ExecuteScriptAtBlockID Access API Method

Parameters

Script

string

REQUIRED

The Base64 encoded content of the Cadence script

Arguments

string

REQUIRED

A list of arguments each encoded as Base64 passed in the JSON-Cadence interchange format

BlockId

string

REQUIRED

The ID of the block to execute the script against

Returns

value

string

The result of the executed Cadence script

Request

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package main
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import (
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	"context"
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	"fmt"
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	"log"
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	"strconv"
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	"github.com/onflow/flow/protobuf/go/flow/access"
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)
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func main() {
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	// Requires authenticating before making the request. Refer to Intro Page on how Authentication can be done.
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	client, err := getAccessClientWithBasicAuth("ENDPOINT-NAME", "TOKEN_GOES_HERE")
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	ctx := context.Background()
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	if err != null {
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		log.Fatalf("err: %v", err)
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	}
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	// Get Latest (sealed) block
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	latestResp, err := client.GetLatestBlock(ctx, &access.GetLatestBlockRequest{IsSealed: true})
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	if err != null {
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		log.Fatal("Get latest block failed: ", err)
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	}
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	fmt.Println("Latest block height: ", latestResp.Block.Height)
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	// execute script at latest block ID
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	script := []byte(`
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		pub fun main(a: Int): Int {
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			return a + 10
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		}
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	`)
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	// Convert integer to JSON-CDC (Cadence JSON)
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	arg := 10
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	// JSON-CDC representation of an integer is a JSON object with "type" and "value" fields
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	jsonCDC := fmt.Sprintf(`{"type":"Int","value":"%s"}`, strconv.Itoa(arg))
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	// Create script arguments
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	args := [][]byte{[]byte(jsonCDC)}
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	valueHeightResp, err := client.ExecuteScriptAtBlockID(ctx, &access.ExecuteScriptAtBlockIDRequest{Script: script, Arguments: args, BlockId: latestResp.Block.Id})
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	if err != null {
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		log.Fatal("execute script at block ID failed: ", err)
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	}
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	fmt.Printf("executed script , returned %s \n", string(valueHeightResp.Value))
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}

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