/
server.dart
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/
server.dart
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import "dart:core";
import "dart:io";
import 'dart:async' show Future;
import 'dart:convert';
import 'dart:math' show Random;
import "package:start/start.dart";
import "package:args/args.dart";
import 'package:postgresql/postgresql.dart' as pg;
import 'package:postgresql/postgresql_pool.dart' as pgpool;
import 'package:yaml/yaml.dart' as yaml;
import 'package:mustache/mustache.dart' as mustache;
import 'package:mongo_dart/mongo_dart.dart';
import 'package:crypto/crypto.dart';
// Postgres connection pool
var _connectionPool;
// Fortunes mustache template
var _fortunesTemplate;
// MongoDB connection
var _mongoDb;
// World Collection
var _worldCollection;
// Fortunes Collection
var _fortuneCollection;
// World table size
const _WORLD_TABLE_SIZE = 10000;
// Fortune table size used only for generation of data
const _FORTUNE_TABLE_SIZE = 100;
final _RANDOM = new Random();
class Fortune implements Comparable<Fortune> {
int id;
String message;
Fortune(this.id, this.message);
compareTo(Fortune other) => message.compareTo(other.message);
}
class World {
int id;
int randomnumber;
World(this.id, this.randomnumber);
toJson() => { "id": id, "randomNumber": randomnumber };
}
main(List<String> args) {
var parser = new ArgParser();
parser.addOption('address', abbr: 'a', defaultsTo: '0.0.0.0');
parser.addOption('port', abbr: 'p', defaultsTo: '8080');
parser.addOption('dbconnections', abbr: 'd', defaultsTo: '256');
var arguments = parser.parse(args);
Future.wait([
new File("postgresql.yaml").readAsString().then((config){
_connectionPool = new pgpool.Pool(
new pg.Settings.fromMap(yaml.loadYaml(config)).toUri(),
min: int.parse(arguments["dbconnections"]),
max: int.parse(arguments["dbconnections"])
);
return _connectionPool.start();
}),
new File("mongodb.yaml").readAsString().then((config) {
var mongoConfig = yaml.loadYaml(config);
_mongoDb = new Db("mongodb://${mongoConfig["host"]}/${mongoConfig["database"]}");
return _mongoDb.open().then((_) {
_worldCollection = _mongoDb.collection("world");
_fortuneCollection = _mongoDb.collection("fortune");
});
}),
new File('fortunes.mustache').readAsString().then((template) {
_fortunesTemplate = mustache.parse(template);
})
]).then((_) {
start(host: arguments["address"], port: int.parse(arguments["port"]))
.then((Server app) {
// JSON test
app.get('/json').listen((request) {
var helloWorld = {
"message": "Hello, World!"
};
_setJsonHeaders(request.response);
request.response.send(JSON.encode(helloWorld));
});
// Query test
app.get("/db").listen((request) {
_setJsonHeaders(request.response);
_query().then((data) {
request.response.send(JSON.encode(data));
});
});
// Queries test
app.get("/queries").listen((request) {
var queries = _parseQueriesParam(request.param("queries"));
_setJsonHeaders(request.response);
Future.wait(
new List.generate(
queries,
(_) => _query(),
growable: false
)
)
.then((response) => request.response.send(JSON.encode(response)));
});
// Fortunes test
app.get("/fortunes").listen((request) {
_setHtmlHeaders(request.response);
_connectionPool.connect().then((connection) {
return connection.query('SELECT id, message FROM fortune;')
.map((row) => new Fortune(row[0], row[1]))
.toList()
.whenComplete(() { connection.close(); });
}).then((fortunes) {
fortunes.add(new Fortune(0, 'Additional fortune added at request time.'));
fortunes.sort();
request.response.send(_fortunesTemplate.renderString({
"fortunes": fortunes.map((fortune) => {
"id": fortune.id,
"message": fortune.message
}).toList()
}));
});
});
// Updates test
app.get("/updates").listen((request) {
var queries = _parseQueriesParam(request.param("queries"));
_setJsonHeaders(request.response);
Future.wait(new List.generate(queries, (_) {
return _query()
.then((world) {
world.randomnumber = _RANDOM.nextInt(_WORLD_TABLE_SIZE) + 1;
return _connectionPool.connect()
.then((connection) {
return connection.execute(
'UPDATE world SET randomnumber = @randomnumber WHERE id = @id;',
{
'randomnumber': world.randomnumber,
'id': world.id
}
)
.whenComplete(() { connection.close(); });
