mirror of
https://github.com/ethereum/go-ethereum.git
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93 lines
2.8 KiB
Go
93 lines
2.8 KiB
Go
// Copyright 2023 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// go-ethereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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package ethtest
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"net/http"
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"time"
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"github.com/ethereum/go-ethereum/beacon/engine"
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"github.com/ethereum/go-ethereum/common"
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"github.com/golang-jwt/jwt/v4"
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)
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// EngineClient is a wrapper around engine-related data.
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type EngineClient struct {
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url string
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jwt [32]byte
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chain *Chain
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http *http.Client
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}
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// NewEngineClient creates a new engine client.
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func NewEngineClient(url, jwtSecret string, chain *Chain) *EngineClient {
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return &EngineClient{
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url: url,
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jwt: common.HexToHash(jwtSecret),
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chain: chain,
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http: &http.Client{Timeout: 10 * time.Second},
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}
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}
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// token returns the jwt claim token for authorization.
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func (ec *EngineClient) token() string {
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claims := jwt.RegisteredClaims{IssuedAt: jwt.NewNumericDate(time.Now())}
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token, _ := jwt.NewWithClaims(jwt.SigningMethodHS256, claims).SignedString(ec.jwt[:])
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return token
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}
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// rpcRequest marshals a JSON-RPC 2.0 request body for the given method and params.
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func rpcRequest(method string, params ...any) ([]byte, error) {
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p, err := json.Marshal(params)
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if err != nil {
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return nil, err
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}
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return fmt.Appendf(nil, `{"jsonrpc":"2.0","id":1,"method":%q,"params":%s}`, method, p), nil
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}
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// call sends an authenticated Engine API JSON-RPC request. Response body is
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// not inspected — only transport errors are returned.
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func (ec *EngineClient) call(method string, params ...any) error {
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body, err := rpcRequest(method, params...)
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if err != nil {
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return err
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}
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req, err := http.NewRequest(http.MethodPost, ec.url, bytes.NewReader(body))
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if err != nil {
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return err
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}
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req.Header.Set("accept", "application/json")
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req.Header.Set("content-type", "application/json")
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req.Header.Set("Authorization", "Bearer "+ec.token())
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_, err = ec.http.Do(req)
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return err
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}
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// sendForkchoiceUpdated sends an fcu for the head of the generated chain.
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func (ec *EngineClient) sendForkchoiceUpdated() error {
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head := ec.chain.Head().Hash()
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state := engine.ForkchoiceStateV1{
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HeadBlockHash: head,
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SafeBlockHash: head,
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FinalizedBlockHash: head,
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}
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return ec.call("engine_forkchoiceUpdatedV3", state, nil)
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}
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