multi: remove unused db code

As we've now switched over to using sqldb v2 for most of the db objects,
we can remove a lot of deprecated code that's no longer used in the litd
project. This commit removes that code.

Author: ViktorT-11

db/interfaces.go

@@ -1,311 +1,5 @@
 package db
 
-import (
-	"context"
-	"database/sql"
-	"math"
-	prand "math/rand"
-	"time"
-
-	"github.com/lightninglabs/lightning-terminal/db/sqlc"
-	"github.com/lightningnetwork/lnd/sqldb/v2"
-)
-
-var (
-	// DefaultStoreTimeout is the default timeout used for any interaction
-	// with the storage/database.
-	DefaultStoreTimeout = time.Second * 10
-)
-
-const (
-	// DefaultNumTxRetries is the default number of times we'll retry a
-	// transaction if it fails with an error that permits transaction
-	// repetition.
-	DefaultNumTxRetries = 10
-
-	// DefaultInitialRetryDelay is the default initial delay between
-	// retries. This will be used to generate a random delay between -50%
-	// and +50% of this value, so 20 to 60 milliseconds. The retry will be
-	// doubled after each attempt until we reach DefaultMaxRetryDelay. We
-	// start with a random value to avoid multiple goroutines that are
-	// created at the same time to effectively retry at the same time.
-	DefaultInitialRetryDelay = time.Millisecond * 40
-
-	// DefaultMaxRetryDelay is the default maximum delay between retries.
-	DefaultMaxRetryDelay = time.Second * 3
-)
-
-// TxOptions represents a set of options one can use to control what type of
-// database transaction is created. Transaction can wither be read or write.
-type TxOptions interface {
-	// ReadOnly returns true if the transaction should be read only.
-	ReadOnly() bool
-}
-
-// BatchedTx is a generic interface that represents the ability to execute
-// several operations to a given storage interface in a single atomic
-// transaction. Typically, Q here will be some subset of the main sqlc.Querier
-// interface allowing it to only depend on the routines it needs to implement
-// any additional business logic.
-type BatchedTx[Q any] interface {
-	// ExecTx will execute the passed txBody, operating upon generic
-	// parameter Q (usually a storage interface) in a single transaction.
-	// The set of TxOptions are passed in in order to allow the caller to
-	// specify if a transaction should be read-only and optionally what
-	// type of concurrency control should be used.
-	ExecTx(ctx context.Context, txOptions TxOptions,
-		txBody func(Q) error) error
-
-	// Backend returns the type of the database backend used.
-	Backend() sqldb.BackendType
-}
-
-// Tx represents a database transaction that can be committed or rolled back.
-type Tx interface {
-	// Commit commits the database transaction, an error should be returned
-	// if the commit isn't possible.
-	Commit() error
-
-	// Rollback rolls back an incomplete database transaction.
-	// Transactions that were able to be committed can still call this as a
-	// noop.
-	Rollback() error
-}
-
-// QueryCreator is a generic function that's used to create a Querier, which is
-// a type of interface that implements storage related methods from a database
-// transaction. This will be used to instantiate an object callers can use to
-// apply multiple modifications to an object interface in a single atomic
-// transaction.
-type QueryCreator[Q any] func(*sql.Tx) Q
-
-// BatchedQuerier is a generic interface that allows callers to create a new
-// database transaction based on an abstract type that implements the TxOptions
-// interface.
-type BatchedQuerier interface {
-	// Querier is the underlying query source, this is in place so we can
-	// pass a BatchedQuerier implementation directly into objects that
-	// create a batched version of the normal methods they need.
-	sqlc.Querier
-
-	// CustomQueries is the set of custom queries that we have manually
-	// defined in addition to the ones generated by sqlc.
-	sqlc.CustomQueries
-
-	// BeginTx creates a new database transaction given the set of
-	// transaction options.
-	BeginTx(ctx context.Context, options TxOptions) (*sql.Tx, error)
-}
-
-// txExecutorOptions is a struct that holds the options for the transaction
-// executor. This can be used to do things like retry a transaction due to an
-// error a certain amount of times.
-type txExecutorOptions struct {
-	numRetries        int
-	initialRetryDelay time.Duration
-	maxRetryDelay     time.Duration
-}
-
-// defaultTxExecutorOptions returns the default options for the transaction
-// executor.
-func defaultTxExecutorOptions() *txExecutorOptions {
-	return &txExecutorOptions{
-		numRetries:        DefaultNumTxRetries,
-		initialRetryDelay: DefaultInitialRetryDelay,
-		maxRetryDelay:     DefaultMaxRetryDelay,
-	}
-}
-
-// randRetryDelay returns a random retry delay between -50% and +50%
-// of the configured delay that is doubled for each attempt and capped at a max
-// value.
-func (t *txExecutorOptions) randRetryDelay(attempt int) time.Duration {
-	halfDelay := t.initialRetryDelay / 2
-	randDelay := prand.Int63n(int64(t.initialRetryDelay)) //nolint:gosec
-
-	// 50% plus 0%-100% gives us the range of 50%-150%.
-	initialDelay := halfDelay + time.Duration(randDelay)
-
-	// If this is the first attempt, we just return the initial delay.
-	if attempt == 0 {
-		return initialDelay
-	}
-
-	// For each subsequent delay, we double the initial delay. This still
-	// gives us a somewhat random delay, but it still increases with each
