107 lines
3.1 KiB
Go
107 lines
3.1 KiB
Go
// Copyright 2022 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser 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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// The go-ethereum library 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 Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package rpc
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import (
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"net/http"
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"github.com/gorilla/websocket"
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)
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// ClientOption is a configuration option for the RPC client.
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type ClientOption interface {
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applyOption(*clientConfig)
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}
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type clientConfig struct {
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httpClient *http.Client
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httpHeaders http.Header
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httpAuth HTTPAuth
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wsDialer *websocket.Dialer
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}
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func (cfg *clientConfig) initHeaders() {
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if cfg.httpHeaders == nil {
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cfg.httpHeaders = make(http.Header)
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}
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}
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func (cfg *clientConfig) setHeader(key, value string) {
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cfg.initHeaders()
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cfg.httpHeaders.Set(key, value)
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}
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type optionFunc func(*clientConfig)
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func (fn optionFunc) applyOption(opt *clientConfig) {
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fn(opt)
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}
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// WithWebsocketDialer configures the websocket.Dialer used by the RPC client.
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func WithWebsocketDialer(dialer websocket.Dialer) ClientOption {
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return optionFunc(func(cfg *clientConfig) {
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cfg.wsDialer = &dialer
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})
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}
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// WithHeader configures HTTP headers set by the RPC client. Headers set using this option
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// will be used for both HTTP and WebSocket connections.
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func WithHeader(key, value string) ClientOption {
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return optionFunc(func(cfg *clientConfig) {
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cfg.initHeaders()
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cfg.httpHeaders.Set(key, value)
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})
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}
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// WithHeaders configures HTTP headers set by the RPC client. Headers set using this
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// option will be used for both HTTP and WebSocket connections.
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func WithHeaders(headers http.Header) ClientOption {
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return optionFunc(func(cfg *clientConfig) {
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cfg.initHeaders()
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for k, vs := range headers {
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cfg.httpHeaders[k] = vs
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}
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})
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}
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// WithHTTPClient configures the http.Client used by the RPC client.
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func WithHTTPClient(c *http.Client) ClientOption {
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return optionFunc(func(cfg *clientConfig) {
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cfg.httpClient = c
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})
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}
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// WithHTTPAuth configures HTTP request authentication. The given provider will be called
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// whenever a request is made. Note that only one authentication provider can be active at
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// any time.
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func WithHTTPAuth(a HTTPAuth) ClientOption {
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if a == nil {
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panic("nil auth")
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}
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return optionFunc(func(cfg *clientConfig) {
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cfg.httpAuth = a
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})
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}
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// A HTTPAuth function is called by the client whenever a HTTP request is sent.
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// The function must be safe for concurrent use.
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//
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// Usually, HTTPAuth functions will call h.Set("authorization", "...") to add
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// auth information to the request.
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type HTTPAuth func(h http.Header) error
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