[NOD-303] Implement get transaction by id for api server (#391)

* [NOD-303] Implement get transaction by id for api server

* [NOD-303] Make routeParamTxID a constant

* [NOD-303] Change database is not current error.

* [NOD-303] Add ID to TransactionInput and TransactionOutput models

* [NOD-303] Change transactions_outputs table name to transaction_outputs and transactions_inputs to transaction_inputs

* [NOD-303] Add json annotations to transaction response types

* [NOD-303] Split server package

* [NOD-303] Add GetTransactionByHashHandler

* [NOD-303] Add comments to exported functions and variables

* [NOD-303] Put response types in a separate file

* [NOD-303] Rename functions

apiserver/config/config.go

@@ -1,4 +1,4 @@
-package main
+package config
 
 import (
 	"errors"
@@ -20,23 +20,26 @@ var (
 	defaultHTTPListen = "0.0.0.0:8080"
 )
 
-type config struct {
+// Config defines the configuration options for the API server.
+type Config struct {
 	LogDir      string `long:"logdir" description:"Directory to log output."`
 	RPCUser     string `short:"u" long:"rpcuser" description:"RPC username" required:"true"`
 	RPCPassword string `short:"P" long:"rpcpass" default-mask:"-" description:"RPC password" required:"true"`
 	RPCServer   string `short:"s" long:"rpcserver" description:"RPC server to connect to" required:"true"`
 	RPCCert     string `short:"c" long:"rpccert" description:"RPC server certificate chain for validation"`
 	DisableTLS  bool   `long:"notls" description:"Disable TLS"`
-	DBHost      string `long:"dbhost" description:"Database host"`
+	DBAddress   string `long:"dbaddress" description:"Database address"`
 	DBUser      string `long:"dbuser" description:"Database user" required:"true"`
 	DBPassword  string `long:"dbpass" description:"Database password" required:"true"`
+	DBName      string `long:"dbname" description:"Database name" required:"true"`
 	HTTPListen  string `long:"listen" description:"HTTP address to listen on (default: 0.0.0.0:8080)"`
 }
 
-func parseConfig() (*config, error) {
+// Parse parses the CLI arguments and returns a config struct.
-	cfg := &config{
+func Parse() (*Config, error) {
+	cfg := &Config{
 		LogDir:     defaultLogDir,
-		DBHost:     defaultDBAddr,
+		DBAddress:  defaultDBAddr,
 		HTTPListen: defaultHTTPListen,
 	}
 	parser := flags.NewParser(cfg, flags.PrintErrors|flags.HelpFlag)

apiserver/connect.go

@@ -2,11 +2,12 @@ package main
 
 import (
 	"fmt"
+	"github.com/daglabs/btcd/apiserver/config"
 	"github.com/daglabs/btcd/rpcclient"
 	"io/ioutil"
 )
 
-func connectToServer(cfg *config) (*apiServerClient, error) {
+func connectToServer(cfg *config.Config) (*apiServerClient, error) {
 	var cert []byte
 	if !cfg.DisableTLS {
 		var err error

apiserver/controllers/responsetypes.go

@@ -0,0 +1,69 @@
+package controllers
+
+import (
+	"encoding/hex"
+	"github.com/daglabs/btcd/apiserver/models"
+)
+
+type transactionResponse struct {
+	TransactionHash         string                       `json:"transactionHash"`
+	TransactionID           string                       `json:"transactionId"`
+	AcceptingBlockHash      string                       `json:"acceptingBlockHash,omitempty"`
+	AcceptingBlockBlueScore uint64                       `json:"acceptingBlockBlueScore,omitempty"`
+	SubnetworkID            string                       `json:"subnetworkId"`
+	LockTime                uint64                       `json:"lockTime"`
+	Gas                     uint64                       `json:"gas,omitempty"`
+	PayloadHash             string                       `json:"payloadHash,omitempty"`
+	Payload                 string                       `json:"payload,omitempty"`
+	Inputs                  []*transactionInputResponse  `json:"inputs"`
+	Outputs                 []*transactionOutputResponse `json:"outputs"`
+	Mass                    uint64                       `json:"mass"`
+}
+
+type transactionOutputResponse struct {
+	TransactionID string `json:"transactionId,omitempty"`
+	Value         uint64 `json:"value"`
+	PkScript      string `json:"pkScript"`
+	Address       string `json:"address"`
+}
+
+type transactionInputResponse struct {
+	TransactionID                  string `json:"transactionId,omitempty"`
+	PreviousTransactionID          string `json:"previousTransactionId"`
+	PreviousTransactionOutputIndex uint32 `json:"previousTransactionOutputIndex"`
+	SignatureScript                string `json:"signatureScript"`
+	Sequence                       uint64 `json:"sequence"`
+}
+
+func convertTxModelToTxResponse(tx *models.Transaction) *transactionResponse {
+	txRes := &transactionResponse{
+		TransactionHash:         tx.TransactionHash,
+		TransactionID:           tx.TransactionID,
+		AcceptingBlockHash:      tx.AcceptingBlock.BlockHash,
+		AcceptingBlockBlueScore: tx.AcceptingBlock.BlueScore,
+		SubnetworkID:            tx.Subnetwork.SubnetworkID,
+		LockTime:                tx.LockTime,
+		Gas:                     tx.Gas,
+		PayloadHash:             tx.PayloadHash,
+		Payload:                 hex.EncodeToString(tx.Payload),
+		Inputs:                  make([]*transactionInputResponse, len(tx.TransactionOutputs)),
+		Outputs:                 make([]*transactionOutputResponse, len(tx.TransactionInputs)),
+		Mass:                    tx.Mass,
+	}
+	for i, txOut := range tx.TransactionOutputs {
+		txRes.Outputs[i] = &transactionOutputResponse{
+			Value:    txOut.Value,
+			PkScript: hex.EncodeToString(txOut.PkScript),
+			Address:  "", // TODO: Fill it when there's an addrindex in the DB.
+		}
+	}
+	for i, txIn := range tx.TransactionInputs {
+		txRes.Inputs[i] = &transactionInputResponse{
+			PreviousTransactionID:          txIn.TransactionOutput.Transaction.TransactionID,
+			PreviousTransactionOutputIndex: txIn.TransactionOutput.Index,
+			SignatureScript:                hex.EncodeToString(txIn.SignatureScript),
+			Sequence:                       txIn.Sequence,
+		}
+	}
+	return txRes
+}

