add lexi kv interface type

dex/lexi/db_test.go

@@ -2,7 +2,6 @@ package lexi
 
 import (
 	"bytes"
-	"encoding"
 	"os"
 	"path/filepath"
 	"strings"
@@ -66,11 +65,11 @@ func (v *tValue) MarshalBinary() ([]byte, error) {
 	return v.v, nil
 }
 
-func valueIndex(k, v encoding.BinaryMarshaler) ([]byte, error) {
+func valueIndex(k, v KV) ([]byte, error) {
 	return v.(*tValue).idx, nil
 }
 
-func valueKey(k, v encoding.BinaryMarshaler) ([]byte, error) {
+func valueKey(k, v KV) ([]byte, error) {
 	return v.(*tValue).k, nil
 }
 
@@ -109,7 +108,7 @@ func TestIndex(t *testing.T) {
 		indexKey = append(prefix, indexKey...)
 		v := &tValue{k: indexKey, v: encode.RandomBytes(10), idx: []byte{byte(i)}}
 		vs[i] = v
-		if err := tbl.Set(B(k), v); err != nil {
+		if err := tbl.Set(k, v); err != nil {
 			t.Fatalf("Error setting table entry: %v", err)
 		}
 	}

dex/lexi/index.go

@@ -5,11 +5,8 @@ package lexi
 
 import (
 	"bytes"
-	"encoding"
-	"encoding/binary"
 	"errors"
 	"fmt"
-	"time"
 
 	"decred.org/dcrdex/dex"
 	"github.com/dgraph-io/badger"
@@ -29,13 +26,13 @@ type Index struct {
 	name                    string
 	table                   *Table
 	prefix                  keyPrefix
-	f                       func(k, v encoding.BinaryMarshaler) ([]byte, error)
+	f                       func(k, v KV) ([]byte, error)
 	defaultIterationOptions iteratorOpts
 }
 
 // AddIndex adds an index to a Table. Once an Index is added, every datum
 // Set in the Table will generate an entry in the Index too.
-func (t *Table) AddIndex(name string, f func(k, v encoding.BinaryMarshaler) ([]byte, error)) (*Index, error) {
+func (t *Table) AddIndex(name string, f func(k, v KV) ([]byte, error)) (*Index, error) {
 	p, err := t.prefixForName(t.name + "__idx__" + name)
 	if err != nil {
 		return nil, err
@@ -51,7 +48,7 @@ func (t *Table) AddIndex(name string, f func(k, v encoding.BinaryMarshaler) ([]b
 	return idx, nil
 }
 
-func (idx *Index) add(txn *badger.Txn, k, v encoding.BinaryMarshaler, dbID DBID) ([]byte, error) {
+func (idx *Index) add(txn *badger.Txn, k, v KV, dbID DBID) ([]byte, error) {
 	idxB, err := idx.f(k, v)
 	if err != nil {
 		return nil, fmt.Errorf("error getting index value: %w", err)
@@ -170,32 +167,10 @@ func (i *Iter) Delete() error {
 	return i.idx.table.deleteDatum(i.txn, i.dbID, d)
 }
 
-// IndexBucket is any one of a number of common types whose binary encoding is
-// straight-forward. An IndexBucket restricts Iterate to the entries in the
-// index that have the bytes decoded from the IndexBucket as the prefix.
-type IndexBucket interface{}
-
-func parseIndexBucket(i IndexBucket) (b []byte, err error) {
-	switch it := i.(type) {
-	case []byte:
-		b = it
-	case uint32:
-		b = make([]byte, 4)
-		binary.BigEndian.PutUint32(b[:], it)
-	case time.Time:
-		b = make([]byte, 8)
-		binary.BigEndian.PutUint64(b[:], uint64(it.UnixMilli()))
-	case nil:
-	default:
-		err = fmt.Errorf("unknown IndexBucket type %T", it)
-	}
-	return
-}
-
 // Iterate iterates the index, providing access to the index entry, datum, and
 // datum key via the Iter.
-func (idx *Index) Iterate(prefixI IndexBucket, f func(*Iter) error, iterOpts ...IterationOption) error {
-	prefix, err := parseIndexBucket(prefixI)
+func (idx *Index) Iterate(prefixI KV, f func(*Iter) error, iterOpts ...IterationOption) error {
+	prefix, err := parseKV(prefixI)
 	if err != nil {
 		return err
 	}

dex/lexi/lexi.go

@@ -227,12 +227,25 @@ func (db *DB) deleteDBID(txn *badger.Txn, dbID DBID) error {
 	return nil
 }
 
-// B is a byte slice that implements encoding.BinaryMarshaler.
-type B []byte
-
-var _ encoding.BinaryMarshaler = B{}
-
-// MarshalBinary implements encoding.BinaryMarshaler for the B.
-func (b B) MarshalBinary() ([]byte, error) {
-	return b, nil
+// KV is any one of a number of common types whose binary encoding is
+// straight-forward.
+type KV interface{}
+
+func parseKV(i KV) (b []byte, err error) {
+	switch it := i.(type) {
+	case []byte:
+		b = it
+	case uint32:
+		b = make([]byte, 4)
+		binary.BigEndian.PutUint32(b[:], it)
+	case time.Time:
+		b = make([]byte, 8)
+		binary.BigEndian.PutUint64(b[:], uint64(it.UnixMilli()))
+	case encoding.BinaryMarshaler:
+		b, err = it.MarshalBinary()
+	case nil:
+	default:
+		err = fmt.Errorf("unknown IndexBucket type %T", it)
+	}
+	return
 }

dex/lexi/table.go

@@ -36,8 +36,8 @@ func (db *DB) Table(name string) (*Table, error) {
 }
 
 // GetRaw retrieves a value from the Table as raw bytes.
-func (t *Table) GetRaw(k encoding.BinaryMarshaler) (b []byte, err error) {
-	kB, err := k.MarshalBinary()
+func (t *Table) GetRaw(k KV) (b []byte, err error) {
+	kB, err := parseKV(k)
 	if err != nil {
 		return nil, fmt.Errorf("error marshaling key: %w", err)
 	}
@@ -57,7 +57,7 @@ func (t *Table) GetRaw(k encoding.BinaryMarshaler) (b []byte, err error) {
 }
 
