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rpc: make ExampleClientSubscription work with the geth API (#19483) 

This corrects the call to eth_getBlockByNumber, which previously
returned this error:

  can't get latest block: missing value for required argument 1

Co-authored-by: Felix Lange <fjl@twurst.com>
This commit is contained in:
Julian Y 2020-04-27 08:25:24 -07:00 committed by GitHub
parent ba068d40dd
commit 5c3993444d
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 6 additions and 5 deletions
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11
rpc/client_example_test.go
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@ -19,9 +19,9 @@ package rpc_test
import ( import (
"context" "context"
"fmt" "fmt"
"math/big"
"time" "time"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/rpc" "github.com/ethereum/go-ethereum/rpc"
) )
@ -31,16 +31,16 @@ import (
// eth_getBlockByNumber("latest", {}) // eth_getBlockByNumber("latest", {})
// returns the latest block object. // returns the latest block object.
// //
// eth_subscribe("newBlocks") // eth_subscribe("newHeads")
// creates a subscription which fires block objects when new blocks arrive. // creates a subscription which fires block objects when new blocks arrive.
type Block struct { type Block struct {
Number *big.Int Number *hexutil.Big
} }
func ExampleClientSubscription() { func ExampleClientSubscription() {
// Connect the client. // Connect the client.
client, _ := rpc.Dial("ws://127.0.0.1:8485") client, _ := rpc.Dial("ws://127.0.0.1:8545")
subch := make(chan Block) subch := make(chan Block)
// Ensure that subch receives the latest block. // Ensure that subch receives the latest block.
@ -75,7 +75,8 @@ func subscribeBlocks(client *rpc.Client, subch chan Block) {
// The connection is established now. // The connection is established now.
// Update the channel with the current block. // Update the channel with the current block.
var lastBlock Block var lastBlock Block
if err := client.CallContext(ctx, &lastBlock, "eth_getBlockByNumber", "latest"); err != nil { err = client.CallContext(ctx, &lastBlock, "eth_getBlockByNumber", "latest", false)
if err != nil {
fmt.Println("can't get latest block:", err) fmt.Println("can't get latest block:", err)
return return
} }