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client.go
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client.go
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// Go Substrate RPC Client (GSRPC) provides APIs and types around Polkadot and any Substrate-based chain RPC calls
//
// Copyright 2019 Centrifuge GmbH
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package client
import (
"context"
"github.com/Cerebellum-Network/go-substrate-rpc-client/v9/config"
gethrpc "github.com/Cerebellum-Network/go-substrate-rpc-client/v9/gethrpc"
"github.com/Cerebellum-Network/go-substrate-rpc-client/v9/types"
"github.com/Cerebellum-Network/go-substrate-rpc-client/v9/types/codec"
)
//go:generate mockery --name Client
type Client interface {
// Call makes the call to RPC method with the provided args
// args must be encoded in the format RPC understands
Call(result interface{}, method string, args ...interface{}) error
CallContext(
ctx context.Context,
result interface{},
method string,
args ...interface{},
) error
Subscribe(
ctx context.Context,
namespace, subscribeMethodSuffix, unsubscribeMethodSuffix,
notificationMethodSuffix string,
channel interface{},
args ...interface{},
) (*gethrpc.ClientSubscription, error)
URL() string
Close()
}
type client struct {
gethrpc.Client
url string
}
// URL returns the URL the client connects to
func (c client) URL() string {
return c.url
}
func (c client) Close() {
c.Client.Close()
}
// Connect connects to the provided url
func Connect(url string) (Client, error) {
ctx, cancel := context.WithTimeout(context.Background(), config.Default().DialTimeout)
defer cancel()
c, err := gethrpc.DialContext(ctx, url)
if err != nil {
return nil, err
}
cc := client{*c, url}
return &cc, nil
}
func CallWithBlockHash(c Client, target interface{}, method string, blockHash *types.Hash, args ...interface{}) error {
ctx := context.Background()
return CallWithBlockHashContext(ctx, c, target, method, blockHash, args...)
}
func CallWithBlockHashContext(
ctx context.Context,
c Client,
target interface{},
method string,
blockHash *types.Hash,
args ...interface{},
) error {
if blockHash == nil {
err := c.CallContext(ctx, target, method, args...)
if err != nil {
return err
}
return nil
}
hexHash, err := codec.Hex(*blockHash)
if err != nil {
return err
}
args = append(args, hexHash)
err = c.CallContext(ctx, target, method, args...)
if err != nil {
return err
}
return nil
}