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121 lines
3.4 KiB
121 lines
3.4 KiB
// Commons for HTTP handling
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package rpcserver
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import (
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"bufio"
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"bytes"
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"fmt"
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"net"
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"net/http"
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"runtime/debug"
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"time"
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. "github.com/tendermint/go-common"
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"github.com/tendermint/go-wire"
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"github.com/tendermint/tendermint/alert"
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. "github.com/tendermint/tendermint/rpc/types"
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)
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func StartHTTPServer(listenAddr string, handler http.Handler) (net.Listener, error) {
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log.Notice(Fmt("Starting RPC HTTP server on %v", listenAddr))
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listener, err := net.Listen("tcp", listenAddr)
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if err != nil {
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return nil, fmt.Errorf("Failed to listen to %v", listenAddr)
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}
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go func() {
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res := http.Serve(
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listener,
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RecoverAndLogHandler(handler),
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)
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log.Crit("RPC HTTP server stopped", "result", res)
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}()
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return listener, nil
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}
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func WriteRPCResponse(w http.ResponseWriter, res RPCResponse) {
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buf, n, err := new(bytes.Buffer), int(0), error(nil)
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wire.WriteJSON(res, buf, &n, &err)
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if err != nil {
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log.Error("Failed to write RPC response", "error", err, "res", res)
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}
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(200)
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w.Write(buf.Bytes())
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}
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//-----------------------------------------------------------------------------
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// Wraps an HTTP handler, adding error logging.
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// If the inner function panics, the outer function recovers, logs, sends an
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// HTTP 500 error response.
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func RecoverAndLogHandler(handler http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// Wrap the ResponseWriter to remember the status
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rww := &ResponseWriterWrapper{-1, w}
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begin := time.Now()
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// Common headers
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origin := r.Header.Get("Origin")
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rww.Header().Set("Access-Control-Allow-Origin", origin)
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rww.Header().Set("Access-Control-Allow-Credentials", "true")
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rww.Header().Set("Access-Control-Expose-Headers", "X-Server-Time")
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rww.Header().Set("X-Server-Time", fmt.Sprintf("%v", begin.Unix()))
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defer func() {
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// Send a 500 error if a panic happens during a handler.
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// Without this, Chrome & Firefox were retrying aborted ajax requests,
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// at least to my localhost.
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if e := recover(); e != nil {
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// If RPCResponse
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if res, ok := e.(RPCResponse); ok {
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WriteRPCResponse(rww, res)
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} else {
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// For the rest,
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log.Error("Panic in RPC HTTP handler", "error", e, "stack", string(debug.Stack()))
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rww.WriteHeader(http.StatusInternalServerError)
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WriteRPCResponse(rww, NewRPCResponse("", nil, Fmt("Internal Server Error: %v", e)))
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}
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}
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// Finally, log.
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durationMS := time.Since(begin).Nanoseconds() / 1000000
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if rww.Status == -1 {
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rww.Status = 200
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}
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log.Info("Served RPC HTTP response",
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"method", r.Method, "url", r.URL,
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"status", rww.Status, "duration", durationMS,
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"remoteAddr", r.RemoteAddr,
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)
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}()
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handler.ServeHTTP(rww, r)
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})
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}
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// Remember the status for logging
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type ResponseWriterWrapper struct {
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Status int
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http.ResponseWriter
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}
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func (w *ResponseWriterWrapper) WriteHeader(status int) {
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w.Status = status
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w.ResponseWriter.WriteHeader(status)
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}
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// implements http.Hijacker
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func (w *ResponseWriterWrapper) Hijack() (net.Conn, *bufio.ReadWriter, error) {
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return w.ResponseWriter.(http.Hijacker).Hijack()
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}
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// Stick it as a deferred statement in gouroutines to prevent the program from crashing.
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func Recover(daemonName string) {
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if e := recover(); e != nil {
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stack := string(debug.Stack())
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errorString := fmt.Sprintf("[%s] %s\n%s", daemonName, e, stack)
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alert.Alert(errorString)
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}
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}
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