Merge pull request #559 from bugout-dev/blancer-app-auth

Auth workflow for balancer
2022-05-17 21:17:29 +03:00 · 2022-05-17 21:17:29 +03:00 · bbede82fd4
commit bbede82fd4
--- a/.gitignore
+++ b/.gitignore
@ -1,3 +1,4 @@
+.secrets/
 .idea/
 .vscode/
-.DS_Store
+.DS_Store
--- a/crawlers/deploy/moonworm-unicorns-mainnet.service
+++ b/crawlers/deploy/moonworm-unicorns-mainnet.service
@ -11,7 +11,7 @@ EnvironmentFile=/home/ubuntu/moonstream-secrets/app.env
 Restart=on-failure
 RestartSec=15s
 ExecStart=/home/ubuntu/moonworm-env/bin/python -m moonworm.cli watch-cu \
-    -w "$MOONSTREAM_POLYGON_WEB3_PROVIDER_URI" \
+    -w "${MOONSTREAM_POLYGON_WEB3_PROVIDER_URI}?access_id=${NB_CONTROLLER_ACCESS_ID}&data_source=blockchain" \
    -c 0xdC0479CC5BbA033B3e7De9F178607150B3AbCe1f \
    -d 21418707 \
    --confirmations 60
--- a/nodes/node_balancer/README.md
+++ b/nodes/node_balancer/README.md
@ -1,16 +1,99 @@
 # Node Balancer application

-## Installation
+# Installation

- Prepare environment variables
- Build application
+-   Prepare environment variables
+-   Build application

 ```bash
-go build -o nodebalancer
+go build -o nodebalancer .
 ```

- Run with following parameters:
+# Work with nodebalancer
+
+## add-access
+
+Add new access for user:

 ```bash
-nodebalancer -host 0.0.0.0 -port 8544 -healthcheck
+nodebalancer add-access \
+	--user-id "<user_uuid>" \
+	--access-id "<access_uuid>" \
+	--name "Access name" \
+	--description "Description of access" \
+	--extended-methods false \
+	--blockchain--access true
+```
+
+## delete-access
+
+Delete user access:
+
+```bash
+nodebalancer delete-access \
+	--user-id "<user_uuid>" \
+	--access-id "<access_uuid>"
+```
+
+If `access-id` not specified, all user accesses will be deleted.
+
+## users
+
+```bash
+nodebalancer users | jq .
+```
+
+This command will return a list of bugout resources of registered users to access node balancer with their `crawlers/app/project` (in our project we will call it `crawlers`).
+
+```json
+[
+	{
+		"user_id": "<user_id_from_any_bugout_application>",
+		"access_id": "<access_uuid_which_provided_with_query>",
+		"name": "<short_description_of_purpose_of_this_crawler>",
+		"description": "<long_description>",
+		"blockchain_access": true,
+		"extended_methods": false
+	}
+]
+```
+
+`access_id` - token which allow access to nodebalancer, could be specified in both ways:
+
+-   as a header `x-moonstream-access-id` with value `access_id`
+-   as query parameter `access_id=access_id`
+
+`blockchain_access` - boolean which allow you or not to have access to blockchain node, otherwise you will be redirected to database
+
+`extended_methods` - boolean which allow you to call not whitelisted method to blockchain node, by default for new user this is equal to `false`
+
+## server
+
+```bash
+nodebalancer server -host 0.0.0.0 -port 8544 -healthcheck
+```
+
+Flag `--healthcheck` will execute background process to ping-pong available nodes to keep their status and current block number.
+Flag `--debug` will extend output of each request to server and healthchecks summary.
+
+# Work with node
+
+Common request to fetch block number
+
+```bash
+curl --request GET 'http://127.0.0.1:8544/nb/ethereum/jsonrpc?access_id=<access_id>&data_source=<blockchain/database>' \
+    --header 'Content-Type: application/json' \
+    --data-raw '{
+        "jsonrpc":"2.0",
+        "method":"eth_getBlockByNumber",
+        "params":["0xb71b64", false],
+        "id":1
+    }'
+```
+
+For Web3 providers `access_id` and `data_source` could be specified in headers
+
+```bash
+--header 'x-node-balancer-data-source: <blockchain/database>'
+--header 'x-node-balancer-access-id: <access_id>'
 ```
--- a/nodes/node_balancer/cmd/balancer.go
+++ b/nodes/node_balancer/cmd/balancer.go
@ -9,7 +9,9 @@ import (
 	"io/ioutil"
 	"log"
 	"net/http"
+	"net/http/httputil"
 	"net/url"
+	"sync"
 	"sync/atomic"

 	configs "github.com/bugout-dev/moonstream/nodes/node_balancer/configs"
@ -19,6 +21,38 @@ import (
 // for each blockchain we work during session.
 var blockchainPool BlockchainPool

+// Node structure with
+// StatusURL for status server at node endpoint
+// GethURL for geth/bor/etc node http.server endpoint
+type Node struct {
+	StatusURL *url.URL
+	GethURL   *url.URL
+
+	Alive        bool
+	CurrentBlock uint64
+
+	mux sync.RWMutex
+
+	StatusReverseProxy *httputil.ReverseProxy
+	GethReverseProxy   *httputil.ReverseProxy
+}
+
+type NodePool struct {
+	Blockchain string
+	Nodes      []*Node
+
+	// Counter to observe all nodes
+	Current uint64
+}
+
+type BlockchainPool struct {
+	Blockchains []*NodePool
+}
+
+type NodeStatusResponse struct {
+	CurrentBlock uint64 `json:"current_block"`
+}
+
 // AddNode to the nodes pool
 func (bpool *BlockchainPool) AddNode(node *Node, blockchain string) {
 	var nodePool *NodePool
--- a/nodes/node_balancer/cmd/blockchain.go
+++ b/nodes/node_balancer/cmd/blockchain.go
@ -0,0 +1,105 @@
+package cmd
+
+import (
+	"io/ioutil"
+	"log"
+	"strconv"
+	"strings"
+
+	configs "github.com/bugout-dev/moonstream/nodes/node_balancer/configs"
+)
+
+var (
+	nodeConfigs NodeConfigs
+
+	ALLOWED_METHODS = map[string]bool{
+		"eth_blockNumber":                         true,
+		"eth_call":                                true,
+		"eth_chainId":                             true,
+		"eth_estimateGas":                         true,
+		"eth_feeHistory":                          true,
+		"eth_gasPrice":                            true,
+		"eth_getBalance":                          true,
+		"eth_getBlockByHash":                      true,
+		"eth_getBlockByNumber":                    true,
+		"eth_getBlockTransactionCountByHash":      true,
+		"eth_getBlockTransactionCountByNumber":    true,
+		"eth_getCode":                             true,
+		"eth_getLogs":                             true,
+		"eth_getStorageAt":                        true,
+		"eth_getTransactionByHash":                true,
+		"eth_getTransactionByBlockHashAndIndex":   true,
+		"eth_getTransactionByBlockNumberAndIndex": true,
+		"eth_getTransactionCount":                 true,
+		"eth_getTransactionReceipt":               true,
+		"eth_getUncleByBlockHashAndIndex":         true,
+		"eth_getUncleByBlockNumberAndIndex":       true,
+		"eth_getUncleCountByBlockHash":            true,
+		"eth_getUncleCountByBlockNumber":          true,
+		"eth_getWork":                             true,
+		"eth_mining":                              true,
+		// "eth_sendRawTransaction": true,
+		"eth_protocolVersion": true,
+		"eth_syncing":         true,
+
+		"net_listening": true,
+		"net_peerCount": true,
+		"net_version":   true,
+
+		"web3_clientVersion": true,
+	}
+)
+
+type JSONRPCRequest struct {
+	Jsonrpc string        `json:"jsonrpc"`
+	Method  string        `json:"method"`
+	Params  []interface{} `json:"params"`
+	ID      uint64        `json:"id"`
+}
+
+// Node conf
+type BlockchainConfig struct {
+	Blockchain string
+	IPs        []string
+	Port       string
+}
+
+type NodeConfig struct {
+	Blockchain string
+	Addr       string
+	Port       uint16
+}
+
+type NodeConfigs struct {
+	NodeConfigs []NodeConfig
+}
+
+// Return list of NodeConfig structures
+func (nc *NodeConfigs) InitNodeConfigList(configPath string) {
+	configs.CheckEnvVarSet()
+
+	rawBytes, err := ioutil.ReadFile(configPath)
+	if err != nil {
+		log.Fatalf("Unable to read config file, %v", err)
+	}
+	text := string(rawBytes)
+	lines := strings.Split(text, "\n")
+
+	// Define available blockchain nodes
+	for _, line := range lines {
+		fields := strings.Split(line, ",")
+		if len(fields) == 3 {
+			port, err := strconv.ParseInt(fields[2], 0, 16)
+			if err != nil {
+				log.Printf("Unable to parse port number, %v", err)
+				continue
+			}
+
+			nc.NodeConfigs = append(nc.NodeConfigs, NodeConfig{
+				Blockchain: fields[0],
+				Addr:       fields[1],
+				Port:       uint16(port),
+			})
+		}
+	}
+}
--- a/nodes/node_balancer/cmd/cli.go
+++ b/nodes/node_balancer/cmd/cli.go
@ -1,17 +1,23 @@
 package cmd

