path: root/les/handler_test.go

// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package les

import (
    "math/rand"
    "testing"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/core"
    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/crypto"
    "github.com/ethereum/go-ethereum/eth/downloader"
    "github.com/ethereum/go-ethereum/ethdb"
    "github.com/ethereum/go-ethereum/p2p"
    "github.com/ethereum/go-ethereum/rlp"
    "github.com/ethereum/go-ethereum/trie"
)

func expectResponse(r p2p.MsgReader, msgcode, reqID, bv uint64, data interface{}) error {
    type resp struct {
        ReqID, BV uint64
        Data      interface{}
    }
    return p2p.ExpectMsg(r, msgcode, resp{reqID, bv, data})
}

// Tests that block headers can be retrieved from a remote chain based on user queries.
func TestGetBlockHeadersLes1(t *testing.T) { testGetBlockHeaders(t, 1) }

func testGetBlockHeaders(t *testing.T, protocol int) {
    db, _ := ethdb.NewMemDatabase()
    pm := newTestProtocolManagerMust(t, false, downloader.MaxHashFetch+15, nil, nil, nil, db)
    bc := pm.blockchain.(*core.BlockChain)
    peer, _ := newTestPeer(t, "peer", protocol, pm, true)
    defer peer.close()

    // Create a "random" unknown hash for testing
    var unknown common.Hash
    for i := range unknown {
        unknown[i] = byte(i)
    }
    // Create a batch of tests for various scenarios
    limit := uint64(MaxHeaderFetch)
    tests := []struct {
        query  *getBlockHeadersData // The query to execute for header retrieval
        expect []common.Hash        // The hashes of the block whose headers are expected
    }{
        // A single random block should be retrievable by hash and number too
        {
            &getBlockHeadersData{Origin: hashOrNumber{Hash: bc.GetBlockByNumber(limit / 2).Hash()}, Amount: 1},
            []common.Hash{bc.GetBlockByNumber(limit / 2).Hash()},
        }, {
            &getBlockHeadersData{Origin: hashOrNumber{Number: limit / 2}, Amount: 1},
            []common.Hash{bc.GetBlockByNumber(limit / 2).Hash()},
        },
        // Multiple headers should be retrievable in both directions
        {
            &getBlockHeadersData{Origin: hashOrNumber{Number: limit / 2}, Amount: 3},
            []common.Hash{
                bc.GetBlockByNumber(limit / 2).Hash(),
                bc.GetBlockByNumber(limit/2 + 1).Hash(),
                bc.GetBlockByNumber(limit/2 + 2).Hash(),
            },
        }, {
            &getBlockHeadersData{Origin: hashOrNumber{Number: limit / 2}, Amount: 3, Reverse: true},
            []common.Hash{
                bc.GetBlockByNumber(limit / 2).Hash(),
                bc.GetBlockByNumber(limit/2 - 1).Hash(),
                bc.GetBlockByNumber(limit/2 - 2).Hash(),
            },
        },
        // Multiple headers with skip lists should be retrievable
        {
            &getBlockHeadersData{Origin: hashOrNumber{Number: limit / 2}, Skip: 3, Amount: 3},
            []common.Hash{
                bc.GetBlockByNumber(limit / 2).Hash(),
                bc.GetBlockByNumber(limit/2 + 4).Hash(),
                bc.GetBlockByNumber(limit/2 + 8).Hash(),
            },
        }, {
            &getBlockHeadersData{Origin: hashOrNumber{Number: limit / 2}, Skip: 3, Amount: 3, Reverse: true},
            []common.Hash{
                bc.GetBlockByNumber(limit / 2).Hash(),
                bc.GetBlockByNumber(limit/2 - 4).Hash(),
                bc.GetBlockByNumber(limit/2 - 8).Hash(),
            },
        },
        // The chain endpoints should be retrievable
        {
            &getBlockHeadersData{Origin: hashOrNumber{Number: 0}, Amount: 1},
            []common.Hash{bc.GetBlockByNumber(0).Hash()},
        }, {
            &getBlockHeadersData{Origin: hashOrNumber{Number: bc.CurrentBlock().NumberU64()}, Amount: 1},
            []common.Hash{bc.CurrentBlock().Hash()},
        },
        // Ensure protocol limits are honored
        /*{
            &getBlockHeadersData{Origin: hashOrNumber{Number: bc.CurrentBlock().NumberU64() - 1}, Amount: limit + 10, Reverse: true},
            bc.GetBlockHashesFromHash(bc.CurrentBlock().Hash(), limit),
        },*/
        // Check that requesting more than available is handled gracefully
        {
            &getBlockHeadersData{Origin: hashOrNumber{Number: bc.CurrentBlock().NumberU64() - 4}, Skip: 3, Amount: 3},
            []common.Hash{
                bc.GetBlockByNumber(bc.CurrentBlock().NumberU64() - 4).Hash(),
                bc.GetBlockByNumber(bc.CurrentBlock().NumberU64()).Hash(),
            },
        }, {
            &getBlockHeadersData{Origin: hashOrNumber{Number: 4}, Skip: 3, Amount: 3, Reverse: true},
            []common.Hash{
                bc.GetBlockByNumber(4).Hash(),
                bc.GetBlockByNumber(0).Hash(),
            },
        },
        // Check that requesting more than available is handled gracefully, even if mid skip
        {
            &getBlockHeadersData{Origin: hashOrNumber{Number: bc.CurrentBlock().NumberU64() - 4}, Skip: 2, Amount: 3},
            []common.Hash{
                bc.GetBlockByNumber(bc.CurrentBlock().NumberU64() - 4).Hash(),
                bc.GetBlockByNumber(bc.CurrentBlock().NumberU64() - 1).Hash(),
            },
        }, {
            &getBlockHeadersData{Origin: hashOrNumber{Number: 4}, Skip: 2, Amount: 3, Reverse: true},
            []common.Hash{
                bc.GetBlockByNumber(4).Hash(),
                bc.GetBlockByNumber(1).Hash(),
            },
        },
        // Check that non existing headers aren't returned
        {
            &getBlockHeadersData{Origin: hashOrNumber{Hash: unknown}, Amount: 1},
            []common.Hash{},
        }, {
            &getBlockHeadersData{Origin: hashOrNumber{Number: bc.CurrentBlock().NumberU64() + 1}, Amount: 1},
            []common.Hash{},
        },
    }
    // Run each of the tests and verify the results against the chain
    var reqID uint64
    for i, tt := range tests {
        // Collect the headers to expect in the response
        headers := []*types.Header{}
        for _, hash := range tt.expect {
            headers = append(headers, bc.GetHeaderByHash(hash))
        }
        // Send the hash request and verify the response
        reqID++
        cost := peer.GetRequestCost(GetBlockHeadersMsg, int(tt.query.Amount))
        sendRequest(peer.app, GetBlockHeadersMsg, reqID, cost, tt.query)
        if err := expectResponse(peer.app, BlockHeadersMsg, reqID, testBufLimit, headers); err != nil {
            t.Errorf("test %d: headers mismatch: %v", i, err)
        }
    }
}

