Minor changes

.idea/.gitignore

@@ -1,8 +0,0 @@
-# Default ignored files
-/shelf/
-/workspace.xml
-# Editor-based HTTP Client requests
-/httpRequests/
-# Datasource local storage ignored files
-/dataSources/
-/dataSources.local.xml

.idea/vcs.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="VcsDirectoryMappings">
-    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+    <mapping directory="" vcs="Git" />
   </component>
 </project>

common/base_errors.go

@@ -0,0 +1,50 @@
+package common
+
+import (
+	"errors"
+	"github.com/matchsystems/werr"
+	"net/http"
+)
+
+var (
+	ErrNotImplemented = errors.New("not implemented yet")
+
+	ErrCanceled            = errors.New("canceled")
+	ErrDeadlineExceeded    = errors.New("deadline exceeded")
+	ErrRemoteServiceFailed = errors.New("remote service failed")
+
+	ErrInvalidAction   = errors.New("invalid action")
+	ErrInvalidArgument = errors.New("invalid argument")
+	ErrOutOfRange      = errors.New("out of range")
+
+	ErrPermissionDenied = errors.New("permission denied")
+	ErrUnauthenticated  = errors.New("unauthenticated")
+
+	ErrEntityExists   = errors.New("entity already exists")
+	ErrEntityNotFound = errors.New("entity not found")
+	ErrEntityOutdated = errors.New("entity outdated")
+)
+
+func GetHttpCode(err error) int {
+	err = werr.UnwrapAll(err)
+	switch {
+	case errors.Is(err, ErrNotImplemented):
+		return http.StatusNotImplemented
+	case errors.Is(err, ErrCanceled), errors.Is(err, ErrDeadlineExceeded):
+		return http.StatusRequestTimeout
+	case errors.Is(err, ErrRemoteServiceFailed):
+		return http.StatusServiceUnavailable
+	case errors.Is(err, ErrInvalidAction), errors.Is(err, ErrInvalidArgument), errors.Is(err, ErrOutOfRange):
+		return http.StatusBadRequest
+	case errors.Is(err, ErrPermissionDenied):
+		return http.StatusForbidden
+	case errors.Is(err, ErrUnauthenticated):
+		return http.StatusUnauthorized
+	case errors.Is(err, ErrEntityExists):
+		return http.StatusConflict
+	case errors.Is(err, ErrEntityNotFound):
+		return http.StatusNotFound
+	default:
+		return http.StatusInternalServerError
+	}
+}

common/block.go

@@ -1,10 +1,138 @@
 package common
 
+import (
+	"bytes"
+	"crypto/sha512"
+	"encoding/binary"
+	"encoding/json"
+	"github.com/matchsystems/werr"
+	"io"
+	"time"
+)
+
+// BlockSecsDiff is the time in second that passes
+// between blocks rotation
+const BlockSecsDiff = 100
+
+func GetBlockId(t time.Time) int64 {
+	// because number is int -- it will just cut off the floating point part
+	return (t.UTC().Unix() / BlockSecsDiff) * BlockSecsDiff
+}
+
 type BlockJson struct {
+	Id           int64             `json:"id"`
+	PrevHash     string            `json:"prev_hash"`
+	Hash         string            `json:"hash"`
+	TXs          []json.RawMessage `json:"txs"`
+	IsFinished   bool              `json:"is_finished"`
+	ByteEncoding string            `json:"byte_encoding"`
 }
 
 type Block struct {
 	Id         int64
 	PrevHash   []byte
 	Hash       []byte
+	TXs        []*Tx
+	IsFinished bool
+}
+
+func (block *Block) CalcHash() ([]byte, error) {
+	hash := sha512.New()
+	if err := binary.Write(hash, binary.BigEndian, block.Id); err != nil {
+		return nil, werr.Wrapf(err, "failed to write block id into hash buffer for block %d", block.Id)
+	}
+	hash.Write(block.PrevHash)
+	for _, tx := range block.TXs {
+		hash.Write(tx.Hash)
+	}
+	return hash.Sum(nil), nil
+}
+
+// ValidateHash calculates new block hash and compares it to current block.Hash
+// returning is block hash is valid
+func (block *Block) ValidateHash() bool {
+	hash, err := block.CalcHash()
+	if err != nil {
+		return false
+	}
+	return bytes.Equal(block.Hash, hash)
+}
+
+// ValidateTXs returns the number of invalid transactions
+// and map of hashes : reasons why txs were invalid.
+// If invalid count > 0 -- the whole block isn't legit
+func (block *Block) ValidateTXs() (invalidCount int, invalidTXs map[string]string) {
+	invalidTXs = make(map[string]string)
+	for _, tx := range block.TXs {
+		if err := tx.Validate(); err != nil {
+			invalidTXs[tx.HashString()] = err.Error()
+			invalidCount++
+		}
+	}
+	return invalidCount, invalidTXs
+}
+
+func (block *Block) ToJSON(byteEncodingStr string) ([]byte, error) {
+	encoding, err := GetEncoding(byteEncodingStr)
+	if err != nil {
+		return nil, err
+	}
+	var txData json.RawMessage
+	txsData := make([]json.RawMessage, len(block.TXs))
+	for i, tx := range block.TXs {
+		if txData, err = tx.ToJSON(byteEncodingStr); err != nil {
+			return nil, werr.Wrapf(err, "error while converting transaction to JSON %d", i)
+		}
+		txsData[i] = txData
+	}
+	data := &BlockJson{
+		Id:         block.Id,
+		PrevHash:   encoding.EncodeToString(block.PrevHash),
+		Hash:       encoding.EncodeToString(block.Hash),
+		TXs:        txsData,
+		IsFinished: block.IsFinished,
+	}
+	jsonBytes, err := json.Marshal(data)
+	if err != nil {
+		return nil, werr.Wrapf(err, "error while marshaling")
+	}
+	return jsonBytes, err
+}
+
+func (block *BlockJson) Process() (*Block, error) {
+	var err error
+	txs := make([]*Tx, len(block.TXs))
+	for i, jsonTx := range block.TXs {
+		if txs[i], err = TxFromJSON(jsonTx); err != nil {
+			return nil, err
+		}
+	}
+	out := &Block{
+		Id:         block.Id,
+		TXs:        txs,
+		IsFinished: block.IsFinished,
+	}
+	encoding, err := GetEncoding(block.ByteEncoding)
+	if err != nil {
+		return nil, err
+	}
+	if out.Hash, err = encoding.DecodeString(block.Hash); err != nil {
+		return nil, werr.Wrapf(err, "error while decoding hash")
+	}
+	return out, nil
+}
+
+func BlockFromJSON(marshaledData []byte) (opts *Block, err error) {
+	data := &BlockJson{}
+	if err := json.Unmarshal(marshaledData, data); err != nil {
+		return nil, werr.Wrapf(err, "error while unmarshaling")
+	}
+	return data.Process()
+}
+func BlockFromJsonReader(r io.Reader) (opts *Block, err error) {
+	data := &BlockJson{}
+	if err := json.NewDecoder(r).Decode(&data); err != nil {
+		return nil, werr.Wrapf(err, "error while unmarshaling")
+	}
+	return data.Process()
 }