 // Get retrieves a value from the Table.
-func (t *Table) Get(k encoding.BinaryMarshaler, thing encoding.BinaryUnmarshaler) error {
+func (t *Table) Get(k KV, thing encoding.BinaryUnmarshaler) error {
 	b, err := t.GetRaw(k)
 	if err != nil {
 		return err
@@ -113,8 +113,8 @@ func (t *Table) UseDefaultSetOptions(setOpts ...SetOption) {
 }
 
 // Set inserts a new value for the key, and creates index entries.
-func (t *Table) Set(k, v encoding.BinaryMarshaler, setOpts ...SetOption) error {
-	kB, err := k.MarshalBinary()
+func (t *Table) Set(k, v KV, setOpts ...SetOption) error {
+	kB, err := parseKV(k)
 	if err != nil {
 		return fmt.Errorf("error marshaling key: %w", err)
 	}
@@ -123,7 +123,7 @@ func (t *Table) Set(k, v encoding.BinaryMarshaler, setOpts ...SetOption) error {
 	if len(kB) == 0 {
 		return errors.New("no zero-length keys allowed")
 	}
-	vB, err := v.MarshalBinary()
+	vB, err := parseKV(v)
 	if err != nil {
 		return fmt.Errorf("error marshaling value: %w", err)
 	}

tatanka/db/bonds.go

@@ -50,7 +50,7 @@ func (bond *dbBond) UnmarshalBinary(b []byte) error {
 }
 
 func (d *DB) StoreBond(newBond *tanka.Bond) error {
-	return d.bonds.Set(lexi.B(newBond.CoinID), &dbBond{newBond}, lexi.WithReplace())
+	return d.bonds.Set(newBond.CoinID[:], &dbBond{newBond}, lexi.WithReplace())
 }
 
 func (d *DB) GetBonds(peerID tanka.PeerID) ([]*tanka.Bond, error) {

tatanka/db/db.go

@@ -5,7 +5,6 @@ package db
 
 import (
 	"context"
-	"encoding"
 	"encoding/binary"
 	"errors"
 	"fmt"
@@ -51,12 +50,12 @@ func New(dir string, log dex.Logger) (*DB, error) {
 	if err != nil {
 		return nil, fmt.Errorf("error initializing meta table: %w", err)
 	}
-	verB, err := metaTable.GetRaw(lexi.B(versionKey))
+	verB, err := metaTable.GetRaw(versionKey)
 	if err != nil {
 		if errors.Is(err, lexi.ErrKeyNotFound) {
 			// fresh install
 			verB = []byte{DBVersion}
-			metaTable.Set(lexi.B(versionKey), lexi.B(verB))
+			metaTable.Set(versionKey, verB)
 		} else {
 			return nil, fmt.Errorf("error getting version")
 		}
@@ -78,7 +77,7 @@ func New(dir string, log dex.Logger) (*DB, error) {
 		return nil, fmt.Errorf("error constructing reputation table: %w", err)
 	}
 	// Scored peer index with timestamp sorting.
-	scoredIdx, err := scoreTable.AddIndex("scored-stamp", func(_, v encoding.BinaryMarshaler) ([]byte, error) {
+	scoredIdx, err := scoreTable.AddIndex("scored-stamp", func(_, v lexi.KV) ([]byte, error) {
 		s, is := v.(*dbScore)
 		if !is {
 			return nil, fmt.Errorf("wrong type %T", v)
@@ -98,7 +97,7 @@ func New(dir string, log dex.Logger) (*DB, error) {
 		return nil, fmt.Errorf("error initializing bonds table: %w", err)
 	}
 	// Retrieve bonds by peer ID.
-	bonderIdx, err := bondsTable.AddIndex("bonder", func(_, v encoding.BinaryMarshaler) ([]byte, error) {
+	bonderIdx, err := bondsTable.AddIndex("bonder", func(_, v lexi.KV) ([]byte, error) {
 		b, is := v.(*dbBond)
 		if !is {
 			return nil, fmt.Errorf("wrong type %T", v)
@@ -109,7 +108,7 @@ func New(dir string, log dex.Logger) (*DB, error) {
 		return nil, fmt.Errorf("error initializing bonder index: %w", err)
 	}
 	// We'll periodically prune expired bonds.
-	bondStampIdx, err := bondsTable.AddIndex("bond-stamp", func(_, v encoding.BinaryMarshaler) ([]byte, error) {
+	bondStampIdx, err := bondsTable.AddIndex("bond-stamp", func(_, v lexi.KV) ([]byte, error) {
 		b, is := v.(*dbBond)
 		if !is {
 			return nil, fmt.Errorf("wrong type %T", v)

tatanka/db/reputation.go

@@ -30,7 +30,7 @@ func (d *DB) SetScore(scored, scorer tanka.PeerID, score int8, stamp time.Time)
 		score:  score,
 		stamp:  stamp,
 	}
-	return d.scores.Set(lexi.B(k), s, lexi.WithReplace())
+	return d.scores.Set(k, s, lexi.WithReplace())
 }
 
 func (d *DB) Reputation(scored tanka.PeerID) (*tanka.Reputation, error) {