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client.go
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client.go
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package client
import (
"context"
"encoding/json"
"fmt"
"net/http"
"sync"
"time"
)
type Client struct {
username, password string
httpClient *http.Client
}
func New(username, password string, timeout time.Duration) *Client {
return &Client{
username: username,
password: password,
httpClient: &http.Client{Timeout: timeout},
}
}
func (c *Client) MakeGETRequest(ctx context.Context, url string, queryString map[string]string, data interface{}) error {
req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
if err != nil {
return fmt.Errorf("can't create request %q: %w", url, err)
}
if queryString != nil {
q := req.URL.Query()
for k, v := range queryString {
q.Add(k, v)
}
req.URL.RawQuery = q.Encode()
}
req.SetBasicAuth(c.username, c.password)
resp, err := c.httpClient.Do(req)
if err != nil {
return fmt.Errorf("request failed: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return fmt.Errorf("request failed %q: %s", url, resp.Status)
}
err = json.NewDecoder(resp.Body).Decode(&data)
if err != nil {
return fmt.Errorf("can't read json %q: %w", url, err)
}
return nil
}
type KeyGetter interface {
GetByKey(ctx context.Context, key string) (interface{}, error)
}
func (c *Client) BulkKeyRequests(ctx context.Context, getter KeyGetter, keys []string) ([]interface{}, error) {
var wg sync.WaitGroup
var errs []error
var results []interface{}
wg.Add(len(keys))
var mu sync.Mutex
setResult := func(data interface{}, err error) {
mu.Lock()
if err != nil {
errs = append(errs, err)
} else {
results = append(results, data)
}
mu.Unlock()
}
for _, key := range keys {
go func(key string) {
defer wg.Done()
defer func() {
if err := recover(); err != nil {
setResult(nil, fmt.Errorf("panic while getting %s: %v", key, err))
}
}()
setResult(getter.GetByKey(ctx, key))
}(key)
}
wg.Wait()
var err error
if len(errs) != 0 {
err = fmt.Errorf("can't get data: %v", errs)
}
return results, err
}