fix: Convert big integers to float64

Large numbers can be returned by the Flexpool API reaching the `int64`
limit. Blocks reward were seen as 0 ETH. Using `float64` instead. Also
converting signed int64 to unsigned int64 for non-timestamp numbers.

BREAKING CHANGE: please follow the upgrades instructions from 1.2 to
1.3 to convert such types in the database.

Signed-off-by: Julien Riou <julien@riou.xyz>

UPGRADES.md

@@ -1,9 +1,19 @@
+# General notes
+
+In the next commands, you should replace `flexassistant.db` by the content of the `database_file` setting if it's has been changed.
+
+# 1.2 to 1.3
+
+The balance has reached maximum of **int64** type so the column should be converted to **real** to handle large numbers:
+
+```
+sqlite3 flexassistant.db < migrations/1.2_to_1.3.sql
+```
+
 # 1.0 to 1.1
 
 Some numeric types have been updated from **float64** to **int64**. Upgrade the database types by running the following migration:
 
 ```
 sqlite3 flexassistant.db < migrations/1.0_to_1.1.sql
-```
-
-And replace `flexassistant.db` by the content of the `database_file` setting if it's has been changed.
+```

client.go

@@ -66,12 +66,12 @@ func (f *FlexpoolClient) request(url string) ([]byte, error) {
 type BalanceResponse struct {
 	Error  string `json:"error"`
 	Result struct {
-		Balance int64 `json:"balance"`
+		Balance float64 `json:"balance"`
 	} `json:"result"`
 }
 
 // MinerBalance returns the current unpaid balance
-func (f *FlexpoolClient) MinerBalance(coin string, address string) (int64, error) {
+func (f *FlexpoolClient) MinerBalance(coin string, address string) (float64, error) {
 	body, err := f.request(fmt.Sprintf("%s/miner/balance?coin=%s&address=%s", FlexpoolAPIURL, coin, address))
 	if err != nil {
 		return 0, err
@@ -87,9 +87,9 @@ type PaymentsResponse struct {
 	Error  string `json:"error"`
 	Result struct {
 		Data []struct {
-			Hash      string `json:"hash"`
-			Value     int64  `json:"value"`
-			Timestamp int64  `json:"timestamp"`
+			Hash      string  `json:"hash"`
+			Value     float64 `json:"value"`
+			Timestamp int64   `json:"timestamp"`
 		} `json:"data"`
 	} `json:"result"`
 }
@@ -165,9 +165,9 @@ type BlocksResponse struct {
 	Error  string `json:"error"`
 	Result struct {
 		Data []struct {
-			Hash   string `json:"hash"`
-			Number int64  `json:"number"`
-			Reward int64  `json:"reward"`
+			Hash   string  `json:"hash"`
+			Number uint64  `json:"number"`
+			Reward float64 `json:"reward"`
 		} `json:"data"`
 	} `json:"result"`
 }

main.go

@@ -132,7 +132,7 @@ func main() {
 				log.Warnf("Could not fetch unpaid balance: %v", err)
 				continue
 			}
-			log.Debugf("Unpaid balance %d", balance)
+			log.Debugf("Unpaid balance %.0f", balance)
 			miner.Balance = balance
 			if miner.Balance != dbMiner.Balance {
 				dbMiner.Balance = balance

migrations/1.2_to_1.3.sql

@@ -0,0 +1,28 @@
+-- Migrate from 1.2 to 1.3
+-- SQLite doesn't support ALTER TABLE... ALTER TYPE
+-- This migration file creates the new structures with "real" types
+-- instead of "integer", move data to this new table then drop the old one.
+
+-- miners
+
+ALTER TABLE `miners` RENAME TO `miners_old`;
+
+CREATE TABLE `miners` (
+    `id` integer,
+    `created_at` datetime,
+    `updated_at` datetime,
+    `deleted_at` datetime,
+    `coin` text,
+    `address` text NOT NULL UNIQUE,
+    `balance` real,
+    `last_payment_timestamp` integer,
+    PRIMARY KEY (`id`)
+);
+
+INSERT INTO `miners` SELECT * FROM `miners_old`;
+
+DROP TABLE `miners_old`;
+
+CREATE INDEX `idx_miners_deleted_at` ON `miners`(`deleted_at`);
+
+SELECT "Database migrated to 1.3"

miner.go

@@ -19,7 +19,7 @@ type Miner struct {
 	gorm.Model
 	Coin                 string
 	Address              string `gorm:"unique;not null"`
-	Balance              int64
+	Balance              float64
 	LastPaymentTimestamp int64
 }
 
@@ -56,12 +56,12 @@ func (m *Miner) String() string {
 // Payment to store payment attributes
 type Payment struct {
 	Hash      string
-	Value     int64
+	Value     float64
 	Timestamp int64
 }
 
 // NewPayment creates a Payment
-func NewPayment(hash string, value int64, timestamp int64) *Payment {
+func NewPayment(hash string, value float64, timestamp int64) *Payment {
 	return &Payment{
 		Hash:      hash,
 		Value:     value,

pool.go

@@ -10,7 +10,7 @@ import (
 type Pool struct {
 	gorm.Model
 	Coin            string `gorm:"unique;not null"`
-	LastBlockNumber int64
+	LastBlockNumber uint64
 }
 
 // NewPool creates a Pool
@@ -25,13 +25,13 @@ func (p *Pool) String() string {
 
 // Block to store block attributes
 type Block struct {
-	Hash   string `gorm:"unique;not null"`
-	Number int64  `gorm:"not null"`
-	Reward int64  `gorm:"not null"`
+	Hash   string  `gorm:"unique;not null"`
+	Number uint64  `gorm:"not null"`
+	Reward float64 `gorm:"not null"`
 }
 
 // NewBlock creates a Block
-func NewBlock(hash string, number int64, reward int64) *Block {
+func NewBlock(hash string, number uint64, reward float64) *Block {
 	return &Block{
 		Hash:   hash,
 		Number: number,

utils.go

@@ -12,7 +12,7 @@ const MojoToXCHDivider = 1000000000000
 
 // ConvertCurrency divides the smallest unit of the currency to the currency itself
 // Example: for "eth", convert from Weis to ETH
-func ConvertCurrency(coin string, value int64) (float64, error) {
+func ConvertCurrency(coin string, value float64) (float64, error) {
 	switch coin {
 	case "eth":
 		return ConvertWeis(value), nil
@@ -24,13 +24,13 @@ func ConvertCurrency(coin string, value int64) (float64, error) {
 }
 
 // ConvertWeis converts the value from Weis to ETH
-func ConvertWeis(value int64) float64 {
-	return float64(value) / WeisToETHDivider
+func ConvertWeis(value float64) float64 {
+	return value / WeisToETHDivider
 }
 
 // ConvertMojo converts the value from Mojo to XCH
-func ConvertMojo(value int64) float64 {
-	return float64(value) / MojoToXCHDivider
+func ConvertMojo(value float64) float64 {
+	return value / MojoToXCHDivider
 }
 
 // ConvertAction returns "Miner" for Ethereum and "Farmer" for Chia