// Tests that block contents can be retrieved from a remote chain based on their hashes.
func TestGetBlockBodiesLes1(t *testing.T) { testGetBlockBodies(t, 1) }

func testGetBlockBodies(t *testing.T, protocol int) {
    db, _ := ethdb.NewMemDatabase()
    pm := newTestProtocolManagerMust(t, false, downloader.MaxBlockFetch+15, nil, nil, nil, db)
    bc := pm.blockchain.(*core.BlockChain)
    peer, _ := newTestPeer(t, "peer", protocol, pm, true)
    defer peer.close()

    // Create a batch of tests for various scenarios
    limit := MaxBodyFetch
    tests := []struct {
        random    int           // Number of blocks to fetch randomly from the chain
        explicit  []common.Hash // Explicitly requested blocks
        available []bool        // Availability of explicitly requested blocks
        expected  int           // Total number of existing blocks to expect
    }{
        {1, nil, nil, 1},         // A single random block should be retrievable
        {10, nil, nil, 10},       // Multiple random blocks should be retrievable
        {limit, nil, nil, limit}, // The maximum possible blocks should be retrievable
        //{limit + 1, nil, nil, limit},                                  // No more than the possible block count should be returned
        {0, []common.Hash{bc.Genesis().Hash()}, []bool{true}, 1},      // The genesis block should be retrievable
        {0, []common.Hash{bc.CurrentBlock().Hash()}, []bool{true}, 1}, // The chains head block should be retrievable
        {0, []common.Hash{{}}, []bool{false}, 0},                      // A non existent block should not be returned

        // Existing and non-existing blocks interleaved should not cause problems
        {0, []common.Hash{
            {},
            bc.GetBlockByNumber(1).Hash(),
            {},
            bc.GetBlockByNumber(10).Hash(),
            {},
            bc.GetBlockByNumber(100).Hash(),
            {},
        }, []bool{false, true, false, true, false, true, false}, 3},
    }
    // Run each of the tests and verify the results against the chain
    var reqID uint64
    for i, tt := range tests {
        // Collect the hashes to request, and the response to expect
        hashes, seen := []common.Hash{}, make(map[int64]bool)
        bodies := []*types.Body{}

        for j := 0; j < tt.random; j++ {
            for {
                num := rand.Int63n(int64(bc.CurrentBlock().NumberU64()))
                if !seen[num] {
                    seen[num] = true

                    block := bc.GetBlockByNumber(uint64(num))
                    hashes = append(hashes, block.Hash())
                    if len(bodies) < tt.expected {
                        bodies = append(bodies, &types.Body{Transactions: block.Transactions(), Uncles: block.Uncles()})
                    }
                    break
                }
            }
        }
        for j, hash := range tt.explicit {
            hashes = append(hashes, hash)
            if tt.available[j] && len(bodies) < tt.expected {
                block := bc.GetBlockByHash(hash)
                bodies = append(bodies, &types.Body{Transactions: block.Transactions(), Uncles: block.Uncles()})
            }
        }
        reqID++
        // Send the hash request and verify the response
        cost := peer.GetRequestCost(GetBlockBodiesMsg, len(hashes))
        sendRequest(peer.app, GetBlockBodiesMsg, reqID, cost, hashes)
        if err := expectResponse(peer.app, BlockBodiesMsg, reqID, testBufLimit, bodies); err != nil {
            t.Errorf("test %d: bodies mismatch: %v", i, err)
        }
    }
}

