blockchain: Move package to internal.

The moves the blockchain package from the blockchain module to an
internal package of the root module meaning that it is no longer a part
of the exported blockchain module.  Nearly all of the logic it provides
is really for the internal implementation of dcrd itself and thus having
it exported module significantly increases the maintenance burden.

Note that as of this change the blockchain module still exists and
provides the chaingen and fullblocktests packages both or which are
useful and used by external consumers.

This is part of a continuing overall effort to reduce the total number
of exported packages and modules and eventually get to the point it will
be possible to follow semver for the root module.

Overview of the major changes:

- Move all go files from blockchain -> internal/blockchain
- Move testdata from blockchain -> internal/blockchain
- Remove doc.go in favor of the README.md since godoc now displays it
- Move README.md from blockchain -> internal/blockchain and update to
  match the new reality
- Add a new README.md in the exported blockchain module that documents
  it contains the remaining exported packages
- Update all import paths in the repository accordingly
- Run go mod tidy on all modules

blockchain/README.md

@@ -3,96 +3,32 @@ blockchain
 
 [![Build Status](https://github.com/decred/dcrd/workflows/Build%20and%20Test/badge.svg)](https://github.com/decred/dcrd/actions)
 [![ISC License](https://img.shields.io/badge/license-ISC-blue.svg)](http://copyfree.org)
-[![Doc](https://img.shields.io/badge/doc-reference-blue.svg)](https://pkg.go.dev/github.com/decred/dcrd/blockchain/v3)
+[![Doc](https://img.shields.io/badge/doc-reference-blue.svg)](https://pkg.go.dev/github.com/decred/dcrd/blockchain/v4)
 
-Package blockchain implements Decred block handling and chain selection rules.
+The blockchain module provides a couple of packages useful for testing:
 
-The Decred block handling and chain selection rules are an integral, and quite
-likely the most important, part of Decred.  At its core, Decred is a distributed
-consensus of which blocks are valid and which ones will comprise the main block
-chain (public ledger) that ultimately determines accepted transactions, so it is
-extremely important that fully validating nodes agree on all rules.
+* [chaingen](./chaingen/README.md) - Provides facilities for generating a full
+  chain of blocks
+* [fullblocktests](./fullblocktests/README.md) - Provides a set of full block
+  tests to be used for testing the consensus validation rules
 
-At a high level, this package provides support for inserting new blocks into the
-block chain according to the aforementioned rules.  It includes functionality
-such as rejecting duplicate blocks, ensuring blocks and transactions follow all
-rules, and best chain selection along with reorganization.
+## Sub Modules
 
-Since this package does not deal with other Decred specifics such as network
-communication or wallets, it provides a notification system which gives the
-caller a high level of flexibility in how they want to react to certain events
-such as newly connected main chain blocks which might result in wallet updates.
+Note that the following separate sub modules that are not a part of the this
+module are also available:
 
-A comprehensive suite of tests is provided to ensure proper functionality.
+* [standalone](./standalone/README.md) - Provides standalone functions useful
+  for working with the Decred blockchain consensus rules.
+* [stake](./stake/doc.go) - Contains code for all of dcrd's stake transaction
+  chain handling and other portions related to the Proof-of-Stake (PoS) system.
 
