我在const functions = require('firebase-functions');
const admin = require("firebase-admin");
const cors = require('cors')({origin: true});
const zlib = require('zlib');
exports.backup = functions.https.onRequest((request, response) => {
cors(request, response, async () => {
const db = admin.database();
const ref_deb = db.ref("/");
ref_deb.once('value').then(function (snapshot) {
console.log("Database value " + snapshot.val());
let jsonFileContent = snapshot.val();
if (jsonFileContent != null) {
//console.log(io);
console.log("getCompressedJSONFile function started", jsonFileContent);
let bufferObject = new Buffer.from(JSON.stringify(jsonFileContent));
zlib.gzip(bufferObject, function (err, zippedData) {
if (err) {
console.log("error in gzip compression using zlib module", err);
response.send("Error").status(500);
} else {
console.log("zippedData", zippedData);
response.send(zippedData).status(200);
}
})
} else {
response.send("Error").status(500)
}
}, function (error) {
console.error(error);
});
});
});
文件中定义了一个变量：
.env在以下LOCAL_IP=127.0.0.1
中使用它时，我可以看到通过运行docker-compose.yml将变量扩展为127.0.0.1。
docker-compose.yml
docker-compose config现在，我想在同一文件的另一个变量中引用services:
my-service:
environment:
# This gets expanded to http://127.0.0.1/services
SERVICE_ENDPOINT: http://${LOCAL_IP}/services
的值，例如：
LOCAL_IP更新了docker-compose.yml
LOCAL_IP=127.0.0.1
SOME_OTHER_VAR=$LOCAL_IP
运行services:
my-service:
environment:
SERVICE_ENDPOINT: http://${SOME_OTHER_VAR}/services
然后给我：
docker-compose config