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 Go to latest Published: Nov 6, 2020 License: MIT Imports: 30 Imported by: 8

README

Proto

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Subsystems

Contracts

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SafeContract

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ContractSet

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Downloader

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Editor

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FileSection

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FormContract

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Merkle Roots

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Negotiate

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Reference Counter Subsystem

Key Files

The reference counter is a ledger that accompanies the contract and keeps track of the number of references to each sector. The number of references starts at one and increases as the user creates new backups of this contract. It decreases as the user deletes backups or deletes the siafile itself. Once the counter reaches zero, there is no way for the user to use the data stored in the sector. At this moment the sector can be reused by storing new data in it or it can be dropped when renewing the contract, so the user doesn't pay for it anymore.

The Reference Counter

The reference counter struct exposes a simple API aimed at manipulating the counters that it holds. One of the few complexities that might not be immediately obvious is that before performing any mutating operation, the caller need to start an update session by invoking callStartUpdate. This update session will use the WAL in order to ensure that all operations are ACID. After finishing a given set of mutations, the caller needs to invoke callCreateAndApplyTransaction in order for the updates to be written to disk. Before being written to disk, the updates are only reflected in a set of in-memory data structures. This ensures that any operation with the reference counter between the creation and application of the update will work with the updated data. In order to finish an update the caller needs to invoke callUpdateApplied in order to close the update session.

Each reference counter is created and deleted together with a contract, and this contract is responsible for its proper maintenance. The counts should be updated on backup creation/deletion and on file deletion.

Inbound Complexities
  • callCount can be used to fetch the value of a given counter
  • callStartUpdate can be used to start a new series of ACID updates
  • callAppend and callDropSectors can be used to add and remove sectors as they are added or removed to/from the contract
    • contract.makeUpdateRefCounterAppend uses callAppend to reflect the upload of new sectors to the contract
  • callSwap can be used to swap the positions of two counters in the file
  • callIncrement, callDecrement, and callSetCount can be used to adjust the value of a given counter
  • callCreateAndApplyTransaction is used to apply a set of updates to the file on disk
  • callUpdateApplied finished an update session
    • contract.managedCommitAppend and contract.managedCommitTxns use callCreateAndApplyTransaction (via the contract.applyRefCounterUpdate method) and callUpdateApplied in order to persist the changes they made to disk
  • callDeleteRefCounter removes the entire reference counter file from disk
Outbound Complexities
  • callCreateAndApplyTransaction will use writeaheadlog.WAL.NewTransaction in order to start a new WAL transaction. It will then use this transaction to apply the given updates and then it will close it.
Renew

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Seeds

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Session

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Documentation

Index

Constants

View Source 
const (
	// FCSignedIdentiferSize is the size of a ContractSignedIdentifier
	FCSignedIdentiferSize = 80 // 32 bytes identifier, 32 bytes signature, 16 bytes prefix
)

Variables

View Source 
var (
	// ErrInvalidHeaderData is returned when we try to deserialize the header from
	// a []byte with incorrect data
	ErrInvalidHeaderData = errors.New("invalid header data")

	// ErrInvalidSectorNumber is returned when the requested sector doesnt' exist
	ErrInvalidSectorNumber = errors.New("invalid sector given - it does not exist")

	// ErrInvalidVersion is returned when the version of the file we are trying to
	// read does not match the current refCounterHeaderSize
	ErrInvalidVersion = errors.New("invalid file version")

	// ErrInvalidUpdateInstruction is returned when trying to parse a WAL update
	// instruction that is too short to possibly contain all the required data.
	ErrInvalidUpdateInstruction = errors.New("instructions slice is too short to contain the required data")

	// ErrRefCounterNotExist is returned when there is no refcounter file with
	// the given path
	ErrRefCounterNotExist = errors.New("refcounter does not exist")

	// ErrUpdateWithoutUpdateSession is returned when an update operation is
	// called without an open update session
	ErrUpdateWithoutUpdateSession = errors.New("an update operation was called without an open update session")

	// ErrUpdateAfterDelete is returned when an update operation is attempted to
	// be created after a delete
	ErrUpdateAfterDelete = errors.New("updates cannot be created after a deletion")
)
View Source 
var (
	// ErrBadHostVersion indicates that the host is using an older, incompatible
	// version of the renter-host protocol.
	ErrBadHostVersion = errors.New("Bad host version; host does not support required protocols")
)
View Source 
var ErrCSIDoesNotMatchSeed = errors.New("ContractSignedIdentifier signature bytes not equal")

ErrCSIDoesNotMatchSeed is returned when a ContractSignedIdentifier was not created with the current seed used by the renter.

