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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"
"log"
"github.com/centrifuge/go-substrate-rpc-client/config"
gethrpc "github.com/centrifuge/go-substrate-rpc-client/gethrpc"
"github.com/centrifuge/go-substrate-rpc-client/types"
)
type Client interface {
Call(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
}
type client struct {
gethrpc.Client
url string
// metadataVersioned is the metadata cache to prevent unnecessary requests
//metadataVersioned *MetadataVersioned
//metadataLock sync.RWMutex
}
// URL returns the URL the client connects to
func (c client) URL() string {
return c.url
}
// TODO move to State struct
//func (c *client) MetaData(cache bool) (m *MetadataVersioned, err error) {
// if cache && c.metadataVersioned != nil {
// c.metadataLock.RLock()
// defer c.metadataLock.RUnlock()
// m = c.metadataVersioned
// } else {
// s := NewStateRPC(c)
// m, err = s.MetaData(nil)
// if err != nil {
// return nil, err
// }
// // set cache
// c.metadataLock.Lock()
// defer c.metadataLock.Unlock()
// c.metadataVersioned = m
// }
// return
//}
// Connect connects to the provided url
func Connect(url string) (Client, error) {
log.Printf("Connecting to %v...", url)
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 {
if blockHash == nil {
err := c.Call(target, method, args...)
if err != nil {
return err
}
return nil
}
hexHash, err := types.Hex(*blockHash)
if err != nil {
return err
}
hargs := append(args, hexHash)
err = c.Call(target, method, hargs...)
if err != nil {
return err
}
return nil
}