github.com/digdeepmining/go-atheios@v1.5.13-0.20180902133602-d5687a2e6f43/swarm/api/http/roundtripper.go (about)

     1  // Copyright 2016 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package http
    18  
    19  import (
    20  	"fmt"
    21  	"net/http"
    22  
    23  	"github.com/atheioschain/go-atheios/logger"
    24  	"github.com/atheioschain/go-atheios/logger/glog"
    25  )
    26  
    27  /*
    28  http roundtripper to register for bzz url scheme
    29  see https://github.com/atheioschain/go-atheios/issues/2040
    30  Usage:
    31  
    32  import (
    33   "github.com/atheioschain/go-atheios/common/httpclient"
    34   "github.com/atheioschain/go-atheios/swarm/api/http"
    35  )
    36  client := httpclient.New()
    37  // for (private) swarm proxy running locally
    38  client.RegisterScheme("bzz", &http.RoundTripper{Port: port})
    39  client.RegisterScheme("bzzi", &http.RoundTripper{Port: port})
    40  client.RegisterScheme("bzzr", &http.RoundTripper{Port: port})
    41  
    42  The port you give the Roundtripper is the port the swarm proxy is listening on.
    43  If Host is left empty, localhost is assumed.
    44  
    45  Using a public gateway, the above few lines gives you the leanest
    46  bzz-scheme aware read-only http client. You really only ever need this
    47  if you need go-native swarm access to bzz addresses.
    48  */
    49  
    50  type RoundTripper struct {
    51  	Host string
    52  	Port string
    53  }
    54  
    55  func (self *RoundTripper) RoundTrip(req *http.Request) (resp *http.Response, err error) {
    56  	host := self.Host
    57  	if len(host) == 0 {
    58  		host = "localhost"
    59  	}
    60  	url := fmt.Sprintf("http://%s:%s/%s:/%s/%s", host, self.Port, req.Proto, req.URL.Host, req.URL.Path)
    61  	glog.V(logger.Info).Infof("roundtripper: proxying request '%s' to '%s'", req.RequestURI, url)
    62  	reqProxy, err := http.NewRequest(req.Method, url, req.Body)
    63  	if err != nil {
    64  		return nil, err
    65  	}
    66  	return http.DefaultClient.Do(reqProxy)
    67  }