common/block_test.go

@@ -0,0 +1,3 @@
+package common
+
+// TODO

common/burning.go

@@ -7,3 +7,18 @@ const BurningRate = 0.001
 func CalcBurning(trxAmount float64) float64 {
 	return BurningRate * math.Sqrt(trxAmount)
 }
+
+// ValidateBurning doesn't return valid/invalid like usual Validate functions.
+// Instead, it returns difference between expected and set values.
+// Bcs of a differences in how programming languages might be implemented
+// or approach numeric types (yes, JS, I'm about u) we might not get exactly the same burning amount,
+// but still it should be a very close value.
+// To get boolean value -- use ValidateBurningBool instead
+func ValidateBurning(tx *Tx) float64 {
+	return CalcBurning(tx.Amount) - tx.AmountBurned
+}
+
+func ValidateBurningBool(tx *Tx) bool {
+	// Let's say, that before that count of digits we shouldn't have any mistake
+	return math.Abs(ValidateBurning(tx)) < 0.1e-10
+}

common/common.go

@@ -3,7 +3,7 @@ package common
 import (
 	"encoding/base64"
 	"encoding/binary"
-	"errors"
+	"github.com/matchsystems/werr"
 )
 
 const (
@@ -11,6 +11,7 @@ const (
 	EncodingRawStd = "encoring_row_std"
 )
 
+// GetEncoding Returns base64 encoding based on the provided string
 func GetEncoding(encoding string) (*base64.Encoding, error) {
 	switch encoding {
 	case EncodingRawUrl:
@@ -18,12 +19,11 @@ func GetEncoding(encoding string) (*base64.Encoding, error) {
 	case EncodingRawStd:
 		return base64.RawStdEncoding, nil
 	default:
-		return nil, errors.New("unsupported encoding")
+		return nil, werr.Wrapf(ErrInvalidArgument, "unknown encoding %s", encoding)
 	}
 }
 
 // float64ToBytes converts float64 to []byte
-// May be moved to nettools later
 func float64ToBytes(f float64) []byte {
 	buf := make([]byte, 8)
 	binary.BigEndian.PutUint64(buf, uint64(f))

common/get_txs.go

@@ -0,0 +1,34 @@
+package common
+
+import "encoding/json"
+
+const ()
+
+type GetTxOpts struct {
+	TxHash       []byte `param:"tx_hash"`
+	UserPubKey   []byte `param:"user_pub_key"`
+	GetSent      bool   `param:"get_sent"`
+	GetReceived  bool   `param:"get_received"`
+	OrderAsc     bool   `param:"order_asc"`
+	Limit        int    `param:"limit"`
+	Offset       int    `param:"offset"`
+	Before       int64  `param:"before"`
+	After        int64  `param:"after"`
+	ByteEncoding string `param:"byte_encoding"`
+}
+
+type GetTxRespJson struct {
+	TXs        []TxJson `json:"txs"`
+	PendingTXs []TxJson `json:"pending_txs"`
+	Count      int      `json:"count"`
+
+	ByteEncoding string `json:"byte_encoding"`
+}
+type GetTxResp struct {
+	TXs        []Tx
+	PendingTXs []Tx
+}
+
+func (resp *GetTxResp) ToJson() ([]byte, error) {
+	return
+}

common/node_info.go

@@ -0,0 +1,5 @@
+package common
+
+type NodeInfo struct {
+	NodeVersion string `json:"node_version"`
+}

common/tx.go

@@ -23,10 +23,6 @@ func GetTxHash(receiverPubKey []byte, message string, amount float64, blockId, t
 	return hash.Sum(nil)
 }
 
-func GetBlockId(t time.Time) int64 {
-	return (t.UTC().Unix() / 100) * 100
-}
-
 type NewTxOptsJson struct {
 	Hash string `json:"hash"` // use function GetTxHash
 	// (CreatedAt / 100) * 100
@@ -103,7 +99,7 @@ func MakeNewTxOpts(senderPubKey, senderPrivateKey, receiverPubKey []byte,
 	now := time.Now().UTC()
 	createdAt := now.Unix()
 	createdAtNs := now.UnixNano()
-	blockId := (createdAt / 100) * 100
+	blockId := (createdAt / BlockSecsDiff) * BlockSecsDiff
 	txHash := GetTxHash(receiverPubKey, msg, amount, blockId, createdAt, createdAtNs)
 	sig := ed25519.Sign(senderPrivateKey, txHash)
 	return &NewTxOpts{
@@ -121,7 +117,7 @@ func MakeNewTxOpts(senderPubKey, senderPrivateKey, receiverPubKey []byte,
 }
 
