The start of a web service to write NFC tags

MoonrakerWebClient.py

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+#!/usr/bin/env python3
+
+# SPDX-FileCopyrightText: 2024 Sebastian Andersson <[email protected]>
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+"""Moonraker Web Client"""
+
+import requests
+
+class MoonrakerWebClient:
+    """Moonraker Web Client"""
+
+    def __init__(self, url : str):
+        self.url = url
+
+
+    def set_spool_and_filament(spool: int, filament: int):
+        """Calls moonraker with the current spool & filament"""
+
+        commands = {
+            "commands": [
+                f"SET_ACTIVE_SPOOL ID={spool}",
+                f"SET_ACTIVE_FILAMENT ID={filament}",
+            ]
+        }
+
+        response = requests.post(
+            self.url + "/api/printer/command", timeout=10, json=commands
+        )
+        if response.status_code != 200:
+            raise ValueError(f"Request to moonraker failed: {response}")

SpoolmanClient.py

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+#!/usr/bin/env python3
+
+# SPDX-FileCopyrightText: 2024 Sebastian Andersson <[email protected]>
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+"""Spoolman client"""
+
+import json
+import requests
+
+class SpoolmanClient:
+    """ Spoolman Web Client """
+
+    def __init__(self, url : str):
+        if url.endswith("/"):
+            url = url[:-1]
+        self.url = url
+
+    def record_to_text(record):
+        """Translate a json spool object to a readable string"""
+        return f"#{record['id']} {record['filament']['vendor']['name']} - {record['filament']['name']}"
+
+
+    def get_spools(self):
+        """ Get the spools from spoolman """
+        url = self.url + "/api/v1/spool"
+        response = requests.get(url, timeout=10)
+        if response.status_code != 200:
+            raise ValueError(f"Request to spoolman failed: {response}")
+        records = json.loads(response.text)
+        return records

nfc2klipper_with_webservice-config.json5

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+{
+    /// The address the web server listens to,
+    /// use 0.0.0.0 for all IPv4
+    "web_address": "0.0.0.0",
+
+    /// The port the web server listens to
+    "web_port": 5001,
+
+    /// Clear the spool & filament info if no tag can be read
+    "clear-spool": false,
+
+    /// Which NFC reader to use, see
+    /// https://nfcpy.readthedocs.io/en/latest/topics/get-started.html#open-a-local-device
+    "nfc-device": "ttyAMA0",
+
+    /// URL for the moonraker installation
+    "moonraker-url": "http://mainsailos.local",
+
+    /// URL for the moonraker installation
+    "spoolman-url": "http://mainsailos.local:7912",
+}

