lbcd/blockchain/error.go

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blockchain: Rework to use new db interface. This commit is the first stage of several that are planned to convert the blockchain package into a concurrent safe package that will ultimately allow support for multi-peer download and concurrent chain processing. The goal is to update btcd proper after each step so it can take advantage of the enhancements as they are developed. In addition to the aforementioned benefit, this staged approach has been chosen since it is absolutely critical to maintain consensus. Separating the changes into several stages makes it easier for reviewers to logically follow what is happening and therefore helps prevent consensus bugs. Naturally there are significant automated tests to help prevent consensus issues as well. The main focus of this stage is to convert the blockchain package to use the new database interface and implement the chain-related functionality which it no longer handles. It also aims to improve efficiency in various areas by making use of the new database and chain capabilities. The following is an overview of the chain changes: - Update to use the new database interface - Add chain-related functionality that the old database used to handle - Main chain structure and state - Transaction spend tracking - Implement a new pruned unspent transaction output (utxo) set - Provides efficient direct access to the unspent transaction outputs - Uses a domain specific compression algorithm that understands the standard transaction scripts in order to significantly compress them - Removes reliance on the transaction index and paves the way toward eventually enabling block pruning - Modify the New function to accept a Config struct instead of inidividual parameters - Replace the old TxStore type with a new UtxoViewpoint type that makes use of the new pruned utxo set - Convert code to treat the new UtxoViewpoint as a rolling view that is used between connects and disconnects to improve efficiency - Make best chain state always set when the chain instance is created - Remove now unnecessary logic for dealing with unset best state - Make all exported functions concurrent safe - Currently using a single chain state lock as it provides a straight forward and easy to review path forward however this can be improved with more fine grained locking - Optimize various cases where full blocks were being loaded when only the header is needed to help reduce the I/O load - Add the ability for callers to get a snapshot of the current best chain stats in a concurrent safe fashion - Does not block callers while new blocks are being processed - Make error messages that reference transaction outputs consistently use <transaction hash>:<output index> - Introduce a new AssertError type an convert internal consistency checks to use it - Update tests and examples to reflect the changes - Add a full suite of tests to ensure correct functionality of the new code The following is an overview of the btcd changes: - Update to use the new database and chain interfaces - Temporarily remove all code related to the transaction index - Temporarily remove all code related to the address index - Convert all code that uses transaction stores to use the new utxo view - Rework several calls that required the block manager for safe concurrency to use the chain package directly now that it is concurrent safe - Change all calls to obtain the best hash to use the new best state snapshot capability from the chain package - Remove workaround for limits on fetching height ranges since the new database interface no longer imposes them - Correct the gettxout RPC handler to return the best chain hash as opposed the hash the txout was found in - Optimize various RPC handlers: - Change several of the RPC handlers to use the new chain snapshot capability to avoid needlessly loading data - Update several handlers to use new functionality to avoid accessing the block manager so they are able to return the data without blocking when the server is busy processing blocks - Update non-verbose getblock to avoid deserialization and serialization overhead - Update getblockheader to request the block height directly from chain and only load the header - Update getdifficulty to use the new cached data from chain - Update getmininginfo to use the new cached data from chain - Update non-verbose getrawtransaction to avoid deserialization and serialization overhead - Update gettxout to use the new utxo store versus loading full transactions using the transaction index The following is an overview of the utility changes: - Update addblock to use the new database and chain interfaces - Update findcheckpoint to use the new database and chain interfaces - Remove the dropafter utility which is no longer supported NOTE: The transaction index and address index will be reimplemented in another commit.