Functions

func GenerateKeyPair added in v1.4.0 

func GenerateKeyPair(renterSeed EphemeralRenterSeed, txn types.Transaction) (sk crypto.SecretKey, pk crypto.PublicKey)

GenerateKeyPair generates a secret and a public key for a contract to be used in its unlock conditions.

func GenerateKeyPairWithOutputID added in v1.4.0 

func GenerateKeyPairWithOutputID(renterSeed EphemeralRenterSeed, inputParentID types.SiacoinOutputID) (sk crypto.SecretKey, pk crypto.PublicKey)

GenerateKeyPairWithOutputID generates a secret and a public key for a contract to be used in its unlock conditions.

func IsRevisionMismatch 

func IsRevisionMismatch(err error) bool

IsRevisionMismatch returns true if err was caused by the host reporting a different revision number than expected.

Types

type ContractParams 

type ContractParams struct {
	Allowance     modules.Allowance
	Host          modules.HostDBEntry
	Funding       types.Currency
	StartHeight   types.BlockHeight
	EndHeight     types.BlockHeight
	RefundAddress types.UnlockHash
	RenterSeed    EphemeralRenterSeed
}

ContractParams are supplied as an argument to FormContract.

type ContractSet added in v1.3.1 

type ContractSet struct {
	// contains filtered or unexported fields
}

A ContractSet provides safe concurrent access to a set of contracts. Its purpose is to serialize modifications to individual contracts, as well as to provide operations on the set as a whole.

func NewContractSet added in v1.3.1 

func NewContractSet(dir string, rl *ratelimit.RateLimit, deps modules.Dependencies) (*ContractSet, error)

NewContractSet returns a ContractSet storing its contracts in the specified dir.

func (*ContractSet) Acquire added in v1.3.1 

func (cs *ContractSet) Acquire(id types.FileContractID) (*SafeContract, bool)

Acquire looks up the contract for the specified host key and locks it before returning it. If the contract is not present in the set, Acquire returns false and a zero-valued RenterContract.

func (*ContractSet) Close added in v1.3.1 

func (cs *ContractSet) Close() error

Close closes all contracts in a contract set, this means rendering it unusable for I/O

func (*ContractSet) ConvertV130Contract added in v1.3.1 

func (cs *ContractSet) ConvertV130Contract(c V130Contract, cr V130CachedRevision) error

ConvertV130Contract creates a contract file for a v130 contract.

func (*ContractSet) Delete added in v1.3.1 

func (cs *ContractSet) Delete(c *SafeContract)

Delete removes a contract from the set. The contract must have been previously acquired by Acquire. If the contract is not present in the set, Delete is a no-op.

func (*ContractSet) FormContract added in v1.3.1 

func (cs *ContractSet) FormContract(params ContractParams, txnBuilder transactionBuilder, tpool transactionPool, hdb hostDB, cancel <-chan struct{}) (rc modules.RenterContract, formationTxnSet []types.Transaction, sweepTxn types.Transaction, sweepParents []types.Transaction, err error)

FormContract forms a contract with a host and submits the contract transaction to tpool. The contract is added to the ContractSet and its metadata is returned.

func (*ContractSet) IDs added in v1.3.1 

func (cs *ContractSet) IDs() []types.FileContractID

IDs returns the fcid of each contract with in the set. The contracts are not locked.

func (*ContractSet) InsertContract added in v1.4.0 

func (cs *ContractSet) InsertContract(rc modules.RecoverableContract, revTxn types.Transaction, roots []crypto.Hash, sk crypto.SecretKey) (modules.RenterContract, error)

InsertContract inserts an existing contract into the set.

func (*ContractSet) Len added in v1.3.1 

func (cs *ContractSet) Len() int

Len returns the number of contracts in the set.

func (*ContractSet) NewDownloader added in v1.3.1 

func (cs *ContractSet) NewDownloader(host modules.HostDBEntry, id types.FileContractID, currentHeight types.BlockHeight, hdb hostDB, cancel <-chan struct{}) (_ *Downloader, err error)

NewDownloader initiates the download request loop with a host, and returns a Downloader.

func (*ContractSet) NewEditor added in v1.3.1 

func (cs *ContractSet) NewEditor(host modules.HostDBEntry, id types.FileContractID, currentHeight types.BlockHeight, hdb hostDB, cancel <-chan struct{}) (_ *Editor, err error)

