support for defualt configs, index aws instances

main.go

@@ -2,20 +2,57 @@ package main
 
 import (
 	"fmt"
-	"os"
+	"net/netip"
 
+	"github.com/google/uuid"
 	"github.com/thefeli73/polemos/mtdaws"
 	"github.com/thefeli73/polemos/state"
 )
 
+// ConfigPath is a string of the location for the configfile
+var ConfigPath string
+
 func main() {
 	fmt.Println("Starting Polemos")
 
-	config, err := state.LoadConf("config.yaml")
-	if err != nil {
-		fmt.Println("Error loading config:", err)
-		os.Exit(1)
-	}
+	ConfigPath = "config.yaml"
+	
+	config := state.LoadConf(ConfigPath)
+	state.SaveConf(ConfigPath, config)
+
+	config = indexInstances(config)
 
-	mtdaws.IndexInstances(config)
 }
+
+func indexInstances(config state.Config) state.Config {
+	fmt.Println("Indexing instances")
+
+	//index AWS instances
+	awsInstances := mtdaws.GetInstances(config)
+	for _, instance := range awsInstances {
+		cloudID := mtdaws.GetCloudID(instance)
+		ip, err := netip.ParseAddr(instance.PublicIP)
+		if err != nil {
+			fmt.Println("Error converting ip:", err)
+			continue
+		}
+		config = indexInstance(config, cloudID, ip)
+	}
+	return config
+}
+
+func indexInstance(config state.Config, cloudID string, serviceIP netip.Addr) state.Config {
+	for _, service := range config.MTD.Services {
+		if service.CloudID == cloudID {
+			return config
+		}
+	}
+	u := uuid.New()
+	newService := state.Service{
+		ID: state.CustomUUID(u),
+		CloudID: cloudID,
+		ServiceIP: serviceIP}
+	config.MTD.Services = append(config.MTD.Services, newService)
+	state.SaveConf(ConfigPath, config)
+	return config
+}

mtdaws/utils.go

@@ -31,8 +31,13 @@ func NewConfig(region string, credentials string) aws.Config {
 	return cfg
 }
 
-// IndexInstances scans all configured regions for instances and add them to services
-func IndexInstances(config state.Config) []AwsInstance {
+// GetCloudID returns a string to find the instance based on information from aws
+func GetCloudID(instance AwsInstance) string {
+	return "aws_" + instance.Region + "_" + instance.InstanceID
+}
+
+// GetInstances scans all configured regions for instances and add them to services
+func GetInstances(config state.Config) []AwsInstance {
 	awsInstances := []AwsInstance{}
 	for _, region := range config.AWS.Regions {
 		awsConfig := NewConfig(region, config.AWS.CredentialsPath)

state/config.go

@@ -1,8 +1,10 @@
 package state
 
 import (
+	"fmt"
 	"io/ioutil"
 	"net/netip"
+	"os"
 
 	"github.com/google/uuid"
 	"gopkg.in/yaml.v3"
@@ -15,47 +17,77 @@ type Config struct {
 }
 
 type mtdconf struct {
-    Services        []service   `yaml:"services"`
+    Services        []Service   `yaml:"services"`
 }
 
-type service struct {
-    ID              customUUID  `yaml:"id"`
-    ServiceID       string      `yaml:"cloud_id"`
+// Service contains all necessary information about a service to identify it in the cloud as well as configuring a proxy for it
+type Service struct {
+    ID              CustomUUID  `yaml:"id"`
+    CloudID         string      `yaml:"cloud_id"`
     EntryIP         netip.Addr  `yaml:"entry_ip"`
     EntryPort       uint16      `yaml:"entry_port"`
     ServiceIP       netip.Addr  `yaml:"service_ip"`
     ServicePort     uint16      `yaml:"service_port"`
 }
 
-type customUUID uuid.UUID
+// CustomUUID is an alias for uuid.UUID to enable custom unmarshal function
+type CustomUUID uuid.UUID
 
 type aws struct {
     Regions         []string    `yaml:"regions"`
     CredentialsPath string      `yaml:"credentials_path"`
 }
 
-func (u *customUUID) UnmarshalYAML(value *yaml.Node) error {
+// UnmarshalYAML parses uuid in yaml to CustomUUID type
+func (u *CustomUUID) UnmarshalYAML(value *yaml.Node) error {
 	id, err := uuid.Parse(value.Value)
 	if err != nil {
 		return err
 	}
-	*u = customUUID(id)
+	*u = CustomUUID(id)
 	return nil
 }
 
+// MarshalYAML parses CustomUUID type to uuid string for yaml 
+func (u CustomUUID) MarshalYAML() (interface{}, error) {
+	return uuid.UUID(u).String(), nil
+}
+
 // LoadConf loads config from a yaml file
-func LoadConf(filename string) (Config, error) {
+func LoadConf(filename string) (Config) {
     var config Config
 
     data, err := ioutil.ReadFile(filename)
     if err != nil {
-        return config, err
+        fmt.Println("Error reading file:", err)
+
+		fmt.Println("Attempting to load default config")
+        data, err = ioutil.ReadFile("config.default.yaml")
+        if err != nil {
+            fmt.Println("Error reading file:", err)
+            os.Exit(1)
+        }
     }
 
     err = yaml.Unmarshal([]byte(data), &config)
     if err != nil {
-        return config, err
+        fmt.Println("Error importing config:", err)
+        os.Exit(1)
     }
+    fmt.Println("Imported config succesfully!")
+    return config
+}
 
-    return config, nil
+// SaveConf saves config to yaml file
+func SaveConf(filename string, config Config) (error) {
+    yamlBytes, err := yaml.Marshal(&config)
+    if err != nil {
+        return err
+	}
+
+	err = ioutil.WriteFile(filename, yamlBytes, 0644)
+	if err != nil {
+        return err
+	}
+    return nil
 }