mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
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f409cdad76
It never worked, whisper uses polling. Co-authored-by: Felix Lange <fjl@twurst.com>
646 lines
19 KiB
Go
646 lines
19 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package rpc
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import (
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"bytes"
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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/url"
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"reflect"
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"strconv"
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"sync/atomic"
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"time"
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"github.com/ledgerwatch/turbo-geth/log"
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)
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var (
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ErrClientQuit = errors.New("client is closed")
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ErrNoResult = errors.New("no result in JSON-RPC response")
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ErrSubscriptionQueueOverflow = errors.New("subscription queue overflow")
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errClientReconnected = errors.New("client reconnected")
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errDead = errors.New("connection lost")
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)
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const (
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// Timeouts
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defaultDialTimeout = 10 * time.Second // used if context has no deadline
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subscribeTimeout = 5 * time.Second // overall timeout eth_subscribe, rpc_modules calls
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)
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const (
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// Subscriptions are removed when the subscriber cannot keep up.
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//
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// This can be worked around by supplying a channel with sufficiently sized buffer,
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// but this can be inconvenient and hard to explain in the docs. Another issue with
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// buffered channels is that the buffer is static even though it might not be needed
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// most of the time.
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//
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// The approach taken here is to maintain a per-subscription linked list buffer
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// shrinks on demand. If the buffer reaches the size below, the subscription is
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// dropped.
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maxClientSubscriptionBuffer = 20000
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)
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// BatchElem is an element in a batch request.
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type BatchElem struct {
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Method string
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Args []interface{}
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// The result is unmarshaled into this field. Result must be set to a
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// non-nil pointer value of the desired type, otherwise the response will be
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// discarded.
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Result interface{}
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// Error is set if the server returns an error for this request, or if
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// unmarshaling into Result fails. It is not set for I/O errors.
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Error error
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}
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// Client represents a connection to an RPC server.
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type Client struct {
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idgen func() ID // for subscriptions
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isHTTP bool
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services *serviceRegistry
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methodAllowList AllowList
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idCounter uint32
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// This function, if non-nil, is called when the connection is lost.
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reconnectFunc reconnectFunc
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// writeConn is used for writing to the connection on the caller's goroutine. It should
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// only be accessed outside of dispatch, with the write lock held. The write lock is
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// taken by sending on reqInit and released by sending on reqSent.
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writeConn jsonWriter
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// for dispatch
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close chan struct{}
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closing chan struct{} // closed when client is quitting
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didClose chan struct{} // closed when client quits
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reconnected chan ServerCodec // where write/reconnect sends the new connection
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readOp chan readOp // read messages
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readErr chan error // errors from read
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reqInit chan *requestOp // register response IDs, takes write lock
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reqSent chan error // signals write completion, releases write lock
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reqTimeout chan *requestOp // removes response IDs when call timeout expires
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}
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type reconnectFunc func(ctx context.Context) (ServerCodec, error)
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type clientContextKey struct{}
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type clientConn struct {
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codec ServerCodec
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handler *handler
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}
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func (c *Client) newClientConn(conn ServerCodec) *clientConn {
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ctx := context.WithValue(context.Background(), clientContextKey{}, c)
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handler := newHandler(ctx, conn, c.idgen, c.services, c.methodAllowList)
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return &clientConn{conn, handler}
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}
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func (cc *clientConn) close(err error, inflightReq *requestOp) {
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cc.handler.close(err, inflightReq)
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cc.codec.close()
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}
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type readOp struct {
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msgs []*jsonrpcMessage
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batch bool
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}
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type requestOp struct {
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ids []json.RawMessage
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err error
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resp chan *jsonrpcMessage // receives up to len(ids) responses
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sub *ClientSubscription // only set for EthSubscribe requests
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}
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func (op *requestOp) wait(ctx context.Context, c *Client) (*jsonrpcMessage, error) {
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select {
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case <-ctx.Done():
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// Send the timeout to dispatch so it can remove the request IDs.
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if !c.isHTTP {
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select {
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case c.reqTimeout <- op:
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case <-c.closing:
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}
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}
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return nil, ctx.Err()
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case resp := <-op.resp:
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return resp, op.err
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}
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}
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// Dial creates a new client for the given URL.