NewEditor initiates the contract revision process with a host, and returns an Editor.

func (*ContractSet) NewRawSession added in v1.4.0 

func (cs *ContractSet) NewRawSession(host modules.HostDBEntry, currentHeight types.BlockHeight, hdb hostDB, cancel <-chan struct{}) (_ *Session, err error)

NewRawSession creates a new session unassociated with any contract.

func (*ContractSet) NewSession added in v1.4.0 

func (cs *ContractSet) NewSession(host modules.HostDBEntry, id types.FileContractID, currentHeight types.BlockHeight, hdb hostDB, logger *log.Logger, cancel <-chan struct{}) (_ *Session, err error)

NewSession initiates the RPC loop with a host and returns a Session.

func (*ContractSet) PublicKey added in v1.5.0 

func (cs *ContractSet) PublicKey(id types.FileContractID) (crypto.PublicKey, bool)

PublicKey returns the public key capable of verifying the renter's signature on a contract.

func (*ContractSet) Renew added in v1.3.1 

func (cs *ContractSet) Renew(oldContract *SafeContract, params ContractParams, txnBuilder transactionBuilder, tpool transactionPool, hdb hostDB, cancel <-chan struct{}) (rc modules.RenterContract, formationTxnSet []types.Transaction, err error)

Renew negotiates a new contract for data already stored with a host, and submits the new contract transaction to tpool. The new contract is added to the ContractSet and its metadata is returned.

func (*ContractSet) Return added in v1.3.1 

func (cs *ContractSet) Return(c *SafeContract)

Return returns a locked contract to the set and unlocks it. The contract must have been previously acquired by Acquire. If the contract is not present in the set, Return panics.

func (*ContractSet) View added in v1.3.1 

func (cs *ContractSet) View(id types.FileContractID) (modules.RenterContract, bool)

View returns a copy of the contract with the specified host key. The contracts is not locked. Certain fields, including the MerkleRoots, are set to nil for safety reasons. If the contract is not present in the set, View returns false and a zero-valued RenterContract.

func (*ContractSet) ViewAll added in v1.3.1 

func (cs *ContractSet) ViewAll() []modules.RenterContract

ViewAll returns the metadata of each contract in the set. The contracts are not locked.

type ContractSignedIdentifier added in v1.4.0 

type ContractSignedIdentifier [FCSignedIdentiferSize]byte

ContractSignedIdentifier is an identifier with a prefix and appended signature, ready to be stored in the arbitrary data section of a transaction.

func PrefixedSignedIdentifier added in v1.4.0 

func PrefixedSignedIdentifier(renterSeed EphemeralRenterSeed, txn types.Transaction, hostKey types.SiaPublicKey) (ContractSignedIdentifier, crypto.Ciphertext)

PrefixedSignedIdentifier is a helper function that creates a prefixed and signed identifier using a renter key and the first siacoin input of a transaction. NOTE: Always use PrefixedSignedIdentifier when creating identifiers for filecontracts. It wipes all the secrets required for creating the identifier from memory safely.

func (ContractSignedIdentifier) IsValid added in v1.4.0 

func (csi ContractSignedIdentifier) IsValid(renterSeed EphemeralRenterSeed, txn types.Transaction, hostKey crypto.Ciphertext) (types.SiaPublicKey, bool, error)

IsValid checks the signature against a seed and contract to determine if it was created using the specified seed.

type Downloader 

type Downloader struct {
	// contains filtered or unexported fields
}

A Downloader retrieves sectors by calling the download RPC on a host. Downloaders are NOT thread- safe; calls to Sector must be serialized.

func (*Downloader) Close 

func (hd *Downloader) Close() error

Close cleanly terminates the download loop with the host and closes the connection.

func (*Downloader) Download added in v1.4.0 

func (hd *Downloader) Download(root crypto.Hash, offset, length uint32) (_ modules.RenterContract, _ []byte, err error)

Download retrieves the requested sector data and revises the underlying contract to pay the host proportionally to the data retrieved.

type Editor 

type Editor struct {
	// contains filtered or unexported fields
}

A Editor modifies a Contract by calling the revise RPC on a host. It Editors are NOT thread-safe; calls to Upload must happen in serial.

func (*Editor) Close 

func (he *Editor) Close() error

Close cleanly terminates the revision loop with the host and closes the connection.

func (*Editor) HostSettings added in v1.4.2 

func (he *Editor) HostSettings() modules.HostExternalSettings

HostSettings returns the settings that are active in the current session.

