datastore-agnostic blockservice based types

README.md

@@ -11,7 +11,7 @@ interfacing with a state database. These interfaces are used to build higher-lev
 which are used to perform the bulk of state related needs.
 
 Ethereum data can be stored on IPFS, standard codecs for Etheruem data are defined in the [go-cid](https://github.com/ipfs/go-cid) library. Here at Vulcanize we
-have [extended IPFS](https://github.com/vulcanize/go-ipfs/releases/tag/v0.4.22-alpha) to [use Postgres](https://github.com/vulcanize/go-ipfs-config/releases/tag/v0.0.8-alpha) as a backing database.
+have [extended IPFS](https://github.com/vulcanize/go-ipfs/releases/tag/v0.4.22-alpha) to [use Postgres](https://github.com/vulcanize/go-ipfs-config/releases/tag/v0.0.8-alpha) as a backing [datastore](https://github.com/ipfs/go-ds-sql/tree/master/postgres).
 Additionally, [we have extended go-ethereum](https://github.com/vulcanize/go-ethereum/releases/tag/v1.9.11-statediff-0.0.2) to enable the efficient export of state data in the form of state diff objects.
 Together, this allows us to store all Ethereum data on Postgres-backed IPFS.
 

batch.go

@@ -17,85 +17,124 @@
 package ipfsethdb
 
 import (
+	"errors"
+
 	"github.com/ethereum/go-ethereum/ethdb"
-	"github.com/jmoiron/sqlx"
+	"github.com/hashicorp/golang-lru"
+	"github.com/ipfs/go-block-format"
+	"github.com/ipfs/go-blockservice"
 )
 
-// Batch is the type that satisfies the ethdb.Batch interface for PG-IPFS Ethereum data
+var (
+	EvictionWarningErr = errors.New("warn: batch has exceeded capacity, data has been evicted")
+)
+
+// Batch is the type that satisfies the ethdb.Batch interface for IPFS Ethereum data using the ipfs blockservice interface
+// This is ipfs-backing-datastore agnostic but must operate through a configured ipfs node (and so is subject to lockfile contention with e.g. an ipfs daemon)
+// If blockservice block exchange is configured the blockservice can fetch data that are missing locally from IPFS peers
 type Batch struct {
-	db   *sqlx.DB
+	blockService          blockservice.BlockService
-	tx   *sqlx.Tx
+	putCache, deleteCache *lru.Cache
-	size int
+	valueSize             int
 }
 
-// NewBatch returns a ethdb.Batch interface for PG-IPFS
+// NewBatch returns a ethdb.Batch interface for IPFS
-func NewBatch(db *sqlx.DB) ethdb.Batch {
+func NewBatch(bs blockservice.BlockService, capacity int) (ethdb.Batch, error) {
-	return &Batch{
+	putCache, err := lru.New(capacity)
-		db: db,
+	if err != nil {
+		return nil, err
 	}
+	deleteCache, err := lru.New(capacity)
+	if err != nil {
+		return nil, err
+	}
+	return &Batch{
+		blockService: bs,
+		putCache:     putCache,
+		deleteCache:  deleteCache,
+	}, nil
 }
 
 // Put satisfies the ethdb.Batch interface
 // Put inserts the given value into the key-value data store
+// Key is expected to be the keccak256 hash of value
+// Returns an error when batch capacity has been exceeded and data was evicted
+// It is up to ensure they do not exceed capacity
+// The alternative is to check the cache len vs its capacity before inserting
+// but this adds additional overhead to every Put/Delete
 func (b *Batch) Put(key []byte, value []byte) (err error) {
-	if b.tx == nil {
+	b.valueSize += len(value)
-		b.Reset()
+	if b.putCache.Add(key, value) {
+		return EvictionWarningErr
 	}
-	mhKey, err := MultihashKeyFromKeccak256(key)
-	if err != nil {
-		return err
-	}
-	if _, err = b.tx.Exec(putPgStr, mhKey, value); err != nil {
-		return err
-	}
-	b.size += len(value)
 	return nil
 }
 