apiserver/controllers/transaction.go

@@ -0,0 +1,46 @@
+package controllers
+
+import (
+	"fmt"
+	"github.com/daglabs/btcd/apiserver/database"
+	"github.com/daglabs/btcd/apiserver/models"
+	"github.com/daglabs/btcd/apiserver/utils"
+	"github.com/daglabs/btcd/util/daghash"
+	"github.com/jinzhu/gorm"
+	"net/http"
+)
+
+// GetTransactionByIDHandler returns a transaction by a given transaction ID.
+func GetTransactionByIDHandler(txID string) (interface{}, *utils.HandlerError) {
+	if len(txID) != daghash.TxIDSize*2 {
+		return nil, utils.NewHandlerError(http.StatusUnprocessableEntity, fmt.Sprintf("The given txid is not a hex-encoded %d-byte hash.", daghash.TxIDSize))
+	}
+	tx := &models.Transaction{}
+	db := database.DB.Where("transaction_id = ?", txID)
+	addTxPreloadedFields(db).First(&tx)
+	if tx.ID == 0 {
+		return nil, utils.NewHandlerError(http.StatusNotFound, "No transaction with the given txid was found.")
+	}
+	return convertTxModelToTxResponse(tx), nil
+}
+
+// GetTransactionByHashHandler returns a transaction by a given transaction hash.
+func GetTransactionByHashHandler(txHash string) (interface{}, *utils.HandlerError) {
+	if len(txHash) != daghash.HashSize*2 {
+		return nil, utils.NewHandlerError(http.StatusUnprocessableEntity, fmt.Sprintf("The given txhash is not a hex-encoded %d-byte hash.", daghash.HashSize))
+	}
+	tx := &models.Transaction{}
+	db := database.DB.Where("transaction_hash = ?", txHash)
+	addTxPreloadedFields(db).First(&tx)
+	if tx.ID == 0 {
+		return nil, utils.NewHandlerError(http.StatusNotFound, "No transaction with the given txhash was found.")
+	}
+	return convertTxModelToTxResponse(tx), nil
+}
+
+func addTxPreloadedFields(db *gorm.DB) *gorm.DB {
+	return db.Preload("AcceptingBlock").
+		Preload("Subnetwork").
+		Preload("TransactionOutputs").
+		Preload("TransactionInputs.TransactionOutput.Transaction")
+}

apiserver/database/database.go

@@ -0,0 +1,74 @@
+package database
+
+import (
+	"fmt"
+	"github.com/daglabs/btcd/apiserver/config"
+	"github.com/golang-migrate/migrate/v4/source"
+	"github.com/jinzhu/gorm"
+	"os"
+
+	"github.com/golang-migrate/migrate/v4"
+)
+
+// DB is the API server database.
+var DB *gorm.DB
+
+// Connect connects to the database mentioned in
+// config variable.
+func Connect(cfg *config.Config) error {
+	connectionString := buildConnectionString(cfg)
+	isCurrent, err := isCurrent(connectionString)
+	if err != nil {
+		return fmt.Errorf("Error checking whether the database is current: %s", err)
+	}
+	if !isCurrent {
+		return fmt.Errorf("Database is not current. Please migrate" +
+			" the database and start again.")
+	}
+
+	DB, err = gorm.Open("mysql", connectionString)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func buildConnectionString(cfg *config.Config) string {
+	return fmt.Sprintf("%s:%s@tcp(%s)/%s?charset=utf8&parseTime=True",
+		cfg.DBUser, cfg.DBPassword, cfg.DBAddress, cfg.DBName)
+}
+
+// isCurrent resolves whether the database is on the latest
+// version of the schema.
+func isCurrent(connectionString string) (bool, error) {
+	driver, err := source.Open("file://migrations")
+	if err != nil {
+		return false, err
+	}
+	migrator, err := migrate.NewWithSourceInstance(
+		"migrations", driver, "mysql://"+connectionString)
+	if err != nil {
+		return false, err
+	}
+
+	// Get the current version
+	version, isDirty, err := migrator.Version()
+	if err == migrate.ErrNilVersion {
+		return false, nil
+	}
+	if err != nil {
+		return false, err
+	}
+	if isDirty {
+		return false, fmt.Errorf("Database is dirty")
+	}
+
+	// The database is current if Next returns ErrNotExist
+	_, err = driver.Next(version)
+	if pathErr, ok := err.(*os.PathError); ok {
+		if pathErr.Err == os.ErrNotExist {
+			return true, nil
+		}
+	}
+	return false, err
+}

