557 lines
23 KiB
Kotlin
557 lines
23 KiB
Kotlin
package cash.z.ecc.android.sdk
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import android.content.Context
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import cash.z.ecc.android.sdk.block.CompactBlockProcessor
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import cash.z.ecc.android.sdk.ext.ZcashSdk
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import cash.z.ecc.android.sdk.internal.Derivation
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import cash.z.ecc.android.sdk.internal.SaplingParamTool
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import cash.z.ecc.android.sdk.internal.db.DatabaseCoordinator
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import cash.z.ecc.android.sdk.model.Account
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import cash.z.ecc.android.sdk.model.BlockHeight
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import cash.z.ecc.android.sdk.model.PercentDecimal
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import cash.z.ecc.android.sdk.model.TransactionOverview
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import cash.z.ecc.android.sdk.model.TransactionRecipient
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import cash.z.ecc.android.sdk.model.UnifiedSpendingKey
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import cash.z.ecc.android.sdk.model.WalletBalance
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import cash.z.ecc.android.sdk.model.Zatoshi
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import cash.z.ecc.android.sdk.model.ZcashNetwork
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import cash.z.ecc.android.sdk.tool.CheckpointTool
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import cash.z.ecc.android.sdk.tool.DerivationTool
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import cash.z.ecc.android.sdk.type.AddressType
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import cash.z.ecc.android.sdk.type.ConsensusMatchType
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import co.electriccoin.lightwallet.client.model.LightWalletEndpoint
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import kotlinx.coroutines.flow.Flow
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import kotlinx.coroutines.flow.StateFlow
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import kotlinx.coroutines.runBlocking
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import java.io.Closeable
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@Suppress("TooManyFunctions")
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interface Synchronizer {
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// Status
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/**
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* The network to which this synchronizer is connected and from which it is processing blocks.
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*/
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val network: ZcashNetwork
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/**
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* A flow of values representing the [Status] of this Synchronizer. As the status changes, a new
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* value will be emitted by this flow.
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*/
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val status: Flow<Status>
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/**
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* A flow of progress values, typically corresponding to this Synchronizer downloading blocks.
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* Typically, any non-zero value below `PercentDecimal.ONE_HUNDRED_PERCENT` indicates that progress indicators can
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* be shown and a value of `PercentDecimal.ONE_HUNDRED_PERCENT` signals that progress is complete and any progress
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* indicators can be hidden.
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*/
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val progress: Flow<PercentDecimal>
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/**
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* A flow of processor details, updated every time blocks are processed to include the latest
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* block height, blocks downloaded and blocks scanned. Similar to the [progress] flow but with a
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* lot more detail.
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*/
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val processorInfo: Flow<CompactBlockProcessor.ProcessorInfo>
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/**
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* The latest height observed on the network, which does not necessarily correspond to the
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* latest downloaded height or scanned height. Although this is present in [processorInfo], it
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* is such a frequently used value that it is convenient to have the real-time value by itself.
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*/
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val networkHeight: StateFlow<BlockHeight?>
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/**
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* A stream of balance values for the orchard pool. Includes the available and total balance.
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*/
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val orchardBalances: StateFlow<WalletBalance?>
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/**
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* A stream of balance values for the sapling pool. Includes the available and total balance.
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*/
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val saplingBalances: StateFlow<WalletBalance?>
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/**
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* A stream of balance values for the transparent pool. Includes the available and total balance.
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*/
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val transparentBalances: StateFlow<WalletBalance?>
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/**
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* A flow of all the transactions that are on the blockchain.
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*/
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val transactions: Flow<List<TransactionOverview>>
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//
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// Latest Properties
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//
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/**
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* An in-memory reference to the latest height seen on the network.
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*/
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val latestHeight: BlockHeight?
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/**
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* An in-memory reference to the best known birthday height, which can change if the first
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* transaction has not yet occurred.
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*/
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val latestBirthdayHeight: BlockHeight?
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//
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// Operations
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//
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/**
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* Adds the next available account-level spend authority, given the current set of
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* [ZIP 316](https://zips.z.cash/zip-0316) account identifiers known, to the wallet
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* database.