 func (opts *NewTxOpts) ValidateBlockId() (valid bool) {
-	return opts.BlockId == (opts.CreatedAt/100)*100
+	return opts.BlockId == (opts.CreatedAt/BlockSecsDiff)*BlockSecsDiff
 }
 func (opts *NewTxOpts) ValidateHash() (valid bool) {
 	return bytes.Equal(opts.Hash, GetTxHash(
@@ -131,17 +127,40 @@ func (opts *NewTxOpts) ValidateHash() (valid bool) {
 func (opts *NewTxOpts) ValidateSignature() (valid bool) {
 	return ed25519.Verify(opts.SenderPublicKey, opts.Hash, opts.Signature)
 }
-
-func (opts *Tx) ValidateBlockId() (valid bool) {
-	return opts.BlockId == (opts.CreatedAt/100)*100
+func (opts *NewTxOpts) Validate() (err error) {
+	switch {
+	case !opts.ValidateBlockId():
+		return werr.Wrapf(ErrInvalidArgument, "invalid block id")
+	case !opts.ValidateHash():
+		return werr.Wrapf(ErrInvalidArgument, "invalid hash")
+	case !opts.ValidateSignature():
+		return werr.Wrapf(ErrInvalidArgument, "invalid signature")
 	}
-func (opts *Tx) ValidateHash() (valid bool) {
-	return bytes.Equal(opts.Hash, GetTxHash(
-		opts.ReceiverPublicKey, opts.Message, opts.Amount, opts.BlockId, opts.CreatedAt, opts.CreatedAtNs,
+	return nil
+}
+
+func (tx *Tx) ValidateBlockId() (valid bool) {
+	return tx.BlockId == (tx.CreatedAt/BlockSecsDiff)*BlockSecsDiff
+}
+func (tx *Tx) ValidateHash() (valid bool) {
+	return bytes.Equal(tx.Hash, GetTxHash(
+		tx.ReceiverPublicKey, tx.Message, tx.Amount, tx.BlockId, tx.CreatedAt, tx.CreatedAtNs,
 	))
 }
-func (opts *Tx) ValidateSignature() (valid bool) {
-	return ed25519.Verify(opts.SenderPublicKey, opts.Hash, opts.Signature)
+func (tx *Tx) ValidateSignature() (valid bool) {
+	return ed25519.Verify(tx.SenderPublicKey, tx.Hash, tx.Signature)
+}
+func (tx *Tx) Validate() (err error) {
+	if tx.ValidateBlockId() {
+		return werr.Wrapf(ErrInvalidArgument, "invalid block id")
+	} else if tx.ValidateHash() {
+		return werr.Wrapf(ErrInvalidArgument, "invalid hash")
+	} else if tx.ValidateSignature() {
+		return werr.Wrapf(ErrInvalidArgument, "invalid signature")
+	} else if ValidateBurningBool(tx) {
+		return werr.Wrapf(ErrInvalidArgument, "invalid burning")
+	}
+	return nil
 }
 
 // HashString uses base64.RawURLEncoding encoding
@@ -155,19 +174,19 @@ func (opts *NewTxOpts) SignatureString() string {
 }
 
 // HashString uses base64.RawURLEncoding encoding
-func (opts *Tx) HashString() string {
-	return base64.RawURLEncoding.EncodeToString(opts.Hash)
+func (tx *Tx) HashString() string {
+	return base64.RawURLEncoding.EncodeToString(tx.Hash)
 }
 
 // SignatureString uses base64.RawURLEncoding encoding
-func (opts *Tx) SignatureString() string {
-	return base64.RawURLEncoding.EncodeToString(opts.Signature)
+func (tx *Tx) SignatureString() string {
+	return base64.RawURLEncoding.EncodeToString(tx.Signature)
 }
 
 func (opts *NewTxOpts) ToJSON(byteEncodingStr string) ([]byte, error) {
 	encoding, err := GetEncoding(byteEncodingStr)
 	if err != nil {
-		return nil, werr.Wrapf(err, "error while trying to get byte->string encoding")
+		return nil, werr.Wrapf(err, "error while getting byte->string encoding")
 	}
 	data := &NewTxOptsJson{
 		Hash:              encoding.EncodeToString(opts.Hash),
@@ -184,36 +203,36 @@ func (opts *NewTxOpts) ToJSON(byteEncodingStr string) ([]byte, error) {
 	}
 	jsonBytes, err := json.Marshal(data)
 	if err != nil {
-		return nil, werr.Wrapf(err, "error while trying to marshal to json")
+		return nil, werr.Wrapf(err, "error while marshaling")
 	}
 	return jsonBytes, nil
 }
 
-func (opts *Tx) ToJSON(byteEncodingStr string) ([]byte, error) {
+func (tx *Tx) ToJSON(byteEncodingStr string) ([]byte, error) {
 	encoding, err := GetEncoding(byteEncodingStr)
 	if err != nil {
-		return nil, werr.Wrapf(err, "error while trying to get byte->string encoding")
+		return nil, werr.Wrapf(err, "error while getting byte->string encoding")
 	}
 	data := &TxJson{
-		Hash:              encoding.EncodeToString(opts.Hash),
-		BlockId:           opts.BlockId,
-		SenderPublicKey:   encoding.EncodeToString(opts.SenderPublicKey),
-		ReceiverPublicKey: encoding.EncodeToString(opts.ReceiverPublicKey),
-		IsReward:          opts.IsReward,
-		Amount:            opts.Amount,
-		AmountBurned:      opts.AmountBurned,
-		Message:           opts.Message,
-		Signature:         encoding.EncodeToString(opts.Signature),
-		CreatedAt:         opts.CreatedAt,
-		CreatedAtNs:       opts.CreatedAtNs,
-		AddedAt:           opts.AddedAt,
-		IsAdded:           opts.IsAdded,
+		Hash:              encoding.EncodeToString(tx.Hash),
+		BlockId:           tx.BlockId,
+		SenderPublicKey:   encoding.EncodeToString(tx.SenderPublicKey),
+		ReceiverPublicKey: encoding.EncodeToString(tx.ReceiverPublicKey),
+		IsReward:          tx.IsReward,
+		Amount:            tx.Amount,
+		AmountBurned:      tx.AmountBurned,
+		Message:           tx.Message,
+		Signature:         encoding.EncodeToString(tx.Signature),
+		CreatedAt:         tx.CreatedAt,
+		CreatedAtNs:       tx.CreatedAtNs,
+		AddedAt:           tx.AddedAt,
+		IsAdded:           tx.IsAdded,
 
