Official Go implementation of the Ethereum protocol
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go-ethereum/rpc/client_opt.go

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// Copyright 2022 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package rpc
import (
"net/http"
"github.com/gorilla/websocket"
)
// ClientOption is a configuration option for the RPC client.
type ClientOption interface {
applyOption(*clientConfig)
}
type clientConfig struct {
// HTTP settings
httpClient *http.Client
httpHeaders http.Header
httpAuth HTTPAuth
// WebSocket options
wsDialer *websocket.Dialer
wsMessageSizeLimit *int64 // wsMessageSizeLimit nil = default, 0 = no limit
// RPC handler options
idgen func() ID
batchItemLimit int
batchResponseLimit int
}
func (cfg *clientConfig) initHeaders() {
if cfg.httpHeaders == nil {
cfg.httpHeaders = make(http.Header)
}
}
func (cfg *clientConfig) setHeader(key, value string) {
cfg.initHeaders()
cfg.httpHeaders.Set(key, value)
}
type optionFunc func(*clientConfig)
func (fn optionFunc) applyOption(opt *clientConfig) {
fn(opt)
}
// WithWebsocketDialer configures the websocket.Dialer used by the RPC client.
func WithWebsocketDialer(dialer websocket.Dialer) ClientOption {
return optionFunc(func(cfg *clientConfig) {
cfg.wsDialer = &dialer
})
}
// WithWebsocketMessageSizeLimit configures the websocket message size limit used by the RPC
// client. Passing a limit of 0 means no limit.
func WithWebsocketMessageSizeLimit(messageSizeLimit int64) ClientOption {
return optionFunc(func(cfg *clientConfig) {
cfg.wsMessageSizeLimit = &messageSizeLimit
})
}
// WithHeader configures HTTP headers set by the RPC client. Headers set using this option
// will be used for both HTTP and WebSocket connections.
func WithHeader(key, value string) ClientOption {
return optionFunc(func(cfg *clientConfig) {
cfg.initHeaders()
cfg.httpHeaders.Set(key, value)
})
}
// WithHeaders configures HTTP headers set by the RPC client. Headers set using this
// option will be used for both HTTP and WebSocket connections.
func WithHeaders(headers http.Header) ClientOption {
return optionFunc(func(cfg *clientConfig) {
cfg.initHeaders()
for k, vs := range headers {
cfg.httpHeaders[k] = vs
}
})
}
// WithHTTPClient configures the http.Client used by the RPC client.
func WithHTTPClient(c *http.Client) ClientOption {
return optionFunc(func(cfg *clientConfig) {
cfg.httpClient = c
})
}
// WithHTTPAuth configures HTTP request authentication. The given provider will be called
// whenever a request is made. Note that only one authentication provider can be active at
// any time.
func WithHTTPAuth(a HTTPAuth) ClientOption {
if a == nil {
panic("nil auth")
}
return optionFunc(func(cfg *clientConfig) {
cfg.httpAuth = a
})
}
// A HTTPAuth function is called by the client whenever a HTTP request is sent.
// The function must be safe for concurrent use.
//
// Usually, HTTPAuth functions will call h.Set("authorization", "...") to add
// auth information to the request.
type HTTPAuth func(h http.Header) error
// WithBatchItemLimit changes the maximum number of items allowed in batch requests.
//
// Note: this option applies when processing incoming batch requests. It does not affect
// batch requests sent by the client.
func WithBatchItemLimit(limit int) ClientOption {
return optionFunc(func(cfg *clientConfig) {
cfg.batchItemLimit = limit
})
}
// WithBatchResponseSizeLimit changes the maximum number of response bytes that can be
// generated for batch requests. When this limit is reached, further calls in the batch
// will not be processed.
//
// Note: this option applies when processing incoming batch requests. It does not affect
// batch requests sent by the client.
func WithBatchResponseSizeLimit(sizeLimit int) ClientOption {
return optionFunc(func(cfg *clientConfig) {
cfg.batchResponseLimit = sizeLimit
})
}