add support for bitcoin

bitcoin/address.go

@@ -0,0 +1,37 @@
+package bitcoin
+
+import (
+	"fmt"
+	"net/url"
+)
+
+type Address struct {
+	Address    string `json:"address"`
+	ChainStats struct {
+		FundedTxoCount int `json:"funded_txo_count"`
+		FundedTxoSum   int `json:"funded_txo_sum"`
+		SpentTxoCount  int `json:"spent_txo_count"`
+		SpentTxoSum    int `json:"spent_txo_sum"`
+		TxCount        int `json:"tx_count"`
+	} `json:"chain_stats"`
+	MempoolStats struct {
+		FundedTxoCount int `json:"funded_txo_count"`
+		FundedTxoSum   int `json:"funded_txo_sum"`
+		SpentTxoCount  int `json:"spent_txo_count"`
+		SpentTxoSum    int `json:"spent_txo_sum"`
+		TxCount        int `json:"tx_count"`
+	} `json:"mempool_stats"`
+}
+
+// GetAddress returns an Address struct populated with data from blockstream.info
+// for a given BTC address
+func (c *Client) GetAddress(address string) (*Address, error) {
+	addressResponse := &Address{}
+
+	err := c.get(fmt.Sprintf("address/%s", address), addressResponse, url.Values{})
+	if err != nil {
+		return nil, err
+	}
+
+	return addressResponse, nil
+}

bitcoin/client.go

@@ -0,0 +1,81 @@
+package bitcoin
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"time"
+)
+
+const apiBaseURL = "https://blockstream.info/api/"
+
+// A client is the structure that will be used to consume the API
+// endpoints. It holds the login credentials, http client/transport,
+// rate limit information, and the login session timer.
+type Client struct {
+	httpClient *http.Client
+	transport  *http.Transport
+}
+
+// Send an HTTP GET request, and return the processed response
+func (c *Client) get(endpoint string, out interface{}, query url.Values) error {
+	req, err := http.NewRequest("GET", apiBaseURL+endpoint+"?"+query.Encode(), nil)
+	if err != nil {
+		return fmt.Errorf("failed to create new GET request: %v", err)
+	}
+
+	res, err := c.httpClient.Do(req)
+	if err != nil {
+		return fmt.Errorf("http GET request failed: %v", err)
+	}
+
+	err = c.processResponse(res, out)
+	if err != nil {
+		return fmt.Errorf("failed to process response: %v", err)
+	}
+	return nil
+}
+
+// processResponse takes the body of an HTTP response, and either returns
+// the error code, or unmarshalls the JSON response, extracts
+// rate limit info, and places it into the object
+// output parameter. This function closes the response body after reading it.
+func (c *Client) processResponse(res *http.Response, out interface{}) error {
+	body, err := io.ReadAll(res.Body)
+	res.Body.Close()
+	if err != nil {
+		return fmt.Errorf("failed to read response body: %v", err)
+	}
+
+	if res.StatusCode != 200 && res.StatusCode != 201 {
+		return fmt.Errorf("unexpected http status code '%d': %v", res.StatusCode, err)
+	}
+
+	err = json.Unmarshal(body, out)
+	if err != nil {
+		return fmt.Errorf("failed to unmarshal response body: %v", err)
+	}
+
+	return nil
+}
+
+// NewClient is the factory function for clients
+func NewClient() (*Client, error) {
+	transport := &http.Transport{
+		ResponseHeaderTimeout: 5 * time.Second,
+	}
+
+	client := &http.Client{
+		Transport: transport,
+	}
+
+	// Create a new client
+	c := &Client{
+		httpClient: client,
+		transport:  transport,
+	}
+
+	return c, nil
+}