 		ByteEncoding: byteEncodingStr,
 	}
 	jsonBytes, err := json.Marshal(data)
 	if err != nil {
-		return nil, werr.Wrapf(err, "error while trying to marshal to json")
+		return nil, werr.Wrapf(err, "error while marshaling")
 	}
 	return jsonBytes, nil
 }
@@ -229,19 +248,19 @@ func (opts *NewTxOptsJson) Process() (*NewTxOpts, error) {
 	}
 	encoding, err := GetEncoding(opts.ByteEncoding)
 	if err != nil {
-		return nil, werr.Wrapf(err, "error while trying to get byte->string encoding")
+		return nil, werr.Wrapf(err, "error while getting byte->string encoding")
 	}
 	if out.Hash, err = encoding.DecodeString(opts.Hash); err != nil {
-		return nil, werr.Wrapf(err, "error while trying to decode hash")
+		return nil, werr.Wrapf(err, "error while decoding hash")
 	}
 	if out.SenderPublicKey, err = encoding.DecodeString(opts.SenderPublicKey); err != nil {
-		return nil, werr.Wrapf(err, "error while trying to decode sender public key")
+		return nil, werr.Wrapf(err, "error while decoding sender public key")
 	}
 	if out.ReceiverPublicKey, err = encoding.DecodeString(opts.ReceiverPublicKey); err != nil {
-		return nil, werr.Wrapf(err, "error while trying to decode receiver public key")
+		return nil, werr.Wrapf(err, "error while decoding receiver public key")
 	}
 	if out.Signature, err = encoding.DecodeString(opts.Signature); err != nil {
-		return nil, werr.Wrapf(err, "error while trying to decode signature")
+		return nil, werr.Wrapf(err, "error while decoding signature")
 	}
 	return out, nil
 }
@@ -279,19 +298,19 @@ func (tx *TxJson) Process() (*Tx, error) {
 	}
 	encoding, err := GetEncoding(tx.ByteEncoding)
 	if err != nil {
-		return nil, werr.Wrapf(err, "error while trying to get byte->string encoding")
+		return nil, err
 	}
 	if out.Hash, err = encoding.DecodeString(tx.Hash); err != nil {
-		return nil, werr.Wrapf(err, "error while trying to decode hash")
+		return nil, werr.Wrapf(err, "error while decoding hash")
 	}
 	if out.SenderPublicKey, err = encoding.DecodeString(tx.SenderPublicKey); err != nil {
-		return nil, werr.Wrapf(err, "error while trying to decode sender public key")
+		return nil, werr.Wrapf(err, "error while decoding sender public key")
 	}
 	if out.ReceiverPublicKey, err = encoding.DecodeString(tx.ReceiverPublicKey); err != nil {
-		return nil, werr.Wrapf(err, "error while trying to decode receiver public key")
+		return nil, werr.Wrapf(err, "error while decoding receiver public key")
 	}
 	if out.Signature, err = encoding.DecodeString(tx.Signature); err != nil {
-		return nil, werr.Wrapf(err, "error while trying to decode signature")
+		return nil, werr.Wrapf(err, "error while decoding signature")
 	}
 	return out, nil
 }
@@ -299,14 +318,14 @@ func (tx *TxJson) Process() (*Tx, error) {
 func NewTxOptsFromJSON(marshaledData []byte) (opts *NewTxOpts, err error) {
 	data := &NewTxOptsJson{}
 	if err := json.Unmarshal(marshaledData, data); err != nil {
-		return nil, werr.Wrapf(err, "error while trying to unmarshal new transaction options")
+		return nil, werr.Wrapf(err, "error while unmarshaling")
 	}
 	return data.Process()
 }
 func NewTxOptsFromJsonReader(r io.Reader) (opts *NewTxOpts, err error) {
 	data := &NewTxOptsJson{}
 	if err := json.NewDecoder(r).Decode(&data); err != nil {
-		return nil, werr.Wrapf(err, "error while trying to unmarshal new transaction options")
+		return nil, werr.Wrapf(err, "error while unmarshaling")
 	}
 	return data.Process()
 }
@@ -314,14 +333,14 @@ func NewTxOptsFromJsonReader(r io.Reader) (opts *NewTxOpts, err error) {
 func TxFromJSON(marshaledData []byte) (opts *Tx, err error) {
 	data := &TxJson{}
 	if err := json.Unmarshal(marshaledData, data); err != nil {
-		return nil, werr.Wrapf(err, "error while trying to unmarshal new transaction options")
+		return nil, werr.Wrapf(err, "error while unmarshaling")
 	}
 	return data.Process()
 }
 func TxFromJsonReader(r io.Reader) (opts *Tx, err error) {
 	data := &TxJson{}
 	if err := json.NewDecoder(r).Decode(&data); err != nil {
-		return nil, werr.Wrapf(err, "error while trying to unmarshal new transaction options")
+		return nil, werr.Wrapf(err, "error while unmarshaling")
 	}
 	return data.Process()
 }

infra.docker-compose.yml

@@ -0,0 +1,8 @@
+services:
+  postgres:
+    image: postgres:latest
+    ports:
+      - "127.0.0.1:5432:5432"
+    volumes:
+      - ./pg_data:/var/lib/postgres
+    environment:

server/api/http/api.go

@@ -2,15 +2,47 @@ package http
 
 import (
 	"context"
+	"encoding/json"
+	"mic-wallet/common"
+	"mic-wallet/server/core"
 	"net/http"
 )
 
