Add InMemory Repository

repositories/in_memory.go

@@ -0,0 +1,27 @@
+package repositories
+
+import (
+	"github.com/8thlight/vulcanizedb/core"
+)
+
+type InMemory struct {
+	blocks map[int64]*core.Block
+}
+
+func NewInMemory() *InMemory {
+	return &InMemory{
+		blocks: make(map[int64]*core.Block),
+	}
+}
+
+func (repository *InMemory) CreateBlock(block core.Block) {
+	repository.blocks[block.Number] = &block
+}
+
+func (repository *InMemory) BlockCount() int {
+	return len(repository.blocks)
+}
+
+func (repository *InMemory) FindBlockByNumber(blockNumber int64) *core.Block {
+	return repository.blocks[blockNumber]
+}

repositories/in_memory_test.go

@@ -0,0 +1,141 @@
+package repositories_test
+
+import (
+	"github.com/8thlight/vulcanizedb/core"
+	"github.com/8thlight/vulcanizedb/repositories"
+	_ "github.com/lib/pq"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("The In Memory Repository", func() {
+
+	Describe("Saving blocks", func() {
+		It("starts with no blocks", func() {
+			count := buildRepository().BlockCount()
+			Expect(count).Should(Equal(0))
+		})
+
+		It("increments the block count", func() {
+			block := core.Block{Number: 123}
+			repository := buildRepository()
+
+			repository.CreateBlock(block)
+
+			Expect(repository.BlockCount()).To(Equal(1))
+		})
+
+		It("saves the attributes of the block", func() {
+			blockNumber := int64(123)
+			gasLimit := int64(1000000)
+			gasUsed := int64(10)
+			blockHash := "x123"
+			blockParentHash := "x456"
+			blockNonce := "0x881db2ca900682e9a9"
+			blockTime := int64(1508981640)
+			uncleHash := "x789"
+			blockSize := int64(1000)
+			difficulty := int64(10)
+			block := core.Block{
+				Difficulty: difficulty,
+				GasLimit:   gasLimit,
+				GasUsed:    gasUsed,
+				Hash:       blockHash,
+				Nonce:      blockNonce,
+				Number:     blockNumber,
+				ParentHash: blockParentHash,
+				Size:       blockSize,
+				Time:       blockTime,
+				UncleHash:  uncleHash,
+			}
+
+			repository := buildRepository()
+			repository.CreateBlock(block)
+
+			savedBlock := repository.FindBlockByNumber(blockNumber)
+			Expect(savedBlock.Difficulty).To(Equal(difficulty))
+			Expect(savedBlock.GasLimit).To(Equal(gasLimit))
+			Expect(savedBlock.GasUsed).To(Equal(gasUsed))
+			Expect(savedBlock.Hash).To(Equal(blockHash))
+			Expect(savedBlock.Nonce).To(Equal(blockNonce))
+			Expect(savedBlock.Number).To(Equal(blockNumber))
+			Expect(savedBlock.ParentHash).To(Equal(blockParentHash))
+			Expect(savedBlock.Size).To(Equal(blockSize))
+			Expect(savedBlock.Time).To(Equal(blockTime))
+			Expect(savedBlock.UncleHash).To(Equal(uncleHash))
+		})
+
+		It("does not find a block when searching for a number that does not exist", func() {
+			repository := buildRepository()
+
+			savedBlock := repository.FindBlockByNumber(111)
+
+			Expect(savedBlock).To(BeNil())
+		})
+
+		It("saves one transaction associated to the block", func() {
+			block := core.Block{
+				Number:       123,
+				Transactions: []core.Transaction{{}},
+			}
+			repository := buildRepository()
+
+			repository.CreateBlock(block)
+
+			savedBlock := repository.FindBlockByNumber(123)
+			Expect(len(savedBlock.Transactions)).To(Equal(1))
+		})
+
+		It("saves two transactions associated to the block", func() {
+			block := core.Block{
+				Number:       123,
+				Transactions: []core.Transaction{{}, {}},
+			}
+			repository := buildRepository()
+
+			repository.CreateBlock(block)
+
+			savedBlock := repository.FindBlockByNumber(123)
+			Expect(len(savedBlock.Transactions)).To(Equal(2))
+		})
+
+		It("saves the attributes associated to a transaction", func() {
+			gasLimit := int64(5000)
+			gasPrice := int64(3)
+			nonce := uint64(10000)
+			to := "1234567890"
+			value := int64(10)
+
+			transaction := core.Transaction{
+				Hash:     "x1234",
+				GasPrice: gasPrice,
+				GasLimit: gasLimit,
+				Nonce:    nonce,
+				To:       to,
+				Value:    value,
+			}
+			block := core.Block{
+				Number:       123,
+				Transactions: []core.Transaction{transaction},
+			}
+			repository := buildRepository()
+
+			repository.CreateBlock(block)
+
+			savedBlock := repository.FindBlockByNumber(123)
+			Expect(len(savedBlock.Transactions)).To(Equal(1))
+			savedTransaction := savedBlock.Transactions[0]
+			Expect(savedTransaction.Hash).To(Equal(transaction.Hash))
+			Expect(savedTransaction.To).To(Equal(to))
+			Expect(savedTransaction.Nonce).To(Equal(nonce))
+			Expect(savedTransaction.GasLimit).To(Equal(gasLimit))
+			Expect(savedTransaction.GasPrice).To(Equal(gasPrice))
+			Expect(savedTransaction.Value).To(Equal(value))
+		})
+	})
+
+})
+
+func buildRepository() *repositories.InMemory {
+	return repositories.NewInMemory()
+}