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//
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// The currently supported URL schemes are "http", "https", "ws" and "wss". If rawurl is a
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// file name with no URL scheme, a local socket connection is established using UNIX
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// domain sockets on supported platforms and named pipes on Windows. If you want to
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// configure transport options, use DialHTTP, DialWebsocket or DialIPC instead.
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//
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// For websocket connections, the origin is set to the local host name.
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//
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// The client reconnects automatically if the connection is lost.
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func Dial(rawurl string) (*Client, error) {
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return DialContext(context.Background(), rawurl)
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}
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// DialContext creates a new RPC client, just like Dial.
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//
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// The context is used to cancel or time out the initial connection establishment. It does
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// not affect subsequent interactions with the client.
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func DialContext(ctx context.Context, rawurl string) (*Client, error) {
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u, err := url.Parse(rawurl)
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if err != nil {
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return nil, err
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}
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switch u.Scheme {
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case "http", "https":
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return DialHTTP(rawurl)
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case "ws", "wss":
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return DialWebsocket(ctx, rawurl, "")
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case "stdio":
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return DialStdIO(ctx)
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case "":
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return DialIPC(ctx, rawurl)
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default:
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return nil, fmt.Errorf("no known transport for URL scheme %q", u.Scheme)
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}
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}
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// Client retrieves the client from the context, if any. This can be used to perform
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// 'reverse calls' in a handler method.
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func ClientFromContext(ctx context.Context) (*Client, bool) {
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client, ok := ctx.Value(clientContextKey{}).(*Client)
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return client, ok
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}
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func newClient(initctx context.Context, connect reconnectFunc) (*Client, error) {
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conn, err := connect(initctx)
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if err != nil {
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return nil, err
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}
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c := initClient(conn, randomIDGenerator(), new(serviceRegistry))
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c.reconnectFunc = connect
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return c, nil
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}
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func initClient(conn ServerCodec, idgen func() ID, services *serviceRegistry) *Client {
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_, isHTTP := conn.(*httpConn)
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c := &Client{
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idgen: idgen,
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isHTTP: isHTTP,
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services: services,
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writeConn: conn,
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close: make(chan struct{}),
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closing: make(chan struct{}),
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didClose: make(chan struct{}),
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reconnected: make(chan ServerCodec),
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readOp: make(chan readOp),
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readErr: make(chan error),
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reqInit: make(chan *requestOp),
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reqSent: make(chan error, 1),
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reqTimeout: make(chan *requestOp),
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}
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if !isHTTP {
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go c.dispatch(conn)
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}
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return c
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}
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// RegisterName creates a service for the given receiver type under the given name. When no
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// methods on the given receiver match the criteria to be either a RPC method or a
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// subscription an error is returned. Otherwise a new service is created and added to the
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// service collection this client provides to the server.
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func (c *Client) RegisterName(name string, receiver interface{}) error {
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return c.services.registerName(name, receiver)
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}
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func (c *Client) nextID() json.RawMessage {
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id := atomic.AddUint32(&c.idCounter, 1)
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return strconv.AppendUint(nil, uint64(id), 10)
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}
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// SupportedModules calls the rpc_modules method, retrieving the list of
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// APIs that are available on the server.
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func (c *Client) SupportedModules() (map[string]string, error) {
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var result map[string]string
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ctx, cancel := context.WithTimeout(context.Background(), subscribeTimeout)
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defer cancel()
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err := c.CallContext(ctx, &result, "rpc_modules")
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return result, err
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}
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// Close closes the client, aborting any in-flight requests.
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func (c *Client) Close() {
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if c.isHTTP {
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return
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}
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select {
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case c.close <- struct{}{}:
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<-c.didClose
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case <-c.didClose:
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}
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}
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// SetHeader adds a custom HTTP header to the client's requests.
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// This method only works for clients using HTTP, it doesn't have
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// any effect for clients using another transport.
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func (c *Client) SetHeader(key, value string) {
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if !c.isHTTP {
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return
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}
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conn := c.writeConn.(*httpConn)
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conn.mu.Lock()
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conn.headers.Set(key, value)
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conn.mu.Unlock()
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}
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// Call performs a JSON-RPC call with the given arguments and unmarshals into
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// result if no error occurred.
