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299 lines
8.6 KiB
299 lines
8.6 KiB
// Commons for HTTP handling
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package server
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import (
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"bufio"
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"net"
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"net/http"
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"os"
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"runtime/debug"
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"strings"
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"time"
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"golang.org/x/net/netutil"
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"github.com/tendermint/tendermint/libs/log"
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rpctypes "github.com/tendermint/tendermint/rpc/jsonrpc/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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// 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
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// mirrors http.Server#MaxHeaderBytes
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MaxHeaderBytes int
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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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MaxBodyBytes: int64(1000000), // 1MB
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MaxHeaderBytes: 1 << 20, // same as the net/http default
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}
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}
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// Serve creates a http.Server and calls Serve with the given listener. It
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// wraps handler with RecoverAndLogHandler and a handler, which limits the max
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// body size to config.MaxBodyBytes.
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//
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// NOTE: This function blocks - you may want to call it in a go-routine.
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func Serve(
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ctx context.Context,
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listener net.Listener,
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handler http.Handler,
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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 HTTP server on %s", listener.Addr()))
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s := &http.Server{
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Handler: RecoverAndLogHandler(maxBytesHandler{h: handler, n: config.MaxBodyBytes}, logger),
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ReadTimeout: config.ReadTimeout,
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WriteTimeout: config.WriteTimeout,
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MaxHeaderBytes: config.MaxHeaderBytes,
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}
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sig := make(chan struct{})
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go func() {
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select {
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case <-ctx.Done():
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sctx, cancel := context.WithTimeout(context.Background(), time.Second)
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defer cancel()
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_ = s.Shutdown(sctx)
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case <-sig:
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}
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}()
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if err := s.Serve(listener); err != nil {
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logger.Info("RPC HTTP server stopped", "err", err)
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close(sig)
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return err
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}
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return nil
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}
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// Serve creates a http.Server and calls ServeTLS with the given listener,
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// certFile and keyFile. It wraps handler with RecoverAndLogHandler and a
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// handler, which limits the max body size to config.MaxBodyBytes.
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//
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// NOTE: This function blocks - you may want to call it in a go-routine.
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func ServeTLS(
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ctx context.Context,
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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: config.MaxBodyBytes}, logger),
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ReadTimeout: config.ReadTimeout,
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WriteTimeout: config.WriteTimeout,
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MaxHeaderBytes: config.MaxHeaderBytes,
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}
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sig := make(chan struct{})
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go func() {
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select {
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case <-ctx.Done():
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sctx, cancel := context.WithTimeout(context.Background(), time.Second)
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defer cancel()
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_ = s.Shutdown(sctx)
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case <-sig:
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}
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}()
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if err := s.ServeTLS(listener, certFile, keyFile); err != nil {
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logger.Error("RPC HTTPS server stopped", "err", err)
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close(sig)
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return err
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}
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return nil
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}
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// writeInternalError writes an internal server error (500) to w with the text
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// of err in the body. This is a fallback used when a handler is unable to
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// write the expected response.
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func writeInternalError(w http.ResponseWriter, err error) {
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w.Header().Set("Content-Type", "text/plain")
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w.WriteHeader(http.StatusInternalServerError)
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fmt.Fprintln(w, err.Error())
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}
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// writeHTTPResponse writes a JSON-RPC response to w. If rsp encodes an error,
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// the response body is its error object; otherwise its responses is the result.
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//
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// Unless there is an error encoding the response, the status is 200 OK.
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func writeHTTPResponse(w http.ResponseWriter, log log.Logger, rsp rpctypes.RPCResponse) {
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var body []byte
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var err error
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if rsp.Error != nil {
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body, err = json.Marshal(rsp.Error)
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} else {
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body = rsp.Result
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}
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if err != nil {
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log.Error("Error encoding RPC response: %w", err)
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writeInternalError(w, err)
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return
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}
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusOK)
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_, _ = w.Write(body)
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}
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// writeRPCResponse writes one or more JSON-RPC responses to w. A single
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// response is encoded as an object, otherwise the response is sent as a batch
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// (array) of response objects.
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//
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// Unless there is an error encoding the responses, the status is 200 OK.
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func writeRPCResponse(w http.ResponseWriter, log log.Logger, rsps ...rpctypes.RPCResponse) {
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var body []byte
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var err error
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if len(rsps) == 1 {
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body, err = json.Marshal(rsps[0])
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} else {
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body, err = json.Marshal(rsps)
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}
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if err != nil {
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log.Error("Error encoding RPC response: %w", err)
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writeInternalError(w, err)
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return
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}
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusOK)
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_, _ = w.Write(body)
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}
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//-----------------------------------------------------------------------------
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// RecoverAndLogHandler 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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// Handle any panics in the panic handler below. Does not use the logger, since we want
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// to avoid any further panics. However, we try to return a 500, since it otherwise
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// defaults to 200 and there is no other way to terminate the connection. If that
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// should panic for whatever reason then the Go HTTP server will handle it and
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// terminate the connection - panicing is the de-facto and only way to get the Go HTTP
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// server to terminate the request and close the connection/stream:
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// https://github.com/golang/go/issues/17790#issuecomment-258481416
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if e := recover(); e != nil {
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fmt.Fprintf(os.Stderr, "Panic during RPC panic recovery: %v\n%v\n", e, string(debug.Stack()))
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w.WriteHeader(500)
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}
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}()
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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.(rpctypes.RPCResponse); ok {
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writeRPCResponse(rww, logger, res)
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} else {
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// Panics can contain anything, attempt to normalize it as an error.
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var err error
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switch e := e.(type) {
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case error:
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err = e
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case string:
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err = errors.New(e)
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case fmt.Stringer:
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err = errors.New(e.String())
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default:
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}
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logger.Error("Panic in RPC HTTP handler", "err", e, "stack", string(debug.Stack()))
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writeInternalError(rww, err)
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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.Debug("served RPC HTTP response",
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"method", r.Method,
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"url", r.URL,
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"status", rww.Status,
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"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, maxOpenConnections int) (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, fmt.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, fmt.Errorf("failed to listen on %v: %v", addr, err)
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}
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if maxOpenConnections > 0 {
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listener = netutil.LimitListener(listener, maxOpenConnections)
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}
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return listener, nil
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}
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