config: Implement per profile based api cache (#39)

This fixes #39 and implements logic to have separate api cache on per
profile basis. On changing server profile, user won't need to run
sync, any previously sync-ed cache will be re-used.

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>

Author: yadvr

cmd/set.go

@@ -57,6 +57,8 @@ func init() {
 				fmt.Println("Username:   ", r.Config.ActiveProfile.Username)
 				fmt.Println("Domain:     ", r.Config.ActiveProfile.Domain)
 				fmt.Println("API Key:    ", r.Config.ActiveProfile.APIKey)
+				fmt.Println("Total APIs: ", len(r.Config.GetCache()))
+
 				fmt.Println()
 			}
 			return nil

config/cache.go

@@ -79,8 +79,10 @@ func (c *Config) GetCache() map[string]*API {
 }
 
 // LoadCache loads cache using the default cache file
-func LoadCache(c *Config) {
-	cache, err := ioutil.ReadFile(c.CacheFile)
+func LoadCache(c *Config) interface{} {
+	cacheFile := c.CacheFile()
+	Debug("Trying to read API cache from:", cacheFile)
+	cache, err := ioutil.ReadFile(cacheFile)
 	if err != nil {
 		if c.HasShell {
 			fmt.Fprintf(os.Stderr, "Loaded in-built API cache. Failed to read API cache, please run 'sync'.\n")
@@ -89,13 +91,13 @@ func LoadCache(c *Config) {
 	}
 	var data map[string]interface{}
 	_ = json.Unmarshal(cache, &data)
-	c.UpdateCache(data)
+	return c.UpdateCache(data)
 }
 
 // SaveCache saves received auto-discovery data to cache file
 func (c *Config) SaveCache(response map[string]interface{}) {
 	output, _ := json.Marshal(response)
-	ioutil.WriteFile(c.CacheFile, output, 0600)
+	ioutil.WriteFile(c.CacheFile(), output, 0600)
 }
 
 // UpdateCache uses auto-discovery data to update internal API cache

config/config.go

@@ -68,28 +68,41 @@ type Config struct {
 	Dir           string
 	ConfigFile    string
 	HistoryFile   string
-	CacheFile     string
 	LogFile       string
 	HasShell      bool
 	Core          *Core
 	ActiveProfile *ServerProfile
 }
 
-func getDefaultConfigDir() string {
-	home, err := homedir.Dir()
-	if err != nil {
-		fmt.Println(err)
-		os.Exit(1)
+// CacheFile returns the path to the cache file for a server profile
+func (c Config) CacheFile() string {
+	cacheDir := path.Join(c.Dir, "profiles")
+	cacheFileName := "cache"
+	if c.Core != nil && len(c.Core.ProfileName) > 0 {
+		cacheFileName = c.Core.ProfileName + ".cache"
 	}
-	cmkHome := path.Join(home, ".cmk")
-	if _, err := os.Stat(cmkHome); os.IsNotExist(err) {
-		err := os.Mkdir(cmkHome, 0700)
+	checkAndCreateDir(cacheDir)
+	return path.Join(cacheDir, cacheFileName)
+}
+
+func checkAndCreateDir(path string) string {
+	if fileInfo, err := os.Stat(path); os.IsNotExist(err) || !fileInfo.IsDir() {
+		err := os.Mkdir(path, 0700)
 		if err != nil {
 			fmt.Println(err)
 			os.Exit(1)
 		}
 	}
-	return cmkHome
+	return path
+}
+
+func getDefaultConfigDir() string {
+	home, err := homedir.Dir()
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	return checkAndCreateDir(path.Join(home, ".cmk"))
 }
 
 func defaultCoreConfig() Core {
@@ -122,7 +135,6 @@ func defaultConfig() *Config {
 	return &Config{
 		Dir:           configDir,
 		ConfigFile:    path.Join(configDir, "config"),
-		CacheFile:     path.Join(configDir, "cache"),
 		HistoryFile:   path.Join(configDir, "history"),
 		LogFile:       path.Join(configDir, "log"),
 		HasShell:      false,
@@ -164,6 +176,7 @@ func reloadConfig(cfg *Config) *Config {
 	}
 	cfg = saveConfig(cfg)
 	fileLock.Unlock()
+	LoadCache(cfg)
 	return cfg
 }