70 lines
2.3 KiB
Go
70 lines
2.3 KiB
Go
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// Copyright 2016 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 http
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import (
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"fmt"
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"net/http"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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)
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/*
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http roundtripper to register for bzz url scheme
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see https://github.com/ethereum/go-ethereum/issues/2040
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Usage:
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import (
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"github.com/ethereum/go-ethereum/common/httpclient"
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"github.com/ethereum/go-ethereum/swarm/api/http"
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)
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client := httpclient.New()
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// for (private) swarm proxy running locally
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client.RegisterScheme("bzz", &http.RoundTripper{Port: port})
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client.RegisterScheme("bzzi", &http.RoundTripper{Port: port})
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client.RegisterScheme("bzzr", &http.RoundTripper{Port: port})
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The port you give the Roundtripper is the port the swarm proxy is listening on.
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If Host is left empty, localhost is assumed.
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Using a public gateway, the above few lines gives you the leanest
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bzz-scheme aware read-only http client. You really only ever need this
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if you need go-native swarm access to bzz addresses, e.g.,
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github.com/ethereum/go-ethereum/common/natspec
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*/
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type RoundTripper struct {
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Host string
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Port string
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}
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func (self *RoundTripper) RoundTrip(req *http.Request) (resp *http.Response, err error) {
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host := self.Host
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if len(host) == 0 {
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host = "localhost"
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}
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url := fmt.Sprintf("http://%s:%s/%s:/%s/%s", host, self.Port, req.Proto, req.URL.Host, req.URL.Path)
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glog.V(logger.Info).Infof("roundtripper: proxying request '%s' to '%s'", req.RequestURI, url)
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reqProxy, err := http.NewRequest(req.Method, url, req.Body)
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if err != nil {
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return nil, err
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}
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return http.DefaultClient.Do(reqProxy)
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}
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