245f3146c2
New APIs added:
client.RegisterName(namespace, service) // makes service available to server
client.Notify(ctx, method, args...) // sends a notification
ClientFromContext(ctx) // to get a client in handler method
This is essentially a rewrite of the server-side code. JSON-RPC
processing code is now the same on both server and client side. Many
minor issues were fixed in the process and there is a new test suite for
JSON-RPC spec compliance (and non-compliance in some cases).
List of behavior changes:
- Method handlers are now called with a per-request context instead of a
per-connection context. The context is canceled right after the method
returns.
- Subscription error channels are always closed when the connection
ends. There is no need to also wait on the Notifier's Closed channel
to detect whether the subscription has ended.
- Client now omits "params" instead of sending "params": null when there
are no arguments to a call. The previous behavior was not compliant
with the spec. The server still accepts "params": null.
- Floating point numbers are allowed as "id". The spec doesn't allow
them, but we handle request "id" as json.RawMessage and guarantee that
the same number will be sent back.
- Logging is improved significantly. There is now a message at DEBUG
level for each RPC call served.
57 lines
1.9 KiB
Go
57 lines
1.9 KiB
Go
// Copyright 2015 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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"context"
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"net"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/p2p/netutil"
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)
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// ServeListener accepts connections on l, serving JSON-RPC on them.
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func (s *Server) ServeListener(l net.Listener) error {
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for {
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conn, err := l.Accept()
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if netutil.IsTemporaryError(err) {
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log.Warn("RPC accept error", "err", err)
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continue
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} else if err != nil {
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return err
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}
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log.Trace("Accepted RPC connection", "conn", conn.RemoteAddr())
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go s.ServeCodec(NewJSONCodec(conn), OptionMethodInvocation|OptionSubscriptions)
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}
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}
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// DialIPC create a new IPC client that connects to the given endpoint. On Unix it assumes
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// the endpoint is the full path to a unix socket, and Windows the endpoint is an
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// identifier for a named pipe.
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//
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// The context is used for the initial connection establishment. It does not
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// affect subsequent interactions with the client.
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func DialIPC(ctx context.Context, endpoint string) (*Client, error) {
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return newClient(ctx, func(ctx context.Context) (ServerCodec, error) {
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conn, err := newIPCConnection(ctx, endpoint)
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if err != nil {
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return nil, err
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}
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return NewJSONCodec(conn), err
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})
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}
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