 // Delete satisfies the ethdb.Batch interface
 // Delete removes the key from the key-value data store
 func (b *Batch) Delete(key []byte) (err error) {
-	if b.tx == nil {
+	if b.deleteCache.Add(key, true) {
-		b.Reset()
+		return EvictionWarningErr
 	}
-	mhKey, err := MultihashKeyFromKeccak256(key)
+	return nil
-	if err != nil {
-		return err
-	}
-	_, err = b.tx.Exec(deletePgStr, mhKey)
-	return err
 }
 
 // ValueSize satisfies the ethdb.Batch interface
 // ValueSize retrieves the amount of data queued up for writing
 // The returned value is the total byte length of all data queued to write
 func (b *Batch) ValueSize() int {
-	return b.size
+	return b.valueSize
 }
 
 // Write satisfies the ethdb.Batch interface
 // Write flushes any accumulated data to disk
 func (b *Batch) Write() error {
-	if b.tx == nil {
+	puts := make([]blocks.Block, b.putCache.Len())
-		return nil
+	for i, key := range b.putCache.Keys() {
+		val, _ := b.putCache.Get(key) // don't need to check "ok"s, the key is known and val is always []byte
+		b, err := NewBlock(key.([]byte), val.([]byte))
+		if err != nil {
+			return err
+		}
+		puts[i] = b
 	}
-	return b.tx.Commit()
+	if err := b.blockService.AddBlocks(puts); err != nil {
+		return err
+	}
+	for _, key := range b.deleteCache.Keys() {
+		c, err := Keccak256ToCid(key.([]byte))
+		if err != nil {
+			return err
+		}
+		if err := b.blockService.DeleteBlock(c); err != nil {
+			return err
+		}
+	}
+	return nil
 }
 
 // Replay satisfies the ethdb.Batch interface
 // Replay replays the batch contents
 func (b *Batch) Replay(w ethdb.KeyValueWriter) error {
-	return errNotSupported
+	for _, key := range b.putCache.Keys() {
+		val, _ := b.putCache.Get(key)
+		if err := w.Put(key.([]byte), val.([]byte)); err != nil {
+			return err
+		}
+	}
+	for _, key := range b.deleteCache.Keys() {
+		if err := w.Delete(key.([]byte)); err != nil {
+			return err
+		}
+	}
+	return nil
 }
 
 // Reset satisfies the ethdb.Batch interface
 // Reset resets the batch for reuse
 // This should be called after every write
 func (b *Batch) Reset() {
-	var err error
+	b.deleteCache.Purge()
-	b.tx, err = b.db.Beginx()
+	b.putCache.Purge()
-	if err != nil {
+	b.valueSize = 0
-		panic(err)
-	}
-	b.size = 0
 }