bitcoin/fiat.go

@@ -0,0 +1,43 @@
+package bitcoin
+
+import (
+	"fmt"
+	"net/http"
+)
+
+// example: https://api.coinconvert.net/convert/btc/cad?amount=1
+const fiatConvertURL = "https://api.coinconvert.net/convert/btc/cad"
+
+type FiatConversion struct {
+	Status string  `json:"status"`
+	BTC    int     `json:"BTC"`
+	CAD    float64 `json:"CAD"`
+}
+
+// BTC to CAD FIAT conversion - accepts an
+// amount in satoshi's and returns a CAD amount * 1000
+func (c *Client) ConvertBTCToCAD(amount int) (int, error) {
+
+	fiatConversion := &FiatConversion{}
+
+	req, err := http.NewRequest("GET", fiatConvertURL+"?amount=1", nil)
+	if err != nil {
+		return 0, fmt.Errorf("failed to create new GET request: %v", err)
+	}
+
+	res, err := c.httpClient.Do(req)
+	if err != nil {
+		return 0, fmt.Errorf("http GET request failed: %v", err)
+	}
+
+	err = c.processResponse(res, fiatConversion)
+	if err != nil {
+		return 0, fmt.Errorf("failed to process response: %v", err)
+	}
+
+	if fiatConversion.Status != "success" {
+		return 0, fmt.Errorf("fiat conversion status was '%s' but expected 'success'", fiatConversion.Status)
+	}
+
+	return (amount * int(fiatConversion.CAD*1000)) / 100000000, nil // one BTC = one hundred million satoshi's
+}

main.go

@@ -7,6 +7,7 @@ import (
 	"strconv"
 	"time"
 
+	"deadbeef.codes/steven/ynab-portfolio-monitor/bitcoin"
 	"deadbeef.codes/steven/ynab-portfolio-monitor/questrade"
 	"deadbeef.codes/steven/ynab-portfolio-monitor/ynab"
 )
@@ -15,8 +16,11 @@ var (
 	persistentData          *PersistentData
 	questradeClient         *questrade.Client
 	ynabClient              *ynab.Client
+	bitcoinClient           *bitcoin.Client
 	questradeAccountIDs     []int
-	ynabAccountIDs      []string
+	questradeYnabAccountIDs []string
+	bitcoinAddresses        []string
+	bitcoinYnabAccountID    string
 )
 
 func init() {
@@ -27,6 +31,7 @@ func init() {
 	envVars["questrade_refresh_token"] = os.Getenv("questrade_refresh_token")
 	envVars["ynab_secret"] = os.Getenv("ynab_secret")
 	envVars["ynab_budget_id"] = os.Getenv("ynab_budget_id")
+	envVars["bitcoin_ynab_account"] = os.Getenv("bitcoin_ynab_account")
 
 	// Validate that all required environment variables are set
 	for key, value := range envVars {
@@ -35,6 +40,9 @@ func init() {
 		}
 	}
 
+	// questrade
+	questradeAccountIDs = make([]int, 0)
+	questradeYnabAccountIDs = make([]string, 0)
 	for i := 0; true; i++ {
 		questradeAccountIDString := os.Getenv(fmt.Sprintf("questrade_account_%d", i))
 		ynabAccountID := os.Getenv(fmt.Sprintf("questrade_ynab_account_%d", i))
@@ -47,9 +55,20 @@ func init() {
 			log.Fatalf("failed to convert environment variable questrade_account_%d with value of '%s' to integer: %v", i, questradeAccountIDString, err)
 		}
 		questradeAccountIDs = append(questradeAccountIDs, questradeAccountID)
-		ynabAccountIDs = append(ynabAccountIDs, ynabAccountID)
+		questradeYnabAccountIDs = append(questradeYnabAccountIDs, ynabAccountID)
 	}
 
+	// bitcoin
+	bitcoinAddresses = make([]string, 0)
+	for i := 0; true; i++ {
+		bitcoinAddress := os.Getenv(fmt.Sprintf("bitcoin_address_%d", i))
+		if bitcoinAddress == "" {
+			break
+		}
+		bitcoinAddresses = append(bitcoinAddresses, bitcoinAddress)
+	}
+	bitcoinYnabAccountID = envVars["bitcoin_ynab_account"]
+
 	// Load persistent data
 	var err error
 	persistentData, err = loadPersistentData()
@@ -62,6 +81,12 @@ func init() {
 	if err != nil {
 		log.Fatalf("failed to create ynab client: %v", err)
 	}
+
+	bitcoinClient, err = bitcoin.NewClient()
+	if err != nil {
+		log.Fatalf("failed to create bitcoin client: %v", err)
+	}
+
 }
 
 func main() {
@@ -90,8 +115,12 @@ func main() {
 		}
 
 		// Update Bitcoin account
+		err = syncBitoin()
+		if err != nil {
+			log.Fatalf("failed to sync bitcoin to ynab: %v", err)
+		}
 
