You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
121 lines
3.4 KiB
121 lines
3.4 KiB
// Commons for HTTP handling
|
|
package rpcserver
|
|
|
|
import (
|
|
"bufio"
|
|
"bytes"
|
|
"fmt"
|
|
"net"
|
|
"net/http"
|
|
"runtime/debug"
|
|
"time"
|
|
|
|
"github.com/tendermint/tendermint/alert"
|
|
. "github.com/tendermint/tendermint/common"
|
|
. "github.com/tendermint/tendermint/rpc/types"
|
|
"github.com/tendermint/tendermint/wire"
|
|
)
|
|
|
|
func StartHTTPServer(listenAddr string, handler http.Handler) (net.Listener, error) {
|
|
log.Notice(Fmt("Starting RPC HTTP server on %v", listenAddr))
|
|
listener, err := net.Listen("tcp", listenAddr)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("Failed to listen to %v", listenAddr)
|
|
}
|
|
go func() {
|
|
res := http.Serve(
|
|
listener,
|
|
RecoverAndLogHandler(handler),
|
|
)
|
|
log.Crit("RPC HTTP server stopped", "result", res)
|
|
}()
|
|
return listener, nil
|
|
}
|
|
|
|
func WriteRPCResponse(w http.ResponseWriter, res RPCResponse) {
|
|
buf, n, err := new(bytes.Buffer), int64(0), error(nil)
|
|
wire.WriteJSON(res, buf, &n, &err)
|
|
if err != nil {
|
|
log.Error("Failed to write RPC response", "error", err, "res", res)
|
|
}
|
|
|
|
w.Header().Set("Content-Type", "application/json")
|
|
w.WriteHeader(200)
|
|
w.Write(buf.Bytes())
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
// Wraps an HTTP handler, adding error logging.
|
|
// If the inner function panics, the outer function recovers, logs, sends an
|
|
// HTTP 500 error response.
|
|
func RecoverAndLogHandler(handler http.Handler) http.Handler {
|
|
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|
// Wrap the ResponseWriter to remember the status
|
|
rww := &ResponseWriterWrapper{-1, w}
|
|
begin := time.Now()
|
|
|
|
// Common headers
|
|
origin := r.Header.Get("Origin")
|
|
rww.Header().Set("Access-Control-Allow-Origin", origin)
|
|
rww.Header().Set("Access-Control-Allow-Credentials", "true")
|
|
rww.Header().Set("Access-Control-Expose-Headers", "X-Server-Time")
|
|
rww.Header().Set("X-Server-Time", fmt.Sprintf("%v", begin.Unix()))
|
|
|
|
defer func() {
|
|
// Send a 500 error if a panic happens during a handler.
|
|
// Without this, Chrome & Firefox were retrying aborted ajax requests,
|
|
// at least to my localhost.
|
|
if e := recover(); e != nil {
|
|
|
|
// If RPCResponse
|
|
if res, ok := e.(RPCResponse); ok {
|
|
WriteRPCResponse(rww, res)
|
|
} else {
|
|
// For the rest,
|
|
log.Error("Panic in RPC HTTP handler", "error", e, "stack", string(debug.Stack()))
|
|
rww.WriteHeader(http.StatusInternalServerError)
|
|
WriteRPCResponse(rww, NewRPCResponse("", nil, Fmt("Internal Server Error: %v", e)))
|
|
}
|
|
}
|
|
|
|
// Finally, log.
|
|
durationMS := time.Since(begin).Nanoseconds() / 1000000
|
|
if rww.Status == -1 {
|
|
rww.Status = 200
|
|
}
|
|
log.Info("Served RPC HTTP response",
|
|
"method", r.Method, "url", r.URL,
|
|
"status", rww.Status, "duration", durationMS,
|
|
"remoteAddr", r.RemoteAddr,
|
|
)
|
|
}()
|
|
|
|
handler.ServeHTTP(rww, r)
|
|
})
|
|
}
|
|
|
|
// Remember the status for logging
|
|
type ResponseWriterWrapper struct {
|
|
Status int
|
|
http.ResponseWriter
|
|
}
|
|
|
|
func (w *ResponseWriterWrapper) WriteHeader(status int) {
|
|
w.Status = status
|
|
w.ResponseWriter.WriteHeader(status)
|
|
}
|
|
|
|
// implements http.Hijacker
|
|
func (w *ResponseWriterWrapper) Hijack() (net.Conn, *bufio.ReadWriter, error) {
|
|
return w.ResponseWriter.(http.Hijacker).Hijack()
|
|
}
|
|
|
|
// Stick it as a deferred statement in gouroutines to prevent the program from crashing.
|
|
func Recover(daemonName string) {
|
|
if e := recover(); e != nil {
|
|
stack := string(debug.Stack())
|
|
errorString := fmt.Sprintf("[%s] %s\n%s", daemonName, e, stack)
|
|
alert.Alert(errorString)
|
|
}
|
|
}
|