-func NewApi(ctx context.Context, baseRoute string) *http.ServeMux {
+type ApiDependencies struct {
+	*core.BlocksCreator
+}
+
+/*
+/               -- node info
+/txs            -- add/get txs
+/blocks         -- get/blocks
+/blocks/current -- get current block info
+*/
+
+func NewApi(ctx context.Context, d ApiDependencies, baseRoute string) *http.ServeMux {
 	if baseRoute == "" {
 		baseRoute = "/"
 	}
-
 	mux := http.NewServeMux()
 
+	/*
+
+	 */
+
+	mux.HandleFunc(baseRoute, func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/" {
+			w.WriteHeader(http.StatusNotFound)
+			return
+		}
+		if r.Method != http.MethodGet {
+			w.WriteHeader(http.StatusMethodNotAllowed)
+			return
+		}
+		data, _ := json.Marshal(common.NodeInfo{
+			NodeVersion: common.VersionNumberStr,
+		})
+		w.Write(data)
+		w.WriteHeader(http.StatusOK)
+	})
 	return mux
 }

server/api/http/transaction.go

@@ -3,20 +3,35 @@ package http
 import (
 	"context"
 	"encoding/json"
+	"errors"
+	"github.com/matchsystems/werr"
+	"log"
+	"mic-wallet/common"
+	"mic-wallet/server/core"
 	logicErr "mic-wallet/server/logic/err"
 	"net/http"
 )
 
-type NewTransactionReqBody struct {
-}
-
-func NewTransaction(w http.ResponseWriter, r *http.Request) *logicErr.Err {
-	req := &NewTransactionReqBody{}
-	if err := json.NewDecoder(r.Body).Decode(req); err != nil {
-	}
+func NewTransaction(ctx context.Context, w http.ResponseWriter, r *http.Request, d ApiDependencies) {
+	defer func() {
 		if err := r.Body.Close(); err != nil {
+			log.Printf("error closing request body: %s", err.Error())
 		}
-	return nil
+	}()
+	req := &common.NewTxOpts{}
+	if err := json.NewDecoder(r.Body).Decode(req); err != nil {
+		http.Error(w, "invalid request body", http.StatusBadRequest)
+		return
+	}
+	if err := d.WriteTx(req); err != nil {
+		if errors.Is(werr.UnwrapAll(err), core.ErrTxDuplicate) {
+			http.Error(w, "transaction already exists", http.StatusConflict)
+			return
+		}
+		w.WriteHeader(http.StatusInternalServerError)
+	}
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
 }
 
 func GetTransaction(w http.ResponseWriter, r *http.Request) *logicErr.Err {

server/core/block.go

@@ -2,25 +2,33 @@ package core
 
 import (
 	"crypto/sha512"
-	"fmt"
+	"encoding/binary"
+	"github.com/matchsystems/werr"
 	"mic-wallet/common"
+	"mic-wallet/server/repository/entities"
 	"sync"
 )
 
 type Block struct {
-	ID               int64
-	IgnoreSignatures map[string]struct{}
-	TXs              map[string]*common.NewTxOpts
-	Lock             *sync.RWMutex
+	Id       int64
 	PrevHash []byte
 	Hash     []byte
+	TXs      map[string]*common.NewTxOpts
+	// If there is some transactions added after block is finished
+	TXsLeftOver      map[string]*common.NewTxOpts
+	IgnoreSignatures map[string]struct{}
+	Lock             *sync.RWMutex
+	IsFinished       bool
 }
 
-func NewBlock(id int64, prevHash []byte) *Block {
+func NewBlock(id int64, prevHash []byte,
+	prevTxsLeftOver map[string]*common.NewTxOpts, txsLeftOver map[string]*common.NewTxOpts) *Block {
+
 	return &Block{
-		ID:               id,
+		Id:               id,
 		IgnoreSignatures: make(map[string]struct{}),
-		TXs:              make(map[string]*common.NewTxOpts),
+		TXs:              prevTxsLeftOver,
+		TXsLeftOver:      txsLeftOver,
 		Lock:             &sync.RWMutex{},
 		PrevHash:         prevHash,
 	}
@@ -28,25 +36,41 @@ func NewBlock(id int64, prevHash []byte) *Block {
 
 func (b *Block) AddTx(tx *common.NewTxOpts) error {
 	b.Lock.Lock()
-	hashStr := tx.HashString()
 	sigStr := tx.SignatureString()
+	hashStr := tx.HashString()
 	if _, ok := b.IgnoreSignatures[sigStr]; ok {
-		return fmt.Errorf("duplicate")
+		return werr.Wrapf(common.ErrEntityExists,
+			"transaction with signature %s already exists", sigStr)
 	}
+	if !b.IsFinished {
 		b.TXs[hashStr] = tx
+	} else {
+		b.TXsLeftOver[hashStr] = tx
+	}
 	b.Lock.Unlock()
 	return nil
 }
 
-func (b *Block) RemoveTx(hash string) {}
-
-func (b *Block) CalcHash() []byte {
+func (b *Block) Finish() ([]byte, error) {
 	hash := sha512.New()
+	if err := binary.Write(hash, binary.BigEndian, b.Id); err != nil {
+		return nil, werr.Wrapf(err, "failed to write block id into hash buffer for block %d", b.Id)
+	}
 	b.Lock.Lock()
 	hash.Write(b.PrevHash)
 	for _, tx := range b.TXs {
 		hash.Write(tx.Hash)
 	}
+	b.IsFinished = true
+	b.Lock.Unlock()
 	b.Hash = hash.Sum(nil)
-	return b.Hash
+	return b.Hash, nil
+}
+
+func (b *Block) ToRepoEntity() *entities.Block {
+	return &entities.Block{
+		Id:       b.Id,
+		Hash:     b.Hash,
+		PrevHash: b.PrevHash,
+	}
 }

server/core/blocks_commiter.go

@@ -19,8 +19,8 @@ type IBlocksCommiter interface {
 type BlocksCommiter struct {
 	BlocksQueue  []*Block
 	Lock         *sync.RWMutex
-	CountLim     int32
-	CountBusy    int32
+	CountLim     int
+	CountBusy    int
 	TaskDeadline time.Duration
 	ErrChan      chan error
 
