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