func (*Editor) Upload 

func (he *Editor) Upload(data []byte) (_ modules.RenterContract, _ crypto.Hash, err error)

Upload negotiates a revision that adds a sector to a file contract.

type EphemeralRenterSeed added in v1.4.0 

type EphemeralRenterSeed RenterSeed

EphemeralRenterSeed is a renter seed derived from the master renter seed. The master seed should never be used directly.

type MerkleRootSet added in v1.3.1 

type MerkleRootSet []crypto.Hash

MerkleRootSet is a set of Merkle roots, and gets encoded more efficiently.

func (MerkleRootSet) MarshalJSON added in v1.3.1 

func (mrs MerkleRootSet) MarshalJSON() ([]byte, error)

MarshalJSON defines a JSON encoding for a MerkleRootSet.

func (*MerkleRootSet) UnmarshalJSON added in v1.3.1 

func (mrs *MerkleRootSet) UnmarshalJSON(b []byte) error

UnmarshalJSON attempts to decode a MerkleRootSet, falling back on the legacy decoding of a []crypto.Hash if that fails.

type RenterSeed added in v1.4.0 

type RenterSeed modules.Seed

RenterSeed is the master seed of the renter which is used to derive other seeds.

func DeriveRenterSeed added in v1.4.0 

func DeriveRenterSeed(walletSeed modules.Seed) RenterSeed

DeriveRenterSeed creates a renterSeed for creating file contracts. NOTE: The seed returned by this function should be wiped once it's no longer in use.

func (RenterSeed) EphemeralRenterSeed added in v1.4.0 

func (rs RenterSeed) EphemeralRenterSeed(windowStart types.BlockHeight) EphemeralRenterSeed

EphemeralRenterSeed creates a renterSeed for creating file contracts. NOTE: The seed returned by this function should be wiped once it's no longer in use.

type SafeContract added in v1.3.1 

type SafeContract struct {
	// contains filtered or unexported fields
}

A SafeContract contains the most recent revision transaction negotiated with a host, and the secret key used to sign it.

func (*SafeContract) CommitPaymentIntent added in v1.4.8 

func (c *SafeContract) CommitPaymentIntent(t *unappliedWalTxn, signedTxn types.Transaction, amount types.Currency, rpc types.Specifier) error

CommitPaymentIntent will commit the intent to pay a host for an rpc by committing the signed txn in the contract's header.

func (*SafeContract) LastRevision added in v1.4.8 

func (c *SafeContract) LastRevision() types.FileContractRevision

LastRevision returns the most recent revision

func (*SafeContract) Metadata added in v1.3.1 

func (c *SafeContract) Metadata() modules.RenterContract

Metadata returns the metadata of a renter contract

func (*SafeContract) PublicKey added in v1.5.0 

func (c *SafeContract) PublicKey() crypto.PublicKey

PublicKey returns the public key capable of verifying the renter's signature on a contract.

func (*SafeContract) RecordPaymentIntent added in v1.4.8 

func (c *SafeContract) RecordPaymentIntent(rev types.FileContractRevision, amount types.Currency, rpc types.Specifier) (*unappliedWalTxn, error)

RecordPaymentIntent will records the changes we are about to make to the revision in order to pay a host for an RPC.

func (*SafeContract) Sign added in v1.4.8 

func (c *SafeContract) Sign(hash crypto.Hash) crypto.Signature

Sign will sign the given hash using the safecontract's secret key

func (*SafeContract) UpdateUtility added in v1.3.3 

func (c *SafeContract) UpdateUtility(utility modules.ContractUtility) error

UpdateUtility updates the utility field of a contract.

func (*SafeContract) Utility added in v1.3.3 

func (c *SafeContract) Utility() modules.ContractUtility

Utility returns the contract utility for the contract.

type Session added in v1.4.0 

type Session struct {
	// contains filtered or unexported fields
}

A Session is an ongoing exchange of RPCs via the renter-host protocol.

