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channeldb: export pagination method

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We export some methods related to the pagination logic be the
kv store implemenation of the payment data will live in another
package.
This commit is contained in:
ziggie
2025-08-13 08:50:58 +02:00
parent 5f3055944a
commit 4bb21a7284
3 changed files with 8 additions and 8 deletions
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4
channeldb/invoices.go
View File

@@ -553,7 +553,7 @@ func (d *DB) QueryInvoices(_ context.Context, q invpkg.InvoiceQuery) (
// Create a paginator which reads from our add index bucket with // Create a paginator which reads from our add index bucket with
// the parameters provided by the invoice query. // the parameters provided by the invoice query.
paginator := newPaginator( paginator := NewPaginator(
invoiceAddIndex.ReadCursor(), q.Reversed, q.IndexOffset, invoiceAddIndex.ReadCursor(), q.Reversed, q.IndexOffset,
q.NumMaxInvoices, q.NumMaxInvoices,
) )
@@ -603,7 +603,7 @@ func (d *DB) QueryInvoices(_ context.Context, q invpkg.InvoiceQuery) (
// Query our paginator using accumulateInvoices to build up a // Query our paginator using accumulateInvoices to build up a
// set of invoices. // set of invoices.
if err := paginator.query(accumulateInvoices); err != nil { if err := paginator.Query(accumulateInvoices); err != nil {
return err return err
} }

8
channeldb/paginate.go
View File

@@ -16,9 +16,9 @@ type paginator struct {
totalItems uint64 totalItems uint64
} }
// newPaginator returns a struct which can be used to query an indexed bucket // NewPaginator returns a struct which can be used to query an indexed bucket
// in pages. // in pages.
func newPaginator(c kvdb.RCursor, reversed bool, func NewPaginator(c kvdb.RCursor, reversed bool,
indexOffset, totalItems uint64) paginator { indexOffset, totalItems uint64) paginator {
return paginator{ return paginator{
@@ -105,14 +105,14 @@ func (p paginator) cursorStart() ([]byte, []byte) {
return indexKey, indexValue return indexKey, indexValue
} }
// query gets the start point for our index offset and iterates through keys // Query gets the start point for our index offset and iterates through keys
// in our index until we reach the total number of items required for the query // in our index until we reach the total number of items required for the query
// or we run out of cursor values. This function takes a fetchAndAppend function // or we run out of cursor values. This function takes a fetchAndAppend function
// which is responsible for looking up the entry at that index, adding the entry // which is responsible for looking up the entry at that index, adding the entry
// to its set of return items (if desired) and return a boolean which indicates // to its set of return items (if desired) and return a boolean which indicates
// whether the item was added. This is required to allow the paginator to // whether the item was added. This is required to allow the paginator to
// determine when the response has the maximum number of required items. // determine when the response has the maximum number of required items.
func (p paginator) query(fetchAndAppend func(k, v []byte) (bool, error)) error { func (p paginator) Query(fetchAndAppend func(k, v []byte) (bool, error)) error {
indexKey, indexValue := p.cursorStart() indexKey, indexValue := p.cursorStart()
var totalItems int var totalItems int

4
channeldb/payments_kv_store.go
View File

@@ -1205,13 +1205,13 @@ func (p *KVPaymentsDB) QueryPayments(_ context.Context,
// Create a paginator which reads from our sequence index bucket // Create a paginator which reads from our sequence index bucket
// with the parameters provided by the payments query. // with the parameters provided by the payments query.
paginator := newPaginator( paginator := NewPaginator(
indexes.ReadCursor(), query.Reversed, query.IndexOffset, indexes.ReadCursor(), query.Reversed, query.IndexOffset,
query.MaxPayments, query.MaxPayments,
) )
// Run a paginated query, adding payments to our response. // Run a paginated query, adding payments to our response.
if err := paginator.query(accumulatePayments); err != nil { if err := paginator.Query(accumulatePayments); err != nil {
return err return err
} }