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*
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* The caller should store the byte encoding of the returned spending key in a secure
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* fashion. This encoding **MUST NOT** be exposed to users. It is an internal encoding
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* that is inherently unstable, and only intended to be passed between the SDK and the
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* storage backend. The caller **MUST NOT** allow this encoding to be exported or
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* imported.
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*
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* If `seed` was imported from a backup and this method is being used to restore a
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* previous wallet state, you should use this method to add all of the desired
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* accounts before scanning the chain from the seed's birthday height.
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*
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* By convention, wallets should only allow a new account to be generated after funds
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* have been received by the currently-available account (in order to enable
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* automated account recovery).
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*
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* @param seed the wallet's seed phrase.
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*
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* @return the newly created ZIP 316 account identifier, along with the binary
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* encoding of the `UnifiedSpendingKey` for the newly created account.
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*/
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// This is not yet ready to be a public API
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// suspend fun createAccount(seed: ByteArray): UnifiedSpendingKey
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/**
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* Gets the current unified address for the given account.
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*
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* @param accountId the optional accountId whose address is of interest. By default, the first
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* account is used.
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*
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* @return the current unified address for the given account.
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*/
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suspend fun getUnifiedAddress(account: Account = Account.DEFAULT): String
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/**
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* Gets the legacy Sapling address corresponding to the current unified address for the given account.
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*
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* @param account the optional accountId whose address is of interest. By default, the first
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* account is used.
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*
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* @return a legacy Sapling address for the given account.
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*/
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suspend fun getSaplingAddress(account: Account = Account.DEFAULT): String
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/**
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* Gets the legacy transparent address corresponding to the current unified address for the given account.
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*
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* @param account the optional accountId whose address is of interest. By default, the first
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* account is used.
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*
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* @return a legacy transparent address for the given account.
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*/
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suspend fun getTransparentAddress(account: Account = Account.DEFAULT): String
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/**
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* Sends zatoshi.
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*
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* @param usk the unified spending key associated with the notes that will be spent.
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* @param zatoshi the amount of zatoshi to send.
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* @param toAddress the recipient's address.
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* @param memo the optional memo to include as part of the transaction.
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*
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* @return a flow of PendingTransaction objects representing changes to the state of the
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* transaction. Any time the state changes a new instance will be emitted by this flow. This is
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* useful for updating the UI without needing to poll. Of course, polling is always an option
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* for any wallet that wants to ignore this return value.
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*/
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suspend fun sendToAddress(
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usk: UnifiedSpendingKey,
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amount: Zatoshi,
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toAddress: String,
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memo: String = ""
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): Long
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suspend fun shieldFunds(
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usk: UnifiedSpendingKey,
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memo: String = ZcashSdk.DEFAULT_SHIELD_FUNDS_MEMO_PREFIX
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): Long
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/**
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* Returns true when the given address is a valid z-addr. Invalid addresses will throw an
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* exception. Valid z-addresses have these characteristics: //TODO copy info from related ZIP
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*
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* @param address the address to validate.
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*
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* @return true when the given address is a valid z-addr.
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*
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* @throws RuntimeException when the address is invalid.
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*/
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suspend fun isValidShieldedAddr(address: String): Boolean
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/**
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* Returns true when the given address is a valid t-addr. Invalid addresses will throw an
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* exception. Valid t-addresses have these characteristics: //TODO copy info from related ZIP
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*
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* @param address the address to validate.
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*
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* @return true when the given address is a valid t-addr.
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*
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* @throws RuntimeException when the address is invalid.
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*/
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suspend fun isValidTransparentAddr(address: String): Boolean
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/**
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* Returns true when the given address is a valid ZIP 316 unified address.
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*
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* This method is intended for type checking (e.g. form validation). Invalid
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* addresses will throw an exception.
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*
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* @param address the address to validate.
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*
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* @return true when the given address is a valid unified address.
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*
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* @throws RuntimeException when the address is invalid.
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*/
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suspend fun isValidUnifiedAddr(address: String): Boolean
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/**
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* Validate whether the server and this SDK share the same consensus branch. This is
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* particularly important to check around network updates so that any wallet that's connected to
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* an incompatible server can surface that information effectively. For the SDK, the consensus
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* branch is used when creating transactions as each one needs to target a specific branch. This
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* function compares the server's branch id to this SDK's and returns information that helps
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* determine whether they match.