TODO: The session type needs access to a logger. Probably the renter logger.

func (*Session) Append added in v1.4.0 

func (s *Session) Append(data []byte) (_ modules.RenterContract, _ crypto.Hash, err error)

Append calls the Write RPC with a single Append action, returning the updated contract and the Merkle root of the appended sector.

func (*Session) Close added in v1.4.0 

func (s *Session) Close() error

Close cleanly terminates the protocol session with the host and closes the connection.

func (*Session) HostSettings added in v1.4.2 

func (s *Session) HostSettings() modules.HostExternalSettings

HostSettings returns the currently active host settings of the session.

func (*Session) Lock added in v1.4.0 

func (s *Session) Lock(id types.FileContractID, secretKey crypto.SecretKey) (types.FileContractRevision, []types.TransactionSignature, error)

Lock calls the Lock RPC, locking the supplied contract and returning its most recent revision.

func (*Session) Read added in v1.4.0 

func (s *Session) Read(w io.Writer, req modules.LoopReadRequest, cancel <-chan struct{}) (_ modules.RenterContract, err error)

Read calls the Read RPC, writing the requested data to w. The RPC can be cancelled (with a granularity of one section) via the cancel channel.

func (*Session) ReadSection added in v1.4.0 

func (s *Session) ReadSection(root crypto.Hash, offset, length uint32) (_ modules.RenterContract, _ []byte, err error)

ReadSection calls the Read RPC with a single section and returns the requested data. A Merkle proof is always requested.

func (*Session) RecoverSectorRoots added in v1.4.0 

func (s *Session) RecoverSectorRoots(lastRev types.FileContractRevision, sk crypto.SecretKey) (_ types.Transaction, _ []crypto.Hash, err error)

RecoverSectorRoots calls the contract roots download RPC and returns the requested sector roots. The Revision and Signature fields of req are filled in automatically. If a Merkle proof is requested, it is verified.

func (*Session) Replace added in v1.4.1 

func (s *Session) Replace(data []byte, sectorIndex uint64, trim bool) (_ modules.RenterContract, _ crypto.Hash, err error)

Replace calls the Write RPC with a series of actions that replace the sector at the specified index with data, returning the updated contract and the Merkle root of the new sector.

func (*Session) SectorRoots added in v1.4.0 

func (s *Session) SectorRoots(req modules.LoopSectorRootsRequest) (_ modules.RenterContract, _ []crypto.Hash, err error)

SectorRoots calls the contract roots download RPC and returns the requested sector roots. The Revision and Signature fields of req are filled in automatically. If a Merkle proof is requested, it is verified.

func (*Session) Settings added in v1.4.0 

func (s *Session) Settings() (modules.HostExternalSettings, error)

Settings calls the Settings RPC, returning the host's reported settings.

func (*Session) Unlock added in v1.4.0 

func (s *Session) Unlock() error

Unlock calls the Unlock RPC, unlocking the currently-locked contract.

func (*Session) Write added in v1.4.0 

func (s *Session) Write(actions []modules.LoopWriteAction) (_ modules.RenterContract, err error)

Write implements the Write RPC, except for ActionUpdate. A Merkle proof is always requested.

type V130CachedRevision added in v1.3.1 

type V130CachedRevision struct {
	Revision    types.FileContractRevision `json:"revision"`
	MerkleRoots modules.MerkleRootSet      `json:"merkleroots"`
}

A V130CachedRevision contains changes that would be applied to a RenterContract if a contract revision succeeded.

type V130Contract added in v1.3.1 

type V130Contract struct {
	HostPublicKey    types.SiaPublicKey         `json:"hostpublickey"`
	ID               types.FileContractID       `json:"id"`
	LastRevision     types.FileContractRevision `json:"lastrevision"`
	LastRevisionTxn  types.Transaction          `json:"lastrevisiontxn"`
	MerkleRoots      MerkleRootSet              `json:"merkleroots"`
	SecretKey        crypto.SecretKey           `json:"secretkey"`
	StartHeight      types.BlockHeight          `json:"startheight"`
	DownloadSpending types.Currency             `json:"downloadspending"`
	StorageSpending  types.Currency             `json:"storagespending"`
	UploadSpending   types.Currency             `json:"uploadspending"`
	TotalCost        types.Currency             `json:"totalcost"`
	ContractFee      types.Currency             `json:"contractfee"`
	TxnFee           types.Currency             `json:"txnfee"`
	SiafundFee       types.Currency             `json:"siafundfee"`
}

A V130Contract specifies the v130 contract format.

func (*V130Contract) EndHeight added in v1.3.1 

func (c *V130Contract) EndHeight() types.BlockHeight

EndHeight returns the height at which the host is no longer obligated to store contract data.

func (*V130Contract) RenterFunds added in v1.3.1 

func (c *V130Contract) RenterFunds() types.Currency

RenterFunds returns the funds remaining in the contract's Renter payout as of the most recent revision.

Source Files

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