apiserver/db/migrations/000007_create_transactions_outputs_table.down.sql

@@ -1 +0,0 @@
-DROP TABLE `transactions_outputs`;

apiserver/db/migrations/000008_create_transactions_inputs_table.down.sql

@@ -1 +0,0 @@
-DROP TABLE `transactions_inputs`;

apiserver/main.go

@@ -2,20 +2,36 @@ package main
 
 import (
 	"fmt"
+	"github.com/daglabs/btcd/apiserver/config"
+	"github.com/daglabs/btcd/apiserver/database"
 	"github.com/daglabs/btcd/apiserver/server"
 	"github.com/daglabs/btcd/logger"
 	"github.com/daglabs/btcd/signal"
 	"github.com/daglabs/btcd/util/panics"
+	_ "github.com/golang-migrate/migrate/v4/database/mysql"
+	_ "github.com/golang-migrate/migrate/v4/source/file"
+	_ "github.com/jinzhu/gorm/dialects/mysql"
 )
 
 func main() {
 	defer panics.HandlePanic(log, logger.BackendLog)
 
-	cfg, err := parseConfig()
+	cfg, err := config.Parse()
 	if err != nil {
 		panic(fmt.Errorf("Error parsing command-line arguments: %s", err))
 	}
 
+	err = database.Connect(cfg)
+	if err != nil {
+		panic(fmt.Errorf("Error connecting to database: %s", err))
+	}
+	defer func() {
+		err := database.DB.Close()
+		if err != nil {
+			panic(fmt.Errorf("Error closing the database: %s", err))
+		}
+	}()
+
 	client, err := connectToServer(cfg)
 	if err != nil {
 		panic(fmt.Errorf("Error connecting to servers: %s", err))

apiserver/migrations/000001_create_blocks_table.up.sql

@@ -1,17 +1,18 @@
 CREATE TABLE `blocks`
 (
     `id`                      BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
-    `block_hash`              CHAR(64)     NOT NULL,
+    `block_hash`              CHAR(64)        NOT NULL,
     `accepting_block_id`      BIGINT UNSIGNED NULL,
     `version`                 INT             NOT NULL,
-    `hash_merkle_root`        CHAR(64)     NOT NULL,
+    `hash_merkle_root`        CHAR(64)        NOT NULL,
-    `accepted_id_merkle_root` CHAR(64)     NOT NULL,
+    `accepted_id_merkle_root` CHAR(64)        NOT NULL,
-    `utxo_commitment`         CHAR(64)     NOT NULL,
+    `utxo_commitment`         CHAR(64)        NOT NULL,
     `timestamp`               DATETIME        NOT NULL,
     `bits`                    INT UNSIGNED    NOT NULL,
     `nonce`                   BIGINT UNSIGNED NOT NULL,
     `blue_score`              BIGINT UNSIGNED NOT NULL,
     `is_chain_block`          TINYINT         NOT NULL,
+    `mass`                    BIGINT          NOT NULL,
     PRIMARY KEY (`id`),
     UNIQUE INDEX `idx_blocks_block_hash` (`block_hash`),
     INDEX `idx_blocks_timestamp` (`timestamp`),

apiserver/migrations/000005_create_transactions_table.up.sql

@@ -9,6 +9,7 @@ CREATE TABLE `transactions`
     `gas`              BIGINT UNSIGNED NOT NULL,
     `payload_hash`     CHAR(64)     NOT NULL,
     `payload`          BLOB            NOT NULL,
+    `mass`          BIGINT            NOT NULL,
     PRIMARY KEY (`id`),
     UNIQUE INDEX `idx_transactions_transaction_hash` (`transaction_hash`),
     INDEX `idx_transactions_transaction_id` (`transaction_id`),

apiserver/migrations/000007_create_transaction_outputs_table.down.sql

@@ -0,0 +1 @@
+DROP TABLE `transaction_outputs`;

apiserver/migrations/000007_create_transaction_outputs_table.up.sql

@@ -1,4 +1,4 @@
-CREATE TABLE `transactions_outputs`
+CREATE TABLE `transaction_outputs`
 (
     `id`                BIGINT UNSIGNED NOT NULL,
     `transaction_id`    BIGINT UNSIGNED NOT NULL,

apiserver/migrations/000008_create_transaction_inputs_table.down.sql

@@ -0,0 +1 @@
+DROP TABLE `transaction_inputs`;

apiserver/migrations/000008_create_transaction_inputs_table.up.sql

@@ -1,4 +1,4 @@
-CREATE TABLE `transactions_inputs`
+CREATE TABLE `transaction_inputs`
 (
     `id`                    BIGINT UNSIGNED NOT NULL,
     `transaction_id`        BIGINT UNSIGNED NULL,

apiserver/models/models.go

@@ -19,6 +19,7 @@ type Block struct {
 	Nonce                uint64
 	BlueScore            uint64
 	IsChainBlock         bool
+	Mass                 uint64
 	ParentBlocks         []Block `gorm:"many2many:parent_blocks;"`
 }
 
