Initial commit

backend/app/data/database.py

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+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+
+SQLALCHEMY_DATABASE_URL = "sqlite:///./scanner.db"
+
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False}
+)
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+Base = declarative_base()

backend/app/data/models.py

@@ -0,0 +1 @@
+from .database import Base

backend/app/data/schemas.py

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+from pydantic import BaseModel
+import app.scanner.enums as scan
+
+class ScanPage(BaseModel):
+    filename: str
+    size_bytes: int
+
+    class Config():
+        orm_mode = True
+
+class ScanStatus(BaseModel):
+    pages: list[ScanPage]
+    status: scan.Status

backend/app/main.py

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+import threading
+from contextlib import asynccontextmanager
+from typing import Annotated
+
+from fastapi import FastAPI, Depends
+
+from app.data import models
+from app.data.database import SessionLocal, engine
+
+from app.scanner.scanner import Scanner
+from app.scanner.scanner import Status as ScannerStatus
+
+models.Base.metadata.create_all(bind=engine)
+
+__scanner = Scanner("/var/www/html/img")
+
+@asynccontextmanager
+async def __lifespan(app: FastAPI):
+    threading.Thread(target=__scanner.preload).start()
+    yield
+
+app = FastAPI(lifespan=__lifespan)
+
+# SQLAlchemiy session dependency
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+def get_scanner():
+    return __scanner
+
+from app.routers import power
+app.include_router(power.router)
+
+from app.routers import scan
+app.include_router(scan.router)
+
+@app.get("/api/ready")
+async def __ready(scanner: Annotated[Scanner, Depends(get_scanner)]):
+    return scanner.get_status() != ScannerStatus.INITIALIZED

backend/app/routers/power.py

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+from fastapi import APIRouter
+import subprocess
+
+router = APIRouter(prefix="/api/power")
+
+@router.post("/shutdown")
+async def power_shutdown():
+    subprocess.call(["sudo", "shutdown", "-h", "now"])
+    return {}
+
+@router.post("/restart")
+async def power_restart():
+    subprocess.call(["sudo", "reboot"])
+    return {}

backend/app/routers/scan.py

@@ -0,0 +1,23 @@
+from typing import Annotated
+
+from app.scanner.scanner import Scanner
+from app.main import get_scanner
+
+from fastapi import APIRouter, Depends
+from app.data import schemas, models
+
+router = APIRouter(prefix="/api/scan")
+
+@router.post("")
+async def scan(scanner: Annotated[Scanner, Depends(get_scanner)]):
+    scanner.scan()
+    return []
+
+@router.get("/status", response_model=schemas.ScanStatus)
+async def status(scanner: Annotated[Scanner, Depends(get_scanner)]):
+    pages = [schemas.ScanPage.from_orm(page) for page in scanner.get_pages()]
+    return schemas.ScanStatus(pages=pages,status=scanner.get_status())
+
+@router.get("/debug")
+async def debug(scanner: Annotated[Scanner, Depends(get_scanner)]):
+    return scanner.get_options()

backend/app/scanner/enums.py

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+from enum import Enum
+
+class Status(Enum):
+    INITIALIZED = "initialized"
+    IDLE = "idle"
+    RUNNING = "running"
+    DONE = "done"
+    ERR_NO_PAPER = "err_no_paper"
+    ERR_COVER_OPEN = "err_cover_open"
+
+class Setting(Enum):
+    PAPER_SOURCE = "source"
+    COLOR_MODE = "color"
+    RESOLUTION = "resolution"
+    PAPER_SIZE = "paper_size"
+
+class PaperSize(Enum):
+    A3 = "a3"
+    B3 = "b3"
+    A4 = "a4"
+    B4 = "b4"
+    LETTER = "letter"

