better error handling and logging

main.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"fmt"
-	"log"
 
 	"github.com/buger/goterm"
 	"github.com/go-resty/resty/v2"
@@ -10,7 +9,7 @@ import (
 )
 
 func output(client *resty.Client, url string, width, height int, arr [][]Cell) {
-	goterm.MoveCursor(1, 2)
+	goterm.MoveCursor(1, 4)
 	// Prepare instructions for matrix
 	instructions := make([]interface{}, 0)
 	// Append all live cells as pixel instructions
@@ -37,11 +36,8 @@ func output(client *resty.Client, url string, width, height int, arr [][]Cell) {
 func main() {
 	const FPS = 10
 
-	// Load .env file if it exists
-	err := godotenv.Load(".env")
-	if err != nil {
-		log.Fatal("Error loading .env file")
-	}
+	// Try loading .env file if it exists
+	godotenv.Load(".env")
 
 	// Load env server data
 	url, width, height := loadMatrixData()
@@ -50,7 +46,10 @@ func main() {
 	// Initialize resty client
 	client := resty.New()
 	// Initialize pixel color
-	sendRequest(client, url, []interface{}{Color{R: 255, G: 255, B: 255, Endpoint: COLOR}})
+	err := sendRequest(client, url, []interface{}{Color{R: 255, G: 255, B: 255, Endpoint: COLOR}})
+	if err != nil {
+		goterm.Println(err)
+	}
 
 	// Run Game of Life
 	done := setup(func(c [][]Cell) {

request.go

@@ -5,13 +5,12 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"log"
 	"mime/multipart"
 
 	"github.com/go-resty/resty/v2"
 )
 
-func createInsructions(marshal []byte) (*bytes.Buffer, string) {
+func createInsructions(marshal []byte) (*bytes.Buffer, string, error) {
 	// Create a new form data object
 	body := &bytes.Buffer{}
 	writer := multipart.NewWriter(body)
@@ -19,29 +18,27 @@ func createInsructions(marshal []byte) (*bytes.Buffer, string) {
 	// Add the "instructions" key with the value of marshal
 	part, err := writer.CreateFormField("instructions")
 	if err != nil {
-		log.Fatal(err)
-		return nil, ""
+		return nil, "", err
 	}
 	part.Write(marshal)
 
 	// Close the multipart writer
 	writer.Close()
 
-	return body, writer.FormDataContentType()
+	return body, writer.FormDataContentType(), nil
 }
 
-func sendRequest(client *resty.Client, url string, ins []interface{}) {
+func sendRequest(client *resty.Client, url string, ins []interface{}) error {
 	// Manually marshal instructions
 	marshal, err := json.Marshal(ins)
 	if err != nil {
-		log.Fatal(err)
-		return
+		return err
 	}
 
 	// Create instructions form data
-	req, content := createInsructions(marshal)
-	if req == nil {
-		return
+	req, content, err := createInsructions(marshal)
+	if err != nil {
+		return err
 	}
 
 	// Build and send request
@@ -52,20 +49,20 @@ func sendRequest(client *resty.Client, url string, ins []interface{}) {
 
 	// Error handling
 	if err != nil {
-		log.Fatal(err)
-		return
+		return err
 	}
 
 	// Unmarshal response
 	var data Response
 	err = json.Unmarshal(res.Body(), &data)
 	if err != nil {
-		log.Fatal(err)
-		return
+		return err
 	}
 
 	// Print response
 	if !data.Success {
-		log.Fatal(errors.New("Remote server responded unsuccessfully!"))
+		return errors.New("Remote server responded unsuccessfully!")
 	}
+
+	return nil
 }