2015-08-26 06:03:18 +02:00
// Copyright (c) 2014-2016 The btcsuite developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package blockchain
import (
"fmt"
)
// DeploymentError identifies an error that indicates a deployment ID was
// specified that does not exist.
type DeploymentError uint32
// Error returns the assertion error as a human-readable string and satisfies
// the error interface.
func (e DeploymentError) Error() string {
return fmt.Sprintf("deployment ID %d does not exist", uint32(e))
}
blockchain: Rework to use new db interface. This commit is the first stage of several that are planned to convert the blockchain package into a concurrent safe package that will ultimately allow support for multi-peer download and concurrent chain processing. The goal is to update btcd proper after each step so it can take advantage of the enhancements as they are developed. In addition to the aforementioned benefit, this staged approach has been chosen since it is absolutely critical to maintain consensus. Separating the changes into several stages makes it easier for reviewers to logically follow what is happening and therefore helps prevent consensus bugs. Naturally there are significant automated tests to help prevent consensus issues as well. The main focus of this stage is to convert the blockchain package to use the new database interface and implement the chain-related functionality which it no longer handles. It also aims to improve efficiency in various areas by making use of the new database and chain capabilities. The following is an overview of the chain changes: - Update to use the new database interface - Add chain-related functionality that the old database used to handle - Main chain structure and state - Transaction spend tracking - Implement a new pruned unspent transaction output (utxo) set - Provides efficient direct access to the unspent transaction outputs - Uses a domain specific compression algorithm that understands the standard transaction scripts in order to significantly compress them - Removes reliance on the transaction index and paves the way toward eventually enabling block pruning - Modify the New function to accept a Config struct instead of inidividual parameters - Replace the old TxStore type with a new UtxoViewpoint type that makes use of the new pruned utxo set - Convert code to treat the new UtxoViewpoint as a rolling view that is used between connects and disconnects to improve efficiency - Make best chain state always set when the chain instance is created - Remove now unnecessary logic for dealing with unset best state - Make all exported functions concurrent safe - Currently using a single chain state lock as it provides a straight forward and easy to review path forward however this can be improved with more fine grained locking - Optimize various cases where full blocks were being loaded when only the header is needed to help reduce the I/O load - Add the ability for callers to get a snapshot of the current best chain stats in a concurrent safe fashion - Does not block callers while new blocks are being processed - Make error messages that reference transaction outputs consistently use <transaction hash>:<output index> - Introduce a new AssertError type an convert internal consistency checks to use it - Update tests and examples to reflect the changes - Add a full suite of tests to ensure correct functionality of the new code The following is an overview of the btcd changes: - Update to use the new database and chain interfaces - Temporarily remove all code related to the transaction index - Temporarily remove all code related to the address index - Convert all code that uses transaction stores to use the new utxo view - Rework several calls that required the block manager for safe concurrency to use the chain package directly now that it is concurrent safe - Change all calls to obtain the best hash to use the new best state snapshot capability from the chain package - Remove workaround for limits on fetching height ranges since the new database interface no longer imposes them - Correct the gettxout RPC handler to return the best chain hash as opposed the hash the txout was found in - Optimize various RPC handlers: - Change several of the RPC handlers to use the new chain snapshot capability to avoid needlessly loading data - Update several handlers to use new functionality to avoid accessing the block manager so they are able to return the data without blocking when the server is busy processing blocks - Update non-verbose getblock to avoid deserialization and serialization overhead - Update getblockheader to request the block height directly from chain and only load the header - Update getdifficulty to use the new cached data from chain - Update getmininginfo to use the new cached data from chain - Update non-verbose getrawtransaction to avoid deserialization and serialization overhead - Update gettxout to use the new utxo store versus loading full transactions using the transaction index The following is an overview of the utility changes: - Update addblock to use the new database and chain interfaces - Update findcheckpoint to use the new database and chain interfaces - Remove the dropafter utility which is no longer supported NOTE: The transaction index and address index will be reimplemented in another commit.
2015-08-26 06:03:18 +02:00
// AssertError identifies an error that indicates an internal code consistency
// issue and should be treated as a critical and unrecoverable error.