})
.then((_) => world);
});
}, growable: false))
.then((worlds) => request.response.send(JSON.encode(worlds)));
});
// Plain text test
app.get("/plaintext").listen((request) {
_setPlainHeaders(request.response);
request.response.send("Hello, World!");
});
// Mongo World dev data generation
app.get("/generate-world").listen((request) {
_worldCollection.drop()
.then((_) {
var collectionData = new List.generate(_WORLD_TABLE_SIZE, (index) {
return {
"_id": index + 1,
"randomNumber": _RANDOM.nextInt(_WORLD_TABLE_SIZE)
};
});
return _worldCollection.insertAll(collectionData);
})
.then((_) {
request.response.send("Generated");
});
});
// Mongo Fortune dev data generation
app.get("/generate-fortune").listen((request) {
_fortuneCollection.drop()
.then((_) {
var collectionData = new List.generate(_FORTUNE_TABLE_SIZE, (index) {
var hash = new MD5();
hash.add(_RANDOM.nextInt(_FORTUNE_TABLE_SIZE).toString().codeUnits);
return {
"_id": index + 1,
"message": CryptoUtils.bytesToHex(hash.close())
};
});
return _fortuneCollection.insertAll(collectionData);
})
.then((_) {
request.response.send("Generated");
});
});
// Mongo query test
app.get("/db-mongo").listen((request) {
_setJsonHeaders(request.response);
_mongoQuery().then((data) {
request.response.json({
"id": data["_id"],
"randomNumber": data["randomNumber"]
});
});
});
// Mongo queries test
app.get("/queries-mongo").listen((request) {
var queries = _parseQueriesParam(request.param("queries"));
_setJsonHeaders(request.response);
Future.wait(
new List.generate(
queries,
(_) => _mongoQuery(),
growable: false
)
)
.then((response) {
var results = response.map((world) {
return {
"id": world["_id"],
"randomNumber": world["randomNumber"]
};
});
request.response.send(JSON.encode(results.toList()));
});
});
// Mongo updates test
app.get("/updates-mongo").listen((request) {
var queries = _parseQueriesParam(request.param("queries"));
_setJsonHeaders(request.response);
Future.wait(new List.generate(queries, (index) {
return _mongoQuery()
.then((world) {
world["randomNumber"] = _RANDOM.nextInt(_WORLD_TABLE_SIZE);
return _worldCollection.update( { "_id": world["_id"] }, world)
.then((_) => world);
});
}, growable: false))
.then((worlds) {
var result = worlds.map((world) {
return {
"id": world["_id"],
"randomNumber": world["randomNumber"]
};
});
request.response.send(JSON.encode(result.toList()));
});
});
// Mongo fortunes test
app.get("/fortunes-mongo").listen((request) {
_setHtmlHeaders(request.response);
_fortuneCollection.find().toList().then((fortunes) {
fortunes = fortunes.map((fortune) {
return new Fortune(fortune["_id"].toInt(), fortune["message"]);
}).toList();
fortunes.add(new Fortune(0, 'Additional fortune added at request time.'));
fortunes.sort();
request.response.send(_fortunesTemplate.renderString({
"fortunes": fortunes.map((fortune) => {
"id": fortune.id,
"message": fortune.message
}).toList()
}));
});
});
});
});
}
// set JSON headers
_setJsonHeaders(response) {
_setHeaders(response);
response
.header(HttpHeaders.CONTENT_TYPE, 'application/json; charset=UTF-8');
}
// set plain text headers
_setPlainHeaders(response) {
_setHeaders(response);
response
.header(HttpHeaders.CONTENT_TYPE, 'text/plain; charset=UTF-8');
}
// set HTML headers
_setHtmlHeaders(response) {
_setHeaders(response);
response
.header(HttpHeaders.CONTENT_TYPE, 'text/html; charset=UTF-8');
}
// set common headers
_setHeaders(response) {
// disable gzip encoding
response.header(HttpHeaders.CONTENT_ENCODING, "")
..header(HttpHeaders.DATE, new DateTime.now());
}
// parse queries param
_parseQueriesParam(param) {
return param.isEmpty ? 1 : int.parse(param, radix: 10, onError: (_) => 1).clamp(1, 500);
}
// runs a query and returns a promise
_query() {
return _connectionPool.connect().then((connection) {
return connection
.query('SELECT id, randomnumber FROM world WHERE id = @id;', { 'id': _RANDOM.nextInt(_WORLD_TABLE_SIZE) + 1 })
.single
.then((row) =>new World(row[0], row[1]))
.whenComplete(() {
connection.close();
});
});
}
// runs a mongo query and returns a promise
_mongoQuery() {
return _worldCollection.findOne({
"_id": _RANDOM.nextInt(_WORLD_TABLE_SIZE) + 1
});
}