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// Package client makes requests to a Caesar Cipher Server in order to encode
// and decode messages.
package client
import (
"fmt"
"io"
"net/http"
"sync"
"time"
)
// A CaesarClient handles communication with a server
type CaesarClient struct {
// Endpoint is the URL to which HTTP requests should be made
Endpoint string
c *http.Client
once sync.Once
}
// EncodeMessage asks the Caesar server to encode the supplied message, writes
// the encoded message to the supplied writer, and returns an error in case the
// request fails.
func (c *CaesarClient) EncodeMessage(w io.Writer, r io.Reader) error {
c.once.Do(func() {
c.c = &http.Client{Timeout: 10 * time.Second}
})
req, err := http.NewRequest("POST", c.Endpoint, r)
if err != nil {
return err
}
req.Header.Set("user-agent", "caesar-client/1.0")
resp, err := c.c.Do(req)
if err != nil {
return err
}
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("http status %s", resp.Status)
}
defer resp.Body.Close()
if _, err := io.Copy(w, resp.Body); err != nil {
return err
}
return nil
}
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