mirror of
https://github.com/kaspanet/kaspad.git
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f7f44995d6
* [NOD-215] Implement difficulty adjustment algorithm * [NOD-215] Handle blocks with genesis parent, and fix adjustment factor calculation * [NOD-215] Fix tests * [NOD-215] fix calcNextRequiredDifficulty * [NOD-215] Add TestDifficulty * [NOD-215] Fix delay to be positive, and add tests for delayed blocks * [NOD-215] Split calcBlockWindowMinMaxAndMedianTimestamps to two functions * [NOD-215] Make explicit loop for padding blue block window with genesis * [NOD-215] Name return values * [NOD-215] Fix delay != 0 error messages * [NOD-215] Fix comments * [NOD-215] Fix blueBlockWindow * [NOD-215] Add TestBlueBlockWindow * [NOD-215] Rename PowLimit -> PowMax * [NOD-215] Fix delay != 0 error messages * [NOD-215] Move PowMaxBits to BlockDAG * [NOD-215] Make blockWindow type * [NOD-215] Make blueBlockWindow always pad with genesis * [NOD-215] Remove redundant line in checkWindowIDs * [NOD-215] Make medianTimestamp return error for empty window
76 lines
2.7 KiB
Go
76 lines
2.7 KiB
Go
// Copyright (c) 2014-2016 The btcsuite developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package blockdag_test
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import (
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"fmt"
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"os"
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"path/filepath"
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"github.com/daglabs/btcd/blockdag"
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"github.com/daglabs/btcd/dagconfig"
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"github.com/daglabs/btcd/database"
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_ "github.com/daglabs/btcd/database/ffldb"
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"github.com/daglabs/btcd/util"
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)
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// This example demonstrates how to create a new chain instance and use
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// ProcessBlock to attempt to add a block to the chain. As the package
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// overview documentation describes, this includes all of the Bitcoin consensus
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// rules. This example intentionally attempts to insert a duplicate genesis
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// block to illustrate how an invalid block is handled.
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func ExampleBlockDAG_ProcessBlock() {
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// Create a new database to store the accepted blocks into. Typically
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// this would be opening an existing database and would not be deleting
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// and creating a new database like this, but it is done here so this is
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// a complete working example and does not leave temporary files laying
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// around.
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dbPath := filepath.Join(os.TempDir(), "exampleprocessblock")
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_ = os.RemoveAll(dbPath)
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db, err := database.Create("ffldb", dbPath, dagconfig.MainNetParams.Net)
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if err != nil {
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fmt.Printf("Failed to create database: %v\n", err)
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return
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}
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defer os.RemoveAll(dbPath)
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defer db.Close()
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// Create a new BlockDAG instance using the underlying database for
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// the main bitcoin network. This example does not demonstrate some
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// of the other available configuration options such as specifying a
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// notification callback and signature cache. Also, the caller would
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// ordinarily keep a reference to the median time source and add time
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// values obtained from other peers on the network so the local time is
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// adjusted to be in agreement with other peers.
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chain, err := blockdag.New(&blockdag.Config{
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DB: db,
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DAGParams: &dagconfig.MainNetParams,
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TimeSource: blockdag.NewMedianTime(),
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})
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if err != nil {
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fmt.Printf("Failed to create chain instance: %v\n", err)
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return
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}
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// Process a block. For this example, we are going to intentionally
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// cause an error by trying to process the genesis block which already
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// exists.
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genesisBlock := util.NewBlock(dagconfig.MainNetParams.GenesisBlock)
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isOrphan, delay, err := chain.ProcessBlock(genesisBlock,
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blockdag.BFNone)
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if err != nil {
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fmt.Printf("Failed to process block: %v\n", err)
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return
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}
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if delay != 0 {
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fmt.Printf("Block is too far in the future")
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return
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}
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fmt.Printf("Block accepted. Is it an orphan?: %v", isOrphan)
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// Output:
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// Failed to process block: already have block 0f2bd52ea69aac311a59428cd5d17e3833e62706f68a1c7c50bef0664459229b
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}
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