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package comms
import (
"fmt"
"net/http"
"strings"
"bytes"
"io/ioutil"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/rpc/codec"
"github.com/ethereum/go-ethereum/rpc/shared"
"github.com/rs/cors"
)
var (
// main HTTP rpc listener
httpListener *stoppableTCPListener
listenerStoppedError = fmt.Errorf("Listener has stopped")
)
type HttpConfig struct {
ListenAddress string
ListenPort uint
CorsDomain string
}
func StartHttp(cfg HttpConfig, codec codec.Codec, api shared.EthereumApi) error {
if httpListener != nil {
if fmt.Sprintf("%s:%d", cfg.ListenAddress, cfg.ListenPort) != httpListener.Addr().String() {
return fmt.Errorf("RPC service already running on %s ", httpListener.Addr().String())
}
return nil // RPC service already running on given host/port
}
l, err := newStoppableTCPListener(fmt.Sprintf("%s:%d", cfg.ListenAddress, cfg.ListenPort))
if err != nil {
glog.V(logger.Error).Infof("Can't listen on %s:%d: %v", cfg.ListenAddress, cfg.ListenPort, err)
return err
}
httpListener = l
var handler http.Handler
if len(cfg.CorsDomain) > 0 {
var opts cors.Options
opts.AllowedMethods = []string{"POST"}
opts.AllowedOrigins = strings.Split(cfg.CorsDomain, " ")
c := cors.New(opts)
handler = newStoppableHandler(c.Handler(gethHttpHandler(codec, api)), l.stop)
} else {
handler = newStoppableHandler(gethHttpHandler(codec, api), l.stop)
}
go http.Serve(l, handler)
return nil
}
func StopHttp() {
if httpListener != nil {
httpListener.Stop()
httpListener = nil
}
}
type httpClient struct {
address string
port uint
codec codec.ApiCoder
lastRes interface{}
lastErr error
}
// Create a new in process client
func NewHttpClient(cfg HttpConfig, c codec.Codec) *httpClient {
return &httpClient{
address: cfg.ListenAddress,
port: cfg.ListenPort,
codec: c.New(nil),
}
}
func (self *httpClient) Close() {
// do nothing
}
func (self *httpClient) Send(req interface{}) error {
var body []byte
var err error
self.lastRes = nil
self.lastErr = nil
if body, err = self.codec.Encode(req); err != nil {
return err
}
httpReq, err := http.NewRequest("POST", fmt.Sprintf("%s:%d", self.address, self.port), bytes.NewBuffer(body))
if err != nil {
return err
}
httpReq.Header.Set("Content-Type", "application/json")
client := http.Client{}
resp, err := client.Do(httpReq)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.Status == "200 OK" {
reply, _ := ioutil.ReadAll(resp.Body)
var rpcSuccessResponse shared.SuccessResponse
if err = self.codec.Decode(reply, &rpcSuccessResponse); err == nil {
self.lastRes = rpcSuccessResponse.Result
self.lastErr = err
return nil
} else {
var rpcErrorResponse shared.ErrorResponse
if err = self.codec.Decode(reply, &rpcErrorResponse); err == nil {
self.lastRes = rpcErrorResponse.Error
self.lastErr = err
return nil
} else {
return err
}
}
}
return fmt.Errorf("Not implemented")
}
func (self *httpClient) Recv() (interface{}, error) {
return self.lastRes, self.lastErr
}
func (self *httpClient) SupportedModules() (map[string]string, error) {
var body []byte
var err error
payload := shared.Request{
Id: 1,
Jsonrpc: "2.0",
Method: "modules",
}
if body, err = self.codec.Encode(payload); err != nil {
return nil, err
}
req, err := http.NewRequest("POST", fmt.Sprintf("%s:%d", self.address, self.port), bytes.NewBuffer(body))
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/json")
client := http.Client{}
resp, err := client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.Status == "200 OK" {
reply, _ := ioutil.ReadAll(resp.Body)
var rpcRes shared.SuccessResponse
if err = self.codec.Decode(reply, &rpcRes); err != nil {
return nil, err
}
result := make(map[string]string)
if modules, ok := rpcRes.Result.(map[string]interface{}); ok {
for a, v := range modules {
result[a] = fmt.Sprintf("%s", v)
}
return result, nil
}
err = fmt.Errorf("Unable to parse module response - %v", rpcRes.Result)
} else {
fmt.Printf("resp.Status = %s\n", resp.Status)
fmt.Printf("err = %v\n", err)
}
return nil, err
}
|