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//
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// The result must be a pointer so that package json can unmarshal into it. You
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// can also pass nil, in which case the result is ignored.
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func (c *Client) Call(result interface{}, method string, args ...interface{}) error {
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ctx := context.Background()
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return c.CallContext(ctx, result, method, args...)
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}
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// CallContext performs a JSON-RPC call with the given arguments. If the context is
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// canceled before the call has successfully returned, CallContext returns immediately.
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//
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// The result must be a pointer so that package json can unmarshal into it. You
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// can also pass nil, in which case the result is ignored.
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func (c *Client) CallContext(ctx context.Context, result interface{}, method string, args ...interface{}) error {
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if result != nil && reflect.TypeOf(result).Kind() != reflect.Ptr {
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return fmt.Errorf("call result parameter must be pointer or nil interface: %v", result)
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}
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msg, err := c.newMessage(method, args...)
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if err != nil {
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return err
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}
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op := &requestOp{ids: []json.RawMessage{msg.ID}, resp: make(chan *jsonrpcMessage, 1)}
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if c.isHTTP {
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err = c.sendHTTP(ctx, op, msg)
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} else {
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err = c.send(ctx, op, msg)
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}
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if err != nil {
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return err
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}
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// dispatch has accepted the request and will close the channel when it quits.
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switch resp, err := op.wait(ctx, c); {
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case err != nil:
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return err
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case resp.Error != nil:
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return resp.Error
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case len(resp.Result) == 0:
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return ErrNoResult
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default:
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return json.Unmarshal(resp.Result, &result)
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}
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}
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// BatchCall sends all given requests as a single batch and waits for the server
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// to return a response for all of them.
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//
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// In contrast to Call, BatchCall only returns I/O errors. Any error specific to
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// a request is reported through the Error field of the corresponding BatchElem.
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//
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// Note that batch calls may not be executed atomically on the server side.
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func (c *Client) BatchCall(b []BatchElem) error {
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ctx := context.Background()
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return c.BatchCallContext(ctx, b)
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}
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// BatchCall sends all given requests as a single batch and waits for the server
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// to return a response for all of them. The wait duration is bounded by the
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// context's deadline.
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//
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// In contrast to CallContext, BatchCallContext only returns errors that have occurred
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// while sending the request. Any error specific to a request is reported through the
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// Error field of the corresponding BatchElem.
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//
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// Note that batch calls may not be executed atomically on the server side.
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func (c *Client) BatchCallContext(ctx context.Context, b []BatchElem) error {
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msgs := make([]*jsonrpcMessage, len(b))
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op := &requestOp{
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ids: make([]json.RawMessage, len(b)),
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resp: make(chan *jsonrpcMessage, len(b)),
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}
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for i, elem := range b {
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msg, err := c.newMessage(elem.Method, elem.Args...)
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if err != nil {
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return err
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}
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msgs[i] = msg
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op.ids[i] = msg.ID
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}
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var err error
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if c.isHTTP {
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err = c.sendBatchHTTP(ctx, op, msgs)
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} else {
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err = c.send(ctx, op, msgs)
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}
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// Wait for all responses to come back.
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for n := 0; n < len(b) && err == nil; n++ {
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var resp *jsonrpcMessage
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resp, err = op.wait(ctx, c)
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if err != nil {
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break
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}
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// Find the element corresponding to this response.
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// The element is guaranteed to be present because dispatch
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// only sends valid IDs to our channel.
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var elem *BatchElem
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for i := range msgs {
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if bytes.Equal(msgs[i].ID, resp.ID) {
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elem = &b[i]
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break
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}
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}
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if resp.Error != nil {
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elem.Error = resp.Error
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continue
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}
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if len(resp.Result) == 0 {
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elem.Error = ErrNoResult
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continue
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}
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elem.Error = json.Unmarshal(resp.Result, elem.Result)
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}
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return err
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}
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// Notify sends a notification, i.e. a method call that doesn't expect a response.
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func (c *Client) Notify(ctx context.Context, method string, args ...interface{}) error {
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op := new(requestOp)
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msg, err := c.newMessage(method, args...)
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if err != nil {
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return err
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}
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msg.ID = nil
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if c.isHTTP {
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return c.sendHTTP(ctx, op, msg)
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}
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return c.send(ctx, op, msg)
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}
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// EthSubscribe registers a subscripion under the "eth" namespace.