@@ -40,22 +41,26 @@ type RawBlock struct {
 // Subnetwork is the gorm model for the 'subnetworks' table
 type Subnetwork struct {
 	ID           uint64 `gorm:"primary_key"`
-	SubnetworkID []byte
+	SubnetworkID string
 }
 
 // Transaction is the gorm model for the 'transactions' table
 type Transaction struct {
-	ID               uint64 `gorm:"primary_key"`
+	ID                 uint64 `gorm:"primary_key"`
-	AcceptingBlockID uint64
+	AcceptingBlockID   uint64
-	AcceptingBlock   Block
+	AcceptingBlock     Block
-	TransactionHash  string
+	TransactionHash    string
-	TransactionID    string
+	TransactionID      string
-	LockTime         uint64
+	LockTime           uint64
-	SubnetworkID     uint64
+	SubnetworkID       uint64
-	Gas              uint64
+	Subnetwork         Subnetwork
-	PayloadHash      string
+	Gas                uint64
-	Payload          []byte
+	PayloadHash        string
-	Blocks           []Block `gorm:"many2many:transactions_to_blocks;"`
+	Payload            []byte
+	Mass               uint64
+	Blocks             []Block `gorm:"many2many:transactions_to_blocks;"`
+	TransactionOutputs []TransactionOutput
+	TransactionInputs  []TransactionInput
 }
 
 // TransactionBlock is the gorm model for the 'transactions_to_blocks' table
@@ -75,6 +80,7 @@ func (TransactionBlock) TableName() string {
 
 // TransactionOutput is the gorm model for the 'transaction_outputs' table
 type TransactionOutput struct {
+	ID            uint64 `gorm:"primary_key"`
 	TransactionID uint64
 	Transaction   Transaction
 	Index         uint32
@@ -84,6 +90,7 @@ type TransactionOutput struct {
 
 // TransactionInput is the gorm model for the 'transaction_inputs' table
 type TransactionInput struct {
+	ID                  uint64 `gorm:"primary_key"`
 	TransactionID       uint64
 	Transaction         Transaction
 	TransactionOutputID uint64

apiserver/server/context.go

@@ -1,62 +0,0 @@
-package server
-
-import (
-	"context"
-	"fmt"
-)
-
-type contextKey string
-
-const (
-	contextKeyRequestID contextKey = "REQUEST_ID"
-)
-
-type apiServerContext struct {
-	context.Context
-}
-
-func newAPIServerContext(ctx context.Context) *apiServerContext {
-	if asCtx, ok := ctx.(*apiServerContext); ok {
-		return asCtx
-	}
-	return &apiServerContext{Context: ctx}
-}
-
-func (ctx *apiServerContext) setRequestID(requestID uint64) context.Context {
-	context.WithValue(ctx, contextKeyRequestID, nextRequestID)
-	return ctx
-}
-
-func (ctx *apiServerContext) requestID() uint64 {
-	id := ctx.Value(contextKeyRequestID)
-	return id.(uint64)
-}
-
-func (ctx *apiServerContext) getLogString(format string, params ...interface{}) string {
-	params = append(params, ctx.requestID())
-	return fmt.Sprintf("RID %d: "+format, params)
-}
-
-func (ctx *apiServerContext) tracef(format string, params ...interface{}) {
-	log.Tracef(ctx.getLogString(format, params))
-}
-
-func (ctx *apiServerContext) debugf(format string, params ...interface{}) {
-	log.Debugf(ctx.getLogString(format, params))
-}
-
-func (ctx *apiServerContext) infof(format string, params ...interface{}) {
-	log.Infof(ctx.getLogString(format, params))
-}
-
-func (ctx *apiServerContext) warnf(format string, params ...interface{}) {
-	log.Warnf(ctx.getLogString(format, params))
-}
-
-func (ctx *apiServerContext) errorf(format string, params ...interface{}) {
-	log.Errorf(ctx.getLogString(format, params))
-}
-
-func (ctx *apiServerContext) criticalf(format string, params ...interface{}) {
-	log.Criticalf(ctx.getLogString(format, params))
-}

apiserver/server/middlewares.go

@@ -1,15 +1,16 @@
 package server
 
 import (
-	"fmt"
+	"github.com/daglabs/btcd/apiserver/utils"
 	"net/http"
+	"runtime/debug"
 )
 
 var nextRequestID uint64 = 1
 
 func addRequestMetadataMiddleware(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		rCtx := newAPIServerContext(r.Context()).setRequestID(nextRequestID)
+		rCtx := utils.ToAPIServerContext(r.Context()).SetRequestID(nextRequestID)
 		r.WithContext(rCtx)
 		nextRequestID++
 		next.ServeHTTP(w, r)
@@ -18,31 +19,30 @@ func addRequestMetadataMiddleware(next http.Handler) http.Handler {
 
