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Dart SDK

面向 Flutter 与 Dart 应用的客户端：纯 Dart 实现，没有运行时依赖，提供与其他客户端相同的事件、功能开关和收件箱。

发布位置

prodantix_sdk on pub.dev. Pure Dart, with no runtime dependencies.

安装

Bash
dart pub add prodantix_sdk

示例

Dart
import 'package:prodantix_sdk/prodantix_sdk.dart';

const projectKey = String.fromEnvironment('PRODANTIX_PUBLIC_KEY');

final client = ProdantixClient(
  apiKey: projectKey,
  host: 'https://eu.api.prodantix.com',
);

client.identify('user-123');
client.capture('order.completed', properties: {'total': 42});

final inbox = await client.getInbox();
await client.shutdown();
这个客户端会记住是谁在使用它，因此 identify 只设置一次用户 id，之后的每次调用都关于那个人。退出登录时请调用 reset。

远程与本地开关

远程判断向服务端提问，结果具有权威性。本地判断则在进程内对缓存的规则快照求值，每次调用都不必往返，这正是热路径所需要的。

Dart
// Remote: asks the server, and is the authoritative answer.
if (await client.isFeatureEnabled('new-checkout')) {
  // ...
}

// Local: evaluated in process from a cached snapshot, no round trip per call.
if (await client.isFeatureEnabledLocal('new-checkout', properties: {'plan': 'pro'})) {
  // ...
}

// Every per-flag read records one $feature_flag_called exposure.
final variant = await client.getVariant('new-checkout');
if (variant?['key'] == 'treatment') {
  // ...
}

// A flag targeting a cohort reads this user's memberships from the store;
// pass them yourself to skip the lookup.
if (await client.isFeatureEnabledLocal('members', cohorts: ['<cohort id>'])) {
  // ...
}

它在哪里运行

它面向移动端和 Dart VM，通过 dart:io 访问网络。在其他任何平台上，传入你自己的 Transport 和 Requester 即可，客户端的其余部分毫无变化。

Dart
final client = ProdantixClient(
  apiKey: projectKey,
  host: 'https://eu.api.prodantix.com',
  transport: MyTransport(),
  requester: myRequester,
  // Hold a Socket.IO subscription to flag changes and refetch the snapshot on
  // push, instead of waiting for the 30s poll.
  streamFlags: true,
);