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.
55 lines
1.5 KiB
Go
55 lines
1.5 KiB
Go
// Copyright 2018 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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"errors"
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"net"
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"os"
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"time"
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)
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// DialStdIO creates a client on stdin/stdout.
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func DialStdIO(ctx context.Context) (*Client, error) {
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return newClient(ctx, func(_ context.Context) (ServerCodec, error) {
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return NewJSONCodec(stdioConn{}), nil
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})
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}
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type stdioConn struct{}
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func (io stdioConn) Read(b []byte) (n int, err error) {
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return os.Stdin.Read(b)
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}
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func (io stdioConn) Write(b []byte) (n int, err error) {
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return os.Stdout.Write(b)
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}
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func (io stdioConn) Close() error {
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return nil
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}
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func (io stdioConn) RemoteAddr() string {
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return "/dev/stdin"
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}
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func (io stdioConn) SetWriteDeadline(t time.Time) error {
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return &net.OpError{Op: "set", Net: "stdio", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
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}
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