 func loggingMiddleware(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		ctx := newAPIServerContext(r.Context())
+		ctx := utils.ToAPIServerContext(r.Context())
-		ctx.infof("Method: %s URI: %s", r.Method, r.RequestURI)
+		ctx.Infof("Method: %s URI: %s", r.Method, r.RequestURI)
 		next.ServeHTTP(w, r)
 	})
 }
 
 func recoveryMiddleware(h http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		ctx := newAPIServerContext(r.Context())
+		ctx := utils.ToAPIServerContext(r.Context())
-		var errStr string
 		defer func() {
 			recoveryErr := recover()
 			if recoveryErr != nil {
-				switch t := recoveryErr.(type) {
+				log.Criticalf("Fatal error: %s", recoveryErr)
-				case string:
+				log.Criticalf("Stack trace: %s", debug.Stack())
-					errStr = t
+				sendErr(ctx, w, utils.NewHandlerError(http.StatusInternalServerError, "A server error occurred."))
-				case error:
-					errStr = t.Error()
-				default:
-					errStr = "unknown error"
-				}
-				ctx.errorf("got error: %s", errStr)
-				http.Error(w, fmt.Sprintf("got error in request %d: %s", ctx.requestID(), errStr), http.StatusInternalServerError)
 			}
 		}()
 		h.ServeHTTP(w, r)
 	})
 }
+
+func setJSONMiddleware(h http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json; charset=utf-8")
+		h.ServeHTTP(w, r)
+	})
+}

apiserver/server/routes.go

@@ -0,0 +1,67 @@
+package server
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/daglabs/btcd/apiserver/controllers"
+	"github.com/daglabs/btcd/apiserver/utils"
+	"github.com/gorilla/mux"
+	"net/http"
+)
+
+const (
+	routeParamTxID   = "txID"
+	routeParamTxHash = "txHash"
+)
+
+func makeHandler(handler func(vars map[string]string, ctx *utils.APIServerContext) (interface{}, *utils.HandlerError)) func(http.ResponseWriter, *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
+		ctx := utils.ToAPIServerContext(r.Context())
+		response, hErr := handler(mux.Vars(r), ctx)
+		if hErr != nil {
+			sendErr(ctx, w, hErr)
+			return
+		}
+		sendJSONResponse(w, response)
+	}
+}
+
+func sendErr(ctx *utils.APIServerContext, w http.ResponseWriter, hErr *utils.HandlerError) {
+	errMsg := fmt.Sprintf("got error: %s", hErr)
+	ctx.Warnf(errMsg)
+	w.WriteHeader(hErr.ErrorCode)
+	sendJSONResponse(w, hErr)
+}
+
+func sendJSONResponse(w http.ResponseWriter, response interface{}) {
+	b, err := json.Marshal(response)
+	if err != nil {
+		panic(err)
+	}
+	_, err = fmt.Fprintf(w, string(b))
+	if err != nil {
+		panic(err)
+	}
+}
+
+func mainHandler(_ map[string]string, _ *utils.APIServerContext) (interface{}, *utils.HandlerError) {
+	return "API server is running", nil
+}
+
+func addRoutes(router *mux.Router) {
+	router.HandleFunc("/", makeHandler(mainHandler))
+
+	router.HandleFunc(
+		fmt.Sprintf("/transaction/id/{%s}", routeParamTxID),
+		makeHandler(func(vars map[string]string, ctx *utils.APIServerContext) (interface{}, *utils.HandlerError) {
+			return controllers.GetTransactionByIDHandler(vars[routeParamTxID])
+		})).
+		Methods("GET")
+
+	router.HandleFunc(
+		fmt.Sprintf("/transaction/hash/{%s}", routeParamTxHash),
+		makeHandler(func(vars map[string]string, ctx *utils.APIServerContext) (interface{}, *utils.HandlerError) {
+			return controllers.GetTransactionByHashHandler(vars[routeParamTxHash])
+		})).
+		Methods("GET")
+}

apiserver/server/server.go

@@ -2,7 +2,6 @@ package server
 
 import (
 	"context"
-	"fmt"
 	"github.com/gorilla/handlers"
 	"github.com/gorilla/mux"
 	"net/http"
@@ -11,13 +10,6 @@ import (
 
 const gracefulShutdownTimeout = 30 * time.Second
 
-func mainHandler(w http.ResponseWriter, r *http.Request) {
-	_, err := fmt.Fprintf(w, "API Server is running")
-	if err != nil {
-		panic(err)
-	}
-}
-
 // Start starts the HTTP REST server and returns a
 // function to gracefully shutdown it.
 func Start(listenAddr string) func() {
@@ -25,7 +17,8 @@ func Start(listenAddr string) func() {
 	router.Use(addRequestMetadataMiddleware)
 	router.Use(recoveryMiddleware)
 	router.Use(loggingMiddleware)
-	router.HandleFunc("/", mainHandler)
+	router.Use(setJSONMiddleware)
+	addRoutes(router)
 	httpServer := &http.Server{
 		Addr:    listenAddr,
 		Handler: handlers.CORS()(router),
@@ -38,7 +31,7 @@ func Start(listenAddr string) func() {
 		defer cancel()
 		err := httpServer.Shutdown(ctx)
 		if err != nil {
-			log.Errorf("Error shutting down http httpServer: %s", err)
+			log.Errorf("Error shutting down HTTP server: %s", err)
 		}
 	}
 }

