client.go

/*
Copyright © 2021 Thomas Meitz

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

Parts of this apiclient are borrowed from Zalando Skipper
https://github.com/zalando/skipper/blob/master/net/httpclient.go

Zalando licence: MIT
https://github.com/zalando/skipper/blob/master/LICENSE
*/

package net

import (
	"encoding/base64"
	"fmt"
	"io"
	"net/http"
	"net/url"
	"time"

	"github.com/Masterminds/log-go"

	"github.com/DinoShambar/ksqldb-go/internal"
)

const (
	DefaultIdleConnTimeout = 10 * time.Second
	DefaultBaseUrl         = "http://localhost:8088"
)

// NewClient(Options, log.Logger) (*Client, error)

type HTTPClientFactory interface {
	NewHTTPClient(options Options, logger log.Logger) (*Client, error)
}

type HTTPClient interface {
	GetUrl(endpoint string) string
	Do(*http.Request) (*http.Response, error)
	Get(url string) (*http.Response, error)
	Post(url, contentType string, body io.Reader) (*http.Response, error)
	Close()
}

// The ksqlDB client
type Client struct {
	options Options
	uri     *url.URL
	client  http.Client
	tr      *Transport
	logger  log.Logger
}

// Credentials holds the username and password
type Credentials struct {
	Username string `json:"username" mapstructure:"username"`
	Password string `json:"password" mapstructure:"password"`
}

func NewHTTPClient(options Options, logger log.Logger) (Client, error) {
	var uri *url.URL
	var err error
	var cl = Client{}

	if options.BaseUrl == "" {
		options.BaseUrl = DefaultBaseUrl
	}

	options.BasicAuthToken = base64.StdEncoding.EncodeToString([]byte(options.Credentials.Username + ":" + options.Credentials.Password))

	if uri, err = internal.GetUrl(options.BaseUrl); err != nil {
		return cl, fmt.Errorf("%+w", err)
	}

	tr := NewTransport(options)

	//if logger == nil {
	//	logger = log.Default()
	//}

	return Client{
		logger: logger,
		client: http.Client{
			Transport: tr,
		},
		options: options,
		tr:      tr,
		uri:     uri,
	}, nil
}

func (c *Client) Close() {
	c.tr.Close()
}

// Do delegates the given http.Request to the underlying http.Client
func (c *Client) Do(req *http.Request) (*http.Response, error) {
	req.Header.Set("Authorization", "Basic "+c.options.BasicAuthToken)
	return c.client.Do(req)
}

func (c *Client) Get(url string) (*http.Response, error) {
	req, err := http.NewRequest("GET", url, nil)
	if err != nil {
		return nil, err
	}
	return c.Do(req)
}

func (c *Client) GetUrl(endpoint string) string {
	return c.options.BaseUrl + endpoint
}

func (c *Client) Post(url, contentType string, body io.Reader) (*http.Response, error) {
	req, err := http.NewRequest("POST", url, body)
	if err != nil {
		return nil, err
	}
	req.Header.Set("Content-Type", contentType)
	return c.Do(req)
}