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*
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* @return an instance of [ConsensusMatchType] that is essentially a wrapper for both branch ids
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* and provides helper functions for communicating detailed errors to the user.
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*/
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suspend fun validateConsensusBranch(): ConsensusMatchType
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/**
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* Validates the given address, returning information about why it is invalid. This is a
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* convenience method that combines the behavior of [isValidShieldedAddr],
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* [isValidTransparentAddr], and [isValidUnifiedAddr] into one call so that the developer
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* doesn't have to worry about handling the exceptions that they throw. Rather, exceptions
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* are converted to [AddressType.Invalid] which has a `reason` property describing why it is
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* invalid.
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*
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* @param address the address to validate.
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*
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* @return an instance of [AddressType] providing validation info regarding the given address.
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*/
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suspend fun validateAddress(address: String): AddressType
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/**
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* Download all UTXOs for the given account addresses and store any new ones in the database.
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*
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* @param account The Account, for which all addresses blocks will be downloaded.
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* @param since The BlockHeight, from which blocks will be downloaded.
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*
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* @return the number of utxos that were downloaded and added to the UTXO table.
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*/
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suspend fun refreshUtxos(
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account: Account = Account.DEFAULT,
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since: BlockHeight = network.saplingActivationHeight
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): Int?
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/**
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* Returns the balance that the wallet knows about. This should be called after [refreshUtxos].
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*/
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suspend fun getTransparentBalance(tAddr: String): WalletBalance
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suspend fun getNearestRewindHeight(height: BlockHeight): BlockHeight
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/**
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* Returns the safest height to which we can rewind, given a desire to rewind to the height
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* provided. Due to how witness incrementing works, a wallet cannot simply rewind to any
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* arbitrary height. This handles all that complexity yet remains flexible in the future as
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* improvements are made.
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*/
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suspend fun rewindToNearestHeight(height: BlockHeight, alsoClearBlockCache: Boolean = false)
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suspend fun quickRewind()
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/**
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* Returns a list of memos for a transaction.
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*/
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fun getMemos(transactionOverview: TransactionOverview): Flow<String>
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/**
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* Returns a list of recipients for a transaction.
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*/
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fun getRecipients(transactionOverview: TransactionOverview): Flow<TransactionRecipient>
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//
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// Error Handling
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//
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/**
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* Gets or sets a global error handler. This is a useful hook for handling unexpected critical
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* errors.
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*
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* @return true when the error has been handled and the Synchronizer should attempt to continue.
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* False when the error is unrecoverable and the Synchronizer should [stop].
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*/
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var onCriticalErrorHandler: ((Throwable?) -> Boolean)?
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/**
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* An error handler for exceptions during processing. For instance, a block might be missing or
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* a reorg may get mishandled or the database may get corrupted.
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*
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* @return true when the error has been handled and the processor should attempt to continue.
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* False when the error is unrecoverable and the processor should [stop].
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*/
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var onProcessorErrorHandler: ((Throwable?) -> Boolean)?
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/**
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* An error handler for exceptions while submitting transactions to lightwalletd. For instance,
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* a transaction may get rejected because it would be a double-spend or the user might lose
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* their cellphone signal.
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*
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* @return true when the error has been handled and the sender should attempt to resend. False
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* when the error is unrecoverable and the sender should [stop].
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*/
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var onSubmissionErrorHandler: ((Throwable?) -> Boolean)?
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/**
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* Callback for setup errors that occur prior to processing compact blocks. Can be used to
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* override any errors encountered during setup. When this listener is missing then all setup
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* errors will result in the synchronizer not starting. This is particularly useful for wallets
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* to receive a callback right before the SDK will reject a lightwalletd server because it
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* appears not to match.
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*
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* @return true when the setup error should be ignored and processing should be allowed to
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* start. Otherwise, processing will not begin.
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*/
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var onSetupErrorHandler: ((Throwable?) -> Boolean)?
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/**
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* A callback to invoke whenever a chain error is encountered. These occur whenever the
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* processor detects a missing or non-chain-sequential block (i.e. a reorg). At a minimum, it is
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* best to log these errors because they are the most common source of bugs and unexpected
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* behavior in wallets, due to the chain data mutating and wallets becoming out of sync.