 import (
+	"encoding/json"
 	"flag"
 	"fmt"
-	"log"
 	"os"
 	"strings"

+	bugout "github.com/bugout-dev/bugout-go/pkg"
+	"github.com/google/uuid"
+
 	"github.com/bugout-dev/moonstream/nodes/node_balancer/configs"
 )

 var (
+	// Storing CLI definitions at server startup
 	stateCLI StateCLI
+
+	bugoutClient bugout.BugoutClient
 )

 type flagSlice []string
@ -27,39 +33,67 @@ func (i *flagSlice) Set(value string) error {

 // Command Line Interface state
 type StateCLI struct {
-	serverCmd  *flag.FlagSet
-	versionCmd *flag.FlagSet
+	addAccessCmd    *flag.FlagSet
+	deleteAccessCmd *flag.FlagSet
+	serverCmd       *flag.FlagSet
+	usersCmd        *flag.FlagSet
+	versionCmd      *flag.FlagSet

 	// Common flags
 	configPathFlag string
 	helpFlag       bool

+	// Add user access flags
+	userIDFlag            string
+	accessIDFlag          string
+	accessNameFlag        string
+	accessDescriptionFlag string
+	blockchainAccessFlag  bool
+	extendedMethodsFlag   bool
+
 	// Server flags
 	listeningAddrFlag     string
 	listeningPortFlag     string
-	nodesFlag             flagSlice
 	enableHealthCheckFlag bool
 	enableDebugFlag       bool
+
+	// Users list flags
+	limitFlag  int
+	offsetFlag int
 }

 func (s *StateCLI) usage() {
-	fmt.Printf(`usage: nodebalancer [-h] {%[1]s,%[2]s} ...
+	fmt.Printf(`usage: nodebalancer [-h] {%[1]s,%[2]s,%[3]s,%[4]s,%[5]s} ...
+
 Moonstream node balancer CLI
 optional arguments:
    -h, --help         show this help message and exit

 subcommands:
-    {%[1]s,%[2]s}
-`, s.serverCmd.Name(), s.versionCmd.Name())
+    {%[1]s,%[2]s,%[3]s,%[4]s,%[5]s}
+`, s.addAccessCmd.Name(), s.deleteAccessCmd.Name(), s.serverCmd.Name(), s.usersCmd.Name(), s.versionCmd.Name())
 }

+// Check if required flags are set
 func (s *StateCLI) checkRequirements() {
 	if s.helpFlag {
 		switch {
+		case s.addAccessCmd.Parsed():
+			fmt.Printf("Add new user access token\n\n")
+			s.addAccessCmd.PrintDefaults()
+			os.Exit(0)
+		case s.deleteAccessCmd.Parsed():
+			fmt.Printf("Delete user access token\n\n")
+			s.deleteAccessCmd.PrintDefaults()
+			os.Exit(0)
 		case s.serverCmd.Parsed():
 			fmt.Printf("Start nodebalancer server\n\n")
 			s.serverCmd.PrintDefaults()
 			os.Exit(0)
+		case s.usersCmd.Parsed():
+			fmt.Printf("List user access tokens\n\n")
+			s.usersCmd.PrintDefaults()
+			os.Exit(0)
 		case s.versionCmd.Parsed():
 			fmt.Printf("Show version\n\n")
 			s.versionCmd.PrintDefaults()
@ -70,49 +104,76 @@ func (s *StateCLI) checkRequirements() {
 		}
 	}

+	switch {
+	case s.addAccessCmd.Parsed():
+		if s.userIDFlag == "" {
+			fmt.Printf("User ID should be specified\n\n")
+			s.addAccessCmd.PrintDefaults()
+			os.Exit(1)
+		}
+		if s.accessIDFlag == "" {
+			s.accessIDFlag = uuid.New().String()
+		}
+		if s.accessNameFlag == "" {
+			fmt.Printf("Access name should be specified\n\n")
+			s.addAccessCmd.PrintDefaults()
+			os.Exit(1)
+		}
+	case s.deleteAccessCmd.Parsed():
+		if s.userIDFlag == "" && s.accessIDFlag == "" {
+			fmt.Printf("User or access ID flag should be specified\n\n")
+			s.deleteAccessCmd.PrintDefaults()
+			os.Exit(1)
+		}
+	case s.usersCmd.Parsed():
+		if s.offsetFlag < 0 || s.limitFlag < 0 {
+			fmt.Printf("Offset and limit flags should be greater then zero\n\n")
+			s.usersCmd.PrintDefaults()
+			os.Exit(1)
+		}
+	}
+
 	if s.configPathFlag == "" {
-		homeDir, err := os.UserHomeDir()
-		if err != nil {
-			log.Fatalf("Unable to find user home directory, %v", err)
-		}
-
-		configDirPath := fmt.Sprintf("%s/.nodebalancer", homeDir)
-		configPath := fmt.Sprintf("%s/config.txt", configDirPath)
-
-		err = os.MkdirAll(configDirPath, os.ModePerm)
-		if err != nil {
-			log.Fatalf("Unable to create directory, %v", err)
-		}
-
-		_, err = os.Stat(configPath)
-		if err != nil {
-			tempConfigB := []byte("ethereum,http://127.0.0.1,8545")
-			err = os.WriteFile(configPath, tempConfigB, 0644)
-			if err != nil {
-				log.Fatalf("Unable to write config, %v", err)
-			}
-		}
-
+		configPath := configs.GenerateDefaultConfig()
 		s.configPathFlag = configPath
 	}
 }

 func (s *StateCLI) populateCLI() {
 	// Subcommands setup
+	s.addAccessCmd = flag.NewFlagSet("add-access", flag.ExitOnError)
+	s.deleteAccessCmd = flag.NewFlagSet("delete-access", flag.ExitOnError)
 	s.serverCmd = flag.NewFlagSet("server", flag.ExitOnError)
+	s.usersCmd = flag.NewFlagSet("users", flag.ExitOnError)
 	s.versionCmd = flag.NewFlagSet("version", flag.ExitOnError)