-		// Update ComputerShare account
+		// TBD: Update ComputerShare account
 
 		log.Print("Sleeping for 6 hours...")
 		time.Sleep(time.Hour * 6)
@@ -108,40 +137,36 @@ func syncQuestrade() error {
 			return fmt.Errorf("failed to get questrade account balance for account ID '%d': %v", questradeAccountID, err)
 		}
 
-		ynabTransactionID, ynabTransactionAmount, err := ynabClient.GetTodayYnabCapitalGainsTransaction(ynabAccountIDs[i])
+		err = ynabClient.SetAccountBalance(questradeYnabAccountIDs[i], questradeBalance)
 		if err != nil {
-			return fmt.Errorf("failed to get ynab capital gains transaction ID: %v", err)
+			return fmt.Errorf("failed to set YNAB account balance: %v", err)
-		}
-
-		ynabAccount, err := ynabClient.GetAccount(ynabAccountIDs[i])
-		if err != nil {
-			return fmt.Errorf("failed to get ynab account with id '%s': %v", ynabAccountIDs[i], err)
-		}
-
-		balanceDelta := questradeBalance - ynabAccount.Data.Account.Balance
-		balanceDelta += ynabTransactionAmount // Take into account the existing transaction
-
-		if balanceDelta == 0 {
-			continue // If balanceDelta is 0 do not create a transaction i.e. market is closed today
-		}
-
-		if ynabTransactionID == "" {
-			// there is no transaction - so create a new one
-			err = ynabClient.CreateTodayYNABCapitalGainsTransaction(ynabAccountIDs[i], balanceDelta)
-			if err != nil {
-				return fmt.Errorf("failed to create YNAB capital gains transaction for account ID '%s': %v", ynabAccountIDs[i], err)
-			}
-			log.Printf("Creating new capital gains transaction for YNAB account '%s' for amount: %d", ynabAccountIDs[i], balanceDelta)
-
-		} else {
-			// there is an existing transaction - so update the existing one
-			err = ynabClient.UpdateTodayYNABCapitalGainsTransaction(ynabAccountIDs[i], ynabTransactionID, balanceDelta)
-			if err != nil {
-				return fmt.Errorf("failed to update YNAB capital gains transaction for account ID '%s': %v", ynabAccountIDs[i], err)
-			}
-			log.Printf("Updating existing capital gains transaction for YNAB account '%s' for amount: %d", ynabAccountIDs[i], balanceDelta)
 		}
 	}
 
 	return nil
 }
+
+func syncBitoin() error {
+
+	var satoshiBalance int
+	for _, bitcoinAddress := range bitcoinAddresses {
+		addressResponse, err := bitcoinClient.GetAddress(bitcoinAddress)
+		if err != nil {
+			return fmt.Errorf("failed to get bitcoin address '%s': %v", bitcoinAddress, err)
+		}
+
+		satoshiBalance += addressResponse.ChainStats.FundedTxoSum - addressResponse.ChainStats.SpentTxoSum
+	}
+
+	fiatBalance, err := bitcoinClient.ConvertBTCToCAD(satoshiBalance)
+	if err != nil {
+		return fmt.Errorf("failed to convert satoshi balance to fiat balance: %v", err)
+	}
+
+	err = ynabClient.SetAccountBalance(bitcoinYnabAccountID, fiatBalance)
+	if err != nil {
+		return fmt.Errorf("failed to set YNAB account balance: %v", err)
+	}
+
+	return nil
+}

ynab/accounts.go

@@ -2,6 +2,7 @@ package ynab
 
 import (
 	"fmt"
+	"log"
 	"net/url"
 )
 