backend/app/scanner/scanner.py

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+import gi, os, threading
+from typing import List
+
+from PIL import Image
+from app.scanner.enums import Status
+
+gi.require_version('Libinsane', '1.0')
+from gi.repository import Libinsane, GObject # type: ignore
+
+class __LibinsaneSilentLogger(GObject.GObject, Libinsane.Logger):
+    def do_log(self, lvl, msg):
+        return
+    
+Libinsane.register_logger(__LibinsaneSilentLogger())
+
+class Page:
+    filename: str
+    size_bytes: int
+
+class Scanner:
+
+    def __get_device_id(self):
+        """
+        List local scanners and get the device id of the first found device.
+
+        :param self: Instance of this class
+        :returns: Device id of the first scan device
+        """
+        devs = self.api.list_devices(Libinsane.DeviceLocations.LOCAL_ONLY)
+        return devs[0].get_dev_id()
+
+    def __raw_to_img(self, params, img_bytes):
+        """
+        
+        """
+        fmt = params.get_format()
+        assert(fmt == Libinsane.ImgFormat.RAW_RGB_24)
+        (w, h) = (
+            params.get_width(),
+            int(len(img_bytes) / 3 / params.get_width())
+        )
+        return Image.frombuffer("RGB", (w, h), img_bytes, "raw", "RGB", 0, 1)
+
+    def __write_file(self, scan_params, data, page_index, last_file):
+        data = b"".join(data)
+        if scan_params.get_format() == Libinsane.ImgFormat.RAW_RGB_24:
+            filesize = len(data)
+            img = self.__raw_to_img(scan_params, data)
+            filename = f"out{page_index}.png"
+            img.save(os.path.join(self.storage_path, filename), format="PNG")
+            page = Page()
+            page.filename = filename
+            page.size_bytes = filesize
+            self.scanned_pages.append(page)
+        if last_file:
+            self.status = Status.DONE
+
+    def __set_defaults(self):
+        dev = self.api.get_device(self.device_id)
+        opts = dev.get_options()
+        opts = {opt.get_name(): opt for opt in opts}
+        opts["sleeptimer"].set_value(1)
+        opts["resolution"].set_value(200)
+        dev.close()
+
+    def __scan(self):
+        self.status = Status.RUNNING
+        source = self.api.get_device(self.device_id)
+
+        opts = source.get_options()
+        opts = {opt.get_name(): opt for opt in opts}
+        if opts["cover-open"].get_value() == True:
+            self.status = Status.ERR_COVER_OPEN
+            return
+        
+        session = source.scan_start()
+        try:
+            page_index = 0
+            while not session.end_of_feed() and page_index < 50:
+                # Do not assume that all the pages will have the same size !
+                scan_params = session.get_scan_parameters()
+                img = []
+                while not session.end_of_page():
+                    data = session.read_bytes(256 * 1024)
+                    data = data.get_data()
+                    img.append(data)
+                t = threading.Thread(target=self.__write_file, args=(scan_params, img, page_index, session.end_of_feed()))
+                t.start()
+                page_index += 1
+            if page_index == 0:
+                self.status = Status.ERR_NO_PAPER
+        finally:
+            session.cancel()
+            source.close()
+    
+    def __init__(self, storage_path):
+        self.scanned_pages: List[Page] = []
+        self.storage_path = storage_path
+        self.status = Status.INITIALIZED
+
+    def preload(self):
+        os.environ["LIBINSANE_NORMALIZER_SAFE_DEFAULTS"] = "0"
+        self.api = Libinsane.Api.new_safebet()
+        self.device_id = self.__get_device_id()
+        self.__set_defaults()
+        self.status = Status.IDLE
+
+    def scan(self):
+        if self.status == Status.RUNNING:
+            raise RuntimeError("already_running")
+        if self.status == Status.INITIALIZED:
+            self.preload()
+        self.scanned_pages: List[Page] = []
+        t = threading.Thread(target=self.__scan)
+        t.start()
+
+    def get_status(self) -> Status:
+        return self.status
+    
+    def get_pages(self) -> List[Page]:
+        return self.scanned_pages
+    
+    def get_options(self):
+        dev = self.api.get_device(self.device_id)
+        opts = dev.get_options()
+        result = {}
+        for opt in opts:
+            try:
+                result[opt.get_name()] = opt.get_value()
+            except Exception:
+                continue
+        dev.close()
+        return result
+    
+    def cleanup(self):
+        if self.status == Status.RUNNING:
+            raise RuntimeError("scan_running")
+        if self.status != Status.INITIALIZED:
+            self.api.cleanup()
+