 	// Common flag pointers
-	for _, fs := range []*flag.FlagSet{s.serverCmd, s.versionCmd} {
+	for _, fs := range []*flag.FlagSet{s.addAccessCmd, s.deleteAccessCmd, s.serverCmd, s.usersCmd, s.versionCmd} {
 		fs.BoolVar(&s.helpFlag, "help", false, "Show help message")
 		fs.StringVar(&s.configPathFlag, "config", "", "Path to configuration file (default: ~/.nodebalancer/config.txt)")
 	}

+	// Add, delete and list user access subcommand flag pointers
+	for _, fs := range []*flag.FlagSet{s.addAccessCmd, s.deleteAccessCmd, s.usersCmd} {
+		fs.StringVar(&s.userIDFlag, "user-id", "", "Bugout user ID")
+		fs.StringVar(&s.accessIDFlag, "access-id", "", "UUID for access identification")
+	}
+
+	// Add user access subcommand flag pointers
+	s.addAccessCmd.StringVar(&s.accessNameFlag, "name", "", "Name of access")
+	s.addAccessCmd.StringVar(&s.accessDescriptionFlag, "description", "", "Description of access")
+	s.addAccessCmd.BoolVar(&s.blockchainAccessFlag, "blockchain-access", false, "Provide if allow direct access to blockchain nodes")
+	s.addAccessCmd.BoolVar(&s.extendedMethodsFlag, "extended-methods", false, "Provide to be able to execute not whitelisted methods")
+
 	// Server subcommand flag pointers
 	s.serverCmd.StringVar(&s.listeningAddrFlag, "host", "127.0.0.1", "Server listening address")
 	s.serverCmd.StringVar(&s.listeningPortFlag, "port", "8544", "Server listening port")
-	s.serverCmd.BoolVar(&s.enableHealthCheckFlag, "healthcheck", false, "To enable healthcheck ser healthcheck flag")
+	s.serverCmd.BoolVar(&s.enableHealthCheckFlag, "healthcheck", false, "To enable healthcheck set healthcheck flag")
 	s.serverCmd.BoolVar(&s.enableDebugFlag, "debug", false, "To enable debug mode with extended log set debug flag")
+
+	// Users list subcommand flag pointers
+	s.usersCmd.IntVar(&s.limitFlag, "limit", 10, "Output result limit")
+	s.usersCmd.IntVar(&s.offsetFlag, "offset", 0, "Result output offset")
 }

 func CLI() {
@ -122,14 +183,161 @@ func CLI() {
 		os.Exit(1)
 	}

+	// Init bugout client
+	bc, err := bugout.ClientFromEnv()
+	if err != nil {
+		fmt.Printf("Unable to initialize bugout client %v", err)
+		os.Exit(1)
+	}
+	bugoutClient = bc
+
 	// Parse subcommands and appropriate FlagSet
 	switch os.Args[1] {
+	case "add-access":
+		stateCLI.addAccessCmd.Parse(os.Args[2:])
+		stateCLI.checkRequirements()
+
+		proposedUserAccess := ClientResourceData{
+			UserID:           stateCLI.userIDFlag,
+			AccessID:         stateCLI.accessIDFlag,
+			Name:             stateCLI.accessNameFlag,
+			Description:      stateCLI.accessDescriptionFlag,
+			BlockchainAccess: stateCLI.blockchainAccessFlag,
+			ExtendedMethods:  stateCLI.extendedMethodsFlag,
+		}
+		_, err := bugoutClient.Brood.FindUser(
+			configs.NB_CONTROLLER_TOKEN,
+			map[string]string{
+				"user_id":        proposedUserAccess.UserID,
+				"application_id": configs.NB_APPLICATION_ID,
+			},
+		)
+		if err != nil {
+			fmt.Printf("User does not exists %v\n", err)
+			os.Exit(1)
+		}
+		resource, err := bugoutClient.Brood.CreateResource(configs.NB_CONTROLLER_TOKEN, configs.NB_APPLICATION_ID, proposedUserAccess)
+		if err != nil {
+			fmt.Printf("Unable to create user access %v\n", err)
+			os.Exit(1)
+		}
+		resource_data, err := json.Marshal(resource.ResourceData)
+		if err != nil {
+			fmt.Printf("Unable to encode resource %s data interface to json %v", resource.Id, err)
+			os.Exit(1)
+		}
+		fmt.Println(string(resource_data))
+
+	case "delete-access":
+		stateCLI.deleteAccessCmd.Parse(os.Args[2:])
+		stateCLI.checkRequirements()
+
+		queryParameters := make(map[string]string)
+		if stateCLI.userIDFlag != "" {
+			queryParameters["user_id"] = stateCLI.userIDFlag
+		}
+		if stateCLI.accessIDFlag != "" {
+			queryParameters["access_id"] = stateCLI.accessIDFlag
+		}
+		resources, err := bugoutClient.Brood.GetResources(
+			configs.NB_CONTROLLER_TOKEN,
+			configs.NB_APPLICATION_ID,
+			queryParameters,
+		)
+		if err != nil {
+			fmt.Printf("Unable to get Bugout resources %v\n", err)
+			os.Exit(1)
+		}
+
+		var userAccesses []ClientResourceData
+		for _, resource := range resources.Resources {
+			deletedResource, err := bugoutClient.Brood.DeleteResource(configs.NB_CONTROLLER_TOKEN, resource.Id)
+			if err != nil {
+				fmt.Printf("Unable to delete resource %s %v\n", resource.Id, err)
+				continue
+			}
+			resource_data, err := json.Marshal(deletedResource.ResourceData)
+			if err != nil {
+				fmt.Printf("Unable to encode resource %s data interface to json %v", resource.Id, err)
+				continue
+			}
+			var userAccess ClientResourceData
+			err = json.Unmarshal(resource_data, &userAccess)
+			if err != nil {
+				fmt.Printf("Unable to decode resource %s data json to structure %v", resource.Id, err)
+				continue
+			}
+			userAccesses = append(userAccesses, userAccess)
+		}
+
+		userAccessesJson, err := json.Marshal(userAccesses)
+		if err != nil {
+			fmt.Printf("Unable to marshal user access struct %v\n", err)
+			os.Exit(1)
+		}
+		fmt.Println(string(userAccessesJson))
+
 	case "server":
 		stateCLI.serverCmd.Parse(os.Args[2:])
 		stateCLI.checkRequirements()

+		configs.CheckEnvVarSet()
+
 		Server()