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*/
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var onChainErrorHandler: ((BlockHeight, BlockHeight) -> Any)?
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/**
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* Represents the status of this Synchronizer, which is useful for communicating to the user.
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*/
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enum class Status {
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/**
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* Indicates that [stop] has been called on this Synchronizer and it will no longer be used.
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*/
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STOPPED,
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/**
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* Indicates that this Synchronizer is disconnected from its lightwalletd server.
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* When set, a UI element may want to turn red.
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*/
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DISCONNECTED,
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/**
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* Indicates that the Synchronizer is actively syncing new blocks. It starts with downloading
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* new blocks, then validating these blocks and scanning them at the end.
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*
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* In **Downloading** sub-phase the Synchronizer is actively downloading new blocks from the
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* server.
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*
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* In **Validating** sub-phase the Synchronizer is actively validating new blocks that were downloaded
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* from the server. Blocks need to be verified before they are scanned. This confirms that
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* each block is chain-sequential, thereby detecting missing blocks and reorgs.
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*
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* In **Scanning** sub-phase Synchronizer is actively decrypting new blocks that were downloaded
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* from the server.
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*/
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SYNCING,
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/**
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* Indicates that this Synchronizer is actively enhancing newly scanned blocks with
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* additional transaction details, fetched from the server.
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*/
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ENHANCING,
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/**
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* Indicates that this Synchronizer is fully up to date and ready for all wallet functions.
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* When set, a UI element may want to turn green. In this state, the balance can be trusted.
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*/
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SYNCED
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}
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companion object {
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/**
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* Primary method that SDK clients will use to construct a synchronizer.
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*
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* @param zcashNetwork the network to use.
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* @param alias A string used to segregate multiple wallets in the filesystem. This implies the string
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* should not contain characters unsuitable for the platform's filesystem. The default value is
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* generally used unless an SDK client needs to support multiple wallets.
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* @param lightWalletEndpoint Server endpoint. See [cash.z.ecc.android.sdk.model.defaultForNetwork]. If a
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* client wishes to change the server endpoint, the active synchronizer will need to be stopped and a new
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* instance created with a new value.
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* @param seed the wallet's seed phrase. This is required the first time a new wallet is set up. For
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* subsequent calls, seed is only needed if [InitializerException.SeedRequired] is thrown.
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* @param birthday Block height representing the "birthday" of the wallet. When creating a new wallet, see
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* [BlockHeight.ofLatestCheckpoint]. When restoring an existing wallet, use block height that was first used
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* to create the wallet. If that value is unknown, null is acceptable but will result in longer
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* sync times. After sync completes, the birthday can be determined from [Synchronizer.latestBirthdayHeight].
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* @throws InitializerException.SeedRequired Indicates clients need to call this method again, providing the
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* seed bytes.
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* @throws IllegalStateException If multiple instances of synchronizer with the same network+alias are
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* active at the same time. Call `close` to finish one synchronizer before starting another one with the same
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* network+alias.
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*/
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/*
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* If customized initialization is required (e.g. for dependency injection or testing), see
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* [DefaultSynchronizerFactory].
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*/
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@Suppress("LongParameterList", "LongMethod")
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suspend fun new(
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context: Context,
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zcashNetwork: ZcashNetwork,
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alias: String = ZcashSdk.DEFAULT_ALIAS,
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lightWalletEndpoint: LightWalletEndpoint,
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seed: ByteArray?,
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birthday: BlockHeight?