type AssertError string
// Error returns the assertion error as a human-readable string and satisfies
blockchain: Rework to use new db interface. This commit is the first stage of several that are planned to convert the blockchain package into a concurrent safe package that will ultimately allow support for multi-peer download and concurrent chain processing. The goal is to update btcd proper after each step so it can take advantage of the enhancements as they are developed. In addition to the aforementioned benefit, this staged approach has been chosen since it is absolutely critical to maintain consensus. Separating the changes into several stages makes it easier for reviewers to logically follow what is happening and therefore helps prevent consensus bugs. Naturally there are significant automated tests to help prevent consensus issues as well. The main focus of this stage is to convert the blockchain package to use the new database interface and implement the chain-related functionality which it no longer handles. It also aims to improve efficiency in various areas by making use of the new database and chain capabilities. The following is an overview of the chain changes: - Update to use the new database interface - Add chain-related functionality that the old database used to handle - Main chain structure and state - Transaction spend tracking - Implement a new pruned unspent transaction output (utxo) set - Provides efficient direct access to the unspent transaction outputs - Uses a domain specific compression algorithm that understands the standard transaction scripts in order to significantly compress them - Removes reliance on the transaction index and paves the way toward eventually enabling block pruning - Modify the New function to accept a Config struct instead of inidividual parameters - Replace the old TxStore type with a new UtxoViewpoint type that makes use of the new pruned utxo set - Convert code to treat the new UtxoViewpoint as a rolling view that is used between connects and disconnects to improve efficiency - Make best chain state always set when the chain instance is created - Remove now unnecessary logic for dealing with unset best state - Make all exported functions concurrent safe - Currently using a single chain state lock as it provides a straight forward and easy to review path forward however this can be improved with more fine grained locking - Optimize various cases where full blocks were being loaded when only the header is needed to help reduce the I/O load - Add the ability for callers to get a snapshot of the current best chain stats in a concurrent safe fashion - Does not block callers while new blocks are being processed - Make error messages that reference transaction outputs consistently use <transaction hash>:<output index> - Introduce a new AssertError type an convert internal consistency checks to use it - Update tests and examples to reflect the changes - Add a full suite of tests to ensure correct functionality of the new code The following is an overview of the btcd changes: - Update to use the new database and chain interfaces - Temporarily remove all code related to the transaction index - Temporarily remove all code related to the address index - Convert all code that uses transaction stores to use the new utxo view - Rework several calls that required the block manager for safe concurrency to use the chain package directly now that it is concurrent safe - Change all calls to obtain the best hash to use the new best state snapshot capability from the chain package - Remove workaround for limits on fetching height ranges since the new database interface no longer imposes them - Correct the gettxout RPC handler to return the best chain hash as opposed the hash the txout was found in - Optimize various RPC handlers: - Change several of the RPC handlers to use the new chain snapshot capability to avoid needlessly loading data - Update several handlers to use new functionality to avoid accessing the block manager so they are able to return the data without blocking when the server is busy processing blocks - Update non-verbose getblock to avoid deserialization and serialization overhead - Update getblockheader to request the block height directly from chain and only load the header - Update getdifficulty to use the new cached data from chain - Update getmininginfo to use the new cached data from chain - Update non-verbose getrawtransaction to avoid deserialization and serialization overhead - Update gettxout to use the new utxo store versus loading full transactions using the transaction index The following is an overview of the utility changes: - Update addblock to use the new database and chain interfaces - Update findcheckpoint to use the new database and chain interfaces - Remove the dropafter utility which is no longer supported NOTE: The transaction index and address index will be reimplemented in another commit.
2015-08-26 06:03:18 +02:00
// the error interface.
func (e AssertError) Error() string {
return "assertion failed: " + string(e)
}
// ErrorCode identifies a kind of error.
type ErrorCode int
// These constants are used to identify a specific RuleError.
const (
// ErrDuplicateBlock indicates a block with the same hash already
// exists.
ErrDuplicateBlock ErrorCode = iota
// ErrBlockTooBig indicates the serialized block size exceeds the
// maximum allowed size.
ErrBlockTooBig
// ErrBlockVersionTooOld indicates the block version is too old and is
// no longer accepted since the majority of the network has upgraded
// to a newer version.
ErrBlockVersionTooOld
// ErrInvalidTime indicates the time in the passed block has a precision
// that is more than one second. The chain consensus rules require
// timestamps to have a maximum precision of one second.
ErrInvalidTime
// ErrTimeTooOld indicates the time is either before the median time of
// the last several blocks per the chain consensus rules or prior to the
// most recent checkpoint.
ErrTimeTooOld
// ErrTimeTooNew indicates the time is too far in the future as compared
// the current time.