+	case "users":
+		stateCLI.usersCmd.Parse(os.Args[2:])
+		stateCLI.checkRequirements()
+
+		var queryParameters map[string]string
+		if stateCLI.userIDFlag != "" {
+			queryParameters["user_id"] = stateCLI.userIDFlag
+		}
+		if stateCLI.accessIDFlag != "" {
+			queryParameters["access_id"] = stateCLI.accessIDFlag
+		}
+		resources, err := bugoutClient.Brood.GetResources(
+			configs.NB_CONTROLLER_TOKEN,
+			configs.NB_APPLICATION_ID,
+			queryParameters,
+		)
+		if err != nil {
+			fmt.Printf("Unable to get Bugout resources %v\n", err)
+			os.Exit(1)
+		}
+
+		var userAccesses []ClientResourceData
+
+		offset := stateCLI.offsetFlag
+		if stateCLI.offsetFlag > len(resources.Resources) {
+			offset = len(resources.Resources)
+		}
+		limit := stateCLI.offsetFlag + stateCLI.limitFlag
+		if limit > len(resources.Resources) {
+			limit = len(resources.Resources[offset:]) + offset
+		}
+
+		for _, resource := range resources.Resources[offset:limit] {
+			resource_data, err := json.Marshal(resource.ResourceData)
+			if err != nil {
+				fmt.Printf("Unable to encode resource %s data interface to json %v", resource.Id, err)
+				continue
+			}
+			var userAccess ClientResourceData
+			err = json.Unmarshal(resource_data, &userAccess)
+			if err != nil {
+				fmt.Printf("Unable to decode resource %s data json to structure %v", resource.Id, err)
+				continue
+			}
+			userAccesses = append(userAccesses, userAccess)
+		}
+		userAccessesJson, err := json.Marshal(userAccesses)
+		if err != nil {
+			fmt.Printf("Unable to marshal user accesses struct %v\n", err)
+			os.Exit(1)
+		}
+		fmt.Println(string(userAccessesJson))
+
 	case "version":
 		stateCLI.versionCmd.Parse(os.Args[2:])
 		stateCLI.checkRequirements()
--- a/nodes/node_balancer/cmd/clients.go
+++ b/nodes/node_balancer/cmd/clients.go
@ -3,6 +3,7 @@ package cmd
 import (
 	"errors"
 	"reflect"
+	"sync"
 	"time"

 	configs "github.com/bugout-dev/moonstream/nodes/node_balancer/configs"
@ -14,14 +15,40 @@ var (
 	xdaiClientPool     ClientPool
 )

-// Generate client pools for different blockchains
+// Structure to define user access according with Brood resources
+type ClientResourceData struct {
+	UserID           string `json:"user_id"`
+	AccessID         string `json:"access_id"`
+	Name             string `json:"name"`
+	Description      string `json:"description"`
+	BlockchainAccess bool   `json:"blockchain_access"`
+	ExtendedMethods  bool   `json:"extended_methods"`
+
+	dataSource string
+}
+
+// Node - which one node client worked with
+// LastCallTs - timestamp from last call
+type Client struct {
+	Node       *Node
+	LastCallTs int64
+
+	mux sync.RWMutex
+}
+
+// Where id is a key and equal to ClientResourceData -> AccessID
+type ClientPool struct {
+	Client map[string]*Client
+}
+
+// Generate pools for clients for different blockchains
 func CreateClientPools() {
 	ethereumClientPool.Client = make(map[string]*Client)
 	polygonClientPool.Client = make(map[string]*Client)
 	xdaiClientPool.Client = make(map[string]*Client)
 }

-// Return client pool correspongin to blockchain
+// Return client pool corresponding to provided blockchain
 func GetClientPool(blockchain string) (*ClientPool, error) {
 	var cpool *ClientPool
 	if blockchain == "ethereum" {
@ -31,7 +58,7 @@ func GetClientPool(blockchain string) (*ClientPool, error) {
 	} else if blockchain == "xdai" {
 		cpool = &xdaiClientPool
 	} else {
-		return nil, errors.New("Unexisting blockchain provided")
+		return nil, errors.New("Unsupported blockchain provided")
 	}
 	return cpool, nil
 }
@ -59,7 +86,6 @@ func (client *Client) GetClientLastCallDiff() (lastCallTs int64) {
 // Find clint with same ID and update timestamp or
 // add new one if doesn't exist
 func (cpool *ClientPool) AddClientNode(id string, node *Node) {
-
 	if cpool.Client[id] != nil {
 		if reflect.DeepEqual(cpool.Client[id].Node, node) {
 			cpool.Client[id].UpdateClientLastCall()
--- a/nodes/node_balancer/cmd/data.go
+++ b/nodes/node_balancer/cmd/data.go
@ -1,59 +0,0 @@
-/*
-Data structure.
-*/
-package cmd
-
-import (
-	"net/http/httputil"
-	"net/url"
-	"sync"
-)
-
-type PingResponse struct {
-	Status string `json:"status"`
-}
-
-type NodeStatusResponse struct {
-	CurrentBlock uint64 `json:"current_block"`
-}
-
-// Node - which one node client worked with
-// LastCallTs - timestamp from last call
-type Client struct {
-	Node       *Node
-	LastCallTs int64
-
-	mux sync.RWMutex
-}
-
-type ClientPool struct {
-	Client map[string]*Client
-}
-
-// Node structure with
-// StatusURL for status server at node endpoint
-// GethURL for geth/bor/etc node http.server endpoint
-type Node struct {
-	StatusURL *url.URL
-	GethURL   *url.URL
-
-	Alive        bool
-	CurrentBlock uint64
-
-	mux sync.RWMutex
-
-	StatusReverseProxy *httputil.ReverseProxy
-	GethReverseProxy   *httputil.ReverseProxy
-}
-
-type NodePool struct {
-	Blockchain string
-	Nodes      []*Node
-
-	// Counter to observe all nodes
-	Current uint64
-}
-
-type BlockchainPool struct {
-	Blockchains []*NodePool
-}
--- a/nodes/node_balancer/cmd/db.go
+++ b/nodes/node_balancer/cmd/db.go
@ -0,0 +1,108 @@
+package cmd
+
+import (
+	"database/sql"
+	"fmt"
+
+	configs "github.com/bugout-dev/moonstream/nodes/node_balancer/configs"
+
+	_ "github.com/lib/pq"
+)
+
+var (
+	databaseClient DatabaseClient
+)
+
+type DatabaseClient struct {
+	Client *sql.DB
+}
+
+// Establish connection with database
+func InitDatabaseClient() error {
+	db, err := sql.Open("postgres", configs.MOONSTREAM_DB_URI_READ_ONLY)
+	if err != nil {
+		return fmt.Errorf("DSN parse error or another database initialization error: %v", err)
+	}
+
+	// Set the maximum number of concurrently idle connections,
+	// by default sql.DB allows a maximum of 2 idle connections.
+	db.SetMaxIdleConns(configs.MOONSTREAM_DB_MAX_IDLE_CONNS)
+
+	// Set the maximum lifetime of a connection.
+	// Longer lifetime increase memory usage.
+	db.SetConnMaxLifetime(configs.MOONSTREAM_DB_CONN_MAX_LIFETIME)
+
+	databaseClient = DatabaseClient{
+		Client: db,
+	}
+
+	return nil
+}
+
+type Block struct {
+	BlockNumber      uint64      `json:"block_number"`
+	Difficulty       uint64      `json:"difficulty"`
+	ExtraData        string      `json:"extra_data"`
+	GasLimit         uint64      `json:"gas_limit"`
+	GasUsed          uint64      `json:"gas_used"`
+	BaseFeePerGas    interface{} `json:"base_fee_per_gas"`
+	Hash             string      `json:"hash"`
+	LogsBloom        string      `json:"logs_bloom"`
+	Miner            string      `json:"miner"`
+	Nonce            string      `json:"nonce"`
+	ParentHash       string      `json:"parent_hash"`
+	ReceiptRoot      string      `json:"receipt_root"`
+	Uncles           string      `json:"uncles"`
+	Size             float64     `json:"size"`
+	StateRoot        string      `json:"state_root"`
+	Timestamp        uint64      `json:"timestamp"`
+	TotalDifficulty  string      `json:"total_difficulty"`
+	TransactionsRoot string      `json:"transactions_root"`
+
+	IndexedAt string `json:"indexed_at"`
+}
+
+// Get block from database
+func (dbc *DatabaseClient) GetBlock(blockchain string, blockNumber uint64) (Block, error) {
+	var block Block
+
+	// var tableName string
+	// if blockchain == "ethereum" {
+	// 	tableName = "ethereum_blocks"
+	// } else if blockchain == "polygon" {
+	// 	tableName = "polygon_blocks"
+	// } else {
+	// 	return block, fmt.Errorf("Unsupported blockchain")
+	// }
+	row := dbc.Client.QueryRow(
+		"SELECT block_number,difficulty,extra_data,gas_limit,gas_used,base_fee_per_gas,hash,logs_bloom,miner,nonce,parent_hash,receipt_root,uncles,size,state_root,timestamp,total_difficulty,transactions_root,indexed_at FROM ethereum_blocks WHERE block_number = $1",
+		// tableName,
+		blockNumber,
+	)
+
+	if err := row.Scan(
+		&block.BlockNumber,
+		&block.Difficulty,
+		&block.ExtraData,
+		&block.GasLimit,
+		&block.GasUsed,
+		&block.BaseFeePerGas,
+		&block.Hash,
+		&block.LogsBloom,
+		&block.Miner,
+		&block.Nonce,
+		&block.ParentHash,
+		&block.ReceiptRoot,
+		&block.Uncles,
+		&block.Size,
+		&block.StateRoot,
+		&block.Timestamp,
+		&block.TotalDifficulty,
+		&block.TransactionsRoot,
+		&block.IndexedAt,
+	); err != nil {
+		return block, err
+	}
+
+	return block, nil
+}
--- a/nodes/node_balancer/cmd/middleware.go
+++ b/nodes/node_balancer/cmd/middleware.go
@ -4,13 +4,59 @@ Server API middlewares.
 package cmd

