add more convenience functions for getting slices from params and add tests

internal/config/config.go

@@ -3,6 +3,7 @@ package config
 import (
 	"errors"
 	"fmt"
+	"math"
 )
 
 type Config struct {
@@ -85,6 +86,90 @@ func (p Params) GetStringSlice(key string) ([]string, error) {
 	return stringSlice, nil
 }
 
+func (p Params) GetIntSlice(key string) ([]int, error) {
+	value, ok := p[key]
+	if !ok {
+		return nil, ErrParamNotFound
+	}
+
+	interfaceSlice, ok := value.([]any)
+	if !ok {
+		return nil, ErrParamNotSlice
+	}
+
+	intSlice := make([]int, len(interfaceSlice))
+	for i, v := range interfaceSlice {
+
+		intValue, ok := v.(int)
+		if ok {
+			intSlice[i] = intValue
+			continue
+		}
+
+		uintValue, ok := v.(uint)
+		if ok {
+			intSlice[i] = int(uintValue)
+			continue
+		}
+
+		floatValue, ok := v.(float64)
+		if ok {
+			if floatValue != math.Floor(floatValue) {
+				return nil, fmt.Errorf("element at index %d is not an integer", i)
+			}
+			intSlice[i] = int(floatValue)
+			continue
+		}
+		return nil, fmt.Errorf("element at index %d is not a number", i)
+	}
+	return intSlice, nil
+}
+
+func (p Params) GetByteSlice(key string) ([]byte, error) {
+	value, ok := p[key]
+	if !ok {
+		return nil, ErrParamNotFound
+	}
+
+	byteSlice, ok := value.([]any)
+	if !ok {
+		return nil, ErrParamNotSlice
+	}
+
+	result := make([]byte, len(byteSlice))
+	for i, v := range byteSlice {
+		uintValue, ok := v.(uint)
+		if ok {
+			if uintValue > 255 {
+				return nil, fmt.Errorf("element at index %d is out of byte range", i)
+			}
+			result[i] = byte(uintValue)
+			continue
+		}
+		intValue, ok := v.(int)
+		if ok {
+			if intValue < 0 || intValue > 255 {
+				return nil, fmt.Errorf("element at index %d is out of byte range", i)
+			}
+			result[i] = byte(intValue)
+			continue
+		}
+		floatValue, ok := v.(float64)
+		if ok {
+			if floatValue != math.Floor(floatValue) {
+				return nil, fmt.Errorf("element at index %d is not an integer", i)
+			}
+			if floatValue < 0 || floatValue > 255 {
+				return nil, fmt.Errorf("element at index %d is out of byte range", i)
+			}
+			result[i] = byte(floatValue)
+			continue
+		}
+		return nil, fmt.Errorf("element at index %d is not a number", i)
+	}
+	return result, nil
+}
+
 type ModuleConfig struct {
 	Id     string `json:"id"`
 	Type   string `json:"type"`

