chore(runner): refactor register flow

Signed-off-by: Bo-Yi.Wu <appleboy.tw@gmail.com>

config/config.go

@@ -0,0 +1,101 @@
+package config
+
+import (
+	"fmt"
+	"net/url"
+	"os"
+	"runtime"
+
+	"github.com/joho/godotenv"
+	"github.com/kelseyhightower/envconfig"
+)
+
+type (
+	// Config provides the system configuration.
+	Config struct {
+		Debug    bool `envconfig:"GITEA_DEBUG"`
+		Trace    bool `envconfig:"GITEA_TRACE"`
+		Client   Client
+		Runner   Runner
+		Platform Platform
+	}
+
+	Client struct {
+		Address    string `ignored:"true"`
+		Proto      string `envconfig:"GITEA_RPC_PROTO"  default:"http"`
+		Host       string `envconfig:"GITEA_RPC_HOST"`
+		Secret     string `envconfig:"GITEA_RPC_SECRET"`
+		SkipVerify bool   `envconfig:"GITEA_RPC_SKIP_VERIFY"`
+		GRPC       bool   `envconfig:"GITEA_RPC_GRPC" default:"true"`
+		GRPCWeb    bool   `envconfig:"GITEA_RPC_GRPC_WEB"`
+	}
+
+	Runner struct {
+		Name     string            `envconfig:"GITEA_RUNNER_NAME"`
+		URL      string            `envconfig:"GITEA_URL" required:"true"`
+		Token    string            `envconfig:"GITEA_TOKEN" required:"true"`
+		Capacity int               `envconfig:"GITEA_RUNNER_CAPACITY" default:"1"`
+		Environ  map[string]string `envconfig:"GITEA_RUNNER_ENVIRON"`
+		EnvFile  string            `envconfig:"GITEA_RUNNER_ENV_FILE"`
+		Labels   []string          `envconfig:"GITEA_RUNNER_LABELS"`
+	}
+
+	Platform struct {
+		OS      string `envconfig:"GITEA_PLATFORM_OS"`
+		Arch    string `envconfig:"GITEA_PLATFORM_ARCH"`
+		Kernel  string `envconfig:"GITEA_PLATFORM_KERNEL"`
+		Variant string `envconfig:"GITEA_PLATFORM_VARIANT"`
+	}
+)
+
+// FromEnviron returns the settings from the environment.
+func FromEnviron() (Config, error) {
+	cfg := Config{}
+	if err := envconfig.Process("", &cfg); err != nil {
+		return cfg, err
+	}
+
+	// check runner remote url
+	u, err := url.Parse(cfg.Runner.URL)
+	if err != nil {
+		return cfg, err
+	}
+
+	cfg.Client.Proto = u.Scheme
+	cfg.Client.Host = u.Host
+	cfg.Client.Secret = cfg.Runner.Token
+
+	// runner config
+	if cfg.Runner.Environ == nil {
+		cfg.Runner.Environ = map[string]string{}
+	}
+	if cfg.Runner.Name == "" {
+		cfg.Runner.Name, _ = os.Hostname()
+	}
+
+	// platform config
+	if cfg.Platform.OS == "" {
+		cfg.Platform.OS = runtime.GOOS
+	}
+	if cfg.Platform.Arch == "" {
+		cfg.Platform.Arch = runtime.GOARCH
+	}
+
+	cfg.Client.Address = fmt.Sprintf(
+		"%s://%s",
+		cfg.Client.Proto,
+		cfg.Client.Host,
+	)
+
+	if file := cfg.Runner.EnvFile; file != "" {
+		envs, err := godotenv.Read(file)
+		if err != nil {
+			return cfg, err
+		}
+		for k, v := range envs {
+			cfg.Runner.Environ[k] = v
+		}
+	}
+
+	return cfg, err
+}