 import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
 	"log"
 	"net"
 	"net/http"
+	"strings"
+
+	"github.com/bugout-dev/moonstream/nodes/node_balancer/configs"

 	humbug "github.com/bugout-dev/humbug/go/pkg"
 )

+// Extract access_id from header and query. Query takes precedence over header.
+func extractAccessID(r *http.Request) string {
+	var accessID string
+
+	accessIDHeaders := r.Header[strings.Title(configs.NB_ACCESS_ID_HEADER)]
+	for _, h := range accessIDHeaders {
+		accessID = h
+	}
+
+	queries := r.URL.Query()
+	for k, v := range queries {
+		if k == "access_id" {
+			accessID = v[0]
+		}
+	}
+
+	return accessID
+}
+
+// Extract data_source from header and query. Query takes precedence over header.
+func extractDataSource(r *http.Request) string {
+	dataSource := "database"
+
+	dataSources := r.Header[strings.Title(configs.NB_DATA_SOURCE_HEADER)]
+	for _, h := range dataSources {
+		dataSource = h
+	}
+
+	queries := r.URL.Query()
+	for k, v := range queries {
+		if k == "data_source" {
+			dataSource = v[0]
+		}
+	}
+
+	return dataSource
+}
+
 // Handle panic errors to prevent server shutdown
 func panicMiddleware(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
@ -31,12 +77,106 @@ func panicMiddleware(next http.Handler) http.Handler {
 // Log access requests in proper format
 func logMiddleware(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		body, err := ioutil.ReadAll(r.Body)
+		if err != nil {
+			http.Error(w, "Unable to read body", http.StatusBadRequest)
+			return
+		}
+		r.Body = ioutil.NopCloser(bytes.NewBuffer(body))
+		if len(body) > 0 {
+			defer r.Body.Close()
+		}
+
 		next.ServeHTTP(w, r)
+
 		ip, _, err := net.SplitHostPort(r.RemoteAddr)
 		if err != nil {
-			log.Printf("Unable to parse client IP: %s\n", r.RemoteAddr)
-		} else {
-			log.Printf("%s %s %s\n", ip, r.Method, r.URL.Path)
+			http.Error(w, fmt.Sprintf("Unable to parse client IP: %s", r.RemoteAddr), http.StatusBadRequest)
+			return
 		}
+		logStr := fmt.Sprintf("%s %s %s", ip, r.Method, r.URL.Path)
+
+		// Parse body and log method if jsonrpc path
+		pathSlice := strings.Split(r.URL.Path, "/")
+		if r.Method == "POST" && pathSlice[len(pathSlice)-1] == "jsonrpc" {
+			var jsonrpcRequest JSONRPCRequest
+			err = json.Unmarshal(body, &jsonrpcRequest)
+			if err != nil {
+				log.Printf("Unable to parse body %v", err)
+			}
+			logStr += fmt.Sprintf(" %s", jsonrpcRequest.Method)
+		}
+
+		if stateCLI.enableDebugFlag {
+			if r.URL.RawQuery != "" {
+				logStr += fmt.Sprintf(" %s", r.URL.RawQuery)
+			}
+			accessID := extractAccessID(r)
+			if accessID != "" {
+				dataSource := extractDataSource(r)
+				logStr += fmt.Sprintf(" %s %s", dataSource, accessID)
+			}
+		}
+		log.Printf("%s\n", logStr)
+	})
+}
+
+// Check access id was provided correctly and save user access configuration to request context
+func accessMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		var currentClientAccess ClientResourceData
+
+		accessID := extractAccessID(r)
+		dataSource := extractDataSource(r)
+
+		if accessID == "" {
+			http.Error(w, "No access id passed with request", http.StatusForbidden)
+			return
+		}
+
+		// If access id does not belong to internal crawlers, then find it in Bugout resources
+		if accessID == configs.NB_CONTROLLER_ACCESS_ID {
+			currentClientAccess = internalCrawlersAccess
+			currentClientAccess.dataSource = dataSource
+		} else {
+			resources, err := bugoutClient.Brood.GetResources(
+				configs.NB_CONTROLLER_TOKEN,
+				configs.NB_APPLICATION_ID,
+				map[string]string{"access_id": accessID},
+			)
+			if err != nil {
+				http.Error(w, "Unable to get user with provided access identifier", http.StatusForbidden)
+				return
+			}
+			if len(resources.Resources) == 0 {
+				http.Error(w, "User with provided access identifier not found", http.StatusForbidden)
+				return
+			}
+			resource_data, err := json.Marshal(resources.Resources[0].ResourceData)
+			if err != nil {
+				http.Error(w, "Unable to encode resource data interface to json", http.StatusInternalServerError)
+				return
+			}
+			var clientResourceData ClientResourceData
+			err = json.Unmarshal(resource_data, &clientResourceData)
+			if err != nil {
+				http.Error(w, "Unable to decode resource data json to structure", http.StatusInternalServerError)
+				return
+			}
+			currentClientAccess = ClientResourceData{
+				UserID:           clientResourceData.UserID,
+				AccessID:         clientResourceData.AccessID,
+				Name:             clientResourceData.Name,
+				Description:      clientResourceData.Description,
+				BlockchainAccess: clientResourceData.BlockchainAccess,
+				ExtendedMethods:  clientResourceData.ExtendedMethods,
+
+				dataSource: dataSource,
+			}
+		}
+
+		ctxUser := context.WithValue(r.Context(), "currentClientAccess", currentClientAccess)
+
+		next.ServeHTTP(w, r.WithContext(ctxUser))
 	})
 }
--- a/nodes/node_balancer/cmd/routes.go
+++ b/nodes/node_balancer/cmd/routes.go
@ -4,15 +4,22 @@ Handle routes for load balancer API.
 package cmd

