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|
package main
import (
"encoding/json"
"fmt"
"net"
"net/http"
"net/url"
"time"
)
type CautiousHTTPClient interface {
Get(string) (*http.Response, error)
GetJSON(string, interface{}) error
}
type cautiousHttpClient struct {
client *http.Client
}
func NewCautiousHTTPClient() CautiousHTTPClient {
// May Need: TLSClientConfig *tls.Config
CautiousTransport := &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: 1 * time.Second,
KeepAlive: 30 * time.Second,
DualStack: true,
}).DialContext,
MaxIdleConns: 100,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 1 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
ResponseHeaderTimeout: 10 * time.Second,
MaxResponseHeaderBytes: 500000, // .5 MB
}
return &cautiousHttpClient{
client: &http.Client{
Transport: CautiousTransport,
Timeout: 30 * time.Second,
},
}
}
func (c *cautiousHttpClient) Get(gurl string) (*http.Response, error) {
u, err := url.Parse(gurl)
if err != nil {
return nil, err
}
// TODO
if u.Scheme != "https" && false {
return nil, fmt.Errorf("URL for GET must be secure")
}
r, err := c.client.Get(u.String())
if err != nil {
return nil, err
}
r.Body = http.MaxBytesReader(nil, r.Body, 1000000)
return r, err
}
func (c *cautiousHttpClient) GetJSON(url string, rv interface{}) error {
r, err := c.Get(url)
if err != nil {
return err
}
defer r.Body.Close()
d := json.NewDecoder(r.Body)
err = d.Decode(rv)
if err != nil {
return err
}
return nil
}
|
