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316 lines
10 KiB
Go
316 lines
10 KiB
Go
// Copyright 2015 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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"bufio"
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"bytes"
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"net"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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"time"
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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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"gopkg.in/fatih/set.v0"
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)
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const (
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httpReadDeadLine = 60 * time.Second // wait max httpReadDeadeline for next request
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)
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// httpMessageStream is the glue between a HTTP connection which is message based
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// and the RPC codecs that expect json requests to be read from a stream. It will
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// parse HTTP messages and offer the bodies of these requests as a stream through
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// the Read method. This will require full control of the connection and thus need
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// a "hijacked" HTTP connection.
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type httpMessageStream struct {
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conn net.Conn // TCP connection
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rw *bufio.ReadWriter // buffered where HTTP requests/responses are read/written from/to
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currentReq *http.Request // pending request, codec can pass in a too small buffer for a single read we need to keep track of the current requests if it was not read at once
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payloadBytesRead int64 // number of bytes which are read from the current request
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allowedOrigins *set.Set // allowed CORS domains
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origin string // origin of this connection/request
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}
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// NewHttpMessageStream will create a new http message stream parser that can be
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// used by the codes in the RPC package. It will take full control of the given
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// connection and thus needs to be hijacked. It will read and write HTTP messages
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// from the passed rwbuf. The allowed origins are the RPC CORS domains the user has supplied.
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func NewHTTPMessageStream(c net.Conn, rwbuf *bufio.ReadWriter, initialReq *http.Request, allowdOrigins []string) *httpMessageStream {
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r := &httpMessageStream{conn: c, rw: rwbuf, currentReq: initialReq, allowedOrigins: set.New()}
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for _, origin := range allowdOrigins {
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r.allowedOrigins.Add(origin)
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}
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return r
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}
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// handleOptionsRequest handles the HTTP preflight requests (OPTIONS) that browsers
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// make to enforce CORS rules. Only the POST method is allowed and the origin must
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// be on the rpccorsdomain list the user has specified.
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func (h *httpMessageStream) handleOptionsRequest(req *http.Request) error {
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headers := req.Header
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if !strings.EqualFold(req.Method, "OPTIONS") {
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return fmt.Errorf("preflight aborted: %s!=OPTIONS", req.Method)
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}
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origin := headers.Get("Origin")
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if origin == "" {
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return fmt.Errorf("preflight aborted: empty origin")
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}
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responseHeaders := make(http.Header)
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responseHeaders.Set("Access-Control-Allow-Methods", "POST")
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if h.allowedOrigins.Has(origin) || h.allowedOrigins.Has("*") {
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responseHeaders.Set("Access-Control-Allow-Origin", origin)
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} else {
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glog.V(logger.Info).Infof("origin '%s' not allowed", origin)
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}
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responseHeaders.Set("Access-Control-Allow-Headers", "Content-Type")
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responseHeaders.Set("Date", string(httpTimestamp(time.Now())))
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responseHeaders.Set("Content-Type", "text/plain; charset=utf-8")
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responseHeaders.Set("Content-Length", "0")
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responseHeaders.Set("Vary", "Origin")
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defer h.rw.Flush()
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if _, err := h.rw.WriteString("HTTP/1.1 200 OK\r\n"); err != nil {
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glog.V(logger.Error).Infof("unable to write OPTIONS response: %v\n", err)
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return err
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}
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if err := responseHeaders.Write(h.rw); err != nil {
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glog.V(logger.Error).Infof("unable to write OPTIONS headers: %v\n", err)
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}
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if _, err := h.rw.WriteString("\r\n"); err != nil {
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glog.V(logger.Error).Infof("unable to write OPTIONS response: %v\n", err)
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}
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return nil
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}
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// Read will read incoming HTTP requests and reads the body data from these requests
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// as an endless stream of data.
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func (h *httpMessageStream) Read(buf []byte) (n int, err error) {
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h.conn.SetReadDeadline(time.Now().Add(httpReadDeadLine))
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for {
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// if the last request was read completely try to read the next request
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if h.currentReq == nil {
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if h.currentReq, err = http.ReadRequest(bufio.NewReader(h.rw)); err != nil {
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return 0, err
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}
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}
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// The "options" method is http specific and not interested for the RPC server.
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// Handle it internally and wait for the next request.
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if strings.EqualFold(h.currentReq.Method, "OPTIONS") {
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if err = h.handleOptionsRequest(h.currentReq); err != nil {
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glog.V(logger.Info).Infof("RPC/HTTP OPTIONS error: %v\n", err)
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h.currentReq = nil
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return 0, err
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}
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// processed valid request -> reset deadline
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h.conn.SetReadDeadline(time.Now().Add(httpReadDeadLine))
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h.currentReq = nil
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continue
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}
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if strings.EqualFold(h.currentReq.Method, "GET") || strings.EqualFold(h.currentReq.Method, "POST") {
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n, err := h.currentReq.Body.Read(buf)
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h.payloadBytesRead += int64(n)
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// entire payload read, read new request next time
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if err == io.EOF || h.payloadBytesRead >= h.currentReq.ContentLength {
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h.origin = h.currentReq.Header.Get("origin")
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h.payloadBytesRead = 0
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h.currentReq.Body.Close()
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h.currentReq = nil
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err = nil // io.EOF is not an error
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} else if err != nil {
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// unable to read body
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h.currentReq.Body.Close()
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h.currentReq = nil
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h.payloadBytesRead = 0
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}
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// partial read of body
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return n, err
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}
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return 0, fmt.Errorf("unsupported HTTP method '%s'", h.currentReq.Method)
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}
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}
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// Write will create a HTTP response with the given payload and send it to the peer.