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func (c *Client) EthSubscribe(ctx context.Context, channel interface{}, args ...interface{}) (*ClientSubscription, error) {
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return c.Subscribe(ctx, "eth", channel, args...)
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}
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// ShhSubscribe registers a subscripion under the "shh" namespace.
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// Deprecated: use Subscribe(ctx, "shh", ...).
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func (c *Client) ShhSubscribe(ctx context.Context, channel interface{}, args ...interface{}) (*ClientSubscription, error) {
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return c.Subscribe(ctx, "shh", channel, args...)
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}
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// Subscribe calls the "<namespace>_subscribe" method with the given arguments,
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// registering a subscription. Server notifications for the subscription are
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// sent to the given channel. The element type of the channel must match the
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// expected type of content returned by the subscription.
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//
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// The context argument cancels the RPC request that sets up the subscription but has no
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// effect on the subscription after Subscribe has returned.
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//
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// Slow subscribers will be dropped eventually. Client buffers up to 20000 notifications
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// before considering the subscriber dead. The subscription Err channel will receive
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// ErrSubscriptionQueueOverflow. Use a sufficiently large buffer on the channel or ensure
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// that the channel usually has at least one reader to prevent this issue.
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func (c *Client) Subscribe(ctx context.Context, namespace string, channel interface{}, args ...interface{}) (*ClientSubscription, error) {
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// Check type of channel first.
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chanVal := reflect.ValueOf(channel)
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if chanVal.Kind() != reflect.Chan || chanVal.Type().ChanDir()&reflect.SendDir == 0 {
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panic("first argument to Subscribe must be a writable channel")
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}
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if chanVal.IsNil() {
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panic("channel given to Subscribe must not be nil")
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}
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if c.isHTTP {
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return nil, ErrNotificationsUnsupported
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}
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msg, err := c.newMessage(namespace+subscribeMethodSuffix, args...)
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if err != nil {
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return nil, err
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}
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op := &requestOp{
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ids: []json.RawMessage{msg.ID},
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resp: make(chan *jsonrpcMessage),
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sub: newClientSubscription(c, namespace, chanVal),
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}
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// Send the subscription request.
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// The arrival and validity of the response is signaled on sub.quit.
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if err := c.send(ctx, op, msg); err != nil {
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return nil, err
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}
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if _, err := op.wait(ctx, c); err != nil {
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return nil, err
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}
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return op.sub, nil
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}
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func (c *Client) newMessage(method string, paramsIn ...interface{}) (*jsonrpcMessage, error) {
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msg := &jsonrpcMessage{Version: vsn, ID: c.nextID(), Method: method}
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if paramsIn != nil { // prevent sending "params":null
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var err error
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if msg.Params, err = json.Marshal(paramsIn); err != nil {
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return nil, err
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}
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}
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return msg, nil
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}
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// send registers op with the dispatch loop, then sends msg on the connection.
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// if sending fails, op is deregistered.
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func (c *Client) send(ctx context.Context, op *requestOp, msg interface{}) error {
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select {
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case c.reqInit <- op:
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err := c.write(ctx, msg, false)
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c.reqSent <- err
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return err
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case <-ctx.Done():
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// This can happen if the client is overloaded or unable to keep up with
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// subscription notifications.
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return ctx.Err()
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case <-c.closing:
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return ErrClientQuit
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}
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}
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func (c *Client) write(ctx context.Context, msg interface{}, retry bool) error {
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// The previous write failed. Try to establish a new connection.
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if c.writeConn == nil {
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if err := c.reconnect(ctx); err != nil {
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return err
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}
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}
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err := c.writeConn.writeJSON(ctx, msg)
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if err != nil {
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c.writeConn = nil
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if !retry {
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return c.write(ctx, msg, true)
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}
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}
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return err
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}
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func (c *Client) reconnect(ctx context.Context) error {
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if c.reconnectFunc == nil {
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return errDead
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|
}
|
|
|
|
if _, ok := ctx.Deadline(); !ok {
|
|
var cancel func()
|
|
ctx, cancel = context.WithTimeout(ctx, defaultDialTimeout)
|
|
defer cancel()
|
|
}
|
|
newconn, err := c.reconnectFunc(ctx)
|
|
if err != nil {
|
|
log.Trace("RPC client reconnect failed", "err", err)
|
|
return err
|
|
}
|
|
select {
|
|
case c.reconnected <- newconn:
|
|
c.writeConn = newconn
|
|
return nil
|
|
case <-c.didClose:
|
|
newconn.close()
|
|
return ErrClientQuit
|
|
}
|
|
}
|
|
|
|
// dispatch is the main loop of the client.