 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"log"
 	"net/http"
+	"strconv"
 	"strings"

 	configs "github.com/bugout-dev/moonstream/nodes/node_balancer/configs"
 )

+type PingResponse struct {
+	Status string `json:"status"`
+}
+
 // pingRoute response with status of load balancer server itself
 func pingRoute(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "application/json")
@ -20,8 +27,20 @@ func pingRoute(w http.ResponseWriter, r *http.Request) {
 	json.NewEncoder(w).Encode(response)
 }

+func debugRoute(w http.ResponseWriter, r *http.Request) {
+	log.Printf("Clients: %v", ethereumClientPool)
+	return
+}
+
 // lbHandler load balances the incoming requests to nodes
 func lbHandler(w http.ResponseWriter, r *http.Request) {
+	currentClientAccessRaw := r.Context().Value("currentClientAccess")
+	currentClientAccess, ok := currentClientAccessRaw.(ClientResourceData)
+	if !ok {
+		http.Error(w, "Internal server error", http.StatusInternalServerError)
+		return
+	}
+
 	attempts := GetAttemptsFromContext(r)
 	if attempts > configs.NB_CONNECTION_RETRIES {
 		log.Printf("Max attempts reached from %s %s, terminating\n", r.RemoteAddr, r.URL.Path)
@ -42,13 +61,6 @@ func lbHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}

-	clientId := w.Header().Get(configs.MOONSTREAM_CLIENT_ID_HEADER)
-	if clientId == "" {
-		// TODO(kompotkot): After all internal crawlers and services start
-		// providing client id header, then replace to http.Error
-		clientId = "none"
-	}
-
 	// Chose one node
 	var node *Node
 	cpool, err := GetClientPool(blockchain)
@ -56,14 +68,14 @@ func lbHandler(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, fmt.Sprintf("Unacceptable blockchain provided %s", blockchain), http.StatusBadRequest)
 		return
 	}
-	node = cpool.GetClientNode(clientId)
+	node = cpool.GetClientNode(currentClientAccess.AccessID)
 	if node == nil {
 		node = blockchainPool.GetNextNode(blockchain)
 		if node == nil {
 			http.Error(w, "There are no nodes available", http.StatusServiceUnavailable)
 			return
 		}
-		cpool.AddClientNode(clientId, node)
+		cpool.AddClientNode(currentClientAccess.AccessID, node)
 	}

 	// Save origin path, to use in proxyErrorHandler if node will not response
@ -75,11 +87,73 @@ func lbHandler(w http.ResponseWriter, r *http.Request) {
 		node.StatusReverseProxy.ServeHTTP(w, r)
 		return
 	case strings.HasPrefix(r.URL.Path, fmt.Sprintf("/nb/%s/jsonrpc", blockchain)):
-		r.URL.Path = "/"
-		node.GethReverseProxy.ServeHTTP(w, r)
+		lbJSONRPCHandler(w, r, blockchain, node, currentClientAccess)
 		return
 	default:
 		http.Error(w, fmt.Sprintf("Unacceptable path for %s blockchain %s", blockchain, r.URL.Path), http.StatusBadRequest)
 		return
 	}
 }
+
+func lbJSONRPCHandler(w http.ResponseWriter, r *http.Request, blockchain string, node *Node, currentClientAccess ClientResourceData) {
+	body, err := ioutil.ReadAll(r.Body)
+	if err != nil {
+		http.Error(w, "Unable to read body", http.StatusBadRequest)
+		return
+	}
+	r.Body = ioutil.NopCloser(bytes.NewBuffer(body))
+
+	var jsonrpcRequest JSONRPCRequest
+	err = json.Unmarshal(body, &jsonrpcRequest)
+	if err != nil {
+		http.Error(w, "Unable to parse JSON RPC request", http.StatusBadRequest)
+		return
+	}
+
+	switch {
+	case currentClientAccess.dataSource == "blockchain":
+		if currentClientAccess.BlockchainAccess == false {
+			http.Error(w, "Access to blockchain node not allowed with provided access id", http.StatusForbidden)
+			return
+		}
+		if currentClientAccess.ExtendedMethods == false {
+			_, exists := ALLOWED_METHODS[jsonrpcRequest.Method]
+			if !exists {
+				http.Error(w, "Method for provided access id not allowed", http.StatusForbidden)
+				return
+			}
+		}
+
+		r.URL.Path = "/"
+		// If required detailed timeout configuration, define node.GethReverseProxy.Transport = &http.Transport{}
+		// as modified structure of DefaultTransport net/http/transport/DefaultTransport
+		node.GethReverseProxy.ServeHTTP(w, r)
+		return
+	case currentClientAccess.dataSource == "database":
+		// lbDatabaseHandler(w, r, blockchain, jsonrpcRequest)
+		http.Error(w, "Database access under development", http.StatusInternalServerError)
+		return
+	default:
+		http.Error(w, fmt.Sprintf("Unacceptable data source %s", currentClientAccess.dataSource), http.StatusBadRequest)
+		return
+	}
+}
+
+func lbDatabaseHandler(w http.ResponseWriter, r *http.Request, blockchain string, jsonrpcRequest JSONRPCRequest) {
+	switch {
+	case jsonrpcRequest.Method == "eth_getBlockByNumber":
+		var blockNumber uint64
+		blockNumber, _ = strconv.ParseUint(jsonrpcRequest.Params[0].(string), 10, 32)
+
+		block, err := databaseClient.GetBlock(blockchain, blockNumber)
+		if err != nil {
+			fmt.Printf("Unable to get block from database %v", err)
+			http.Error(w, fmt.Sprintf("no such block %v", blockNumber), http.StatusBadRequest)
+			return
+		}
+		fmt.Println(block)
+	default:
+		http.Error(w, fmt.Sprintf("Unsupported method %s by database, please use blockchain as data source", jsonrpcRequest.Method), http.StatusBadRequest)
+		return
+	}
+}
--- a/nodes/node_balancer/cmd/server.go
+++ b/nodes/node_balancer/cmd/server.go
@ -5,19 +5,27 @@ package cmd

 import (
 	"context"
+	"encoding/json"
 	"fmt"
 	"log"
 	"net/http"
 	"net/http/httputil"
 	"net/url"
+	"os"
 	"time"

-	humbug "github.com/bugout-dev/humbug/go/pkg"
 	configs "github.com/bugout-dev/moonstream/nodes/node_balancer/configs"
+
+	humbug "github.com/bugout-dev/humbug/go/pkg"
 	"github.com/google/uuid"
 )

-var reporter *humbug.HumbugReporter
+var (
+	internalCrawlersAccess ClientResourceData
+
+	// Crash reporter
+	reporter *humbug.HumbugReporter
+)