apiserver/utils/context.go

@@ -0,0 +1,79 @@
+package utils
+
+import (
+	"context"
+	"fmt"
+)
+
+type contextKey string
+
+const (
+	contextKeyRequestID contextKey = "REQUEST_ID"
+)
+
+// APIServerContext is a context.Context wrapper that
+// enables custom logs with request ID.
+type APIServerContext struct {
+	context.Context
+}
+
+// ToAPIServerContext takes a context.Context instance
+// and converts it to *ApiServerContext.
+func ToAPIServerContext(ctx context.Context) *APIServerContext {
+	if asCtx, ok := ctx.(*APIServerContext); ok {
+		return asCtx
+	}
+	return &APIServerContext{Context: ctx}
+}
+
+// SetRequestID associates a request ID for the context.
+func (ctx *APIServerContext) SetRequestID(requestID uint64) context.Context {
+	context.WithValue(ctx, contextKeyRequestID, requestID)
+	return ctx
+}
+
+func (ctx *APIServerContext) requestID() uint64 {
+	id := ctx.Value(contextKeyRequestID)
+	uint64ID, _ := id.(uint64)
+	return uint64ID
+}
+
+func (ctx *APIServerContext) getLogString(format string, params ...interface{}) string {
+	return fmt.Sprintf("RID %d: ", ctx.requestID()) + fmt.Sprintf(format, params...)
+}
+
+// Tracef writes a customized formatted context
+// related log with log level 'Trace'.
+func (ctx *APIServerContext) Tracef(format string, params ...interface{}) {
+	log.Trace(ctx.getLogString(format, params...))
+}
+
+// Debugf writes a customized formatted context
+// related log with log level 'Debug'.
+func (ctx *APIServerContext) Debugf(format string, params ...interface{}) {
+	log.Debug(ctx.getLogString(format, params...))
+}
+
+// Infof writes a customized formatted context
+// related log with log level 'Info'.
+func (ctx *APIServerContext) Infof(format string, params ...interface{}) {
+	log.Info(ctx.getLogString(format, params...))
+}
+
+// Warnf writes a customized formatted context
+// related log with log level 'Warn'.
+func (ctx *APIServerContext) Warnf(format string, params ...interface{}) {
+	log.Warn(ctx.getLogString(format, params...))
+}
+
+// Errorf writes a customized formatted context
+// related log with log level 'Error'.
+func (ctx *APIServerContext) Errorf(format string, params ...interface{}) {
+	log.Error(ctx.getLogString(format, params...))
+}
+
+// Criticalf writes a customized formatted context
+// related log with log level 'Critical'.
+func (ctx *APIServerContext) Criticalf(format string, params ...interface{}) {
+	log.Criticalf(ctx.getLogString(format, params...))
+}

apiserver/utils/error.go

@@ -0,0 +1,20 @@
+package utils
+
+// HandlerError is an error returned from
+// a rest route handler or a middleware.
+type HandlerError struct {
+	ErrorCode    int
+	ErrorMessage string
+}
+
+func (hErr *HandlerError) Error() string {
+	return hErr.ErrorMessage
+}
+
+// NewHandlerError returns a HandlerError with the given code and message.
+func NewHandlerError(code int, message string) *HandlerError {
+	return &HandlerError{
+		ErrorCode:    code,
+		ErrorMessage: message,
+	}
+}

apiserver/utils/log.go

@@ -0,0 +1,9 @@
+package utils
+
+import "github.com/daglabs/btcd/util/panics"
+import "github.com/daglabs/btcd/apiserver/logger"
+
+var (
+	log   = logger.BackendLog.Logger("UTIL")
+	spawn = panics.GoroutineWrapperFunc(log, logger.BackendLog)
+)

go.mod

@@ -11,16 +11,13 @@ require (
 	github.com/btcsuite/websocket v0.0.0-20150119174127-31079b680792
 	github.com/btcsuite/winsvc v1.0.0
 	github.com/davecgh/go-spew v1.1.1
-	github.com/golang/protobuf v1.3.1 // indirect
+	github.com/golang-migrate/migrate/v4 v4.6.1
 	github.com/gorilla/handlers v1.4.2
-	github.com/gorilla/mux v1.6.2
+	github.com/gorilla/mux v1.7.1
 	github.com/jessevdk/go-flags v1.4.0
 	github.com/jinzhu/gorm v1.9.10
 	github.com/jrick/logrotate v1.0.0
 	github.com/kkdai/bstream v0.0.0-20181106074824-b3251f7901ec
 	github.com/miekg/dns v1.1.6
-	github.com/stretchr/testify v1.3.0 // indirect
+	golang.org/x/crypto v0.0.0-20190426145343-a29dc8fdc734
-	golang.org/x/crypto v0.0.0-20190325154230-a5d413f7728c
-	golang.org/x/sync v0.0.0-20190412183630-56d357773e84 // indirect
-	golang.org/x/sys v0.0.0-20190312061237-fead79001313 // indirect
 )

