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/*
Package internal unimportable
*/
package internal // import "github.com/SevereCloud/vksdk/v2/internal"
import (
"context"
"net/http"
"github.com/SevereCloud/vksdk/v2"
)
// UserAgent module.
const UserAgent = "vksdk/" + vksdk.Version + " (+https://github.com/SevereCloud/vksdk)"
// ContextKey is just an empty struct. It exists so HTTPClient can be
// an immutable public variable with a unique type. It's immutable
// because nobody else can create a ContextKey, being unexported.
type ContextKey int
// ContextKey list.
const (
HTTPClientKey ContextKey = iota
UserAgentKey
GroupIDKey
EventIDKey
LongPollTsKey
CallbackRetryCounterKey
CallbackRetryAfterKey
CallbackRemove
)
// ContextClient return *http.Client.
func ContextClient(ctx context.Context) *http.Client {
if ctx != nil {
if hc, ok := ctx.Value(HTTPClientKey).(*http.Client); ok {
return hc
}
}
return http.DefaultClient
}
// ContextUserAgent return User-Agent from context.
func ContextUserAgent(ctx context.Context) string {
if ctx != nil {
if hc, ok := ctx.Value(UserAgentKey).(string); ok {
return hc
}
}
return UserAgent
}
// DoRequest sends an HTTP request and returns an HTTP response.
//
// The provided ctx must be non-nil. If it is canceled or times out,
// ctx.Err() will be returned.
func DoRequest(ctx context.Context, req *http.Request) (*http.Response, error) {
client := ContextClient(ctx)
if req.UserAgent() == "" {
req.Header.Set("User-Agent", ContextUserAgent(ctx))
}
resp, err := client.Do(req.WithContext(ctx))
// If we got an error, and the context has been canceled,
// the context's error is probably more useful.
if err != nil {
<-ctx.Done()
err = ctx.Err()
}
return resp, err
}
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