 // initHealthCheck runs a routine for check status of the nodes every 5 seconds
 func initHealthCheck(debug bool) {
@ -100,25 +108,72 @@ func Server() {
 	var err error
 	sessionID := uuid.New().String()
 	consent := humbug.CreateHumbugConsent(humbug.True)
-	reporter, err = humbug.CreateHumbugReporter(consent, "moonstream-node-balancer", sessionID, configs.HUMBUG_REPORTER_NODE_BALANCER_TOKEN)
+	reporter, err = humbug.CreateHumbugReporter(consent, "moonstream-node-balancer", sessionID, configs.HUMBUG_REPORTER_NB_TOKEN)
 	if err != nil {
-		panic(fmt.Sprintf("Invalid Humbug Crash configuration: %s", err.Error()))
+		fmt.Printf("Invalid Humbug Crash configuration: %v", err)
+		os.Exit(1)
 	}
 	// Record system information
 	reporter.Publish(humbug.SystemReport())

+	resources, err := bugoutClient.Brood.GetResources(
+		configs.NB_CONTROLLER_TOKEN,
+		configs.NB_APPLICATION_ID,
+		map[string]string{"access_id": configs.NB_CONTROLLER_ACCESS_ID},
+	)
+	if err != nil {
+		fmt.Printf("Unable to get user with provided access identifier %v", err)
+		os.Exit(1)
+	}
+	if len(resources.Resources) != 1 {
+		fmt.Printf("User with provided access identifier has wrong number of resources %v", err)
+		os.Exit(1)
+	}
+	resource_data, err := json.Marshal(resources.Resources[0].ResourceData)
+	if err != nil {
+		fmt.Printf("Unable to encode resource data interface to json %v", err)
+		os.Exit(1)
+	}
+	var clientAccess ClientResourceData
+	err = json.Unmarshal(resource_data, &clientAccess)
+	if err != nil {
+		fmt.Printf("Unable to decode resource data json to structure %v", err)
+		os.Exit(1)
+	}
+	internalCrawlersAccess = ClientResourceData{
+		UserID:           clientAccess.UserID,
+		AccessID:         clientAccess.AccessID,
+		Name:             clientAccess.Name,
+		Description:      clientAccess.Description,
+		BlockchainAccess: clientAccess.BlockchainAccess,
+		ExtendedMethods:  clientAccess.ExtendedMethods,
+	}
+	log.Printf(
+		"Internal crawlers access set, resource id: %s, blockchain access: %t, extended methods: %t",
+		resources.Resources[0].Id, clientAccess.BlockchainAccess, clientAccess.ExtendedMethods,
+	)
+
+	err = InitDatabaseClient()
+	if err != nil {
+		log.Printf("Unable to initialize database connection %v\n", err)
+	} else {
+		log.Printf("Connection with database established\n")
+	}
+
 	// Fill NodeConfigList with initial nodes from environment variables
-	configs.ConfigList.InitNodeConfigList(stateCLI.configPathFlag)
+	nodeConfigs.InitNodeConfigList(stateCLI.configPathFlag)

 	// Parse nodes and set list of proxies
-	for i, nodeConfig := range configs.ConfigList.Configs {
+	for i, nodeConfig := range nodeConfigs.NodeConfigs {
 		gethUrl, err := url.Parse(fmt.Sprintf("http://%s:%d", nodeConfig.Addr, nodeConfig.Port))
 		if err != nil {
-			log.Fatal(err)
+			fmt.Printf("Unable to parse gethUrl with addr: %s and port: %d\n", nodeConfig.Addr, nodeConfig.Port)
+			continue
 		}
 		statusUrl, err := url.Parse(fmt.Sprintf("http://%s:%s", nodeConfig.Addr, configs.MOONSTREAM_NODES_SERVER_PORT))
 		if err != nil {
-			log.Fatal(err)
+			fmt.Printf("Unable to parse statusUrl with addr: %s and port: %s\n", nodeConfig.Addr, configs.MOONSTREAM_NODES_SERVER_PORT)
+			continue
 		}

 		proxyToStatus := httputil.NewSingleHostReverseProxy(statusUrl)
@ -135,13 +190,17 @@ func Server() {
 			GethReverseProxy:   proxyToGeth,
 		}, nodeConfig.Blockchain)
 		log.Printf(
-			"Added new %s proxy %d with geth url: %s and status url: %s\n",
+			"Added new %s proxy blockchain under index %d from config file with geth url: %s and status url: %s\n",
 			nodeConfig.Blockchain, i, gethUrl, statusUrl)
 	}

 	serveMux := http.NewServeMux()
+	serveMux.Handle("/nb/", accessMiddleware(http.HandlerFunc(lbHandler)))
+	log.Println("Authentication middleware enabled")
+	if stateCLI.enableDebugFlag {
+		serveMux.HandleFunc("/debug", debugRoute)
+	}
 	serveMux.HandleFunc("/ping", pingRoute)
-	serveMux.HandleFunc("/nb/", lbHandler)

 	// Set common middlewares, from bottom to top
 	commonHandler := logMiddleware(serveMux)
@ -150,18 +209,20 @@ func Server() {
 	server := http.Server{
 		Addr:         fmt.Sprintf("%s:%s", stateCLI.listeningAddrFlag, stateCLI.listeningPortFlag),
 		Handler:      commonHandler,
-		ReadTimeout:  10 * time.Second,
-		WriteTimeout: 10 * time.Second,
+		ReadTimeout:  40 * time.Second,
+		WriteTimeout: 40 * time.Second,
 	}

 	// Start node health checking and current block fetching
+	blockchainPool.HealthCheck()
 	if stateCLI.enableHealthCheckFlag {
 		go initHealthCheck(stateCLI.enableDebugFlag)
 	}

-	log.Printf("Starting server at %s:%s\n", stateCLI.listeningAddrFlag, stateCLI.listeningPortFlag)
+	log.Printf("Starting node load balancer HTTP server at %s:%s\n", stateCLI.listeningAddrFlag, stateCLI.listeningPortFlag)
 	err = server.ListenAndServe()
 	if err != nil {
-		log.Fatal(err)
+		fmt.Printf("Failed to start server listener %v", err)
+		os.Exit(1)
 	}
 }
--- a/nodes/node_balancer/configs/settings.go
+++ b/nodes/node_balancer/configs/settings.go
@ -4,82 +4,82 @@ Configurations for load balancer server.
 package configs

 import (
-	"io/ioutil"
+	"fmt"
 	"log"
 	"os"
-	"strconv"
-	"strings"
 	"time"
 )

-type BlockchainConfig struct {
-	Blockchain string
-	IPs        []string
-	Port       string
-}
+var (
+	// Bugout and application configuration
+	BUGOUT_AUTH_URL          = os.Getenv("BUGOUT_AUTH_URL")
+	BUGOUT_AUTH_CALL_TIMEOUT = time.Second * 5
+	NB_APPLICATION_ID        = os.Getenv("NB_APPLICATION_ID")
+	NB_CONTROLLER_TOKEN      = os.Getenv("NB_CONTROLLER_TOKEN")
+	NB_CONTROLLER_ACCESS_ID  = os.Getenv("NB_CONTROLLER_ACCESS_ID")

