Function getTextFromFiles

vision/textDetection.js:183–212

* Given a set of image file paths, extract the text and run them through the * Cloud Vision API. * @param {Index} index The stateful `Index` Object. * @param {string[]} inputFiles The list of files to process. * @returns {Promise }

(index, inputFiles)

 * @returns {Promise<void>}
 */
async function getTextFromFiles(index, inputFiles) {
  // Read all of the given files and provide request objects that will be
  // passed to the Cloud Vision API in a batch request.
  const requests = await Promise.all(
    inputFiles.map(async filename => {
      const content = await fs.readFile(filename);
      console.log(` 👉 ${filename}`);
      return {
        image: {
          content: content.toString('base64'),
        },
        features: [{type: 'TEXT_DETECTION'}],
      };
    })
  );

  // Make a call to the Vision API to detect text
  const results = await client.batchAnnotateImages({requests});
  const detections = results[0].responses;
  await Promise.all(
    inputFiles.map(async (filename, i) => {
      const response = detections[i];
      if (response.error) {
        console.info(`API Error for ${filename}`, response.error);
        return;
      }
      await extractDescriptions(filename, index, response);
    })
  );
}

/**
 * Main entry point for the program.