go.sum

@@ -3,7 +3,10 @@ bou.ke/monkey v1.0.1/go.mod h1:FgHuK96Rv2Nlf+0u1OOVDpCMdsWyOFmeeketDHE7LIg=
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.37.4/go.mod h1:NHPJ89PdicEuT9hdPXMROBD91xc5uRDxsMtSB16k7hw=
+github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/Microsoft/go-winio v0.4.11/go.mod h1:VhR8bwka0BXejwEJY73c50VrPtXAaKcyvVC4A4RozmA=
+github.com/Nvveen/Gotty v0.0.0-20120604004816-cd527374f1e5/go.mod h1:lmUJ/7eu/Q8D7ML55dXQrVaamCz2vxCfdQBasLZfHKk=
 github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
 github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
 github.com/aead/siphash v1.0.1 h1:FwHfE/T45KPKYuuSAKyyvE+oPWcaQ+CUmFW0bPlM+kg=
@@ -11,7 +14,10 @@ github.com/aead/siphash v1.0.1/go.mod h1:Nywa3cDsYNNK3gaciGTWPwHt0wlpNV15vwmswBA
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/apache/thrift v0.12.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
+github.com/aws/aws-sdk-go v1.17.7/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/bitly/go-hostpool v0.0.0-20171023180738-a3a6125de932/go.mod h1:NOuUCSz6Q9T7+igc/hlvDOUdtWKryOrtFyIVABv/p7k=
+github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869/go.mod h1:Ekp36dRnpXw/yCqJaO+ZrUyxD+3VXMFFr56k5XYrpB4=
 github.com/btcsuite/btclog v0.0.0-20170628155309-84c8d2346e9f h1:bAs4lUbRJpnnkd9VhRV3jjAVU7DJVjMaK+IsvSeZvFo=
 github.com/btcsuite/btclog v0.0.0-20170628155309-84c8d2346e9f/go.mod h1:TdznJufoqS23FtqVCzL0ZqgP5MqXbb4fg/WgDys70nA=
 github.com/btcsuite/go-socks v0.0.0-20170105172521-4720035b7bfd h1:R/opQEbFEy9JGkIguV40SvRY1uliPX8ifOvi6ICsFCw=
@@ -25,32 +31,61 @@ github.com/btcsuite/websocket v0.0.0-20150119174127-31079b680792/go.mod h1:ghJtE
 github.com/btcsuite/winsvc v1.0.0 h1:J9B4L7e3oqhXOcm+2IuNApwzQec85lE+QaikUcCs+dk=
 github.com/btcsuite/winsvc v1.0.0/go.mod h1:jsenWakMcC0zFBFurPLEAyrnc/teJEM1O46fmI40EZs=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/cockroachdb/apd v1.1.0/go.mod h1:8Sl8LxpKi29FqWXR16WEFZRNSz3SoPzUzeMeY4+DwBQ=
+github.com/cockroachdb/cockroach-go v0.0.0-20181001143604-e0a95dfd547c/go.mod h1:XGLbWH/ujMcbPbhZq52Nv6UrCghb1yGn//133kEsvDk=
+github.com/containerd/containerd v1.2.7/go.mod h1:bC6axHOhabU15QhwfG7w5PipXdVtMXFTttgp+kVtyUA=
+github.com/cznic/b v0.0.0-20180115125044-35e9bbe41f07/go.mod h1:URriBxXwVq5ijiJ12C7iIZqlA69nTlI+LgI6/pwftG8=
+github.com/cznic/fileutil v0.0.0-20180108211300-6a051e75936f/go.mod h1:8S58EK26zhXSxzv7NQFpnliaOQsmDUxvoQO3rt154Vg=
+github.com/cznic/golex v0.0.0-20170803123110-4ab7c5e190e4/go.mod h1:+bmmJDNmKlhWNG+gwWCkaBoTy39Fs+bzRxVBzoTQbIc=
+github.com/cznic/internal v0.0.0-20180608152220-f44710a21d00/go.mod h1:olo7eAdKwJdXxb55TKGLiJ6xt1H0/tiiRCWKVLmtjY4=
+github.com/cznic/lldb v1.1.0/go.mod h1:FIZVUmYUVhPwRiPzL8nD/mpFcJ/G7SSXjjXYG4uRI3A=
+github.com/cznic/mathutil v0.0.0-20180504122225-ca4c9f2c1369/go.mod h1:e6NPNENfs9mPDVNRekM7lKScauxd5kXTr1Mfyig6TDM=
+github.com/cznic/ql v1.2.0/go.mod h1:FbpzhyZrqr0PVlK6ury+PoW3T0ODUV22OeWIxcaOrSE=
+github.com/cznic/sortutil v0.0.0-20150617083342-4c7342852e65/go.mod h1:q2w6Bg5jeox1B+QkJ6Wp/+Vn0G/bo3f1uY7Fn3vivIQ=
+github.com/cznic/strutil v0.0.0-20171016134553-529a34b1c186/go.mod h1:AHHPPPXTw0h6pVabbcbyGRK1DckRn7r/STdZEeIDzZc=
+github.com/cznic/zappy v0.0.0-20160723133515-2533cb5b45cc/go.mod h1:Y1SNZ4dRUOKXshKUbwUapqNncRrho4mkjQebgEHZLj8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/denisenkom/go-mssqldb v0.0.0-20190515213511-eb9f6a1743f3/go.mod h1:zAg7JM8CkOJ43xKXIj7eRO9kmWm/TW578qo+oDO6tuM=
+github.com/dhui/dktest v0.3.0/go.mod h1:cyzIUfGsBEbZ6BT7tnXqAShHSXCZhSNmFl70sZ7c1yc=
+github.com/docker/distribution v2.7.0+incompatible/go.mod h1:J2gT2udsDAN96Uj4KfcMRqY0/ypR+oyYUYmja8H+y+w=