-## Decred Chain Processing Overview
-
-Before a block is allowed into the block chain, it must go through an intensive
-series of validation rules.  The following list serves as a general outline of
-those rules to provide some intuition into what is going on under the hood, but
-is by no means exhaustive:
-
- - Reject duplicate blocks
- - Perform a series of sanity checks on the block and its transactions such as
-   verifying proof of work, timestamps, number and character of transactions,
-   transaction amounts, script complexity, and merkle root calculations
- - Compare the block against predetermined checkpoints for expected timestamps
-   and difficulty based on elapsed time since the checkpoint
- - Perform a series of more thorough checks that depend on the block's position
-   within the block chain such as verifying block difficulties adhere to
-   difficulty retarget rules, timestamps are after the median of the last
-   several blocks, all transactions are finalized, checkpoint blocks match, and
-   block versions are in line with the previous blocks
- - Determine how the block fits into the chain and perform different actions
-   accordingly in order to ensure any side chains which have higher difficulty
-   than the main chain become the new main chain
- - When a block is being connected to the main chain (either through
-   reorganization of a side chain to the main chain or just extending the
-   main chain), perform further checks on the block's transactions such as
-   verifying transaction duplicates, script complexity for the combination of
-   connected scripts, coinbase maturity, double spends, and connected
-   transaction values
- - Run the transaction scripts to verify the spender is allowed to spend the
-   coins
- - Insert the block into the block database
-
- ## Processing Order
-
- This package supports headers-first semantics such that block data can be
- processed out of order so long as the associated header is already known.
-
- The headers themselves, however, must be processed in the correct order since
- headers that do not properly connect are rejected.  In other words, orphan
- headers are not allowed.
-
-The processing code always maintains the best chain as the branch tip that has
-the most cumulative proof of work, so it is important to keep that in mind when
-considering errors returned from processing blocks.
-
-Notably, due to the ability to process blocks out of order, and the fact blocks
-can only be fully validated once all of their ancestors have the block data
-available, it is to be expected that no error is returned immediately for blocks
-that are valid enough to make it to the point they require the remaining
-ancestor block data to be fully validated even though they might ultimately end
-up failing validation.  Similarly, because the data for a block becoming
-available makes any of its direct descendants that already have their data
-available eligible for validation, an error being returned does not necessarily
-mean the block being processed is the one that failed validation.
 
 ## Installation and Updating
 
-This package is part of the `github.com/decred/dcrd/blockchain/v3` module.  Use
-the standard go tooling for working with modules to incorporate it.
-
-## Examples
-
-* [ProcessBlock Example](https://pkg.go.dev/github.com/decred/dcrd/blockchain/v3#example-BlockChain.ProcessBlock)
-  Demonstrates how to create a new chain instance and use ProcessBlock to
-  attempt to add a block to the chain.  This example intentionally
-  attempts to insert a duplicate genesis block to illustrate how an invalid
-  block is handled.
+This is the `github.com/decred/dcrd/blockchain/v4` module.  Use the standard go
+tooling for working with modules to incorporate it.
 
 ## License
 
-Package blockchain is licensed under the [copyfree](http://copyfree.org) ISC
+Module blockchain is licensed under the [copyfree](http://copyfree.org) ISC
 License.

blockchain/go.mod

@@ -3,34 +3,21 @@ module github.com/decred/dcrd/blockchain/v5
 go 1.17
 
 require (
-	github.com/decred/dcrd/blockchain/stake/v5 v5.0.0
-	github.com/decred/dcrd/blockchain/standalone/v2 v2.1.0
 	github.com/decred/dcrd/chaincfg/chainhash v1.0.3
 	github.com/decred/dcrd/chaincfg/v3 v3.1.1
-	github.com/decred/dcrd/crypto/blake256 v1.0.0
-	github.com/decred/dcrd/database/v3 v3.0.0
 	github.com/decred/dcrd/dcrec v1.0.0
 	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1
 	github.com/decred/dcrd/dcrutil/v4 v4.0.0
-	github.com/decred/dcrd/gcs/v4 v4.0.0
-	github.com/decred/dcrd/lru v1.1.1
 	github.com/decred/dcrd/txscript/v4 v4.0.0
 	github.com/decred/dcrd/wire v1.5.0
-	github.com/decred/slog v1.2.0
-	github.com/syndtr/goleveldb v1.0.1-0.20210819022825-2ae1ddf74ef7
 )
 
 require (
 	github.com/agl/ed25519 v0.0.0-20170116200512-5312a6153412 // indirect
 	github.com/dchest/siphash v1.2.2 // indirect
 	github.com/decred/base58 v1.0.3 // indirect
+	github.com/decred/dcrd/crypto/blake256 v1.0.0 // indirect
 	github.com/decred/dcrd/crypto/ripemd160 v1.0.1 // indirect
 	github.com/decred/dcrd/dcrec/edwards/v2 v2.0.2 // indirect
-	github.com/golang/snappy v0.0.4 // indirect
-)
-
-replace (
-	github.com/decred/dcrd/blockchain/stake/v5 => ./stake
-	github.com/decred/dcrd/blockchain/standalone/v2 => ./standalone
-	github.com/decred/dcrd/gcs/v4 => ../gcs
+	github.com/decred/slog v1.2.0 // indirect
 )

