Lambda 函数使用 google-distance-matrix (NodeJS) 返回 null

Question

我需要在 NodeJS Lambda 函数中使用 google-distance-matrix API 计算距离，但在我运行该函数时它只返回 null。

var distance = require('google-distance-matrix');
distance.key('xxxxxxxx');

var origins = ['San Francisco CA'];
var destinations = ['New York NY', '41.8337329,-87.7321554'];

var dist = function() {
    distance.matrix(origins, destinations, function (err, distances) {
        if (!err) {
            return {
                statusCode: 200,
                body: distances
            }
        }
    });
}

exports.handler = async (event) => {
    return dist()
};

Answer 1

您没有正确使用回调，也没有将 distance.matrix 回调中的值返回到 dist 函数中。

你需要做的是：

var distance = require('google-distance-matrix');
distance.key('xxxxxxxx');

var origins = ['San Francisco CA'];
var destinations = ['New York NY', '41.8337329,-87.7321554'];

var dist = function() {
  return new Promise((resolve, reject) => {
      distance.matrix(origins, destinations, function (err, distances) {
        if (err) reject(err);
        resolve({
          statusCode: 200,
          body: distances
        });
      }
    });
  });
}

exports.handler = async (event) => {
    return await dist();
};