Node.js の Rest で Cloud Firestore のデータを読む (Read)

firestore_read_rest.js

#! /usr/bin/node
// ---------------------------------------------------------------
//	firestore_read_rest.js
//
//					Feb/01/2020
//
// ---------------------------------------------------------------
var fs = require("fs")
var get_token = require('./get_token.js')

// ---------------------------------------------------------------
function row_parser(doc)
{
//	console.log(doc)
	const array_aa = doc.name.split("/")
	const llx = array_aa.length
	const key = array_aa[llx - 1]
	const name = doc.fields.name.stringValue
	const population = doc.fields.population.integerValue
	const date_mod = doc.fields.date_mod.timestampValue
	const str_out = key + "\t" + name + "\t" + population + "\t" + date_mod
	console.log(str_out) 
}

// ---------------------------------------------------------------
console.error ("*** 開始 ***")
const env = process.env
// console.log(env.GOOGLE_APPLICATION_CREDENTIALS)
const json_str = fs.readFileSync (env.GOOGLE_APPLICATION_CREDENTIALS,'utf8')
const dict_aa = JSON.parse (json_str)
const project_id = dict_aa['project_id']
console.log(project_id)

const token = get_token.get_token_proc()

const url="https://firestore.googleapis.com/v1/projects/" + project_id + "/databases/(default)/documents/cities"

var Client = require('node-rest-client').Client

var client = new Client()

var args = {
    headers: { "Authorization": "Bearer " + token}
}

try
	{
	client.get(url, args, function (data, response) {
		try
		{
		data['documents'].forEach((doc) => {
			row_parser(doc)
			})
		}
		catch (error)
		{
		console.error ("*** error *** from forEach ***")
		console.error (error)
		}

		console.error ("*** 終了 ***")
		})
	}
	catch (error)
	{
	console.error ("*** error *** from client.get ***")
	console.error (error)
	}

// ---------------------------------------------------------------

get_token.js はこちら
Node.js の Rest で Cloud Firestore のデータを作成 (Create)

実行コマンド

export NODE_PATH=/usr/lib/node_modules
export GOOGLE_APPLICATION_CREDENTIALS="***.json"
./firestore_read_rest.js