@@ -31,16 +31,19 @@ func NewBlocksCommiter(repo *repository.Repository, errChan chan error, workersC
 	return &BlocksCommiter{
 		BlocksQueue:  make([]*Block, 0),
 		Lock:         &sync.RWMutex{},
-		CountLim:     0,
+		CountLim:     workersCountLim,
 		CountBusy:    0,
 		TaskDeadline: 0,
-		ErrChan:      make(chan error, workersCountLim),
+		ErrChan:      errChan,
 		CommitBlockFunc: func(ctx context.Context, block *Block) error {
 			return CommitBlock(ctx, repo, block)
 		},
 	}
 }
 
+// execute executes commiting block with deadline and cancelable by the context
+// provided when calling CommitBlock.
+// all the errors from it (including context) are sent to BlocksCommiter.ErrChan
 func (bc *BlocksCommiter) execute(ctx context.Context, block *Block) {
 	if bc.TaskDeadline > 0 {
 		var cancel context.CancelFunc
@@ -55,9 +58,9 @@ func (bc *BlocksCommiter) execute(ctx context.Context, block *Block) {
 	}()
 	select {
 	case <-ctx.Done():
-		errChan <- werr.Wrapf(ctx.Err(), "ctx error while commiting block %d", block.ID)
+		bc.ErrChan <- werr.Wrapf(ctx.Err(), "ctx error while commiting block %d", block.Id)
 	case err := <-errChan:
-		bc.ErrChan <- werr.Wrapf(err, "error while commiting block %d", block.ID)
+		bc.ErrChan <- werr.Wrapf(err, "error while commiting block %d", block.Id)
 	}
 }
 

server/core/blocks_commiter_test.go

@@ -0,0 +1,7 @@
+package core
+
+import "testing"
+
+func TestBlocksCommiter_CommitBlock(t *testing.T) {
+	// TODO
+}

server/core/blocks_creator.go

@@ -8,6 +8,9 @@ import (
 	"time"
 )
 
+var ErrOutOfDateBlockId = errors.New("")
+var ErrBlockIdDoesntExist = errors.New("")
+
 type IBlocksCreator interface {
 	Run(ctx context.Context) error
 	WriteTx(opts *common.NewTxOpts) error
@@ -16,8 +19,10 @@ type IBlocksCreator interface {
 	GetTxs() []*common.NewTxOpts
 }
 
+// BlocksCreator creates and rotates new Blocks and pushed them to the commiter
 type BlocksCreator struct {
 	blocks        map[int64]*Block
+	txsLeftOver   map[string]*common.NewTxOpts
 	commiter      IBlocksCommiter
 	prevBlockHash []byte
 }
@@ -25,32 +30,58 @@ type BlocksCreator struct {
 func NewBlocksCreator(commiter IBlocksCommiter) *BlocksCreator {
 	return &BlocksCreator{
 		blocks:      make(map[int64]*Block),
+		txsLeftOver: make(map[string]*common.NewTxOpts),
 		commiter:    commiter,
 	}
 }
 
-func (bc *BlocksCreator) Run(ctx context.Context) error {
+func (bc *BlocksCreator) Run(ctx context.Context) (err error) {
 	var blockID int64
+	var prevLeftOver map[string]*common.NewTxOpts
 	for {
 		blockID = common.GetBlockId(time.Now())
-		if oldBlock, ok := bc.blocks[blockID-100]; ok { // Commit and delete old block
-			bc.prevBlockHash = oldBlock.CalcHash()
-			bc.commiter.CommitBlock(ctx, oldBlock)
-			delete(bc.blocks, blockID-100)
+		if oldBlock, ok := bc.blocks[blockID-common.BlockSecsDiff]; ok { // Commit and delete old block
+			// we need to know previous hash for new block.
+			// new transactions while oldBlock.Finish is executing will
+			// end up in leftOver so they will be parts of the next block
+			if bc.prevBlockHash, err = oldBlock.Finish(); err != nil {
+				return nil
 			}
-		bc.blocks[blockID] = NewBlock(blockID, bc.prevBlockHash)
-		time.Sleep(time.Until(time.Unix(blockID+100, 0)))
+			go bc.commiter.CommitBlock(ctx, oldBlock) // may take a while
+			delete(bc.blocks, blockID-common.BlockSecsDiff)
+		}
+		// prevLeftOver becomes new block's transactions
+		// so there is no "lost" transactions
+		prevLeftOver = bc.txsLeftOver
+		// and also now we need to make new leftOver
+		bc.txsLeftOver = make(map[string]*common.NewTxOpts)
+		bc.blocks[blockID] = NewBlock(blockID, bc.prevBlockHash, prevLeftOver, bc.txsLeftOver)
+		// Waiting for the next block
+		time.Sleep(time.Until(time.Unix(blockID+common.BlockSecsDiff, 0)))
 	}
 }
 
+// WriteTx validates transaction and writes it into the current block
+// if transaction is valid
 func (bc *BlocksCreator) WriteTx(opts *common.NewTxOpts) error {
+	// validating may take some time, so to don't write into
+	if err := opts.Validate(); err != nil {
+		return werr.Wrapf(err,
+			"error validating transaction %s", opts.HashString())
+	}
 	currentBlockID := common.GetBlockId(time.Now())
 	if currentBlockID < opts.BlockId {
-		return errors.New("block with such id wasn't created yet. " +
-			"Ensure that you generate block IDs in UTC timezone")
+		return werr.Wrapf(common.ErrEntityNotFound, "block id %d does not exist", currentBlockID)
 	} else if currentBlockID > opts.BlockId {
-		return errors.New("block id is out of date")
+		return werr.Wrapf(common.ErrEntityOutdated, "block id %d is out of date", currentBlockID)
 	}
-	return werr.Wrapf(bc.blocks[currentBlockID].AddTx(opts),
+	block, ok := bc.blocks[currentBlockID]
+	if !ok {
+		return werr.Wrapf(common.ErrEntityNotFound, "block id %d does not exist", currentBlockID)
+	}
+	if err := block.AddTx(opts); err != nil {
+		return werr.Wrapf(err,
 			"error adding transaction to block %d", currentBlockID)
 	}
+	return nil
+}

server/core/commit_block.go

@@ -2,9 +2,46 @@ package core
 
 import (
 	"context"
+	"github.com/matchsystems/werr"
+	"mic-wallet/common"
 	"mic-wallet/server/repository"
+	"mic-wallet/server/repository/entities"
 )
 
