YANG JIANKUAN
b32007483a
mDNS(.local)域名解析基于组播UDP，偶发丢包会导致整轮推送直接抛异常跳过。 _request() 对连接类异常加重试(2次/间隔2s)；画廊清理列表拉取失败也不再 阻塞后续 /upload，清理是锦上添花而非推送必要条件。 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
63 lines
2.3 KiB
Python
63 lines
2.3 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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推送层 —— 直连局域网墨水屏设备（喵喵固件，仅用标准库 urllib，无第三方依赖）。
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固件开源：https://gitee.com/gxp666111/miaomiao（web/ 为设备自带管理页，可在浏览器打开
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http://<EPD_HOST>/ 调试同一套接口）。
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"""
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import json
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import time
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import urllib.parse
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import urllib.request
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import urllib.error
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import config
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# 局域网 mDNS（.local）域名解析基于组播 UDP，偶发瞬时失败正常，重试即可恢复。
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RETRY_TIMES = 2
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RETRY_DELAY = 2
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def _request(method, path, headers=None, body=None):
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url = f"http://{config.EPD_HOST}{path}"
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req = urllib.request.Request(url, data=body, headers=headers or {}, method=method)
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for attempt in range(RETRY_TIMES + 1):
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try:
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with urllib.request.urlopen(req, timeout=30) as resp:
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return resp.read().decode("utf-8", "ignore")
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except urllib.error.HTTPError as e:
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raise RuntimeError(f"HTTP {e.code}: {e.read().decode('utf-8', 'ignore')}") from e
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except urllib.error.URLError:
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if attempt == RETRY_TIMES:
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raise
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time.sleep(RETRY_DELAY)
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def _list_gallery_names():
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text = _request("GET", "/images")
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return [item["name"] for item in json.loads(text).get("items", [])]
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def _clear_gallery():
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"""设备画廊按追加保存，用完即删，使其始终只留最新一张。
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清理是锦上添花，不是推送的必要条件——拉列表或单张删除失败都不能阻塞后续上传。"""
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try:
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names = _list_gallery_names()
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except Exception as e:
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print(f"[推送] 拉取画廊列表失败，跳过本次清理：{e}")
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return
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for name in names:
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try:
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_request("POST", f"/delete_image?name={urllib.parse.quote(name)}")
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except Exception as e:
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print(f"[推送] 清理画廊旧图 {name} 失败：{e}")
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def push_image(image_path):
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"""推送图片到局域网墨水屏设备：先清空画廊旧图，再上传新图触发显示刷新。"""
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_clear_gallery()
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with open(image_path, "rb") as fp:
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content = fp.read()
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resp = _request("POST", "/upload", headers={"Content-Type": "image/png"}, body=content)
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return config.EPD_HOST, resp
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