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http_server.go
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http_server.go
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// Commons for HTTP handling
package rpcserver
import (
"bufio"
"encoding/json"
"fmt"
"net"
"net/http"
"runtime/debug"
"strings"
"time"
"github.com/pkg/errors"
"golang.org/x/net/netutil"
"github.com/tendermint/tendermint/libs/log"
types "github.com/tendermint/tendermint/rpc/lib/types"
)
// Config is a RPC server configuration.
type Config struct {
// see netutil.LimitListener
MaxOpenConnections int
// mirrors http.Server#ReadTimeout
ReadTimeout time.Duration
// mirrors http.Server#WriteTimeout
WriteTimeout time.Duration
}
// DefaultConfig returns a default configuration.
func DefaultConfig() *Config {
return &Config{
MaxOpenConnections: 0, // unlimited
ReadTimeout: 10 * time.Second,
WriteTimeout: 10 * time.Second,
}
}
const (
// maxBodyBytes controls the maximum number of bytes the
// server will read parsing the request body.
maxBodyBytes = int64(1000000) // 1MB
// same as the net/http default
maxHeaderBytes = 1 << 20
)
// StartHTTPServer takes a listener and starts an HTTP server with the given handler.
// It wraps handler with RecoverAndLogHandler.
// NOTE: This function blocks - you may want to call it in a go-routine.
func StartHTTPServer(listener net.Listener, handler http.Handler, logger log.Logger, config *Config) error {
logger.Info(fmt.Sprintf("Starting RPC HTTP server on %s", listener.Addr()))
s := &http.Server{
Handler: RecoverAndLogHandler(maxBytesHandler{h: handler, n: maxBodyBytes}, logger),
ReadTimeout: config.ReadTimeout,
WriteTimeout: config.WriteTimeout,
MaxHeaderBytes: maxHeaderBytes,
}
err := s.Serve(listener)
logger.Info("RPC HTTP server stopped", "err", err)
return err
}
// StartHTTPAndTLSServer takes a listener and starts an HTTPS server with the given handler.
// It wraps handler with RecoverAndLogHandler.
// NOTE: This function blocks - you may want to call it in a go-routine.
func StartHTTPAndTLSServer(
listener net.Listener,
handler http.Handler,
certFile, keyFile string,
logger log.Logger,
config *Config,
) error {
logger.Info(fmt.Sprintf("Starting RPC HTTPS server on %s (cert: %q, key: %q)",
listener.Addr(), certFile, keyFile))
s := &http.Server{
Handler: RecoverAndLogHandler(maxBytesHandler{h: handler, n: maxBodyBytes}, logger),
ReadTimeout: config.ReadTimeout,
WriteTimeout: config.WriteTimeout,
MaxHeaderBytes: maxHeaderBytes,
}
err := s.ServeTLS(listener, certFile, keyFile)
logger.Error("RPC HTTPS server stopped", "err", err)
return err
}
func WriteRPCResponseHTTPError(
w http.ResponseWriter,
httpCode int,
res types.RPCResponse,
) {
jsonBytes, err := json.MarshalIndent(res, "", " ")
if err != nil {
panic(err)
}
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(httpCode)
w.Write(jsonBytes) // nolint: errcheck, gas
}
func WriteRPCResponseHTTP(w http.ResponseWriter, res types.RPCResponse) {
jsonBytes, err := json.MarshalIndent(res, "", " ")
if err != nil {
panic(err)
}
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(200)
w.Write(jsonBytes) // nolint: errcheck, gas
}
//-----------------------------------------------------------------------------
// 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, logger log.Logger) 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()
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.(types.RPCResponse); ok {
WriteRPCResponseHTTP(rww, res)
} else {
// For the rest,
logger.Error(
"Panic in RPC HTTP handler", "err", e, "stack",
string(debug.Stack()),
)
WriteRPCResponseHTTPError(rww, http.StatusInternalServerError, types.RPCInternalError(types.JSONRPCStringID(""), e.(error)))
}
}
// Finally, log.
durationMS := time.Since(begin).Nanoseconds() / 1000000
if rww.Status == -1 {
rww.Status = 200
}
logger.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()
}
type maxBytesHandler struct {
h http.Handler
n int64
}
func (h maxBytesHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
r.Body = http.MaxBytesReader(w, r.Body, h.n)
h.h.ServeHTTP(w, r)
}
// Listen starts a new net.Listener on the given address.
// It returns an error if the address is invalid or the call to Listen() fails.
func Listen(addr string, config *Config) (listener net.Listener, err error) {
parts := strings.SplitN(addr, "://", 2)
if len(parts) != 2 {
return nil, errors.Errorf(
"Invalid listening address %s (use fully formed addresses, including the tcp:// or unix:// prefix)",
addr,
)
}
proto, addr := parts[0], parts[1]
listener, err = net.Listen(proto, addr)
if err != nil {
return nil, errors.Errorf("Failed to listen on %v: %v", addr, err)
}
if config.MaxOpenConnections > 0 {
listener = netutil.LimitListener(listener, config.MaxOpenConnections)
}
return listener, nil
}