-	// attempt. If we double something n times, that's the same as
-	// multiplying the value with 2^n. We limit the power to 32 to avoid
-	// overflows.
-	factor := time.Duration(math.Pow(2, math.Min(float64(attempt), 32)))
-	actualDelay := initialDelay * factor
-
-	// Cap the delay at the maximum configured value.
-	if actualDelay > t.maxRetryDelay {
-		return t.maxRetryDelay
-	}
-
-	return actualDelay
-}
-
-// TxExecutorOption is a functional option that allows us to pass in optional
-// argument when creating the executor.
-type TxExecutorOption func(*txExecutorOptions)
-
-// WithTxRetries is a functional option that allows us to specify the number of
-// times a transaction should be retried if it fails with a repeatable error.
-func WithTxRetries(numRetries int) TxExecutorOption {
-	return func(o *txExecutorOptions) {
-		o.numRetries = numRetries
-	}
-}
-
-// WithTxRetryDelay is a functional option that allows us to specify the delay
-// to wait before a transaction is retried.
-func WithTxRetryDelay(delay time.Duration) TxExecutorOption {
-	return func(o *txExecutorOptions) {
-		o.initialRetryDelay = delay
-	}
-}
-
-// TransactionExecutor is a generic struct that abstracts away from the type of
-// query a type needs to run under a database transaction, and also the set of
-// options for that transaction. The QueryCreator is used to create a query
-// given a database transaction created by the BatchedQuerier.
-type TransactionExecutor[Query any] struct {
-	BatchedQuerier
-
-	createQuery QueryCreator[Query]
-
-	opts *txExecutorOptions
-}
-
-// NewTransactionExecutor creates a new instance of a TransactionExecutor given
-// a Querier query object and a concrete type for the type of transactions the
-// Querier understands.
-func NewTransactionExecutor[Querier any](db BatchedQuerier,
-	createQuery QueryCreator[Querier],
-	opts ...TxExecutorOption) *TransactionExecutor[Querier] {
-
-	txOpts := defaultTxExecutorOptions()
-	for _, optFunc := range opts {
-		optFunc(txOpts)
-	}
-
-	return &TransactionExecutor[Querier]{
-		BatchedQuerier: db,
-		createQuery:    createQuery,
-		opts:           txOpts,
-	}
-}
-
-// ExecTx is a wrapper for txBody to abstract the creation and commit of a db
-// transaction. The db transaction is embedded in a `*Queries` that txBody
-// needs to use when executing each one of the queries that need to be applied
-// atomically. This can be used by other storage interfaces to parameterize the
-// type of query and options run, in order to have access to batched operations
-// related to a storage object.
-func (t *TransactionExecutor[Q]) ExecTx(ctx context.Context,
-	txOptions TxOptions, txBody func(Q) error) error {
-
-	waitBeforeRetry := func(attemptNumber int) {
-		retryDelay := t.opts.randRetryDelay(attemptNumber)
-
-		log.Tracef("Retrying transaction due to tx serialization or "+
-			"deadlock error, attempt_number=%v, delay=%v",
-			attemptNumber, retryDelay)
-
-		// Before we try again, we'll wait with a random backoff based
-		// on the retry delay.
-		time.Sleep(retryDelay)
-	}
-
-	for i := 0; i < t.opts.numRetries; i++ {
-		// Create the db transaction.
-		tx, err := t.BatchedQuerier.BeginTx(ctx, txOptions)
-		if err != nil {
-			dbErr := MapSQLError(err)
-			if IsSerializationOrDeadlockError(dbErr) {
-				// Nothing to roll back here, since we didn't
-				// even get a transaction yet.
-				waitBeforeRetry(i)
-				continue
-			}
-
-			return dbErr
-		}
-
-		// Rollback is safe to call even if the tx is already closed,
-		// so if the tx commits successfully, this is a no-op.
-		defer func() {
-			_ = tx.Rollback()
-		}()
-
-		if err := txBody(t.createQuery(tx)); err != nil {
-			dbErr := MapSQLError(err)
-			if IsSerializationOrDeadlockError(dbErr) {
-				// Roll back the transaction, then pop back up
-				// to try once again.
-				_ = tx.Rollback()
-
-				waitBeforeRetry(i)
-				continue
-			}
-
-			return dbErr
-		}
-
-		// Commit transaction.
-		if err = tx.Commit(); err != nil {
-			dbErr := MapSQLError(err)
-			if IsSerializationOrDeadlockError(dbErr) {
-				// Roll back the transaction, then pop back up
-				// to try once again.
-				_ = tx.Rollback()
-
-				waitBeforeRetry(i)
-				continue
-			}
-
-			return dbErr
-		}
-
-		return nil
-	}
-
-	// If we get to this point, then we weren't able to successfully commit
-	// a tx given the max number of retries.
-	return ErrRetriesExceeded
-}
-
-// Backend returns the type of the database backend used.
-func (t *TransactionExecutor[Q]) Backend() sqldb.BackendType {
-	return t.BatchedQuerier.Backend()
-}
-
-// BaseDB is the base database struct that each implementation can embed to
-// gain some common functionality.
-type BaseDB struct {
-	*sql.DB
-
-	*sqlc.Queries
-}
-
-// BeginTx wraps the normal sql specific BeginTx method with the TxOptions
-// interface. This interface is then mapped to the concrete sql tx options
-// struct.
-func (s *BaseDB) BeginTx(ctx context.Context, opts TxOptions) (*sql.Tx, error) {
-	sqlOptions := sql.TxOptions{
-		ReadOnly:  opts.ReadOnly(),
-		Isolation: sql.LevelSerializable,
-	}
-	return s.DB.BeginTx(ctx, &sqlOptions)
-}
-
-// Backend returns the type of the database backend used.
-func (s *BaseDB) Backend() sqldb.BackendType {
-	return s.Queries.Backend()
-}
-
 // QueriesTxOptions defines the set of db txn options the SQLQueries
 // understands.
 type QueriesTxOptions struct {