internal/config/config_test.go

@@ -0,0 +1,213 @@
+package config_test
+
+import (
+	"encoding/json"
+	"slices"
+	"testing"
+
+	"github.com/jwetzell/showbridge-go/internal/config"
+)
+
+func TestGoodStringParamsJSON(t *testing.T) {
+	testCases := []struct {
+		name       string
+		paramsJSON string
+		key        string
+		expected   string
+	}{
+		{
+			name:       "string param",
+			paramsJSON: `{"key": "value"}`,
+			key:        "key",
+			expected:   "value",
+		},
+	}
+
+	for _, testCase := range testCases {
+		t.Run(testCase.name, func(t *testing.T) {
+			params := config.Params{}
+			err := json.Unmarshal([]byte(testCase.paramsJSON), &params)
+			if err != nil {
+				t.Fatalf("Failed to unmarshal params JSON: %v", err)
+			}
+			value, err := params.GetString(testCase.key)
+			if err != nil {
+				t.Fatalf("GetString returned error: %v", err)
+			}
+			if value != testCase.expected {
+				t.Fatalf("GetString	 got %s, expected %s", value, testCase.expected)
+			}
+		})
+	}
+}
+
+func TestGoodIntParamsJSON(t *testing.T) {
+	testCases := []struct {
+		name       string
+		paramsJSON string
+		key        string
+		expected   int
+	}{
+		{
+			name:       "int param",
+			paramsJSON: `{"key": 1}`,
+			key:        "key",
+			expected:   1,
+		},
+	}
+
+	for _, testCase := range testCases {
+		t.Run(testCase.name, func(t *testing.T) {
+			params := config.Params{}
+			err := json.Unmarshal([]byte(testCase.paramsJSON), &params)
+			if err != nil {
+				t.Fatalf("Failed to unmarshal params JSON: %v", err)
+			}
+			value, err := params.GetInt(testCase.key)
+			if err != nil {
+				t.Fatalf("GetInt returned error: %v", err)
+			}
+			if value != testCase.expected {
+				t.Fatalf("GetInt got %d, expected %d", value, testCase.expected)
+			}
+		})
+	}
+}
+
+func TestGoodBoolParamsJSON(t *testing.T) {
+	testCases := []struct {
+		name       string
+		paramsJSON string
+		key        string
+		expected   bool
+	}{
+		{
+			name:       "bool param",
+			paramsJSON: `{"key": true}`,
+			key:        "key",
+			expected:   true,
+		},
+	}
+
+	for _, testCase := range testCases {
+		t.Run(testCase.name, func(t *testing.T) {
+			params := config.Params{}
+			err := json.Unmarshal([]byte(testCase.paramsJSON), &params)
+			if err != nil {
+				t.Fatalf("Failed to unmarshal params JSON: %v", err)
+			}
+			value, err := params.GetBool(testCase.key)
+			if err != nil {
+				t.Fatalf("GetBool returned error: %v", err)
+			}
+			if value != testCase.expected {
+				t.Fatalf("GetBool got %t, expected %t", value, testCase.expected)
+			}
+		})
+	}
+}
+
+func TestGoodStringSliceParamsJSON(t *testing.T) {
+	testCases := []struct {
+		name       string
+		paramsJSON string
+		key        string
+		expected   []string
+	}{
+		{
+			name:       "string array",
+			paramsJSON: `{"key": ["value1", "value2"]}`,
+			key:        "key",
+			expected:   []string{"value1", "value2"},
+		},
+	}
+
+	for _, testCase := range testCases {
+		t.Run(testCase.name, func(t *testing.T) {
+			params := config.Params{}
+			err := json.Unmarshal([]byte(testCase.paramsJSON), &params)
+			if err != nil {
+				t.Fatalf("Failed to unmarshal params JSON: %v", err)
+			}
+			value, err := params.GetStringSlice(testCase.key)
+			if err != nil {
+				t.Fatalf("GetStringSlice returned error: %v", err)
+			}
+			if !slices.Equal(value, testCase.expected) {
+				t.Fatalf("GetStringSlice got %v, expected %v", value, testCase.expected)
+			}
+		})
+	}
+}
+
+func TestGoodIntSliceParamsJSON(t *testing.T) {
+	testCases := []struct {
+		name       string
+		paramsJSON string
+		key        string
+		expected   []int
+	}{
+		{
+			name:       "int array",
+			paramsJSON: `{"key": [1, 2, 3]}`,
+			key:        "key",
+			expected:   []int{1, 2, 3},
+		},
+	}
+
+	for _, testCase := range testCases {
+		t.Run(testCase.name, func(t *testing.T) {
+			params := config.Params{}
+			err := json.Unmarshal([]byte(testCase.paramsJSON), &params)
+			if err != nil {
+				t.Fatalf("Failed to unmarshal params JSON: %v", err)
+			}
+			value, err := params.GetIntSlice(testCase.key)
+			if err != nil {
+				t.Fatalf("GetIntSlice returned error: %v", err)
+			}
+			if !slices.Equal(value, testCase.expected) {
+				t.Fatalf("GetIntSlice got %v, expected %v", value, testCase.expected)
+			}
+		})
+	}
+}
+
+func TestGoodByteSliceParamsJSON(t *testing.T) {
+	testCases := []struct {
+		name       string
+		paramsJSON string
+		key        string
+		expected   []byte
+	}{
+		{
+			name:       "byte array",
+			paramsJSON: `{"key": [1,2,3,4]}`,
+			key:        "key",
+			expected:   []byte{1, 2, 3, 4},
+		},
+		{
+			name:       "byte array with floats",
+			paramsJSON: `{"key": [1.0,2.0,3.0,4.0]}`,
+			key:        "key",
+			expected:   []byte{1, 2, 3, 4},
+		},
+	}
+
+	for _, testCase := range testCases {
+		t.Run(testCase.name, func(t *testing.T) {
+			params := config.Params{}
+			err := json.Unmarshal([]byte(testCase.paramsJSON), &params)
+			if err != nil {
+				t.Fatalf("Failed to unmarshal params JSON: %v", err)
+			}
+			value, err := params.GetByteSlice(testCase.key)
+			if err != nil {
+				t.Fatalf("GetByteSlice returned error: %v", err)
+			}
+			if !slices.Equal(value, testCase.expected) {
+				t.Fatalf("GetByteSlice got %v, expected %v", value, testCase.expected)
+			}
+		})
+	}
+}