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): CloseableSynchronizer {
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val applicationContext = context.applicationContext
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validateAlias(alias)
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val saplingParamTool = SaplingParamTool.new(applicationContext)
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val loadedCheckpoint = CheckpointTool.loadNearest(
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applicationContext,
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zcashNetwork,
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birthday ?: zcashNetwork.saplingActivationHeight
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)
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val coordinator = DatabaseCoordinator.getInstance(context)
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// The pending transaction database no longer exists, so we can delete the file
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coordinator.deletePendingTransactionDatabase(zcashNetwork, alias)
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val backend = DefaultSynchronizerFactory.defaultBackend(
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zcashNetwork,
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alias,
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saplingParamTool,
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coordinator
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)
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val blockStore =
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DefaultSynchronizerFactory
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.defaultCompactBlockRepository(coordinator.fsBlockDbRoot(zcashNetwork, alias), backend)
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val viewingKeys = seed?.let {
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DerivationTool.getInstance().deriveUnifiedFullViewingKeys(
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seed,
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zcashNetwork,
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Derivation.DEFAULT_NUMBER_OF_ACCOUNTS
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).toList()
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} ?: emptyList()
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val repository = DefaultSynchronizerFactory.defaultDerivedDataRepository(
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applicationContext,
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backend,
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coordinator.dataDbFile(zcashNetwork, alias),
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zcashNetwork,
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loadedCheckpoint,
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seed,
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viewingKeys
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)
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val service = DefaultSynchronizerFactory.defaultService(applicationContext, lightWalletEndpoint)
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val encoder = DefaultSynchronizerFactory.defaultEncoder(backend, saplingParamTool, repository)
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val downloader = DefaultSynchronizerFactory.defaultDownloader(service, blockStore)
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val txManager = DefaultSynchronizerFactory.defaultTxManager(
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encoder,
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service
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)
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val processor = DefaultSynchronizerFactory.defaultProcessor(
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backend,
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downloader,
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repository,
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birthday
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?: zcashNetwork.saplingActivationHeight
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)
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return SdkSynchronizer.new(
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zcashNetwork,
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alias,
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repository,
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txManager,
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processor,
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backend
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)
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}
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/**
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* Effectively the same as [new] although designed to be a blocking call with better
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* interoperability with Java clients.
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*
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* This is a blocking call, so it should not be called from the main thread.
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*/
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@JvmStatic
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@Suppress("LongParameterList")
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fun newBlocking(
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context: Context,
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zcashNetwork: ZcashNetwork,
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alias: String = ZcashSdk.DEFAULT_ALIAS,
|
|
lightWalletEndpoint: LightWalletEndpoint,
|
|
seed: ByteArray?,
|
|
birthday: BlockHeight?
|
|
): CloseableSynchronizer = runBlocking {
|
|
new(context, zcashNetwork, alias, lightWalletEndpoint, seed, birthday)
|
|
}
|
|
|
|
/**
|
|
* Delete the databases associated with this wallet. This removes all compact blocks and
|
|
* data derived from those blocks. Although most data can be regenerated by setting up a new
|
|
* Synchronizer instance with the seed, there are two special cases where data is not retained:
|
|
* 1. Outputs created with a `null` OVK
|
|
* 2. The UA to which a transaction was sent (recovery from seed will only reveal the receiver, not the full UA)
|
|
*
|
|
* @param appContext the application context.
|
|
* @param network the network associated with the data to be erased.
|
|
* @param alias the alias used to create the local data.
|
|
*
|
|
* @return true when one of the associated files was found. False most likely indicates
|
|
* that the wrong alias was provided.
|
|
*/
|
|
suspend fun erase(
|
|
appContext: Context,
|
|
network: ZcashNetwork,
|
|
alias: String = ZcashSdk.DEFAULT_ALIAS
|
|
): Boolean = SdkSynchronizer.erase(appContext, network, alias)
|
|
}
|
|
}
|
|
|
|
interface CloseableSynchronizer : Synchronizer, Closeable
|
|
|
|
/**
|
|
* Validate that the alias doesn't contain malicious characters by enforcing simple rules which
|
|
* permit the alias to be used as part of a file name for the preferences and databases. This
|
|
* enables multiple wallets to exist on one device, which is also helpful for sweeping funds.
|
|
*
|
|
* @param alias the alias to validate.
|
|
*
|
|
* @throws IllegalArgumentException whenever the alias is not less than 100 characters or
|
|
* contains something other than alphanumeric characters. Underscores and hyphens are allowed.
|
|
*/
|
|
private fun validateAlias(alias: String) {
|
|
require(
|
|
alias.length in ZcashSdk.ALIAS_MIN_LENGTH..ZcashSdk.ALIAS_MAX_LENGTH &&
|
|
alias.all { it.isLetterOrDigit() || it == '_' || it == '-' }
|
|
) {
|
|
"ERROR: Invalid alias ($alias). For security, the alias must be shorter than 100 " +
|
|
"characters and only contain letters, digits, hyphens, and underscores."
|
|
}
|
|
}
|