml
+
+# Install Poetry
+RUN curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | POETRY_HOME=/opt/poetry python && \
+    cd /usr/local/bin && \
+    ln -s /opt/poetry/bin/poetry && \
+    poetry config virtualenvs.create false && \
+    cd /app && \
+    poetry install --no-root --no-dev
+
+ADD https://git.tanshu.com/api/v1/repos/tanshu/barker/tags /tags.json
+RUN git clone --single-branch --depth 1 https://git.tanshu.com/tanshu/barker.git /repo
+RUN mv /repo/frank/* /app
+
+ENV PYTHONPATH=/app
+
+RUN chmod 777 /app/worker-start.sh \
+    && ln -s /app/worker-start.sh /usr/local/bin/worker-start.sh \
+    && ln -s /app/worker-start.sh /
+
+CMD ["bash", "worker-start.sh"]

docker/app/worker.Dockerfile

@@ -1,8 +0,0 @@
-FROM barker:latest
-LABEL maintainer="Amritanshu <docker@tanshu.com>"
-
-RUN chmod 777 /app/worker-start.sh \
-    && ln -s /app/worker-start.sh /usr/local/bin/worker-start.sh \
-    && ln -s /app/worker-start.sh /
-
-CMD ["bash", "worker-start.sh"]

docker/files/chd-worker.env

@@ -1,3 +0,0 @@
-WORKER_REDIS_HOST=redis
-WORKER_REDIS_PORT=6379
-WORKER_QUEUE_NAME="DJ Computer"

docker/files/frank.env

@@ -0,0 +1,3 @@
+REDIS_HOST=localhost
+REDIS_PORT=6379
+QUEUE_NAME=DJ Computer

docker/files/pkl-worker.env

@@ -1,3 +0,0 @@
-WORKER_REDIS_HOST=redis
-WORKER_REDIS_PORT=6379
-WORKER_QUEUE_NAME="Ground Floor Printer"

docker/playbook-chd.yml

@@ -21,26 +21,11 @@
         state: present
         source: build
 
-    - name: Build barker worker image
-      docker_image:
-        name: barker-worker:latest
-        build:
-          path: /tmp/app/
-          dockerfile: /tmp/app/worker.Dockerfile
-          pull: yes
-        state: present
-        source: build
-
     - name: Upload the .env file
       template:
         src: "files/chd.env"
         dest: "/var/lib/{{ host_directory }}/.env"
 
-    - name: Upload the worker .env file
-      template:
-        src: "files/chd-worker.env"
-        dest: "/var/lib/{{ host_directory }}/worker.env"
-
     - name: Create barker container
       docker_container:
         name: "{{ host_directory }}"
@@ -56,17 +41,6 @@
         volumes:
           - "/var/lib/{{ host_directory }}/frontend:/frontend"
 
-    - name: Create barker worker container
-      docker_container:
-        name: "{{ host_directory }}-worker"
-        image: barker-worker:latest
-        state: started
-        restart_policy: "unless-stopped"
-        env_file: "/var/lib/{{ host_directory }}/worker.env"
-        links:
-          - "redis:redis"
-
-
     - name: Check if Nginx conf file exists
       stat: path="/etc/nginx/sites-available/{{ http_conf }}"
       register: status

docker/playbook-frank.yml

@@ -0,0 +1,38 @@
+#################################################
+# DO Community Playbooks: Docker
+#################################################
+---
+- hosts: all
+  become: true
+  vars_files:
+    - vars/frank.yml
+
+  tasks:
+    - name: Copy dockerfile
+      synchronize: src=app dest=/tmp
+
+    - name: Build frank image
+      docker_image:
+        name: frank:latest
+        build:
+          path: /tmp/app/
+          dockerfile: /tmp/app/frank.Dockerfile
+          pull: yes
+        state: present
+        source: build
+
+    - name: Upload the worker .env file
+      template:
+        src: "files/frank.env"
+        dest: "/home/pi/frank.env"
+
+    - name: Create frank worker container
+      docker_container:
+        name: "frank"
+        image: frank:latest
+        state: started
+        restart_policy: "unless-stopped"
+        env_file: "/home/pi/frank.env"
+        network_mode: "host"
+        devices:
+          - "{{ printer_port }}:/printer"

docker/playbook-pkl.yml

@@ -21,26 +21,11 @@
         state: present
         source: build
 
-    - name: Build barker worker image
-      docker_image:
-        name: barker-worker:latest
-        build:
-          path: /tmp/app/
-          dockerfile: /tmp/app/worker.Dockerfile
-          pull: yes
-        state: present
-        source: build
-
     - name: Upload the .env file
       template:
         src: "files/pkl.env"
         dest: "/var/lib/{{ host_directory }}/.env"
 
-    - name: Upload the worker .env file
-      template:
-        src: "files/pkl-worker.env"
-        dest: "/var/lib/{{ host_directory }}/worker.env"
-
     - name: Create barker container
       docker_container:
         name: "{{ host_directory }}"
@@ -56,17 +41,6 @@
         volumes:
           - "/var/lib/{{ host_directory }}/frontend:/frontend"
 