-func CommitBlock(ctx context.Context, repo *repository.Repository, block *Block) error {
-	return nil
+func NewTxOptsToRepoEntity(opts *common.NewTxOpts) *entities.NewTransactionOpts {
+	return &entities.NewTransactionOpts{
+		Hash:              opts.Hash,
+		BlockId:           opts.BlockId,
+		SenderPublicKey:   opts.SenderPublicKey,
+		ReceiverPublicKey: opts.ReceiverPublicKey,
+		IsReward:          opts.IsReward,
+		Amount:            opts.Amount,
+		AmountBurned:      common.CalcBurning(opts.Amount),
+		Message:           opts.Message,
+		Signature:         opts.Signature,
+		CreatedAt:         opts.CreatedAt,
+		CreatedAtNs:       opts.CreatedAtNs,
+	}
+}
+
+func CommitBlock(ctx context.Context, repo *repository.Repository, block *Block) (err error) {
+	// If micw will be decentralized
+	// this function will be sending blocks to other nodes
+	// and then there will be block-fetcher to see which blocks were accepted to the network
+
+	if err = repo.AddBLock(ctx, &entities.Block{
+		Id:       block.Id,
+		Hash:     block.Hash,
+		PrevHash: block.PrevHash,
+	}); err != nil {
+		return werr.Wrapf(err, "failed to commit block")
+	}
+
+	repoTxOpts := make([]*entities.NewTransactionOpts, len(block.TXs))
+	var i int
+	for _, tx := range block.TXs {
+		repoTxOpts[i] = NewTxOptsToRepoEntity(tx)
+		i++
+	}
+	return werr.Wrapf(repo.AddTransactions(ctx, repoTxOpts), "failed to commit transactions")
 }

server/migrations/0.up.sql

@@ -11,7 +11,6 @@ CREATE TABLE blocks (
     hash        BYTEA UNIQUE,
     -- NULL only on the first block
     prev_hash   BYTEA UNIQUE,
-    finished_at TIMESTAMP,
 )
 
 CREATE TABLE IF NOT EXISTS transactions (

server/repository/entities/entities.go

@@ -9,8 +9,7 @@ type (
 		Id           int64         `db:"id"`
 		Hash         []byte        `db:"hash"`
 		PrevHash     []byte        `db:"prev_hash"`
-		StartedAt    time.Time     `db:"started_at"`
-		FinishedAt   *time.Time    `db:"finished_at"`
+		FinishedAt   time.Time     `db:"finished_at"`
 		Transactions []Transaction `db:"transactions"`
 	}
 
@@ -18,23 +17,8 @@ type (
 		Id         int64      `db:"id"`
 		Hash       []byte     `db:"hash"`
 		PrevHash   []byte     `db:"prev_hash"`
-		StartedAt  time.Time  `db:"started_at"`
 		FinishedAt *time.Time `db:"finished_at"`
 	}
-
-	NewBlockOpts struct {
-		Id         int64      `db:"id"`
-		Hash       []byte     `db:"hash"`      // May be nil
-		PrevHash   []byte     `db:"prev_hash"` // May be nil
-		StartedAt  time.Time  `db:"started_at"`
-		FinishedAt *time.Time `db:"finished_at"` // May be nil
-	}
-
-	BlockFinishedOpts struct {
-		Id         int64     `db:"id"`
-		Hash       []byte    `db:"hash"`
-		FinishedAt time.Time `db:"finished_at"`
-	}
 )
 
 type (
@@ -63,7 +47,7 @@ type (
 		AmountBurned      float64 `db:"amount_burned"`
 		Message           string  `db:"message"`
 		Signature         []byte  `db:"signature"`
-		CreatedAt         time.Time `db:"created_at"`
+		CreatedAt         int64   `db:"created_at"`
 		CreatedAtNs       int64   `db:"created_at_ns"`
 	}
 )

server/repository/repo.go

@@ -7,25 +7,28 @@ import (
 )
 
 type IBlocksRepository interface {
-	NewBLock(ctx context.Context, opts e.NewBlockOpts) (blockID int64, err error)
-	FinishBlock(ctx context.Context, opts e.BlockFinishedOpts) (err error)
+	AddBLock(ctx context.Context, opts *e.Block) (err error)
+
 	GetBlock(ctx context.Context, id int64) (block *e.Block, err error)
 	GetBlockByHash(ctx context.Context, hash string) (block *e.Block, err error)
-	GetLastFinishedBlock(ctx context.Context) (block *e.Block, err error)
+
+	GetBlockWithTxs(ctx context.Context, id int64) (block *e.BlockWithTransactions, err error)
+	GetBlockWithTxsByHash(ctx context.Context, hash string) (block *e.BlockWithTransactions, err error)
 }
 
