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314 lines
8.8 KiB
314 lines
8.8 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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// WriteRPCResponseHTTPError marshals res as JSON (with indent) and writes it
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// to w.
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//
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// Maps JSON RPC error codes to HTTP Status codes as follows:
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//
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// HTTP Status code message
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// 500 -32700 Parse error.
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// 400 -32600 Invalid Request.
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// 404 -32601 Method not found.
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// 500 -32602 Invalid params.
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// 500 -32603 Internal error.
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// 500 -32099..-32000 Server error.
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//
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// source: https://www.jsonrpc.org/historical/json-rpc-over-http.html
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func WriteRPCResponseHTTPError(
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w http.ResponseWriter,
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res rpctypes.RPCResponse,
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) error {
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if res.Error == nil {
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panic("tried to write http error response without RPC error")
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}
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jsonBytes, err := json.MarshalIndent(res, "", " ")
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if err != nil {
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return fmt.Errorf("json marshal: %w", err)
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}
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var httpCode int
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switch res.Error.Code {
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case -32600:
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httpCode = http.StatusBadRequest
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case -32601:
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httpCode = http.StatusNotFound
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default:
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httpCode = http.StatusInternalServerError
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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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_, err = w.Write(jsonBytes)
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return err
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}
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// WriteRPCResponseHTTP marshals res as JSON (with indent) and writes it to w.
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// If the rpc response can be cached, add cache-control to the response header.
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func WriteRPCResponseHTTP(w http.ResponseWriter, res ...rpctypes.RPCResponse) error {
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var v interface{}
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if len(res) == 1 {
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v = res[0]
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} else {
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v = res
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}
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jsonBytes, err := json.MarshalIndent(v, "", " ")
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if err != nil {
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return fmt.Errorf("json marshal: %w", err)
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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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_, err = w.Write(jsonBytes)
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return err
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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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if wErr := WriteRPCResponseHTTP(rww, res); wErr != nil {
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logger.Error("failed to write response", "res", res, "err", wErr)
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}
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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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res := rpctypes.RPCInternalError(rpctypes.JSONRPCIntID(-1), err)
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if wErr := WriteRPCResponseHTTPError(rww, res); wErr != nil {
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logger.Error("failed to write response", "res", res, "err", wErr)
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}
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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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