fix metal provider flag and env loading, and return error if provider not defined

internal/metal/config.go

@@ -1,6 +1,9 @@
 package metal
 
 import (
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+
 	"go.equinixmetal.net/infra9-metal-bridge/internal/metal/providers/emapi"
 	"go.equinixmetal.net/infra9-metal-bridge/internal/metal/providers/emgql"
 )
@@ -13,3 +16,9 @@ type Config struct {
 	// EMAPI sets the provider to Equinix Metal API.
 	EMAPI emapi.Config
 }
+
+// MustViperFlags registers command flags along with the viper bindings.
+func MustViperFlags(v *viper.Viper, flags *pflag.FlagSet) {
+	emgql.MustViperFlags(v, flags)
+	emapi.MustViperFlags(v, flags)
+}

internal/metal/errors.go

@@ -5,4 +5,7 @@ import "errors"
 var (
 	// ErrUnauthorized is returned when the token provided did not validate to a user.
 	ErrUnauthorized = errors.New("unauthorized key")
+
+	// ErrMetalProviderRequired is returned when no provider has been configured for the metal client.
+	ErrMetalProviderRequired = errors.New("metal provider required")
 )

internal/metal/metal.go

@@ -61,5 +61,9 @@ func New(options ...Option) (Client, error) {
 		client.logger = zap.NewNop()
 	}
 
+	if client.provider == nil {
+		return nil, ErrMetalProviderRequired
+	}
+
 	return client, nil
 }

internal/metal/providers/emapi/config.go

@@ -3,6 +3,10 @@ package emapi
 import (
 	"fmt"
 	"net/url"
+
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+	"go.infratographer.com/x/viperx"
 )
 
 // Config provides configuration for connecting to the Equinix Metal API provider.
@@ -17,6 +21,18 @@ type Config struct {
 	ConsumerToken string
 }
 
+// MustViperFlags registers command flags along with the viper bindings.
+func MustViperFlags(v *viper.Viper, flags *pflag.FlagSet) {
+	flags.String("emapi-base-url", "", "Equinix Metal Rest API Base URL")
+	viperx.MustBindFlag(v, "equinixmetal.emapi.baseurl", flags.Lookup("emapi-base-url"))
+
+	flags.String("emapi-auth-token", "", "Equinix Metal Rest Auth Token")
+	viperx.MustBindFlag(v, "equinixmetal.emapi.authtoken", flags.Lookup("emapi-auth-token"))
+
+	flags.String("emapi-consumer-token", "", "Equinix Metal Rest Consumer Token")
+	viperx.MustBindFlag(v, "equinixmetal.emapi.consumertoken", flags.Lookup("emapi-consumer-token"))
+}
+
 // Populated checks if any field has been populated.
 func (c Config) Populated() bool {
 	return c.AuthToken != "" || c.ConsumerToken != "" || c.BaseURL != ""

internal/metal/providers/emgql/config.go

@@ -1,11 +1,23 @@
 package emgql
 
+import (
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+	"go.infratographer.com/x/viperx"
+)
+
 // Config provides configuration for connecting to the Equinix Metal API provider.
 type Config struct {
 	// BaseURL is the baseurl to use when connecting to the Equinix Metal API Provider.
 	BaseURL string
 }
 
+// MustViperFlags registers command flags along with the viper bindings.
+func MustViperFlags(v *viper.Viper, flags *pflag.FlagSet) {
+	flags.String("emgql-base-url", "", "Equinix Metal GraphQL Base URL")
+	viperx.MustBindFlag(v, "equinixmetal.emgql.baseurl", flags.Lookup("emgql-base-url"))
+}
+
 // Populated checks if any field has been populated.
 func (c Config) Populated() bool {
 	return c.BaseURL != ""