 type ITransactionsRepository interface {
-	GetLastTransactionHash(ctx context.Context) ([]byte, error)
-	AddTransaction(ctx context.Context, opts e.NewTransactionOpts) (transaction *e.Transaction, err error)
-	GetTransaction(ctx context.Context, txID int64) (tx e.Transaction, err error)
+	AddTransaction(ctx context.Context, opts *e.NewTransactionOpts) (transaction *e.Transaction, err error)
+	AddTransactions(ctx context.Context, opts []*e.NewTransactionOpts) (err error)
+
+	GetTransaction(ctx context.Context, hash string) (tx *e.Transaction, err error)
 	GetUserIncomingTransactions(
-		ctx context.Context, userPubKey string, orderAsc bool, limit int, offset int) ([]e.Transaction, error)
+		ctx context.Context, userPubKey string, orderAsc bool, limit int, offset int) ([]*e.Transaction, error)
 	GetUserOutcomingTransactions(
-		ctx context.Context, userPubKey string, orderAsc bool, limit int, offset int) ([]e.Transaction, error)
+		ctx context.Context, userPubKey string, orderAsc bool, limit int, offset int) ([]*e.Transaction, error)
 	GetUserTransactions(
-		ctx context.Context, userPubKey string, orderAsc bool, limit int, offset int) ([]e.Transaction, error)
+		ctx context.Context, userPubKey string, orderAsc bool, limit int, offset int) ([]*e.Transaction, error)
 	GetTransactions(
-		ctx context.Context, orderAsc bool, limit int, offset int) ([]e.Transaction, error)
+		ctx context.Context, orderAsc bool, limit int, offset int) ([]*e.Transaction, error)
 }
 
 type Repository struct {

server/run.go

@@ -3,34 +3,36 @@ package server
 import (
 	"context"
 	"fmt"
-	commonUtils "git.mic.pp.ua/anderson/nettools/common"
 	"net/http"
 )
 
 func (s *Server) Run(ctx context.Context) error {
-	tasks := make([]commonUtils.Task, 0)
+	s.ErrChan = make(chan error)
+	defer close(s.ErrChan)
+
+	tasks := make([]serverTask, 0)
 	var mux *http.ServeMux
 	if s.HttpListener != nil || s.HttpsListener != nil {
 		mux = http.NewServeMux()
 	}
 
 	if s.HttpListener != nil {
-		tasks = append(tasks, func(ctx context.Context) error {
-			return http.Serve(s.HttpListener, mux)
+		tasks = append(tasks, func() error {
+			return s.RunHttp(mux)
 		})
 	}
 	if s.HttpsListener != nil {
-		tasks = append(tasks, func(ctx context.Context) error {
-			return http.ServeTLS(s.HttpsListener, mux, s.Cfg.TlsCfg.Cert, s.Cfg.TlsCfg.Key)
+		tasks = append(tasks, func() error {
+			return s.RunHttps(mux)
 		})
 	}
 	if s.GrpcListener != nil {
-		tasks = append(tasks, func(ctx context.Context) error {
-			return nil
+		tasks = append(tasks, func() error {
+			return s.RunGrpc()
 		})
 	}
 
-	return commonUtils.ExecTasks(ctx, 0, tasks)
+	return s.execTasks(ctx, tasks)
 }
 
 func (s *Server) RunHttp(mux http.Handler) error {

server/server.go

@@ -2,38 +2,45 @@ package server
 
 import (
 	"context"
-	commonUtils "git.mic.pp.ua/anderson/nettools/common"
 	"github.com/jackc/pgx/v5/pgxpool"
 	"mic-wallet/server/config"
+	"mic-wallet/server/core"
 	"mic-wallet/server/repository"
 	"net"
 	"net/http"
 )
 
+type serverTask func() error
+
 type Server struct {
 	Cfg            *config.Processed
 	DB             *pgxpool.Pool
+	Repo           *repository.Repository
+	BlocksCommiter *core.BlocksCommiter
+	BlocksCreator  *core.BlocksCreator
 	HttpListener   net.Listener
 	HttpsListener  net.Listener
 	GrpcListener   net.Listener
 	Mux            *http.ServeMux
-	Repo          *repository.Repository
+	ErrChan        chan error
 }
 
 func New(cfg *config.Processed) *Server {
-	return &Server{Cfg: cfg}
+	return &Server{
+		Cfg:     cfg,
+		ErrChan: make(chan error),
+	}
 }
 
-func (s *Server) execTasks(ctx context.Context, tasks []commonUtils.Task) error {
-	errChan := make(chan error)
+func (s *Server) execTasks(ctx context.Context, tasks []serverTask) error {
 	for _, task := range tasks {
 		go func() {
-			errChan <- task(ctx)
+			s.ErrChan <- task()
 		}()
 	}
 	for {
 		select {
-		case err := <-errChan:
+		case err := <-s.ErrChan:
 			if err != nil {
 				return err
 			}

server/setup.go

@@ -11,16 +11,15 @@ import (
 	_ "github.com/jackc/pgx/v5/stdlib"
 	"github.com/matchsystems/werr"
 	"log"
+	"mic-wallet/server/core"
 	"mic-wallet/server/repository"
 	"net"
 	"net/http"
+	"runtime"
 	"time"
 )
 
 func (s *Server) Setup(ctx context.Context) error {
-	// ================================
-	// Set up the transactions pipeline
-
 	// ===================
 	// Setting up database
 
@@ -67,7 +66,13 @@ func (s *Server) Setup(ctx context.Context) error {
 	// Internals initialization
 
 	s.Repo = repository.NewRepository(s.DB)
-	// TODO:
+
+	commiterWorkersLim := runtime.NumCPU() - 1
+	if commiterWorkersLim < 1 {
+		commiterWorkersLim = 1
+	}
+	s.BlocksCommiter = core.NewBlocksCommiter(s.Repo, s.ErrChan, commiterWorkersLim)
+	s.BlocksCreator = core.NewBlocksCreator(s.BlocksCommiter)
 
 	// ======================
 	// Creating net listeners
@@ -79,7 +84,7 @@ func (s *Server) Setup(ctx context.Context) error {
 		addr := fmt.Sprintf("%s:%d", s.Cfg.Addr, s.Cfg.HttpPort)
 		s.HttpListener, err = net.Listen("tcp", addr)
 		if err != nil {
-			return werr.Wrapf(err, "failed to listen http_api_entities on address %s", addr)
+			return werr.Wrapf(err, "failed to listen http on address %s", addr)
 		}
 	}
 	if s.Cfg.HttpsPort > 0 {