datastore.go

@@ -0,0 +1,207 @@
+// VulcanizeDB
+// Copyright © 2020 Vulcanize
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package ipfsethdb
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/ethereum/go-ethereum/ethdb"
+	"github.com/ipfs/go-blockservice"
+)
+
+var (
+	defaultBatchCapacity = 1024
+	errNotSupported      = errors.New("this operation is not supported")
+)
+
+// Database is the type that satisfies the ethdb.Database and ethdb.KeyValueStore interfaces for IPFS Ethereum data
+// This is ipfs-backing-datastore agnostic but must operate through a configured ipfs node (and so is subject to lockfile contention with e.g. an ipfs daemon)
+// If blockservice block exchange is configured the blockservice can fetch data that are missing locally from IPFS peers
+type Database struct {
+	blockService blockservice.BlockService
+}
+
+// NewKeyValueStore returns a ethdb.KeyValueStore interface for IPFS
+func NewKeyValueStore(bs blockservice.BlockService) ethdb.KeyValueStore {
+	return &Database{
+		blockService: bs,
+	}
+}
+
+// NewDatabase returns a ethdb.Database interface for IPFS
+func NewDatabase(bs blockservice.BlockService) ethdb.Database {
+	return &Database{
+		blockService: bs,
+	}
+}
+
+// Has satisfies the ethdb.KeyValueReader interface
+// Has retrieves if a key is present in the key-value data store
+// This only operates on the local blockstore not through the exchange
+func (d *Database) Has(key []byte) (bool, error) {
+	c, err := Keccak256ToCid(key) // we are using cidv0 because we don't know the codec and codec doesn't matter, the datastore key is multihash-only derived
+	if err != nil {
+		return false, err
+	}
+	return d.blockService.Blockstore().Has(c)
+}
+
+// Get satisfies the ethdb.KeyValueReader interface
+// Get retrieves the given key if it's present in the key-value data store
+func (d *Database) Get(key []byte) ([]byte, error) {
+	c, err := Keccak256ToCid(key)
+	if err != nil {
+		return nil, err
+	}
+	block, err := d.blockService.GetBlock(context.Background(), c)
+	return block.RawData(), err
+}
+
+// Put satisfies the ethdb.KeyValueWriter interface
+// Put inserts the given value into the key-value data store
+// Key is expected to be the keccak256 hash of value
+func (d *Database) Put(key []byte, value []byte) error {
+	b, err := NewBlock(key, value)
+	if err != nil {
+		return err
+	}
+	return d.blockService.AddBlock(b)
+}
+
+// Delete satisfies the ethdb.KeyValueWriter interface
+// Delete removes the key from the key-value data store
+func (d *Database) Delete(key []byte) error {
+	c, err := Keccak256ToCid(key)
+	if err != nil {
+		return err
+	}
+	return d.blockService.DeleteBlock(c)
+}
+
+// DatabaseProperty enum type
+type DatabaseProperty int
+
+const (
+	Unknown DatabaseProperty = iota
+	ExchangeOnline
+)
+
+// DatabasePropertyFromString helper function
+func DatabasePropertyFromString(property string) (DatabaseProperty, error) {
+	switch strings.ToLower(property) {
+	case "exchange", "online":
+		return ExchangeOnline, nil
+	default:
+		return Unknown, fmt.Errorf("unknown database property")
+	}
+}
+
+// Stat satisfies the ethdb.Stater interface
+// Stat returns a particular internal stat of the database
+func (d *Database) Stat(property string) (string, error) {
+	prop, err := DatabasePropertyFromString(property)
+	if err != nil {
+		return "", err
+	}
+	switch prop {
+	case ExchangeOnline:
+		online := d.blockService.Exchange().IsOnline()
+		return strconv.FormatBool(online), nil
+	default:
+		return "", fmt.Errorf("unhandled database property")
+	}
+}
+
+// Compact satisfies the ethdb.Compacter interface
+// Compact flattens the underlying data store for the given key range
+func (d *Database) Compact(start []byte, limit []byte) error {
+	return errNotSupported
+}
+
+// NewBatch satisfies the ethdb.Batcher interface
+// NewBatch creates a write-only database that buffers changes to its host db
+// until a final write is called
+func (d *Database) NewBatch() ethdb.Batch {
+	b, err := NewBatch(d.blockService, defaultBatchCapacity)
+	if err != nil {
+		panic(err)
+	}
+	return b
+}
+
+// NewIterator satisfies the ethdb.Iteratee interface
+// it creates a binary-alphabetical iterator over a subset
+// of database content with a particular key prefix, starting at a particular
+// initial key (or after, if it does not exist).
+//
+// Note: This method assumes that the prefix is NOT part of the start, so there's
+// no need for the caller to prepend the prefix to the start
+func (d *Database) NewIterator(prefix []byte, start []byte) ethdb.Iterator {
+	return NewIterator(start, prefix, d.blockService)
+}
+
+// Close satisfies the io.Closer interface
+// Close closes the db connection
+func (d *Database) Close() error {
+	return d.blockService.Close()
+}
+
+// HasAncient satisfies the ethdb.AncientReader interface
+// HasAncient returns an indicator whether the specified data exists in the ancient store
+func (d *Database) HasAncient(kind string, number uint64) (bool, error) {
+	return false, errNotSupported
+}
+
+// Ancient satisfies the ethdb.AncientReader interface
+// Ancient retrieves an ancient binary blob from the append-only immutable files
+func (d *Database) Ancient(kind string, number uint64) ([]byte, error) {
+	return nil, errNotSupported
+}
+
+// Ancients satisfies the ethdb.AncientReader interface
+// Ancients returns the ancient item numbers in the ancient store
+func (d *Database) Ancients() (uint64, error) {
+	return 0, errNotSupported
+}
+
+// AncientSize satisfies the ethdb.AncientReader interface
+// AncientSize returns the ancient size of the specified category
+func (d *Database) AncientSize(kind string) (uint64, error) {
+	return 0, errNotSupported
+}
+
+// AppendAncient satisfies the ethdb.AncientWriter interface
+// AppendAncient injects all binary blobs belong to block at the end of the append-only immutable table files
+func (d *Database) AppendAncient(number uint64, hash, header, body, receipt, td []byte) error {
+	return errNotSupported
+}
+
+// TruncateAncients satisfies the ethdb.AncientWriter interface
+// TruncateAncients discards all but the first n ancient data from the ancient store
+func (d *Database) TruncateAncients(n uint64) error {
+	return errNotSupported
+}
+
+// Sync satisfies the ethdb.AncientWriter interface
+// Sync flushes all in-memory ancient store data to disk
+func (d *Database) Sync() error {
+	return errNotSupported
+}