@@ -38,3 +39,43 @@ func (c *Client) GetAccount(accountID string) (*Accounts, error) {
 
 	return &response, nil
 }
+
+// Creates a "Capital Gains or Losses" adjustment transaction or updates an existing one if it exists to ensure the account balance
+// for the accountID provided equals the balance provided
+func (c *Client) SetAccountBalance(accountID string, balance int) error {
+
+	ynabTransactionID, ynabTransactionAmount, err := c.getTodayYnabCapitalGainsTransaction(accountID)
+	if err != nil {
+		return fmt.Errorf("failed to get ynab capital gains transaction ID: %v", err)
+	}
+
+	ynabAccount, err := c.GetAccount(accountID)
+	if err != nil {
+		return fmt.Errorf("failed to get ynab account with id '%s': %v", accountID, err)
+	}
+
+	balanceDelta := balance - ynabAccount.Data.Account.Balance
+	balanceDelta += ynabTransactionAmount // Take into account the existing transaction
+
+	if balanceDelta == 0 {
+		return nil // If balanceDelta is 0 do not create a transaction i.e. market is closed today
+	}
+
+	if ynabTransactionID == "" {
+		// there is no transaction - so create a new one
+		err = c.createTodayYNABCapitalGainsTransaction(accountID, balanceDelta)
+		if err != nil {
+			return fmt.Errorf("failed to create YNAB capital gains transaction for account ID '%s': %v", accountID, err)
+		}
+		log.Printf("Creating new capital gains transaction for YNAB account '%s' for amount: %d", accountID, balanceDelta)
+
+	} else {
+		// there is an existing transaction - so update the existing one
+		err = c.updateTodayYNABCapitalGainsTransaction(accountID, ynabTransactionID, balanceDelta)
+		if err != nil {
+			return fmt.Errorf("failed to update YNAB capital gains transaction for account ID '%s': %v", accountID, err)
+		}
+		log.Printf("Updating existing capital gains transaction for YNAB account '%s' for amount: %d", accountID, balanceDelta)
+	}
+	return nil
+}

ynab/transactions.go

@@ -70,7 +70,7 @@ func (c *Client) GetAccountTransactions(accountID string, sinceDate time.Time) (
 
 // Accepts a YNAB account ID and returns the transaction ID, amount and an error for the
 // the first transaction found with Payee Name "Capital Gains or Losses"
-func (c *Client) GetTodayYnabCapitalGainsTransaction(accountID string) (string, int, error) {
+func (c *Client) getTodayYnabCapitalGainsTransaction(accountID string) (string, int, error) {
 	ynabTransactions, err := c.GetAccountTransactions(accountID, time.Now())
 	if err != nil {
 		return "", 0, fmt.Errorf("failed to get ynab transactions: %v", err)
@@ -87,7 +87,7 @@ func (c *Client) GetTodayYnabCapitalGainsTransaction(accountID string) (string,
 }
 
 // Accepts a YNAB account ID and transaction amount and creates a new YNAB transaction
-func (c *Client) CreateTodayYNABCapitalGainsTransaction(accountID string, amount int) error {
+func (c *Client) createTodayYNABCapitalGainsTransaction(accountID string, amount int) error {
 	transaction := TransactionRequest{}
 	transaction.Transaction.AccountID = accountID
 	transaction.Transaction.Amount = amount
@@ -106,7 +106,7 @@ func (c *Client) CreateTodayYNABCapitalGainsTransaction(accountID string, amount
 }
 
 // Accepts a YNAB account ID, transaction ID and transaction amount and updates the YNAB transaction with the matching ID
-func (c *Client) UpdateTodayYNABCapitalGainsTransaction(accountID string, transactionID string, amount int) error {
+func (c *Client) updateTodayYNABCapitalGainsTransaction(accountID string, transactionID string, amount int) error {
 	transaction := TransactionRequest{}
 	transaction.Transaction.AccountID = accountID
 	transaction.Transaction.ID = transactionID