AWS 區塊鏈服務為HTTP和WebSocket協議提供端點，但需要 IAM 簽名驗證才能使用它們。要使用 HTTP 端點，我只需通過 AWS SDK在http.RoundTripper接口中對其進行簽名。但是，如果我需要使用WebSocket端點，由于go-ethereum的限制，我只能通過rpc.DialWebsocketWithDialer傳入一個websocket.Dialer結構，這意味著我無法通過實現接口來解決這個問題。如何將 AWS 區塊鏈服務的 WebSocket 端點與 go-ethereum 結合使用？
1 回答
精慕HU
TA貢獻1845條經驗 獲得超8個贊
通過閱讀github.com/gorilla/websocket 的源代碼，我發現函數中有一個邏輯(*Dialer) DialContext將 http.Request 指針傳遞給可定制的函數，這意味著我可以編寫一個與forProxy做同樣事情的函數http.RoundTripper注入標頭。
WebSocket
package transport
import (
"context"
"crypto/sha256"
"encoding/hex"
"net/http"
"net/url"
"time"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/aws/signer/v4"
"github.com/gorilla/websocket"
)
func NewWebSocketDialer(config aws.Config) (*websocket.Dialer, error) {
return &websocket.Dialer{
HandshakeTimeout: 45 * time.Second,
Proxy: func(request *http.Request) (*url.URL, error) {
credentials, err := config.Credentials.Retrieve(request.Context())
if err != nil {
return nil, err
}
// Because AWS may sign some unrelated headers and cause authentication failure, you need to create a blank request.
internalRequest, err := http.NewRequest(http.MethodGet, request.URL.String(), nil)
if err != nil {
return nil, err
}
header := request.Header.Clone()
hash := sha256.New()
signer := v4.NewSigner()
if err := signer.SignHTTP(context.Background(), credentials, internalRequest, hex.EncodeToString(hash.Sum(nil)), "managedblockchain", config.Region, time.Now()); err != nil {
return nil, err
}
request.Header = internalRequest.Header
request.Header.Set("Connection", header["Connection"][0])
request.Header.Set("Sec-WebSocket-Key", header["Sec-WebSocket-Key"][0])
request.Header.Set("Sec-WebSocket-Version", header["Sec-WebSocket-Version"][0])
request.Header.Set("Upgrade", header["Upgrade"][0])
return http.ProxyFromEnvironment(request)
},
}, nil
}
HTTP
package transport
import (
"compress/gzip"
"context"
"crypto/sha256"
"encoding/base64"
"encoding/hex"
"io"
"net/http"
"time"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/aws/signer/v4"
)
var _ http.RoundTripper = &httpRoundTripper{}
type httpRoundTripper struct {
config aws.Config
}
func (h httpRoundTripper) RoundTrip(request *http.Request) (*http.Response, error) {
credentials, err := h.config.Credentials.Retrieve(request.Context())
if err != nil {
return nil, err
}
internalRequest := request.Clone(request.Context())
bodyReader, err := request.GetBody()
if err != nil {
return nil, err
}
hash := sha256.New()
if _, err := io.Copy(hash, bodyReader); err != nil {
return nil, err
}
signer := v4.NewSigner()
if err := signer.SignHTTP(context.Background(), credentials, internalRequest, hex.EncodeToString(hash.Sum(nil)), "managedblockchain", h.config.Region, time.Now()); err != nil {
return nil, err
}
response, err := h.config.HTTPClient.Do(internalRequest)
if err != nil {
return nil, err
}
if response.Header.Get("Content-Type") == "gzip" {
gzipReader, err := gzip.NewReader(base64.NewDecoder(base64.StdEncoding, response.Body))
if err != nil {
return nil, err
}
request.Header.Set("Content-Type", "application/json")
response.Body = gzipReader
}
return response, nil
}
func NewHttpRoundTripper(cfg aws.Config) http.RoundTripper {
return httpRoundTripper{
config: cfg,
}
}
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