ErrTimeTooNew
// ErrDifficultyTooLow indicates the difficulty for the block is lower
// than the difficulty required by the most recent checkpoint.
ErrDifficultyTooLow
// ErrUnexpectedDifficulty indicates specified bits do not align with
// the expected value either because it doesn't match the calculated
// valued based on difficulty regarted rules or it is out of the valid
// range.
ErrUnexpectedDifficulty
// ErrHighHash indicates the block does not hash to a value which is
// lower than the required target difficultly.
ErrHighHash
// ErrBadMerkleRoot indicates the calculated merkle root does not match
// the expected value.
ErrBadMerkleRoot
// ErrBadCheckpoint indicates a block that is expected to be at a
// checkpoint height does not match the expected one.
ErrBadCheckpoint
// ErrForkTooOld indicates a block is attempting to fork the block chain
// before the most recent checkpoint.
ErrForkTooOld
// ErrCheckpointTimeTooOld indicates a block has a timestamp before the
// most recent checkpoint.
ErrCheckpointTimeTooOld
// ErrNoTransactions indicates the block does not have a least one
// transaction. A valid block must have at least the coinbase
// transaction.
ErrNoTransactions
// ErrTooManyTransactions indicates the block has more transactions than
// are allowed.
ErrTooManyTransactions
// ErrNoTxInputs indicates a transaction does not have any inputs. A
// valid transaction must have at least one input.
ErrNoTxInputs
// ErrNoTxOutputs indicates a transaction does not have any outputs. A
// valid transaction must have at least one output.
ErrNoTxOutputs
// ErrTxTooBig indicates a transaction exceeds the maximum allowed size
// when serialized.
ErrTxTooBig
// ErrBadTxOutValue indicates an output value for a transaction is
// invalid in some way such as being out of range.
ErrBadTxOutValue
// ErrDuplicateTxInputs indicates a transaction references the same
// input more than once.
ErrDuplicateTxInputs
// ErrBadTxInput indicates a transaction input is invalid in some way
// such as referencing a previous transaction outpoint which is out of
// range or not referencing one at all.
ErrBadTxInput
// ErrMissingTx indicates a transaction referenced by an input is
// missing.
ErrMissingTx
// ErrUnfinalizedTx indicates a transaction has not been finalized.
// A valid block may only contain finalized transactions.
ErrUnfinalizedTx
// ErrDuplicateTx indicates a block contains an identical transaction
// (or at least two transactions which hash to the same value). A
// valid block may only contain unique transactions.
ErrDuplicateTx
// ErrOverwriteTx indicates a block contains a transaction that has
// the same hash as a previous transaction which has not been fully
// spent.
ErrOverwriteTx
// ErrImmatureSpend indicates a transaction is attempting to spend a
// coinbase that has not yet reached the required maturity.
ErrImmatureSpend
// ErrDoubleSpend indicates a transaction is attempting to spend coins
// that have already been spent.
ErrDoubleSpend
// ErrSpendTooHigh indicates a transaction is attempting to spend more
// value than the sum of all of its inputs.
ErrSpendTooHigh
// ErrBadFees indicates the total fees for a block are invalid due to
// exceeding the maximum possible value.
ErrBadFees
// ErrTooManySigOps indicates the total number of signature operations
// for a transaction or block exceed the maximum allowed limits.
ErrTooManySigOps
// ErrFirstTxNotCoinbase indicates the first transaction in a block
// is not a coinbase transaction.
ErrFirstTxNotCoinbase
// ErrMultipleCoinbases indicates a block contains more than one
// coinbase transaction.
ErrMultipleCoinbases
// ErrBadCoinbaseScriptLen indicates the length of the signature script
// for a coinbase transaction is not within the valid range.
ErrBadCoinbaseScriptLen
// ErrBadCoinbaseValue indicates the amount of a coinbase value does
// not match the expected value of the subsidy plus the sum of all fees.
ErrBadCoinbaseValue
// ErrMissingCoinbaseHeight indicates the coinbase transaction for a
// block does not start with the serialized block block height as
// required for version 2 and higher blocks.
