mirror of
https://github.com/IBM/fp-go.git
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158 lines
3.7 KiB
Go
158 lines
3.7 KiB
Go
// Copyright (c) 2023 IBM Corp.
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// All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package http
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import (
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"context"
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"fmt"
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"testing"
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H "net/http"
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R "github.com/IBM/fp-go/context/readerioeither"
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E "github.com/IBM/fp-go/either"
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"github.com/IBM/fp-go/errors"
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F "github.com/IBM/fp-go/function"
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IOE "github.com/IBM/fp-go/ioeither"
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"github.com/stretchr/testify/assert"
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)
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type PostItem struct {
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UserID uint `json:"userId"`
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Id uint `json:"id"`
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Title string `json:"title"`
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Body string `json:"body"`
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}
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func getTitle(item PostItem) string {
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return item.Title
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}
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type simpleRequestBuilder struct {
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method string
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url string
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headers H.Header
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}
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func requestBuilder() simpleRequestBuilder {
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return simpleRequestBuilder{method: "GET"}
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}
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func (b simpleRequestBuilder) WithURL(url string) simpleRequestBuilder {
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b.url = url
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return b
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}
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func (b simpleRequestBuilder) WithHeader(key, value string) simpleRequestBuilder {
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if b.headers == nil {
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b.headers = make(H.Header)
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} else {
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b.headers = b.headers.Clone()
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}
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b.headers.Set(key, value)
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return b
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}
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func (b simpleRequestBuilder) Build() R.ReaderIOEither[*H.Request] {
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return func(ctx context.Context) IOE.IOEither[error, *H.Request] {
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return IOE.TryCatchError(func() (*H.Request, error) {
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req, err := H.NewRequestWithContext(ctx, b.method, b.url, nil)
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if err == nil {
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req.Header = b.headers
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}
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return req, err
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})
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}
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}
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func TestSendSingleRequest(t *testing.T) {
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client := MakeClient(H.DefaultClient)
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req1 := MakeGetRequest("https://jsonplaceholder.typicode.com/posts/1")
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readItem := ReadJSON[PostItem](client)
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resp1 := readItem(req1)
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resE := resp1(context.TODO())()
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fmt.Println(resE)
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}
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// setHeaderUnsafe updates a header value in a request object by mutating the request object
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func setHeaderUnsafe(key, value string) func(*H.Request) *H.Request {
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return func(req *H.Request) *H.Request {
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req.Header.Set(key, value)
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return req
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}
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}
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func TestSendSingleRequestWithHeaderUnsafe(t *testing.T) {
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client := MakeClient(H.DefaultClient)
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// this is not safe from a puristic perspective, because the map call mutates the request object
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req1 := F.Pipe2(
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"https://jsonplaceholder.typicode.com/posts/1",
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MakeGetRequest,
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R.Map(setHeaderUnsafe("Content-Type", "text/html")),
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)
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readItem := ReadJSON[PostItem](client)
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resp1 := F.Pipe2(
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req1,
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readItem,
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R.Map(getTitle),
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)
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res := F.Pipe1(
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resp1(context.TODO())(),
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E.GetOrElse(errors.ToString),
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)
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assert.Equal(t, "sunt aut facere repellat provident occaecati excepturi optio reprehenderit", res)
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}
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func TestSendSingleRequestWithHeaderSafe(t *testing.T) {
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client := MakeClient(H.DefaultClient)
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// the request builder assembles config values to construct
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// the final http request. Each `With` step creates a copy of the settings
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// so the flow is pure
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request := requestBuilder().
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WithURL("https://jsonplaceholder.typicode.com/posts/1").
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WithHeader("Content-Type", "text/html").
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Build()
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readItem := ReadJSON[PostItem](client)
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response := F.Pipe2(
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request,
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readItem,
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R.Map(getTitle),
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)
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res := F.Pipe1(
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response(context.TODO())(),
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E.GetOrElse(errors.ToString),
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)
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assert.Equal(t, "sunt aut facere repellat provident occaecati excepturi optio reprehenderit", res)
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}
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