// Tests that the contract codes can be retrieved based on account addresses.
func TestGetCodeLes1(t *testing.T) { testGetCode(t, 1) }

func testGetCode(t *testing.T, protocol int) {
    // Assemble the test environment
    db, _ := ethdb.NewMemDatabase()
    pm := newTestProtocolManagerMust(t, false, 4, testChainGen, nil, nil, db)
    bc := pm.blockchain.(*core.BlockChain)
    peer, _ := newTestPeer(t, "peer", protocol, pm, true)
    defer peer.close()

    var codereqs []*CodeReq
    var codes [][]byte

    for i := uint64(0); i <= bc.CurrentBlock().NumberU64(); i++ {
        header := bc.GetHeaderByNumber(i)
        req := &CodeReq{
            BHash:  header.Hash(),
            AccKey: crypto.Keccak256(testContractAddr[:]),
        }
        codereqs = append(codereqs, req)
        if i >= testContractDeployed {
            codes = append(codes, testContractCodeDeployed)
        }
    }

    cost := peer.GetRequestCost(GetCodeMsg, len(codereqs))
    sendRequest(peer.app, GetCodeMsg, 42, cost, codereqs)
    if err := expectResponse(peer.app, CodeMsg, 42, testBufLimit, codes); err != nil {
        t.Errorf("codes mismatch: %v", err)
    }
}

// Tests that the transaction receipts can be retrieved based on hashes.
func TestGetReceiptLes1(t *testing.T) { testGetReceipt(t, 1) }

func testGetReceipt(t *testing.T, protocol int) {
    // Assemble the test environment
    db, _ := ethdb.NewMemDatabase()
    pm := newTestProtocolManagerMust(t, false, 4, testChainGen, nil, nil, db)
    bc := pm.blockchain.(*core.BlockChain)
    peer, _ := newTestPeer(t, "peer", protocol, pm, true)
    defer peer.close()

    // Collect the hashes to request, and the response to expect
    hashes, receipts := []common.Hash{}, []types.Receipts{}
    for i := uint64(0); i <= bc.CurrentBlock().NumberU64(); i++ {
        block := bc.GetBlockByNumber(i)

        hashes = append(hashes, block.Hash())
        receipts = append(receipts, core.GetBlockReceipts(db, block.Hash(), block.NumberU64()))
    }
    // Send the hash request and verify the response
    cost := peer.GetRequestCost(GetReceiptsMsg, len(hashes))
    sendRequest(peer.app, GetReceiptsMsg, 42, cost, hashes)
    if err := expectResponse(peer.app, ReceiptsMsg, 42, testBufLimit, receipts); err != nil {
        t.Errorf("receipts mismatch: %v", err)
    }
}

// Tests that trie merkle proofs can be retrieved
func TestGetProofsLes1(t *testing.T) { testGetReceipt(t, 1) }

func testGetProofs(t *testing.T, protocol int) {
    // Assemble the test environment
    db, _ := ethdb.NewMemDatabase()
    pm := newTestProtocolManagerMust(t, false, 4, testChainGen, nil, nil, db)
    bc := pm.blockchain.(*core.BlockChain)
    peer, _ := newTestPeer(t, "peer", protocol, pm, true)
    defer peer.close()

    var proofreqs []ProofReq
    var proofs [][]rlp.RawValue

    accounts := []common.Address{testBankAddress, acc1Addr, acc2Addr, {}}
    for i := uint64(0); i <= bc.CurrentBlock().NumberU64(); i++ {
        header := bc.GetHeaderByNumber(i)
        root := header.Root
        trie, _ := trie.New(root, db)

        for _, acc := range accounts {
            req := ProofReq{
                BHash: header.Hash(),
                Key:   acc[:],
            }
            proofreqs = append(proofreqs, req)

            proof := trie.Prove(crypto.Keccak256(acc[:]))
            proofs = append(proofs, proof)
        }
    }
    // Send the proof request and verify the response
    cost := peer.GetRequestCost(GetProofsMsg, len(proofreqs))
    sendRequest(peer.app, GetProofsMsg, 42, cost, proofreqs)
    if err := expectResponse(peer.app, ProofsMsg, 42, testBufLimit, proofs); err != nil {
        t.Errorf("proofs mismatch: %v", err)
    }
}