ErrMissingCoinbaseHeight
// ErrBadCoinbaseHeight indicates the serialized block height in the
// coinbase transaction for version 2 and higher blocks does not match
// the expected value.
ErrBadCoinbaseHeight
// ErrScriptMalformed indicates a transaction script is malformed in
// some way. For example, it might be longer than the maximum allowed
// length or fail to parse.
ErrScriptMalformed
// ErrScriptValidation indicates the result of executing transaction
// script failed. The error covers any failure when executing scripts
// such signature verification failures and execution past the end of
// the stack.
ErrScriptValidation
)
// Map of ErrorCode values back to their constant names for pretty printing.
var errorCodeStrings = map[ErrorCode]string{
ErrDuplicateBlock: "ErrDuplicateBlock",
ErrBlockTooBig: "ErrBlockTooBig",
ErrBlockVersionTooOld: "ErrBlockVersionTooOld",
ErrInvalidTime: "ErrInvalidTime",
ErrTimeTooOld: "ErrTimeTooOld",
ErrTimeTooNew: "ErrTimeTooNew",
ErrDifficultyTooLow: "ErrDifficultyTooLow",
ErrUnexpectedDifficulty: "ErrUnexpectedDifficulty",
ErrHighHash: "ErrHighHash",
ErrBadMerkleRoot: "ErrBadMerkleRoot",
ErrBadCheckpoint: "ErrBadCheckpoint",
ErrForkTooOld: "ErrForkTooOld",
ErrCheckpointTimeTooOld: "ErrCheckpointTimeTooOld",
ErrNoTransactions: "ErrNoTransactions",
ErrTooManyTransactions: "ErrTooManyTransactions",
ErrNoTxInputs: "ErrNoTxInputs",
ErrNoTxOutputs: "ErrNoTxOutputs",
ErrTxTooBig: "ErrTxTooBig",
ErrBadTxOutValue: "ErrBadTxOutValue",
ErrDuplicateTxInputs: "ErrDuplicateTxInputs",
ErrBadTxInput: "ErrBadTxInput",
ErrMissingTx: "ErrMissingTx",
ErrUnfinalizedTx: "ErrUnfinalizedTx",
ErrDuplicateTx: "ErrDuplicateTx",
ErrOverwriteTx: "ErrOverwriteTx",
ErrImmatureSpend: "ErrImmatureSpend",
ErrDoubleSpend: "ErrDoubleSpend",
ErrSpendTooHigh: "ErrSpendTooHigh",
ErrBadFees: "ErrBadFees",
ErrTooManySigOps: "ErrTooManySigOps",
ErrFirstTxNotCoinbase: "ErrFirstTxNotCoinbase",
ErrMultipleCoinbases: "ErrMultipleCoinbases",
ErrBadCoinbaseScriptLen: "ErrBadCoinbaseScriptLen",
ErrBadCoinbaseValue: "ErrBadCoinbaseValue",
ErrMissingCoinbaseHeight: "ErrMissingCoinbaseHeight",
ErrBadCoinbaseHeight: "ErrBadCoinbaseHeight",
ErrScriptMalformed: "ErrScriptMalformed",
ErrScriptValidation: "ErrScriptValidation",
}
// String returns the ErrorCode as a human-readable name.
func (e ErrorCode) String() string {
if s := errorCodeStrings[e]; s != "" {
return s
}
return fmt.Sprintf("Unknown ErrorCode (%d)", int(e))
}
// RuleError identifies a rule violation. It is used to indicate that
// processing of a block or transaction failed due to one of the many validation
// rules. The caller can use type assertions to determine if a failure was
// specifically due to a rule violation and access the ErrorCode field to
// ascertain the specific reason for the rule violation.
type RuleError struct {
ErrorCode ErrorCode // Describes the kind of error
Description string // Human readable description of the issue
}
// Error satisfies the error interface and prints human-readable errors.
func (e RuleError) Error() string {
return e.Description
}
// ruleError creates an RuleError given a set of arguments.
func ruleError(c ErrorCode, desc string) RuleError {
return RuleError{ErrorCode: c, Description: desc}
}