github.com/koko1123/flow-go-1@v0.29.6/storage/badger/index.go (about)

     1  // (c) 2019 Dapper Labs - ALL RIGHTS RESERVED
     2  
     3  package badger
     4  
     5  import (
     6  	"github.com/dgraph-io/badger/v3"
     7  
     8  	"github.com/koko1123/flow-go-1/model/flow"
     9  	"github.com/koko1123/flow-go-1/module"
    10  	"github.com/koko1123/flow-go-1/module/metrics"
    11  	"github.com/koko1123/flow-go-1/storage/badger/operation"
    12  	"github.com/koko1123/flow-go-1/storage/badger/procedure"
    13  	"github.com/koko1123/flow-go-1/storage/badger/transaction"
    14  )
    15  
    16  // Index implements a simple read-only payload storage around a badger DB.
    17  type Index struct {
    18  	db    *badger.DB
    19  	cache *Cache
    20  }
    21  
    22  func NewIndex(collector module.CacheMetrics, db *badger.DB) *Index {
    23  
    24  	store := func(key interface{}, val interface{}) func(*transaction.Tx) error {
    25  		blockID := key.(flow.Identifier)
    26  		index := val.(*flow.Index)
    27  		return transaction.WithTx(procedure.InsertIndex(blockID, index))
    28  	}
    29  
    30  	retrieve := func(key interface{}) func(tx *badger.Txn) (interface{}, error) {
    31  		blockID := key.(flow.Identifier)
    32  		var index flow.Index
    33  		return func(tx *badger.Txn) (interface{}, error) {
    34  			err := procedure.RetrieveIndex(blockID, &index)(tx)
    35  			return &index, err
    36  		}
    37  	}
    38  
    39  	p := &Index{
    40  		db: db,
    41  		cache: newCache(collector, metrics.ResourceIndex,
    42  			withLimit(flow.DefaultTransactionExpiry+100),
    43  			withStore(store),
    44  			withRetrieve(retrieve)),
    45  	}
    46  
    47  	return p
    48  }
    49  
    50  func (i *Index) storeTx(blockID flow.Identifier, index *flow.Index) func(*transaction.Tx) error {
    51  	return i.cache.PutTx(blockID, index)
    52  }
    53  
    54  func (i *Index) retrieveTx(blockID flow.Identifier) func(*badger.Txn) (*flow.Index, error) {
    55  	return func(tx *badger.Txn) (*flow.Index, error) {
    56  		val, err := i.cache.Get(blockID)(tx)
    57  		if err != nil {
    58  			return nil, err
    59  		}
    60  		return val.(*flow.Index), nil
    61  	}
    62  }
    63  
    64  func (i *Index) Store(blockID flow.Identifier, index *flow.Index) error {
    65  	return operation.RetryOnConflictTx(i.db, transaction.Update, i.storeTx(blockID, index))
    66  }
    67  
    68  func (i *Index) ByBlockID(blockID flow.Identifier) (*flow.Index, error) {
    69  	tx := i.db.NewTransaction(false)
    70  	defer tx.Discard()
    71  	return i.retrieveTx(blockID)(tx)
    72  }