-    - name: Create barker worker container
-      docker_container:
-        name: "{{ host_directory }}-worker"
-        image: barker-worker:latest
-        state: started
-        restart_policy: "unless-stopped"
-        env_file: "/var/lib/{{ host_directory }}/worker.env"
-        links:
-          - "redis:redis"
-
-
     - name: Check if Nginx conf file exists
       stat: path="/etc/nginx/sites-available/{{ http_conf }}"
       register: status

docker/vars/frank.yml

@@ -0,0 +1,2 @@
+---
+printer_port: "/dev/usb/lp0"

frank.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+parent_path=$( cd "$(dirname "${BASH_SOURCE[0]}")" || exit ; pwd -P )
+git push
+git tag --delete latest
+git tag latest
+git push --delete origin latest
+git push --tags
+cd "$parent_path/docker" || exit
+ansible-playbook --limit moh1 playbook-frank.yml

frank/config.py

@@ -0,0 +1,16 @@
+from dotenv import load_dotenv
+from pydantic import BaseSettings
+
+
+class Settings(BaseSettings):
+    REDIS_HOST: str = "127.0.0.1"
+    REDIS_PORT: int = 6379
+    QUEUE_NAME: str = "arq:queue"
+
+    class Config:
+        case_sensitive = True
+        env_file = ".env"
+
+
+load_dotenv()
+settings = Settings()

frank/printing.py

@@ -0,0 +1,38 @@
+import re  # noqa: F401
+import socket  # noqa: F401
+import sys  # noqa: F401
+
+from arq import Retry
+
+
+async def sent_to_printer(ctx: dict, data: str, address: str, cut_code: str):
+    address = "/printer"
+    try:
+        print("Printing to :", address, "\n", data, "\n")
+        with open(address, "w") as printer:
+            printer.write(data)
+            printer.write("\n")
+            print(cut_code)
+            printer.write(cut_code)
+    except LookupError as e:
+        print("Lookup error:", e)
+        raise Retry(defer=ctx["job_try"] * 30)
+    except FileNotFoundError as e:
+        print("File not found error:", e)
+        raise Retry(defer=ctx["job_try"] * 30)
+    except:  # noqa: E722
+        print("Unexpected error:", sys.exc_info()[0])
+        # retry the job with increasing back-off
+        # delays will be 5s, 10s, 15s, 20s
+        # after max_tries (default 5) the job will permanently fail
+        raise Retry(defer=ctx["job_try"] * 30)
+
+    # GS = "\x1d"
+    # PAPER_CUT = GS + "V"
+    # # For the printer ESC/POS Reference
+    # # https://reference.epson-biz.com/modules/ref_escpos/index.php?content_id=87
+    # # The m codes are in decimal and can be converted using the following table
+    # # https://www.eso.org/~ndelmott/ascii.html
+    # # The \x03 in all the following is to feed 3 lines before cut it can be increased or reduced
+    # FUNCTION_B_FULL_CUT = "\x41\x03"
+    # FUNCTION_B_PARTIAL_CUT = "\x42\x03"

frank/pyproject.toml

@@ -0,0 +1,15 @@
+[tool.poetry]
+name = "frank"
+version = "7.3.0"
+description = "Point of Sale for a restaurant"
+authors = ["tanshu <git@tanshu.com>"]
+
+[tool.poetry.dependencies]
+python = "^3.8"
+pydantic = {extras = ["dotenv"], version = "^1.8.1"}
+arq = "^0.19.1"
+aiohttp = "^3.7.4"
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"

frank/settings.py

@@ -0,0 +1,4 @@
+from arq.connections import RedisSettings
+from config import settings as sett
+
+settings = RedisSettings(host=sett.REDIS_HOST, port=sett.REDIS_PORT)

frank/worker-start.sh

@@ -0,0 +1,5 @@
+#! /usr/bin/env bash
+set -e
+
+echo arq worker.WorkerSettings
+arq worker.WorkerSettings

frank/worker.py

@@ -0,0 +1,30 @@
+import sys
+
+from aiohttp import ClientSession
+from config import settings as sett
+from printing import sent_to_printer
+from settings import settings
+
+sys.path.extend(["./"])
+
+
+async def startup(ctx):
+    ctx["session"] = ClientSession()
+    print(f"Worker listening for: {sett.QUEUE_NAME}")
+    # print(f"Worker printing on: {sett.WORKER_PRINTER_ADDRESS}")
+
+
+async def shutdown(ctx):
+    await ctx["session"].close()
+
+
+class WorkerSettings:
+    """
+    Settings for the ARQ worker.
+    """
+
+    queue_name = f"barker:print:{sett.QUEUE_NAME}"
+    redis_settings = settings
+    functions: list = [sent_to_printer]
+    on_startup = startup
+    on_shutdown = shutdown