github.com/stafiprotocol/go-substrate-rpc-client@v1.4.7/teste2e/chain_subscribe_finalized_heads_test.go (about)

     1  // Go Substrate RPC Client (GSRPC) provides APIs and types around Polkadot and any Substrate-based chain RPC calls
     2  //
     3  // Copyright 2020 Stafi Protocol
     4  //
     5  // Licensed under the Apache License, Version 2.0 (the "License");
     6  // you may not use this file except in compliance with the License.
     7  // You may obtain a copy of the License at
     8  //
     9  //     http://www.apache.org/licenses/LICENSE-2.0
    10  //
    11  // Unless required by applicable law or agreed to in writing, software
    12  // distributed under the License is distributed on an "AS IS" BASIS,
    13  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14  // See the License for the specific language governing permissions and
    15  // limitations under the License.
    16  
    17  package teste2e
    18  
    19  import (
    20  	"fmt"
    21  	"testing"
    22  	"time"
    23  
    24  	"github.com/stafiprotocol/go-substrate-rpc-client/config"
    25  	"github.com/stafiprotocol/go-substrate-rpc-client/rpc"
    26  	"github.com/stretchr/testify/assert"
    27  )
    28  
    29  func TestChain_SubscribeFinalizedHeads(t *testing.T) {
    30  	if testing.Short() {
    31  		t.Skip("skipping end-to-end test in short mode.")
    32  	}
    33  
    34  	rpcs, err := rpc.NewRPCS(config.Default().RPCURL)
    35  	if err != nil {
    36  		panic(err)
    37  	}
    38  	sub, err := rpcs.Chain.SubscribeFinalizedHeads()
    39  	if err != nil {
    40  		panic(err)
    41  	}
    42  	defer sub.Unsubscribe()
    43  
    44  	timeout := time.After(10 * time.Second)
    45  	received := 0
    46  
    47  	for {
    48  		select {
    49  		case head := <-sub.Chan():
    50  			fmt.Printf("%#v\n", head)
    51  			received++
    52  
    53  			if received >= 2 {
    54  				return
    55  			}
    56  		case <-timeout:
    57  			assert.FailNow(t, "timeout reached without getting 2 notifications from subscription")
    58  			return
    59  		}
    60  	}
    61  }