go.mod

@@ -4,11 +4,15 @@ go 1.13
 
 require (
 	github.com/ethereum/go-ethereum v1.9.15
+	github.com/hashicorp/golang-lru v0.5.4
+	github.com/ipfs/go-block-format v0.0.2
+	github.com/ipfs/go-blockservice v0.1.3
+	github.com/ipfs/go-cid v0.0.5
 	github.com/ipfs/go-ipfs-blockstore v1.0.0
 	github.com/ipfs/go-ipfs-ds-help v1.0.0
 	github.com/jmoiron/sqlx v1.2.0
 	github.com/lib/pq v1.0.0
 	github.com/multiformats/go-multihash v0.0.13
-	github.com/onsi/ginkgo v1.7.0
+	github.com/onsi/ginkgo v1.8.0
-	github.com/onsi/gomega v1.4.3
+	github.com/onsi/gomega v1.5.0
 )

go.sum

@@ -1,3 +1,4 @@
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@@ -148,8 +277,12 @@ github.com/olekukonko/tablewriter v0.0.2-0.20190409134802-7e037d187b0c/go.mod h1
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@@ -170,6 +303,8 @@ github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQD
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 golang.org/x/crypto v0.0.0-20190211182817-74369b46fc67/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
+golang.org/x/crypto v0.0.0-20190225124518-7f87c0fbb88b/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20190426145343-a29dc8fdc734/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20190513172903-22d7a77e9e5f/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20190530122614-20be4c3c3ed5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190611184440-5c40567a22f8/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20200311171314-f7b00557c8c4 h1:QmwruyY+bKbDDL0BaglrbZABEali68eoMFhTZpCjYVA=
 golang.org/x/crypto v0.0.0-20200311171314-f7b00557c8c4/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
@@ -197,6 +343,7 @@ golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73r
 golang.org/x/net v0.0.0-20181011144130-49bb7cea24b1/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190227160552-c95aed5357e7/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20190611141213-3f473d35a33a/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200425230154-ff2c4b7c35a0 h1:Jcxah/M+oLZ/R4/z5RzfPzGbPXnVDPkEDtf2JnuxN+U=
 golang.org/x/net v0.0.0-20200425230154-ff2c4b7c35a0/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -206,7 +353,9 @@ golang.org/x/sys v0.0.0-20181107165924-66b7b1311ac8/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190219092855-153ac476189d/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190228124157-a34e9553db1e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190610200419-93c9922d18ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd h1:xhmwyvizuTgC2qz7ZlMluP20uW+C3Rm0FD/WLDX8884=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -216,6 +365,7 @@ golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxb
 golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/genproto v0.0.0-20180831171423-11092d34479b/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

