emissary/internal/client/client.go

package client

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"net/http"

	"github.com/pkg/errors"
	"gitlab.com/wpetit/goweb/api"
	"gitlab.com/wpetit/goweb/logger"
)

type Client struct {
	http      *http.Client
	token     string
	serverURL string
}

func (c *Client) apiGet(ctx context.Context, path string, result any) error {
	if err := c.apiDo(ctx, http.MethodGet, path, nil, result); err != nil {
		return errors.WithStack(err)
	}

	return nil
}

func (c *Client) apiPost(ctx context.Context, path string, payload any, result any) error {
	if err := c.apiDo(ctx, http.MethodPost, path, payload, result); err != nil {
		return errors.WithStack(err)
	}

	return nil
}

func (c *Client) apiPut(ctx context.Context, path string, payload any, result any) error {
	if err := c.apiDo(ctx, http.MethodPut, path, payload, result); err != nil {
		return errors.WithStack(err)
	}

	return nil
}

func (c *Client) apiDelete(ctx context.Context, path string, payload any, result any) error {
	if err := c.apiDo(ctx, http.MethodDelete, path, payload, result); err != nil {
		return errors.WithStack(err)
	}

	return nil
}

func (c *Client) apiDo(ctx context.Context, method string, path string, payload any, response any) error {
	url := c.serverURL + path

	logger.Debug(
		ctx, "new http request",
		logger.F("method", method),
		logger.F("url", url),
		logger.F("payload", payload),
	)

	var buf bytes.Buffer

	encoder := json.NewEncoder(&buf)

	if err := encoder.Encode(payload); err != nil {
		return errors.WithStack(err)
	}

	req, err := http.NewRequest(method, url, &buf)
	if err != nil {
		return errors.WithStack(err)
	}

	res, err := c.http.Do(req)
	if err != nil {
		return errors.WithStack(err)
	}

	defer res.Body.Close()

	decoder := json.NewDecoder(res.Body)

	if err := decoder.Decode(&response); err != nil {
		return errors.WithStack(err)
	}

	return nil
}

func withResponse[T any]() struct {
	Data  T
	Error *api.Error
} {
	return struct {
		Data  T
		Error *api.Error
	}{}
}

func joinSlice[T any](items []T) string {
	str := ""

	for idx, item := range items {
		if idx != 0 {
			str += ","
		}

		str += fmt.Sprintf("%v", item)
	}

	return str
}

func New(serverURL string) *Client {
	return &Client{
		serverURL: serverURL,
		http:      &http.Client{},
	}
}