block_info_test.go

/*
 * Flow Emulator
 *
 * Copyright 2019-2022 Dapper Labs, Inc.
 *
 * 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 emulator_test

import (
	"fmt"
	"testing"

	"github.com/onflow/flow-go-sdk"
	flowgo "github.com/onflow/flow-go/model/flow"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	emulator "github.com/onflow/flow-emulator"
)

func TestBlockInfo(t *testing.T) {

	t.Parallel()

	b, err := emulator.NewBlockchain()
	require.NoError(t, err)

	block1, err := b.CommitBlock()
	require.NoError(t, err)

	block2, err := b.CommitBlock()
	require.NoError(t, err)

	t.Run("works as transaction", func(t *testing.T) {
		tx := flow.NewTransaction().
			SetScript([]byte(`
				transaction {
					execute {
						let block = getCurrentBlock()
						log(block)

						let lastBlock = getBlock(at: block.height - UInt64(1))
						log(lastBlock)
					}
				}
			`)).
			SetGasLimit(flowgo.DefaultMaxTransactionGasLimit).
			SetProposalKey(b.ServiceKey().Address, b.ServiceKey().Index, b.ServiceKey().SequenceNumber).
			SetPayer(b.ServiceKey().Address)

		err = tx.SignEnvelope(b.ServiceKey().Address, b.ServiceKey().Index, b.ServiceKey().Signer())
		assert.NoError(t, err)

		err = b.AddTransaction(*tx)
		require.NoError(t, err)

		result, err := b.ExecuteNextTransaction()
		assert.NoError(t, err)
		assertTransactionSucceeded(t, result)

		require.Len(t, result.Logs, 2)
		assert.Equal(t, fmt.Sprintf("Block(height: %v, view: %v, id: 0x%x, timestamp: %.8f)", block2.Header.Height+1,
			b.PendingBlockView(), b.PendingBlockID(), float64(b.PendingBlockTimestamp().Unix())), result.Logs[0])
		assert.Equal(t, fmt.Sprintf("Block(height: %v, view: %v, id: 0x%x, timestamp: %.8f)", block2.Header.Height,
			block2.Header.View, block2.ID(), float64(block2.Header.Timestamp.Unix())), result.Logs[1])
	})

	t.Run("works as script", func(t *testing.T) {
		script := []byte(`
			pub fun main() {
				let block = getCurrentBlock()
				log(block)

				let lastBlock = getBlock(at: block.height - UInt64(1))
				log(lastBlock)
			}
		`)

		result, err := b.ExecuteScript(script, nil)
		assert.NoError(t, err)

		assert.True(t, result.Succeeded())

		require.Len(t, result.Logs, 2)
		assert.Equal(t, fmt.Sprintf("Block(height: %v, view: %v, id: 0x%x, timestamp: %.8f)", block2.Header.Height,
			block2.Header.View, block2.ID(), float64(block2.Header.Timestamp.Unix())), result.Logs[0])
		assert.Equal(t, fmt.Sprintf("Block(height: %v, view: %v, id: 0x%x, timestamp: %.8f)", block1.Header.Height,
			block1.Header.View, block1.ID(), float64(block1.Header.Timestamp.Unix())), result.Logs[1])
	})
}