blockchain/go.sum

@@ -16,8 +16,6 @@ github.com/decred/dcrd/crypto/blake256 v1.0.0 h1:/8DMNYp9SGi5f0w7uCm6d6M4OU2rGFK
 github.com/decred/dcrd/crypto/blake256 v1.0.0/go.mod h1:sQl2p6Y26YV+ZOcSTP6thNdn47hh8kt6rqSlvmrXFAc=
 github.com/decred/dcrd/crypto/ripemd160 v1.0.1 h1:TjRL4LfftzTjXzaufov96iDAkbY2R3aTvH2YMYa1IOc=
 github.com/decred/dcrd/crypto/ripemd160 v1.0.1/go.mod h1:F0H8cjIuWTRoixr/LM3REB8obcWkmYx0gbxpQWR8RPg=
-github.com/decred/dcrd/database/v3 v3.0.0 h1:7VVN2sWjKB934jvXzjnyGJFUVH9d8Qh5VULi+NMRjek=
-github.com/decred/dcrd/database/v3 v3.0.0/go.mod h1:8EyKddB8rXDi6/CDOdYc/7qL1//sb6iwg9DctP0ZJF4=
 github.com/decred/dcrd/dcrec v1.0.0 h1:W+z6Es+Rai3MXYVoPAxYr5U1DGis0Co33scJ6uH2J6o=
 github.com/decred/dcrd/dcrec v1.0.0/go.mod h1:HIaqbEJQ+PDzQcORxnqen5/V1FR3B4VpIfmePklt8Q8=
 github.com/decred/dcrd/dcrec/edwards/v2 v2.0.2 h1:bX7rtGTMBDJxujZ29GNqtn7YCAdINjHKnA6J6tBBv6s=
@@ -26,79 +24,9 @@ github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1 h1:YLtO71vCjJRCBcrPMtQ9nqBsqpA1
 github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1/go.mod h1:hyedUtir6IdtD/7lIxGeCxkaw7y45JueMRL4DIyJDKs=
 github.com/decred/dcrd/dcrutil/v4 v4.0.0 h1:AY00fWy/ETrMHN0DNV3XUbH1aip2RG1AoTy5dp0+sJE=
 github.com/decred/dcrd/dcrutil/v4 v4.0.0/go.mod h1:QQpX5WVH3/ixVtiW15xZMe+neugXX3l2bsrYgq6nz4M=
-github.com/decred/dcrd/lru v1.1.1 h1:kWFDaW0OWx6AD6Ki342c+JPmHbiVdE6rK81pT3fuo/Y=
-github.com/decred/dcrd/lru v1.1.1/go.mod h1:mxKOwFd7lFjN2GZYsiz/ecgqR6kkYAl+0pz0tEMk218=
 github.com/decred/dcrd/txscript/v4 v4.0.0 h1:BwaBUCMCmg58MCYoBhxVjL8ZZKUIfoJuxu/djmh8h58=
 github.com/decred/dcrd/txscript/v4 v4.0.0/go.mod h1:OJtxNc5RqwQyfrRnG2gG8uMeNPo8IAJp+TD1UKXkqk8=
-github.com/decred/dcrd/wire v1.4.0/go.mod h1:WxC/0K+cCAnBh+SKsRjIX9YPgvrjhmE+6pZlel1G7Ro=
 github.com/decred/dcrd/wire v1.5.0 h1:3SgcEzSjqAMQvOugP0a8iX7yQSpiVT1yNi9bc4iOXVg=
 github.com/decred/dcrd/wire v1.5.0/go.mod h1:fzAjVqw32LkbAZIt5mnrvBR751GTa3e0rRQdOIhPY3w=
 github.com/decred/slog v1.2.0 h1:soHAxV52B54Di3WtKLfPum9OFfWqwtf/ygf9njdfnPM=
 github.com/decred/slog v1.2.0/go.mod h1:kVXlGnt6DHy2fV5OjSeuvCJ0OmlmTF6LFpEPMu/fOY0=
-github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
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-gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
-gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
-gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
-gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

blockdb.go

@@ -12,9 +12,9 @@ import (
 	"os"
 	"path/filepath"
 
-	"github.com/decred/dcrd/blockchain/v5"
 	"github.com/decred/dcrd/chaincfg/v3"
 	"github.com/decred/dcrd/database/v3"
+	"github.com/decred/dcrd/internal/blockchain"
 	"github.com/decred/dcrd/internal/progresslog"
 )
 

cmd/addblock/addblock.go

@@ -12,9 +12,9 @@ import (
 	"path/filepath"
 	"runtime"
 
