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208 lines
5.8 KiB
208 lines
5.8 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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"encoding/json"
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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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"strings"
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"time"
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"github.com/pkg/errors"
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"golang.org/x/net/netutil"
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"github.com/tendermint/tendermint/libs/log"
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types "github.com/tendermint/tendermint/rpc/lib/types"
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)
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// Config is a RPC server configuration.
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type Config struct {
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// see netutil.LimitListener
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MaxOpenConnections int
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// mirrors http.Server#ReadTimeout
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ReadTimeout time.Duration
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// mirrors http.Server#WriteTimeout
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WriteTimeout time.Duration
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}
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// DefaultConfig returns a default configuration.
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func DefaultConfig() *Config {
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return &Config{
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MaxOpenConnections: 0, // unlimited
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ReadTimeout: 10 * time.Second,
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WriteTimeout: 10 * time.Second,
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}
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}
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const (
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// maxBodyBytes controls the maximum number of bytes the
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// server will read parsing the request body.
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maxBodyBytes = int64(1000000) // 1MB
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// same as the net/http default
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maxHeaderBytes = 1 << 20
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)
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// StartHTTPServer takes a listener and starts an HTTP server with the given handler.
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// It wraps handler with RecoverAndLogHandler.
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// NOTE: This function blocks - you may want to call it in a go-routine.
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func StartHTTPServer(listener net.Listener, handler http.Handler, logger log.Logger, config *Config) error {
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logger.Info(fmt.Sprintf("Starting RPC HTTP server on %s", listener.Addr()))
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s := &http.Server{
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Handler: RecoverAndLogHandler(maxBytesHandler{h: handler, n: maxBodyBytes}, logger),
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ReadTimeout: config.ReadTimeout,
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WriteTimeout: config.WriteTimeout,
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MaxHeaderBytes: maxHeaderBytes,
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}
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err := s.Serve(listener)
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logger.Info("RPC HTTP server stopped", "err", err)
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return err
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}
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// StartHTTPAndTLSServer takes a listener and starts an HTTPS server with the given handler.
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// It wraps handler with RecoverAndLogHandler.
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// NOTE: This function blocks - you may want to call it in a go-routine.
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func StartHTTPAndTLSServer(
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listener net.Listener,
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handler http.Handler,
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certFile, keyFile string,
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logger log.Logger,
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config *Config,
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) error {
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logger.Info(fmt.Sprintf("Starting RPC HTTPS server on %s (cert: %q, key: %q)",
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listener.Addr(), certFile, keyFile))
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s := &http.Server{
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Handler: RecoverAndLogHandler(maxBytesHandler{h: handler, n: maxBodyBytes}, logger),
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ReadTimeout: config.ReadTimeout,
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WriteTimeout: config.WriteTimeout,
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MaxHeaderBytes: maxHeaderBytes,
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}
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err := s.ServeTLS(listener, certFile, keyFile)
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logger.Error("RPC HTTPS server stopped", "err", err)
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return err
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}
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func WriteRPCResponseHTTPError(
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w http.ResponseWriter,
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httpCode int,
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res types.RPCResponse,
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) {
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jsonBytes, err := json.MarshalIndent(res, "", " ")
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if err != nil {
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panic(err)
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}
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(httpCode)
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w.Write(jsonBytes) // nolint: errcheck, gas
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}
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func WriteRPCResponseHTTP(w http.ResponseWriter, res types.RPCResponse) {
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jsonBytes, err := json.MarshalIndent(res, "", " ")
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if err != nil {
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panic(err)
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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(jsonBytes) // nolint: errcheck, gas
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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, logger log.Logger) 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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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.(types.RPCResponse); ok {
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WriteRPCResponseHTTP(rww, res)
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} else {
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// For the rest,
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logger.Error(
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"Panic in RPC HTTP handler", "err", e, "stack",
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string(debug.Stack()),
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)
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WriteRPCResponseHTTPError(rww, http.StatusInternalServerError, types.RPCInternalError(types.JSONRPCStringID(""), e.(error)))
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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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logger.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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type maxBytesHandler struct {
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h http.Handler
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n int64
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}
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func (h maxBytesHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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r.Body = http.MaxBytesReader(w, r.Body, h.n)
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h.h.ServeHTTP(w, r)
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}
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// Listen starts a new net.Listener on the given address.
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// It returns an error if the address is invalid or the call to Listen() fails.
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func Listen(addr string, config *Config) (listener net.Listener, err error) {
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parts := strings.SplitN(addr, "://", 2)
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if len(parts) != 2 {
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return nil, errors.Errorf(
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"Invalid listening address %s (use fully formed addresses, including the tcp:// or unix:// prefix)",
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addr,
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)
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}
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proto, addr := parts[0], parts[1]
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listener, err = net.Listen(proto, addr)
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if err != nil {
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return nil, errors.Errorf("Failed to listen on %v: %v", addr, err)
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}
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if config.MaxOpenConnections > 0 {
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listener = netutil.LimitListener(listener, config.MaxOpenConnections)
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}
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return listener, nil
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}
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