iterator.go

@@ -17,27 +17,29 @@
 package ipfsethdb
 
 import (
+	"context"
+
 	"github.com/ethereum/go-ethereum/ethdb"
-	"github.com/jmoiron/sqlx"
+	"github.com/ipfs/go-blockservice"
 )
 
-// Iterator is the type that satisfies the ethdb.Iterator interface for PG-IPFS Ethereum data
+// Iterator is the type that satisfies the ethdb.Iterator interface for IPFS Ethereum data
 // Iteratee interface is used in Geth for various tests, trie/sync_bloom.go (for fast sync),
 // rawdb.InspectDatabase, and the new core/state/snapshot features.
 // This should not be confused with trie.NodeIterator or state.NodeIteraor (which can be constructed
 // from the ethdb.KeyValueStoreand ethdb.Database interfaces)
 type Iterator struct {
-	db                 *sqlx.DB
+	blockService       blockservice.BlockService
 	currentKey, prefix []byte
 	err                error
 }
 
-// NewIterator returns a ethdb.Iterator interface for PG-IPFS
+// NewIterator returns an ethdb.Iterator interface for PG-IPFS
-func NewIterator(start, prefix []byte, db *sqlx.DB) ethdb.Iterator {
+func NewIterator(start, prefix []byte, bs blockservice.BlockService) ethdb.Iterator {
 	return &Iterator{
-		db:         db,
+		blockService: bs,
-		prefix:     prefix,
+		prefix:       prefix,
-		currentKey: start,
+		currentKey:   start,
 	}
 }
 
@@ -70,19 +72,22 @@ func (i *Iterator) Key() []byte {
 // The caller should not modify the contents of the returned slice
 // and its contents may change on the next call to Next
 func (i *Iterator) Value() []byte {
-	mhKey, err := MultihashKeyFromKeccak256(i.currentKey)
+	c, err := Keccak256ToCid(i.currentKey)
 	if err != nil {
 		i.err = err
 		return nil
 	}
-	var data []byte
+	block, err := i.blockService.GetBlock(context.Background(), c)
-	i.err = i.db.Get(&data, getPgStr, mhKey)
+	if err != nil {
-	return data
+		i.err = err
+		return nil
+	}
+	return block.RawData()
 }
 
 // Release satisfies the ethdb.Iterator interface
 // Release releases associated resources
 // Release should always succeed and can be called multiple times without causing error
 func (i *Iterator) Release() {
-	i.db.Close()
+	i.blockService.Close()
 }

