From bda39348e0feb61a94d88d8582d6e33bce24f4be Mon Sep 17 00:00:00 2001
From: SandroMaglione <lass.maglio@gmail.com>
Date: Mon, 18 Mar 2024 17:41:37 +0900
Subject: [PATCH] http request example

---
 examples/fpdart_http/lib/api.dart        | 30 ++++++++++++++++++++++++
 examples/fpdart_http/lib/http_error.dart | 11 +++++++++
 examples/fpdart_http/lib/main.dart       | 18 ++++++++++++++
 examples/fpdart_http/pubspec.yaml        | 19 +++++++++++++++
 4 files changed, 78 insertions(+)
 create mode 100644 examples/fpdart_http/lib/api.dart
 create mode 100644 examples/fpdart_http/lib/http_error.dart
 create mode 100644 examples/fpdart_http/lib/main.dart
 create mode 100644 examples/fpdart_http/pubspec.yaml

diff --git a/examples/fpdart_http/lib/api.dart b/examples/fpdart_http/lib/api.dart
new file mode 100644
index 0000000..73ed164
--- /dev/null
+++ b/examples/fpdart_http/lib/api.dart
@@ -0,0 +1,30 @@
+import 'package:fpdart/fpdart.dart';
+import 'package:http/http.dart' as http;
+
+import 'http_error.dart';
+
+/// 1️⃣ Define dependencies, errors, response
+Effect<http.Client, HttpError, http.Response> get(
+  Uri url, {
+  Map<String, String>? headers,
+}) =>
+
+    /// 2️⃣ Use the Do notation with the `gen` constructor
+    Effect.gen((_) async {
+      /// 3️⃣ Extract the dependency using `env` (environment)
+      final client = await _(Effect.env());
+
+      /// 4️⃣ Perform a request, catch errors, extract the response
+      final response = await _(Effect.tryCatch(
+        execute: () => client.get(url, headers: headers),
+        onError: (_, __) => const RequestError(),
+      ));
+
+      /// 5️⃣ Use plain dart code to check for valid status
+      if (response.statusCode != 200) {
+        return await _(Effect.fail(const ResponseError()));
+      }
+
+      /// 6️⃣ Return extracted/valid response
+      return response;
+    });
diff --git a/examples/fpdart_http/lib/http_error.dart b/examples/fpdart_http/lib/http_error.dart
new file mode 100644
index 0000000..c7f9391
--- /dev/null
+++ b/examples/fpdart_http/lib/http_error.dart
@@ -0,0 +1,11 @@
+sealed class HttpError {
+  const HttpError();
+}
+
+final class RequestError extends HttpError {
+  const RequestError();
+}
+
+final class ResponseError extends HttpError {
+  const ResponseError();
+}
diff --git a/examples/fpdart_http/lib/main.dart b/examples/fpdart_http/lib/main.dart
new file mode 100644
index 0000000..ce8caf5
--- /dev/null
+++ b/examples/fpdart_http/lib/main.dart
@@ -0,0 +1,18 @@
+import 'package:fpdart/fpdart.dart';
+import 'package:http/http.dart' as http;
+
+import 'api.dart';
+
+void main() async {
+  final main = await get(
+    Uri.https("pokeapi.co", "/api/v2/pokemon/10"),
+  )
+      .tap(
+        (response) => Effect.function(
+          () => print(response.body),
+        ),
+      )
+      .runFuture(
+        http.Client(),
+      );
+}
diff --git a/examples/fpdart_http/pubspec.yaml b/examples/fpdart_http/pubspec.yaml
new file mode 100644
index 0000000..3862015
--- /dev/null
+++ b/examples/fpdart_http/pubspec.yaml
@@ -0,0 +1,19 @@
+name: fpdart_http
+description: >
+  Example of using fpdart with http.
+version: 2.0.0
+homepage: https://www.sandromaglione.com/
+repository: https://github.com/SandroMaglione/fpdart
+publish_to: "none"
+
+environment:
+  sdk: ">=3.3.0 <4.0.0"
+
+dependencies:
+  http: ^1.2.1
+  fpdart:
+    path: ../../packages/fpdart
+
+dev_dependencies:
+  lints: ^2.0.1
+  test: ^1.23.1