-	"github.com/decred/dcrd/blockchain/v5"
-	"github.com/decred/dcrd/blockchain/v5/indexers"
 	"github.com/decred/dcrd/database/v3"
+	"github.com/decred/dcrd/internal/blockchain"
+	"github.com/decred/dcrd/internal/blockchain/indexers"
 	"github.com/decred/dcrd/internal/limits"
 	"github.com/decred/slog"
 )

cmd/addblock/import.go

@@ -14,11 +14,11 @@ import (
 	"sync"
 	"time"
 
-	"github.com/decred/dcrd/blockchain/v5"
-	"github.com/decred/dcrd/blockchain/v5/indexers"
 	"github.com/decred/dcrd/chaincfg/chainhash"
 	"github.com/decred/dcrd/database/v3"
 	"github.com/decred/dcrd/dcrutil/v4"
+	"github.com/decred/dcrd/internal/blockchain"
+	"github.com/decred/dcrd/internal/blockchain/indexers"
 	"github.com/decred/dcrd/wire"
 	"github.com/syndtr/goleveldb/leveldb"
 )

dcrd.go

@@ -17,8 +17,8 @@ import (
 	"runtime/pprof"
 	"strings"
 
-	"github.com/decred/dcrd/blockchain/v5"
-	"github.com/decred/dcrd/blockchain/v5/indexers"
+	"github.com/decred/dcrd/internal/blockchain"
+	"github.com/decred/dcrd/internal/blockchain/indexers"
 	"github.com/decred/dcrd/internal/limits"
 	"github.com/decred/dcrd/internal/version"
 )

gcs/go.sum

@@ -6,8 +6,6 @@ github.com/dchest/siphash v1.2.2 h1:9DFz8tQwl9pTVt5iok/9zKyzA1Q6bRGiF3HPiEEVr9I=
 github.com/dchest/siphash v1.2.2/go.mod h1:q+IRvb2gOSrUnYoPqHiyHXS0FOBBOdl6tONBlVnOnt4=
 github.com/decred/base58 v1.0.3 h1:KGZuh8d1WEMIrK0leQRM47W85KqCAdl2N+uagbctdDI=
 github.com/decred/base58 v1.0.3/go.mod h1:pXP9cXCfM2sFLb2viz2FNIdeMWmZDBKG3ZBYbiSM78E=
-github.com/decred/dcrd/blockchain/stake/v5 v5.0.0 h1:PwoCjCTbRvDUZKKs6N2Haus8XcbVXCJ9iGVs8C9sKwQ=
-github.com/decred/dcrd/blockchain/stake/v5 v5.0.0/go.mod h1:bOgG7YTbTOWQgtHLL2l1Y9gBHIuM86zwVcQtsoGlZlQ=
 github.com/decred/dcrd/chaincfg/chainhash v1.0.2/go.mod h1:BpbrGgrPTr3YJYRN3Bm+D9NuaFd+zGyNeIKgrhCXK60=
 github.com/decred/dcrd/chaincfg/chainhash v1.0.3 h1:PF2czcYZGW3dz4i/35AUfVAgnqHl9TMNQt1ADTYGOoE=
 github.com/decred/dcrd/chaincfg/chainhash v1.0.3/go.mod h1:BpbrGgrPTr3YJYRN3Bm+D9NuaFd+zGyNeIKgrhCXK60=

go.mod

@@ -15,6 +15,7 @@ require (
 	github.com/decred/dcrd/chaincfg/v3 v3.1.1
 	github.com/decred/dcrd/connmgr/v3 v3.1.0
 	github.com/decred/dcrd/container/apbf v1.0.0
+	github.com/decred/dcrd/crypto/blake256 v1.0.0
 	github.com/decred/dcrd/crypto/ripemd160 v1.0.1
 	github.com/decred/dcrd/database/v3 v3.0.0
 	github.com/decred/dcrd/dcrec v1.0.0
@@ -44,7 +45,6 @@ require (
 require (
 	github.com/agl/ed25519 v0.0.0-20170116200512-5312a6153412 // indirect
 	github.com/dchest/siphash v1.2.2 // indirect
-	github.com/decred/dcrd/crypto/blake256 v1.0.0 // indirect
 	github.com/decred/dcrd/dcrec/edwards/v2 v2.0.2 // indirect
 	github.com/golang/snappy v0.0.4 // indirect
 )