|
|
// It sends read messages to waiting calls to Call and BatchCall
|
|
// and subscription notifications to registered subscriptions.
|
|
func (c *Client) dispatch(codec ServerCodec) {
|
|
var (
|
|
lastOp *requestOp // tracks last send operation
|
|
reqInitLock = c.reqInit // nil while the send lock is held
|
|
conn = c.newClientConn(codec)
|
|
reading = true
|
|
)
|
|
defer func() {
|
|
close(c.closing)
|
|
if reading {
|
|
conn.close(ErrClientQuit, nil)
|
|
c.drainRead()
|
|
}
|
|
close(c.didClose)
|
|
}()
|
|
|
|
// Spawn the initial read loop.
|
|
go c.read(codec)
|
|
|
|
for {
|
|
select {
|
|
case <-c.close:
|
|
return
|
|
|
|
// Read path:
|
|
case op := <-c.readOp:
|
|
if op.batch {
|
|
conn.handler.handleBatch(op.msgs)
|
|
} else {
|
|
conn.handler.handleMsg(op.msgs[0])
|
|
}
|
|
|
|
case err := <-c.readErr:
|
|
conn.handler.log.Debug("RPC connection read error", "err", err)
|
|
conn.close(err, lastOp)
|
|
reading = false
|
|
|
|
// Reconnect:
|
|
case newcodec := <-c.reconnected:
|
|
log.Debug("RPC client reconnected", "reading", reading, "conn", newcodec.remoteAddr())
|
|
if reading {
|
|
// Wait for the previous read loop to exit. This is a rare case which
|
|
// happens if this loop isn't notified in time after the connection breaks.
|
|
// In those cases the caller will notice first and reconnect. Closing the
|
|
// handler terminates all waiting requests (closing op.resp) except for
|
|
// lastOp, which will be transferred to the new handler.
|
|
conn.close(errClientReconnected, lastOp)
|
|
c.drainRead()
|
|
}
|
|
go c.read(newcodec)
|
|
reading = true
|
|
conn = c.newClientConn(newcodec)
|
|
// Re-register the in-flight request on the new handler
|
|
// because that's where it will be sent.
|
|
conn.handler.addRequestOp(lastOp)
|
|
|
|
// Send path:
|
|
case op := <-reqInitLock:
|
|
// Stop listening for further requests until the current one has been sent.
|
|
reqInitLock = nil
|
|
lastOp = op
|
|
conn.handler.addRequestOp(op)
|
|
|
|
case err := <-c.reqSent:
|
|
if err != nil {
|
|
// Remove response handlers for the last send. When the read loop
|
|
// goes down, it will signal all other current operations.
|
|
conn.handler.removeRequestOp(lastOp)
|
|
}
|
|
// Let the next request in.
|
|
reqInitLock = c.reqInit
|
|
lastOp = nil
|
|
|
|
case op := <-c.reqTimeout:
|
|
conn.handler.removeRequestOp(op)
|
|
}
|
|
}
|
|
}
|
|
|
|
// drainRead drops read messages until an error occurs.
|
|
func (c *Client) drainRead() {
|
|
for {
|
|
select {
|
|
case <-c.readOp:
|
|
case <-c.readErr:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// read decodes RPC messages from a codec, feeding them into dispatch.
|
|
func (c *Client) read(codec ServerCodec) {
|
|
for {
|
|
msgs, batch, err := codec.readBatch()
|
|
if _, ok := err.(*json.SyntaxError); ok {
|
|
codec.writeJSON(context.Background(), errorMessage(&parseError{err.Error()}))
|
|
}
|
|
if err != nil {
|
|
c.readErr <- err
|
|
return
|
|
}
|
|
c.readOp <- readOp{msgs, batch}
|
|
}
|
|
}
|