postgres/batch.go

@@ -0,0 +1,104 @@
+// VulcanizeDB
+// Copyright © 2020 Vulcanize
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package pgipfsethdb
+
+import (
+	"github.com/ethereum/go-ethereum/ethdb"
+	"github.com/jmoiron/sqlx"
+
+	"github.com/vulcanize/pg-ipfs-ethdb"
+)
+
+// Batch is the type that satisfies the ethdb.Batch interface for PG-IPFS Ethereum data using a direct Postgres connection
+type Batch struct {
+	db        *sqlx.DB
+	tx        *sqlx.Tx
+	valueSize int
+}
+
+// NewBatch returns a ethdb.Batch interface for PG-IPFS
+func NewBatch(db *sqlx.DB) ethdb.Batch {
+	return &Batch{
+		db: db,
+	}
+}
+
+// Put satisfies the ethdb.Batch interface
+// Put inserts the given value into the key-value data store
+// Key is expected to be the keccak256 hash of value
+func (b *Batch) Put(key []byte, value []byte) (err error) {
+	if b.tx == nil {
+		b.Reset()
+	}
+	mhKey, err := ipfsethdb.MultihashKeyFromKeccak256(key)
+	if err != nil {
+		return err
+	}
+	if _, err = b.tx.Exec(putPgStr, mhKey, value); err != nil {
+		return err
+	}
+	b.valueSize += len(value)
+	return nil
+}
+
+// Delete satisfies the ethdb.Batch interface
+// Delete removes the key from the key-value data store
+func (b *Batch) Delete(key []byte) (err error) {
+	if b.tx == nil {
+		b.Reset()
+	}
+	mhKey, err := ipfsethdb.MultihashKeyFromKeccak256(key)
+	if err != nil {
+		return err
+	}
+	_, err = b.tx.Exec(deletePgStr, mhKey)
+	return err
+}
+
+// ValueSize satisfies the ethdb.Batch interface
+// ValueSize retrieves the amount of data queued up for writing
+// The returned value is the total byte length of all data queued to write
+func (b *Batch) ValueSize() int {
+	return b.valueSize
+}
+
+// Write satisfies the ethdb.Batch interface
+// Write flushes any accumulated data to disk
+func (b *Batch) Write() error {
+	if b.tx == nil {
+		return nil
+	}
+	return b.tx.Commit()
+}
+
+// Replay satisfies the ethdb.Batch interface
+// Replay replays the batch contents
+func (b *Batch) Replay(w ethdb.KeyValueWriter) error {
+	return errNotSupported
+}
+
+// Reset satisfies the ethdb.Batch interface
+// Reset resets the batch for reuse
+// This should be called after every write
+func (b *Batch) Reset() {
+	var err error
+	b.tx, err = b.db.Beginx()
+	if err != nil {
+		panic(err)
+	}
+	b.valueSize = 0
+}

postgres/batch_test.go

@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-package ipfsethdb_test
+package pgipfsethdb_test
 
 import (
 	"math/big"
@@ -26,6 +26,7 @@ import (
 	. "github.com/onsi/gomega"
 
 	"github.com/vulcanize/pg-ipfs-ethdb"
+	"github.com/vulcanize/pg-ipfs-ethdb/postgres"
 )
 
 var (
@@ -39,7 +40,7 @@ var _ = Describe("Batch", func() {
 	BeforeEach(func() {
 		db, err = ipfsethdb.TestDB()
 		Expect(err).ToNot(HaveOccurred())
-		database = ipfsethdb.NewDatabase(db)
+		database = pgipfsethdb.NewDatabase(db)
 		batch = database.NewBatch()
 	})
 	AfterEach(func() {

postgres/database.go

@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-package ipfsethdb
+package pgipfsethdb
 
 import (
 	"errors"
@@ -23,6 +23,8 @@ import (
 
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/jmoiron/sqlx"
+
+	"github.com/vulcanize/pg-ipfs-ethdb"
 )
 
 var errNotSupported = errors.New("this operation is not supported")
@@ -35,7 +37,7 @@ var (
 	dbSizePgStr = "SELECT pg_database_size(current_database())"
 )
 
