Init

config/config.go

@@ -0,0 +1,124 @@
+package config
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/kelseyhightower/envconfig"
+)
+
+const (
+	DEFAULT_DIR              = "cache"
+	DEFAULT_GIT_CACHE_DIR    = "git"
+	DEFAULT_GND_CACHE_DIR    = "gnd"
+	DEFAULT_GEO_CACHE_DIR    = "geo"
+	DEFAULT_SEARCH_CACHE_DIR = "search"
+	DEFAULT_IMG_DIR          = "data_bilder"
+
+	DEFAULT_PORT  = "8080"
+	DEFAULT_ADDR  = "localhost"
+	DEFAULT_HTTPS = false
+
+	ENV_PREFIX = "KGPZ"
+)
+
+type ConfigProvider struct {
+	Files []string
+	*Config
+}
+
+type Config struct {
+	// At least one of these should be set
+	BaseDIR         string `json:"base_dir" envconfig:"BASE_DIR"`
+	GitURL          string `json:"git_url" envconfig:"GIT_URL"`
+	GitBranch       string `json:"git_branch" envconfig:"GIT_BRANCH"`
+	GITPath         string `json:"git_path" envconfig:"GIT_PATH"`
+	GNDPath         string `json:"gnd_path" envconfig:"GND_PATH"`
+	GeoPath         string `json:"geo_path" envconfig:"GEO_PATH"`
+	WebHookEndpoint string `json:"webhook_endpoint" envconfig:"WEBHOOK_ENDPOINT"`
+	WebHookSecret   string `json:"webhook_secret" envconfig:"WEBHOOK_SECRET"`
+	Debug           bool   `json:"debug" envconfig:"DEBUG"`
+	Watch           bool   `json:"watch" envconfig:"WATCH"`
+	LogData         bool   `json:"log_data" envconfig:"LOG_DATA"`
+
+	Address string `json:"address" envconfig:"ADDRESS"`
+	Port    string `json:"port" envconfig:"PORT"`
+	Https   bool   `json:"https" envconfig:"HTTPS"`
+}
+
+func NewConfigProvider(files []string) *ConfigProvider {
+	return &ConfigProvider{Files: files}
+}
+
+func (c *ConfigProvider) Read() error {
+	c.Config = &Config{}
+	for _, file := range c.Files {
+		c.Config = readSettingsFile(c.Config, file)
+	}
+	c.Config = readSettingsEnv(c.Config)
+	c.Config = readDefaults(c.Config)
+	return nil
+}
+
+func (c *ConfigProvider) Validate() error {
+	if strings.TrimSpace(c.Config.BaseDIR) == "" {
+		return fmt.Errorf("Base directory path not set")
+	}
+	return nil
+}
+
+func readSettingsFile(cfg *Config, path string) *Config {
+	f, err := os.Open(path)
+	if err != nil {
+		return cfg
+	}
+	defer f.Close()
+
+	dec := json.NewDecoder(f)
+	err = dec.Decode(cfg)
+
+	return cfg
+}
+
+func readSettingsEnv(cfg *Config) *Config {
+	_ = envconfig.Process(ENV_PREFIX, cfg)
+	return cfg
+}
+
+func readDefaults(cfg *Config) *Config {
+	if strings.TrimSpace(cfg.BaseDIR) == "" {
+		cfg.BaseDIR = DEFAULT_DIR
+	}
+
+	if strings.TrimSpace(cfg.GITPath) == "" {
+		cfg.GITPath = DEFAULT_GIT_CACHE_DIR
+	}
+
+	if strings.TrimSpace(cfg.GNDPath) == "" {
+		cfg.GNDPath = DEFAULT_GND_CACHE_DIR
+	}
+
+	if strings.TrimSpace(cfg.GeoPath) == "" {
+		cfg.GeoPath = DEFAULT_GEO_CACHE_DIR
+	}
+
+	if strings.TrimSpace(cfg.Address) == "" {
+		cfg.Address = DEFAULT_ADDR
+	}
+
+	if strings.TrimSpace(cfg.Port) == "" {
+		cfg.Port = DEFAULT_PORT
+	}
+
+	return cfg
+}
+
+func (c *Config) String() string {
+	json, err := json.Marshal(c)
+	if err != nil {
+		return "Config: Error marshalling to JSON"
+	}
+	return string(json)
+}