fairwind/http_client.go

package fairwind

import (
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"net/http"
	"strings"
)

type HTTPClientRequest struct {
	Data     string
	Object   any
	Encoding int
}

type HTTPCLientResponse struct {
	Raw      []byte
	Object   any
	Encoding int
}

type HTTPClient struct {
	scheme string
	host   string
	port   uint
}

func NewHTTPClient(scheme string, host string, port uint) *HTTPClient {
	return &HTTPClient{
		scheme: scheme,
		host:   host,
		port:   port,
	}
}

func (this *HTTPClient) Request(method int, path string, headers HTTPHeaders, request *HTTPClientRequest, response *HTTPCLientResponse) error {
	buffer, err := json.Marshal(request.Object)
	if err != nil {
		return err
	}

	var requestInternal *http.Request
	if method == METHOD_GET {
		requestInternal, err = http.NewRequest(
			"GET",
			fmt.Sprintf("%s://%s:%d/%s", this.scheme, this.host, this.port, path),
			nil,
		)
	}

	if method == METHOD_POST {
		requestInternal, err = http.NewRequest(
			"POST",
			fmt.Sprintf("%s://%s:%d/%s", this.scheme, this.host, this.port, path),
			bytes.NewBuffer(buffer),
		)
	}

	if err != nil {
		return err
	}

	for key, value := range headers {
		requestInternal.Header.Add(key, value)
	}

	client := &http.Client{}
	responseInternal, err := client.Do(requestInternal)
	if err != nil {
		return err
	}
	if responseInternal.StatusCode != http.StatusOK {
		return fmt.Errorf("invalid status = %d", responseInternal.StatusCode)
	}

	buffer, err = io.ReadAll(responseInternal.Body)
	if err != nil {
		return err
	}

	contentTypeHeader := responseInternal.Header.Get("Content-Type")
	if contentTypeHeader == "" {
		return errors.New("content-type not specified")
	}

	var contentType string
	if contentTypeHeader == "text/plain" || contentTypeHeader == "application/octet-stream" {
		contentType = contentTypeHeader
	} else {
		parts := strings.Split(contentTypeHeader, ";")
		if len(parts) != 2 {
			return errors.New("content-type invalid")
		}

		contentType = parts[0]
	}

	switch contentType {
	case "text/plain":
	case "application/octet-stream":
		response.Raw = buffer
	case "application/json":
		err = json.Unmarshal(buffer, response.Object)
		if err != nil {
			return err
		}
	}

	return nil
}