-// Database is the type that satisfies the ethdb.Database and ethdb.KeyValueStore interfaces for PG-IPFS Ethereum data
+// Database is the type that satisfies the ethdb.Database and ethdb.KeyValueStore interfaces for PG-IPFS Ethereum data using a direct Postgres connection
 type Database struct {
 	db *sqlx.DB
 }
@@ -57,7 +59,7 @@ func NewDatabase(db *sqlx.DB) ethdb.Database {
 // Has satisfies the ethdb.KeyValueReader interface
 // Has retrieves if a key is present in the key-value data store
 func (d *Database) Has(key []byte) (bool, error) {
-	mhKey, err := MultihashKeyFromKeccak256(key)
+	mhKey, err := ipfsethdb.MultihashKeyFromKeccak256(key)
 	if err != nil {
 		return false, err
 	}
@@ -68,7 +70,7 @@ func (d *Database) Has(key []byte) (bool, error) {
 // Get satisfies the ethdb.KeyValueReader interface
 // Get retrieves the given key if it's present in the key-value data store
 func (d *Database) Get(key []byte) ([]byte, error) {
-	mhKey, err := MultihashKeyFromKeccak256(key)
+	mhKey, err := ipfsethdb.MultihashKeyFromKeccak256(key)
 	if err != nil {
 		return nil, err
 	}
@@ -78,8 +80,9 @@ func (d *Database) Get(key []byte) ([]byte, error) {
 
 // Put satisfies the ethdb.KeyValueWriter interface
 // Put inserts the given value into the key-value data store
+// Key is expected to be the keccak256 hash of value
 func (d *Database) Put(key []byte, value []byte) error {
-	mhKey, err := MultihashKeyFromKeccak256(key)
+	mhKey, err := ipfsethdb.MultihashKeyFromKeccak256(key)
 	if err != nil {
 		return err
 	}
@@ -90,7 +93,7 @@ func (d *Database) Put(key []byte, value []byte) error {
 // Delete satisfies the ethdb.KeyValueWriter interface
 // Delete removes the key from the key-value data store
 func (d *Database) Delete(key []byte) error {
-	mhKey, err := MultihashKeyFromKeccak256(key)
+	mhKey, err := ipfsethdb.MultihashKeyFromKeccak256(key)
 	if err != nil {
 		return err
 	}

postgres/database_test.go

@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-package ipfsethdb_test
+package pgipfsethdb_test
 
 import (
 	"math/big"
@@ -27,6 +27,7 @@ import (
 	. "github.com/onsi/gomega"
 
 	"github.com/vulcanize/pg-ipfs-ethdb"
+	"github.com/vulcanize/pg-ipfs-ethdb/postgres"
 )
 
 var (
@@ -43,7 +44,7 @@ var _ = Describe("Database", func() {
 	BeforeEach(func() {
 		db, err = ipfsethdb.TestDB()
 		Expect(err).ToNot(HaveOccurred())
-		database = ipfsethdb.NewDatabase(db)
+		database = pgipfsethdb.NewDatabase(db)
 	})
 	AfterEach(func() {
 		err = ipfsethdb.ResetTestDB(db)