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func (h *httpMessageStream) Write(payload []byte) (int, error) {
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defer h.rw.Flush()
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responseHeaders := make(http.Header)
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responseHeaders.Set("Content-Type", "application/json")
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responseHeaders.Set("Content-Length", strconv.Itoa(len(payload)))
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if h.origin != "" {
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responseHeaders.Set("Access-Control-Allow-Origin", h.origin)
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}
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h.rw.WriteString("HTTP/1.1 200 OK\r\n")
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responseHeaders.Write(h.rw)
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h.rw.WriteString("\r\n")
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return h.rw.Write(payload)
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}
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// Close will close the underlying TCP connection this instance has taken ownership over.
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func (h *httpMessageStream) Close() error {
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h.rw.Flush()
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return h.conn.Close()
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}
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// TimeFormat is the time format to use with time.Parse and time.Time.Format when
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// parsing or generating times in HTTP headers. It is like time.RFC1123 but hard
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// codes GMT as the time zone.
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const TimeFormat = "Mon, 02 Jan 2006 15:04:05 GMT"
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// httpTimestamp formats the given t as specified in RFC1123.
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func httpTimestamp(t time.Time) []byte {
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const days = "SunMonTueWedThuFriSat"
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const months = "JanFebMarAprMayJunJulAugSepOctNovDec"
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b := make([]byte, 0)
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t = t.UTC()
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yy, mm, dd := t.Date()
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hh, mn, ss := t.Clock()
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day := days[3*t.Weekday():]
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mon := months[3*(mm-1):]
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return append(b,
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day[0], day[1], day[2], ',', ' ',
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byte('0'+dd/10), byte('0'+dd%10), ' ',
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mon[0], mon[1], mon[2], ' ',
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byte('0'+yy/1000), byte('0'+(yy/100)%10), byte('0'+(yy/10)%10), byte('0'+yy%10), ' ',
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byte('0'+hh/10), byte('0'+hh%10), ':',
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byte('0'+mn/10), byte('0'+mn%10), ':',
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byte('0'+ss/10), byte('0'+ss%10), ' ',
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'G', 'M', 'T')
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}
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// httpConnHijacker is a http.Handler implementation that will hijack the HTTP
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// connection, wraps it in a HttpMessageStream that is then wrapped in a JSON
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// codec which will be served on the rpcServer.
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type httpConnHijacker struct {
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corsdomains []string
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rpcServer *Server
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}
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// ServeHTTP will hijack the connection, wraps the captured connection in a
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// HttpMessageStream which is then used as codec.
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func (h *httpConnHijacker) ServeHTTP(w http.ResponseWriter, req *http.Request) {
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hj, ok := w.(http.Hijacker)
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if !ok {
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http.Error(w, "webserver doesn't support hijacking", http.StatusInternalServerError)
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return
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}
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conn, rwbuf, err := hj.Hijack()
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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httpRequestStream := NewHTTPMessageStream(conn, rwbuf, req, h.corsdomains)
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codec := NewJSONCodec(httpRequestStream)
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go h.rpcServer.ServeCodec(codec)
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}
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// NewHTTPServer creates a new HTTP RPC server around an API provider.
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func NewHTTPServer(cors string, handler *Server) *http.Server {
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return &http.Server{
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Handler: &httpConnHijacker{
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corsdomains: strings.Split(cors, ","),
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rpcServer: handler,
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},
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}
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}
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// httpClient connects to a geth RPC server over HTTP.
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type httpClient struct {
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endpoint *url.URL // HTTP-RPC server endpoint
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lastRes []byte // HTTP requests are synchronous, store last response
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}
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// NewHTTPClient create a new RPC clients that connection to a geth RPC server
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// over HTTP.
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func NewHTTPClient(endpoint string) (Client, error) {
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url, err := url.Parse(endpoint)
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if err != nil {
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return nil, err
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}
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return &httpClient{endpoint: url}, nil
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}
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// Send will serialize the given msg to JSON and sends it to the RPC server.
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// Since HTTP is synchronous the response is stored until Recv is called.
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func (client *httpClient) Send(msg interface{}) error {
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var body []byte
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var err error
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client.lastRes = nil
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if body, err = json.Marshal(msg); err != nil {
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return err
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}
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httpReq, err := http.NewRequest("POST", client.endpoint.String(), bytes.NewBuffer(body))
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if err != nil {
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return err
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}
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httpReq.Header.Set("Content-Type", "application/json")
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httpClient := http.Client{}
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resp, err := httpClient.Do(httpReq)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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if resp.StatusCode == http.StatusOK {
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client.lastRes, err = ioutil.ReadAll(resp.Body)
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return err
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}
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return fmt.Errorf("unable to handle request")
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}
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// Recv will try to deserialize the last received response into the given msg.
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func (client *httpClient) Recv(msg interface{}) error {
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return json.Unmarshal(client.lastRes, &msg)
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}
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// Close is not necessary for httpClient
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func (client *httpClient) Close() {
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}
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// SupportedModules will return the collection of offered RPC modules.
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func (client *httpClient) SupportedModules() (map[string]string, error) {
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return SupportedModules(client)
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}
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