first commit

provider/env/provider.go

@@ -0,0 +1,61 @@
+package env
+
+import (
+	"context"
+	"os"
+	"strings"
+
+	"gitoa.ru/go-4devs/config"
+	"gitoa.ru/go-4devs/config/key"
+	"gitoa.ru/go-4devs/config/value"
+)
+
+var _ config.Provider = (*Provider)(nil)
+
+type Option func(*Provider)
+
+func WithKeyFactory(factory config.KeyFactory) Option {
+	return func(p *Provider) { p.key = factory }
+}
+
+func New(opts ...Option) *Provider {
+	p := Provider{
+		key: func(ctx context.Context, k config.Key) string {
+			return strings.ToUpper(key.NsAppName("_")(ctx, k))
+		},
+	}
+
+	for _, opt := range opts {
+		opt(&p)
+	}
+
+	return &p
+}
+
+type Provider struct {
+	key config.KeyFactory
+}
+
+func (p *Provider) Name() string {
+	return "env"
+}
+
+func (p *Provider) IsSupport(ctx context.Context, key config.Key) bool {
+	return p.key(ctx, key) != ""
+}
+
+func (p *Provider) Read(ctx context.Context, key config.Key) (config.Variable, error) {
+	k := p.key(ctx, key)
+	if val, ok := os.LookupEnv(k); ok {
+		return config.Variable{
+			Name:     k,
+			Provider: p.Name(),
+			Value:    value.JString(val),
+		}, nil
+	}
+
+	return config.Variable{
+		Name:     k,
+		Provider: p.Name(),
+	}, config.ErrVariableNotFound
+}

provider/env/provider_test.go

@@ -0,0 +1,24 @@
+package env_test
+
+import (
+	"os"
+	"testing"
+
+	"gitoa.ru/go-4devs/config/provider/env"
+	"gitoa.ru/go-4devs/config/test"
+)
+
+func TestProvider(t *testing.T) {
+	t.Parallel()
+
+	os.Setenv("FDEVS_CONFIG_DSN", test.DSN)
+	os.Setenv("FDEVS_CONFIG_PORT", "8080")
+
+	provider := env.New()
+
+	read := []test.Read{
+		test.NewRead("dsn", test.DSN),
+		test.NewRead("port", 8080),
+	}
+	test.Run(t, provider, read)
+}