postgres/iterator.go

@@ -0,0 +1,90 @@
+// VulcanizeDB
+// Copyright © 2020 Vulcanize
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package pgipfsethdb
+
+import (
+	"github.com/ethereum/go-ethereum/ethdb"
+	"github.com/jmoiron/sqlx"
+
+	"github.com/vulcanize/pg-ipfs-ethdb"
+)
+
+// Iterator is the type that satisfies the ethdb.Iterator interface for PG-IPFS Ethereum data using a direct Postgres connection
+// Iteratee interface is used in Geth for various tests, trie/sync_bloom.go (for fast sync),
+// rawdb.InspectDatabase, and the new core/state/snapshot features.
+// This should not be confused with trie.NodeIterator or state.NodeIteraor (which can be constructed
+// from the ethdb.KeyValueStoreand ethdb.Database interfaces)
+type Iterator struct {
+	db                 *sqlx.DB
+	currentKey, prefix []byte
+	err                error
+}
+
+// NewIterator returns an ethdb.Iterator interface for PG-IPFS
+func NewIterator(start, prefix []byte, db *sqlx.DB) ethdb.Iterator {
+	return &Iterator{
+		db:         db,
+		prefix:     prefix,
+		currentKey: start,
+	}
+}
+
+// Next satisfies the ethdb.Iterator interface
+// Next moves the iterator to the next key/value pair
+// It returns whether the iterator is exhausted
+func (i *Iterator) Next() bool {
+	// this is complicated by the ipfs db keys not being the keccak256 hashes
+	// go-ethereum usage of this method expects the iteration to occur over keccak256 keys
+	panic("implement me: Next")
+}
+
+// Error satisfies the ethdb.Iterator interface
+// Error returns any accumulated error
+// Exhausting all the key/value pairs is not considered to be an error
+func (i *Iterator) Error() error {
+	return i.err
+}
+
+// Key satisfies the ethdb.Iterator interface
+// Key returns the key of the current key/value pair, or nil if done
+// The caller should not modify the contents of the returned slice
+// and its contents may change on the next call to Next
+func (i *Iterator) Key() []byte {
+	return i.currentKey
+}
+
+// Value satisfies the ethdb.Iterator interface
+// Value returns the value of the current key/value pair, or nil if done
+// The caller should not modify the contents of the returned slice
+// and its contents may change on the next call to Next
+func (i *Iterator) Value() []byte {
+	mhKey, err := ipfsethdb.MultihashKeyFromKeccak256(i.currentKey)
+	if err != nil {
+		i.err = err
+		return nil
+	}
+	var data []byte
+	i.err = i.db.Get(&data, getPgStr, mhKey)
+	return data
+}
+
+// Release satisfies the ethdb.Iterator interface
+// Release releases associated resources
+// Release should always succeed and can be called multiple times without causing error
+func (i *Iterator) Release() {
+	i.db.Close()
+}

postgres/postgres_suite_test.go

@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-package ipfsethdb_test
+package pgipfsethdb_test
 
 import (
 	"testing"
@@ -23,7 +23,7 @@ import (
 	. "github.com/onsi/gomega"
 )
 
-func TestIPFSPGIPFSETHDB(t *testing.T) {
+func TestPGIPFSETHDB(t *testing.T) {
 	RegisterFailHandler(Fail)
 	RunSpecs(t, "PG-IPFS ethdb test")
 }

util.go

@@ -17,6 +17,8 @@
 package ipfsethdb
 
 import (
+	"github.com/ipfs/go-block-format"
+	"github.com/ipfs/go-cid"
 	"github.com/ipfs/go-ipfs-blockstore"
 	"github.com/ipfs/go-ipfs-ds-help"
 	"github.com/jmoiron/sqlx"
@@ -25,8 +27,8 @@ import (
 )
 
 // MultihashKeyFromKeccak256 converts keccak256 hash bytes into a blockstore-prefixed multihash db key string
-func MultihashKeyFromKeccak256(b []byte) (string, error) {
+func MultihashKeyFromKeccak256(h []byte) (string, error) {
-	mh, err := multihash.Encode(b, multihash.KECCAK_256)
+	mh, err := multihash.Encode(h, multihash.KECCAK_256)
 	if err != nil {
 		return "", err
 	}
@@ -47,3 +49,21 @@ func ResetTestDB(db *sqlx.DB) error {
 	_, err := db.Exec("TRUNCATE public.blocks")
 	return err
 }
+
+// Keccak256ToCid takes a keccak256 hash and returns its cid v0 using the provided codec.
+func Keccak256ToCid(h []byte) (cid.Cid, error) {
+	buf, err := multihash.Encode(h, multihash.KECCAK_256)
+	if err != nil {
+		return cid.Cid{}, err
+	}
+	return cid.NewCidV0(multihash.Multihash(buf)), nil
+}
+
+// NewBlock takes a keccak256 hash key and the rlp []byte value it was derived from and creates an ipfs block object
+func NewBlock(key, value []byte) (blocks.Block, error) {
+	c, err := Keccak256ToCid(key) // we are using cidv0 because we don't know the codec and codec doesn't matter, the datastore key is multihash-only derived
+	if err != nil {
+		return nil, err
+	}
+	return blocks.NewBlockWithCid(value, c)
+}