+github.com/docker/docker v0.7.3-0.20190103212154-2b7e084dc98b/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
+github.com/docker/docker v0.7.3-0.20190817195342-4760db040282/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
+github.com/docker/go-connections v0.4.0/go.mod h1:Gbd7IOopHjR8Iph03tsViu4nIes5XhDvyHbTtUxmeec=
+github.com/docker/go-units v0.3.3/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
 github.com/eapache/go-resiliency v1.1.0/go.mod h1:kFI+JgMyC7bLPUVY133qvEBtVayf5mFgVsvEsIPBvNs=
 github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21/go.mod h1:+020luEh2TKB4/GOp8oxxtq0Daoen/Cii55CzbTV6DU=
 github.com/eapache/queue v1.1.0/go.mod h1:6eCeP0CKFpHLu8blIFXhExK/dRa7WDZfr6jVFPTqq+I=
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 github.com/erikstmartin/go-testdb v0.0.0-20160219214506-8d10e4a1bae5/go.mod h1:a2zkGnVExMxdzMo3M0Hi/3sEU+cWnZpSni0O6/Yb/P0=
 github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
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 github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
 github.com/go-sql-driver/mysql v1.4.1 h1:g24URVg0OFbNUTx9qqY1IRZ9D9z3iPyi5zKhQZpNwpA=
 github.com/go-sql-driver/mysql v1.4.1/go.mod h1:zAC/RDZ24gD3HViQzih4MyKcchzm+sOG5ZlKdlhCg5w=
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
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 github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
 github.com/gogo/protobuf v1.2.0/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
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 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
 github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.1 h1:YF8+flBXS5eO826T4nzqPrxfhQThhXl0YzfuUPu4SBg=
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/snappy v0.0.0-20170215233205-553a64147049/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
+github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
+github.com/google/go-github v17.0.0+incompatible/go.mod h1:zLgOLi98H3fifZn+44m+umXrS52loVEgC2AApnigrVQ=
+github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck=
 github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=
 github.com/google/pprof v0.0.0-20181206194817-3ea8567a2e57/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
 github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
@@ -59,9 +94,19 @@ github.com/gorilla/handlers v1.4.2 h1:0QniY0USkHQ1RGCLfKxeNHK9bkDHGRYGNDFBCS+YAR
 github.com/gorilla/handlers v1.4.2/go.mod h1:Qkdc/uu4tH4g6mTK6auzZ766c4CA0Ng8+o/OAirnOIQ=
 github.com/gorilla/mux v1.6.2 h1:Pgr17XVTNXAk3q/r4CpKzC5xBM/qW1uVLV+IhRZpIIk=
 github.com/gorilla/mux v1.6.2/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
+github.com/gorilla/mux v1.7.1 h1:Dw4jY2nghMMRsh1ol8dv1axHkDwMQK2DHerMNJsIpJU=
+github.com/gorilla/mux v1.7.1/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
+github.com/hailocab/go-hostpool v0.0.0-20160125115350-e80d13ce29ed/go.mod h1:tMWxXQ9wFIaZeTI9F+hmhFiGpFmhOHzyShyFUhRm0H4=
+github.com/hashicorp/errwrap v1.0.0 h1:hLrqtEDnRye3+sgx6z4qVLNuviH3MR5aQ0ykNJa/UYA=
+github.com/hashicorp/errwrap v1.0.0/go.mod h1:YH+1FKiLXxHSkmPseP+kNlulaMuP3n2brvKWEqk/Jc4=
+github.com/hashicorp/go-multierror v1.0.0 h1:iVjPR7a6H0tWELX5NxNe7bYopibicUzc7uPribsnS6o=
+github.com/hashicorp/go-multierror v1.0.0/go.mod h1:dHtQlpGsu+cZNNAkkCN/P3hoUDHhCYQXV3UM06sGGrk=
 github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
+github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
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 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
+github.com/jackc/fake v0.0.0-20150926172116-812a484cc733/go.mod h1:WrMFNQdiFJ80sQsxDoMokWK1W5TQtxBFNpzWTD84ibQ=
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