-type NodeConfig struct {
-	Blockchain string
-	Addr       string
-	Port       uint16
-}
+	NB_CONNECTION_RETRIES          = 2
+	NB_CONNECTION_RETRIES_INTERVAL = time.Millisecond * 10
+	NB_HEALTH_CHECK_INTERVAL       = time.Second * 5
+	NB_HEALTH_CHECK_CALL_TIMEOUT   = time.Second * 2

-type NodeConfigList struct {
-	Configs []NodeConfig
-}
+	// Client configuration
+	NB_CLIENT_NODE_KEEP_ALIVE = int64(5) // How long to store node in hot list for client in seconds

-var ConfigList NodeConfigList
+	NB_ACCESS_ID_HEADER   = os.Getenv("NB_ACCESS_ID_HEADER")
+	NB_DATA_SOURCE_HEADER = os.Getenv("NB_DATA_SOURCE_HEADER")
+
+	// Humbug configuration
+	HUMBUG_REPORTER_NB_TOKEN = os.Getenv("HUMBUG_REPORTER_NB_TOKEN")
+
+	// Database configuration
+	MOONSTREAM_DB_URI_READ_ONLY         = os.Getenv("MOONSTREAM_DB_URI_READ_ONLY")
+	MOONSTREAM_DB_MAX_IDLE_CONNS    int = 30
+	MOONSTREAM_DB_CONN_MAX_LIFETIME     = 30 * time.Minute
+)

 var MOONSTREAM_NODES_SERVER_PORT = os.Getenv("MOONSTREAM_NODES_SERVER_PORT")
-var MOONSTREAM_CLIENT_ID_HEADER = os.Getenv("MOONSTREAM_CLIENT_ID_HEADER")

-func checkEnvVarSet() {
-	if MOONSTREAM_CLIENT_ID_HEADER == "" {
-		MOONSTREAM_CLIENT_ID_HEADER = "x-moonstream-client-id"
+func CheckEnvVarSet() {
+	if NB_ACCESS_ID_HEADER == "" {
+		NB_ACCESS_ID_HEADER = "x-node-balancer-access-id"
+	}
+	if NB_DATA_SOURCE_HEADER == "" {
+		NB_DATA_SOURCE_HEADER = "x-node-balancer-data-source"
 	}

 	if MOONSTREAM_NODES_SERVER_PORT == "" {
-		log.Fatal("Environment variable MOONSTREAM_NODES_SERVER_PORT not set")
+		fmt.Println("Environment variable MOONSTREAM_NODES_SERVER_PORT not set")
+		os.Exit(1)
 	}
 }

-// Return list of NodeConfig structures
-func (nc *NodeConfigList) InitNodeConfigList(configPath string) {
-	checkEnvVarSet()
-
-	rawBytes, err := ioutil.ReadFile(configPath)
+func GenerateDefaultConfig() string {
+	homeDir, err := os.UserHomeDir()
 	if err != nil {
-		log.Fatalf("Unable to read config file, %v", err)
+		fmt.Printf("Unable to find user home directory, %v", err)
+		os.Exit(1)
 	}
-	text := string(rawBytes)
-	lines := strings.Split(text, "\n")

-	// Define available blockchain nodes
-	for _, line := range lines {
-		fields := strings.Split(line, ",")
-		if len(fields) == 3 {
-			port, err := strconv.ParseInt(fields[2], 0, 16)
-			if err != nil {
-				log.Printf("Unable to parse port number, %v", err)
-				continue
-			}
+	configDirPath := fmt.Sprintf("%s/.nodebalancer", homeDir)
+	configPath := fmt.Sprintf("%s/config.txt", configDirPath)

-			nc.Configs = append(nc.Configs, NodeConfig{
-				Blockchain: fields[0],
-				Addr:       fields[1],
-				Port:       uint16(port),
-			})
+	err = os.MkdirAll(configDirPath, os.ModePerm)
+	if err != nil {
+		fmt.Printf("Unable to create directory, %v", err)
+		os.Exit(1)
+	}
+
+	_, err = os.Stat(configPath)
+	if err != nil {
+		tempConfigB := []byte("ethereum,127.0.0.1,8545")
+		err = os.WriteFile(configPath, tempConfigB, 0644)
+		if err != nil {
+			fmt.Printf("Unable to create directory, %v", err)
+			os.Exit(1)
 		}
+		log.Printf("Config directory were not found, created default configuration at %s", configPath)
 	}
+
+	return configPath
 }
-
-var NB_CONNECTION_RETRIES = 2
-var NB_CONNECTION_RETRIES_INTERVAL = time.Millisecond * 10
-var NB_HEALTH_CHECK_INTERVAL = time.Second * 5
-var NB_HEALTH_CHECK_CALL_TIMEOUT = time.Second * 2
-
-// Client config
-var NB_CLIENT_NODE_KEEP_ALIVE = int64(5) // How long to store node in hot list for client in seconds
-
-// Humbug config
-var HUMBUG_REPORTER_NODE_BALANCER_TOKEN = os.Getenv("HUMBUG_REPORTER_NODE_BALANCER_TOKEN")
--- a/nodes/node_balancer/configs/version.go
+++ b/nodes/node_balancer/configs/version.go
@ -1,3 +1,3 @@
 package configs

-var NB_VERSION = "0.0.2"
+var NB_VERSION = "0.1.0"
--- a/nodes/node_balancer/go.mod
+++ b/nodes/node_balancer/go.mod
@ -3,6 +3,8 @@ module github.com/bugout-dev/moonstream/nodes/node_balancer
 go 1.17

 require (
+	github.com/bugout-dev/bugout-go v0.3.4
 	github.com/bugout-dev/humbug/go v0.0.0-20211206230955-57607cd2d205
 	github.com/google/uuid v1.3.0
+	github.com/lib/pq v1.10.4
 )
--- a/nodes/node_balancer/go.sum
+++ b/nodes/node_balancer/go.sum
@ -1,4 +1,291 @@
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--- a/nodes/node_balancer/sample.env
+++ b/nodes/node_balancer/sample.env
@ -1,15 +1,10 @@
 # Required environment variables for load balancer
+export BUGOUT_AUTH_URL="https://auth.bugout.dev"
+export NB_APPLICATION_ID="<application_id_to_controll_access>"
+export NB_CONTROLLER_TOKEN="<token_of_controller_user>"
+export NB_CONTROLLER_ACCESS_ID="<controller_access_id_for_internal_crawlers>"
+export MOONSTREAM_DB_URI="postgresql://<username>:<password>@<db_host>:<db_port>/<db_name>"
 export MOONSTREAM_NODES_SERVER_PORT="<node_status_server_port>"
+
+# Error humbug reporter
 export HUMBUG_REPORTER_NODE_BALANCER_TOKEN="<bugout_humbug_token_for_crash_reports>"
-
-# Ethereum nodes depends variables
-export MOONSTREAM_NODE_ETHEREUM_IPC_PORT="<node_geth_http_port>"
-
-export MOONSTREAM_NODE_ETHEREUM_A_IPC_ADDR="<node_geth_http_ip_addr>"
-export MOONSTREAM_NODE_ETHEREUM_B_IPC_ADDR="<node_geth_http_ip_addr>"
-
-# Polygon nodes depends variables
-export MOONSTREAM_NODE_POLYGON_IPC_PORT="<node_bor_http_port>"
-
-export MOONSTREAM_NODE_POLYGON_A_IPC_ADDR="<node_bor_http_ip_addr>"
-export MOONSTREAM_NODE_POLYGON_B_IPC_ADDR="<node_bor_http_ip_addr>"