nfc2klipper_with_webservice.py

@@ -0,0 +1,172 @@
+#!/usr/bin/env python3
+
+# SPDX-FileCopyrightText: 2024 Sebastian Andersson <[email protected]>
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+"""Program to set current filament & spool in klipper."""
+
+from flask import Flask, render_template
+import json5
+import nfc
+import requests
+from SpoolmanClient import SpoolmanClient
+
+SPOOL = "SPOOL"
+FILAMENT = "FILAMENT"
+NDEF_TEXT_TYPE = "urn:nfc:wkt:T"
+
+with open("nfc2klipper_with_webservice-config.json5", "r", encoding="utf-8") as fp:
+    args = json5.load(fp)
+
+spoolman = SpoolmanClient(args['spoolman-url'])
+
+app = Flask(__name__)
+
+
+def set_spool_and_filament(url: str, spool: int, filament: int):
+    """Calls moonraker with the current spool & filament"""
+
+    if "old_spool" not in set_spool_and_filament.__dict__:
+        set_spool_and_filament.old_spool = None
+        set_spool_and_filament.old_filament = None
+
+    if (
+        set_spool_and_filament.old_spool == spool
+        and set_spool_and_filament.old_filament == filament
+    ):
+        print("Read same spool & filament", flush=True)
+        return
+
+    print(f"Sending spool #{spool}, filament #{filament} to klipper", flush=True)
+
+    commands = {
+        "commands": [
+            f"SET_ACTIVE_SPOOL ID={spool}",
+            f"SET_ACTIVE_FILAMENT ID={filament}",
+        ]
+    }
+
+    # In case the post fails, we might not know if the server has received
+    # it or not, so set them to None:
+    set_spool_and_filament.old_spool = None
+    set_spool_and_filament.old_filament = None
+
+    try:
+        response = requests.post(
+            url + "/api/printer/command", timeout=10, json=commands
+        )
+        if response.status_code != 200:
+            raise ValueError(f"Request to moonraker failed: {response}")
+    except Exception as ex:  # pylint: disable=W0718
+        print(ex)
+
+    set_spool_and_filament.old_spool = spool
+    set_spool_and_filament.old_filament = filament
+
+
+def get_data_from_ndef_records(records):
+    """Find wanted data from the NDEF records.
+
+    >>> import ndef
+    >>> record0 = ndef.TextRecord("")
+    >>> record1 = ndef.TextRecord("SPOOL:23\\n")
+    >>> record2 = ndef.TextRecord("FILAMENT:14\\n")
+    >>> record3 = ndef.TextRecord("SPOOL:23\\nFILAMENT:14\\n")
+    >>> get_data_from_ndef_records([record0])
+    (None, None)
+    >>> get_data_from_ndef_records([record3])
+    ('23', '14')
+    >>> get_data_from_ndef_records([record1])
+    ('23', None)
+    >>> get_data_from_ndef_records([record2])
+    (None, '14')
+    >>> get_data_from_ndef_records([record0, record3])
+    ('23', '14')
+    >>> get_data_from_ndef_records([record3, record0])
+    ('23', '14')
+    >>> get_data_from_ndef_records([record1, record2])
+    ('23', '14')
+    >>> get_data_from_ndef_records([record2, record1])
+    ('23', '14')
+    """
+
+    spool = None
+    filament = None
+
+    for record in records:
+        if record.type == NDEF_TEXT_TYPE:
+            for line in record.text.splitlines():
+                line = line.split(":")
+                if len(line) == 2:
+                    if line[0] == SPOOL:
+                        spool = line[1]
+                    if line[0] == FILAMENT:
+                        filament = line[1]
+        else:
+            print(f"Read other record: {record}", flush=True)
+
+    return spool, filament
+
+
+def on_nfc_connect(tag):
+    """Handles a read tag"""
+
+    if tag.ndef is None:
+        print("The tag doesn't have NDEF records", flush=True)
+        return True
+
+    spool, filament = get_data_from_ndef_records(tag.ndef.records)
+
+    if not args.get("clear_spool"):
+        if not (spool and filament):
+            print("Did not find spool and filament records in tag", flush=True)
+    if args.get("clear_spool") or (spool and filament):
+        if not spool:
+            spool = 0
+        if not filament:
+            filament = 0
+        set_spool_and_filament(args["moonraker_url"], spool, filament)
+
+    # Don't let connect return until the tag is removed:
+    return True
+
+
+@app.route("/w/<int:spool>/<int:filament>")
+def write_tag(spool, filament):
+    """
+    The web-api to write the spool & filament data to NFC/RFID tag
+    """
+    import time
+
+    print(f"  write spool={spool}, filament={filament}")
+    time.sleep(5)
+    if filament > 1:
+        return "Didn't find NFC tag", 503  # Service Unavailable
+    return "OK"
+
+
+@app.route("/")
+def index():
+    """
+    Returns the main index page.
+    """
+    spools = spoolman.get_spools()
+
+    return render_template("index.html", spools=spools)
+
+app.run(args["web_address"], port=args["web_port"])
+
+if __name__ == "__main2__":
+
+    # Open NFC reader. Will throw an exception if it fails.
+    clf = nfc.ContactlessFrontend(args["nfc_device"])
+
+    if args.get("clear_spool"):
+        # Start by unsetting current spool & filament:
+        set_spool_and_filament(args["moonraker_url"], 0, 0)
+
+    while True:
+        clf.connect(rdwr={"on-connect": on_nfc_connect})
+        # No tag connected anymore.
+        if args.get("clear_spool"):
+            set_spool_and_filament(args["moonraker_url"], 0, 0)

requirements.txt

@@ -1,3 +1,5 @@
+flask==3.0.3
+json5==0.9.25
 nfcpy==1.0.4
-requests==2.31.0
 npyscreen==4.10.5
+requests==2.31.0

templates/index.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
+  <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
+
+  <title> NFC2Klipper </title>
+</head>
+<script>
+function x(spool, filament) {
+    document.getElementById("status").textContent = "Writing to NFC..." 
+    fetch("/w/" + spool + "/" + filament)
+        .then((result) => {
+            if (!result.ok) {
+                result.text().then((text) => {
+                    document.getElementById("status").textContent = "Failed to write to NFC tag: " + text;
+                });
+                throw new Error("Could not write tag");
+            }
+            return result.text();
+        })
+        .then((text) => {
+            document.getElementById("status").textContent = "Wrote to NFC tag";
+        })
+        .catch((error) => {
+            console.error("Failed to request NFC writing:", error);
+        });
+    return false;
+}
+</script>
+<body>
+<h1> NFC22Klipper </h1>
+<div id="status">&nbsp;</div>
+<ul>
+  {% for spool in spools %}
+  <li>
+    <a onclick="x({{spool['id']}}, {{spool['filament']['id']}})" href="#">[write]</a>
+    {{spool['id']}}: {{spool['filament']['vendor']['name']}} - {{spool['filament']['name']}}
+  </li>
+  {% endfor %}
+</ul>
+</body>
+</html>