在 Heroku 上使用 Vapor 3 配置 PostgreSQL DB

Question

我已经构建了一个简单的Vapor 3 API，我想将其部署在Heroku上。我希望它由PostgreSQL数据库支持，该数据库也附加到另一个Heroku应用程序(我已经成功地在Heroku仪表板中附加了数据库 - 并且数据库在其他应用程序中正常工作(。但是，我的 Vapor 应用程序从未完成启动，崩溃并显示以下错误：

Fatal error: Error raised at top level: ⚠️ PostgreSQL Error: no pg_hba.conf entry for host "[the IP addr]", user "[heroku postgres username here]", database "[heroku psql db here]", SSL off
- id: PostgreSQLError.server.fatal.ClientAuthentication

我用vapor heroku init来设置Heroku应用程序。我已经用谷歌搜索过，并尝试添加一个Procfile并弄乱configure.swift，但到目前为止没有运气。以下是我能想到的所有相关文件：

文件：

web: Run serve --env production --hostname 0.0.0.0 --port $PORT --config:postgresql.url $DATABASE_URL

配置.swift：

import FluentPostgreSQL
import Vapor
/// Called before your application initializes.
public func configure(_ config: inout Config, _ env: inout Environment, _ services: inout Services) throws {
/// Register providers first
try services.register(FluentPostgreSQLProvider())
var contentConfig = ContentConfig.default()
/// Create custom JSON encoder
let jsonEncoder = JSONEncoder()
if #available(OSX 10.12, *) {
jsonEncoder.dateEncodingStrategy = .iso8601
} else {
jsonEncoder.dateEncodingStrategy = .millisecondsSince1970
}
//    jsonEncoder.keyEncodingStrategy = .convertToSnakeCase
/// Register JSON encoder and content config
contentConfig.use(encoder: jsonEncoder, for: .json)
services.register(contentConfig)
/// Register routes to the router
let router = EngineRouter.default()
try routes(router)
services.register(router, as: Router.self)
/// Register middleware
var middlewares = MiddlewareConfig() // Create _empty_ middleware config
/// middlewares.use(FileMiddleware.self) // Serves files from `Public/` directory
middlewares.use(ErrorMiddleware.self) // Catches errors and converts to HTTP response
services.register(middlewares)
// Configure a database
let dbConfig: PostgreSQLDatabaseConfig
if let url = Environment.get("DATABASE_URL"), let psqlConfig = PostgreSQLDatabaseConfig(url: url) {
dbConfig = psqlConfig
} else {
dbConfig = PostgreSQLDatabaseConfig(hostname: "localhost", port: 5432, username: "admin", database: "development", password: nil)
}
let postgresql = try PostgreSQLDatabase(config: dbConfig)
/// Register the configured SQLite database to the database config.
var databases = DatabasesConfig()
databases.add(database: postgresql, as: .psql)
services.register(databases)
/// Configure migrations
var migrations = MigrationConfig()
migrations.add(model: Visit.self, database: .psql)
services.register(migrations)
}

包装.swift：

// swift-tools-version:4.0
import PackageDescription
let package = Package(
name: "SubwayNyc",
dependencies: [
// 💧 A server-side Swift web framework.
.package(url: "https://github.com/vapor/vapor.git", from: "3.0.0"),
// 🔵 Swift ORM (queries, models, relations, etc) built on PostgreSQL.
.package(url: "https://github.com/vapor/fluent-postgresql.git", from: "1.0.0"),
.package(url: "https://github.com/vapor/sql.git", from: "2.1.0")
],
targets: [
.target(name: "App", dependencies: ["FluentPostgreSQL", "Vapor"]),
.target(name: "Run", dependencies: ["App"]),
.testTarget(name: "AppTests", dependencies: ["App"])
]
)

如何让PostgreSQL连接到Heroku上的Vapor 3应用程序？

Answer 1

对于 Heroku，我们需要未经验证的 TLS 传输。

https://api.vapor.codes/postgresql/latest/PostgreSQL/Classes/PostgreSQLConnection/TransportConfig.html

let pgURL = Environment.get("DATABASE_URL") ?? "postgres://user:password@host:port/database"
let pgConfig = PostgreSQLDatabaseConfig(url: pgURL, transport: PostgreSQLConnection.TransportConfig.unverifiedTLS)!

:D

Answer 2

原始错误是这里的关键，特别是：SSL off.

当客户端尝试在没有 SSL 的情况下连接时，Heroku Postgres 会引发此错误。我自己不熟悉 Vapor，但快速浏览一下就会发现 configure.swift 是您可以进行配置更改的地方。从客户端启用 SSL 后，您应该能够毫无问题地连接到此数据库实例。