Allow config files to inherit from other config files

config/prod.yml

@@ -1,3 +1,7 @@
+# Inherit config from this other config file
+# so I only need to overwrite some values
+inherit: dev
+
 app_name: "Super Graph Production"
 host_port: 0.0.0.0:8080
 web_ui: false
@@ -76,104 +80,9 @@ database:
   type: postgres
   host: db
   port: 5432
-  dbname: {{app_name_slug}}_development
+  dbname: app_production
   user: postgres
   password: ''
   #pool_size: 10
   #max_retries: 0
-  #log_level: "debug" 
-
-  # Define variables here that you want to use in filters 
-  # sub-queries must be wrapped in ()
-  variables:
-    account_id: "(select account_id from users where id = $user_id)"
-
-  # Define defaults to for the field key and values below
-  defaults:
-    filters: ["{ user_id: { eq: $user_id } }"]
-    
-    # Field and table names that you wish to block
-    blocklist:
-      - ar_internal_metadata
-      - schema_migrations
-      - secret
-      - password
-      - encrypted
-      - token
-
-tables:
-  - name: customers
-    # remotes:
-    #   - name: payments
-    #     id: stripe_id
-    #     url: http://rails_app:3000/stripe/$id
-    #     path: data
-    #     # pass_headers: 
-    #     #   - cookie
-    #     #   - host
-    #     set_headers:
-    #       - name: Authorization
-    #         value: Bearer <stripe_api_key>
-
-  - # You can create new fields that have a
-    # real db table backing them
-    name: me
-    table: users
-
-roles_query: "SELECT * FROM users as usr WHERE id = $user_id"
-
-roles:
-  - name: anon
-    tables:
-      - name: products
-        limit: 10
-
-        query:
-          columns: ["id", "name", "description" ]
-          aggregation: false
-
-        insert:
-          block: false
-            
-        update:
-          block: false
-
-        delete:
-          block: false
-
-  - name: user
-    tables:
-      - name: users
-        query:
-          filters: ["{ id: { _eq: $user_id } }"]
-
-      - name: products
-        query:
-          limit: 50
-          filters: ["{ user_id: { eq: $user_id } }"]
-          columns: ["id", "name", "description" ]
-          disable_functions: false
-
-        insert:
-          filters: ["{ user_id: { eq: $user_id } }"]
-          columns: ["id", "name", "description" ]
-          set:
-            - created_at: "now"
-            
-        update:
-          filters: ["{ user_id: { eq: $user_id } }"]
-          columns:
-            - id
-            - name
-          set:
-            - updated_at: "now"
-
-        delete:
-          block: true
-
-  - name: admin
-    match: id = 1
-    tables:
-      - name: users
-        # query:
-        #   filters: ["{ account_id: { _eq: $account_id } }"]
+  #log_level: "debug" 

docs/guide.md

@@ -1040,6 +1040,10 @@ Configuration files can either be in YAML or JSON their names are derived from t
 We're tried to ensure that the config file is self documenting and easy to work with.
 
 ```yaml
+# Inherit config from this other config file
+# so I only need to overwrite some values
+inherit: base
+
 app_name: "Super Graph Development"
 host_port: 0.0.0.0:8080
 web_ui: true

serv/cmd.go

@@ -150,13 +150,25 @@ func initLog() *zerolog.Logger {
 }
 
 func initConf() (*config, error) {
-	vi := newConfig()
+	vi := newConfig(getConfigName())
 
 	if err := vi.ReadInConfig(); err != nil {
 		return nil, err
 	}
 
-	c := &config{}
+	inherit := vi.GetString("inherit")
+	if len(inherit) != 0 {
+		vi = newConfig(inherit)
+
+		if err := vi.ReadInConfig(); err != nil {
+			return nil, err
+		}
+
+		vi.SetConfigName(getConfigName())
+		vi.MergeInConfig()
+	}
+
+	c := &config{Viper: vi}
 
 	if err := vi.Unmarshal(c); err != nil {
 		return nil, fmt.Errorf("unable to decode config, %v", err)

serv/cmd_conf.go

@@ -15,13 +15,12 @@ func cmdConfDump(cmd *cobra.Command, args []string) {
 
 	fname := fmt.Sprintf("%s.%s", getConfigName(), args[0])
 
-	vi := newConfig()
-
-	if err := vi.ReadInConfig(); err != nil {
-		logger.Fatal().Err(err).Send()
+	conf, err := initConf()
+	if err != nil {
+		logger.Fatal().Err(err).Msg("failed to read config")
 	}
 
-	if err := vi.WriteConfigAs(fname); err != nil {
+	if err := conf.Viper.WriteConfigAs(fname); err != nil {
 		logger.Fatal().Err(err).Send()
 	}
 

serv/config.go

@@ -9,6 +9,8 @@ import (
 )
 
 type config struct {
+	*viper.Viper
+
 	AppName        string `mapstructure:"app_name"`
 	Env            string
 	HostPort       string `mapstructure:"host_port"`
@@ -134,16 +136,16 @@ type configRole struct {
 	}
 }
 
-func newConfig() *viper.Viper {
+func newConfig(name string) *viper.Viper {
 	vi := viper.New()
 
 	vi.SetEnvPrefix("SG")
 	vi.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
 	vi.AutomaticEnv()
 
+	vi.SetConfigName(name)
 	vi.AddConfigPath(confPath)
 	vi.AddConfigPath("./config")
-	vi.SetConfigName(getConfigName())
 
 	vi.SetDefault("host_port", "0.0.0.0:8080")
 	vi.SetDefault("web_ui", false)

serv/serv.go

@@ -148,7 +148,15 @@ func startHTTP() {
 		db.Close()
 	})
 
-	fmt.Printf("%s listening on %s (%s)\n", serverName, hostPort, conf.Env)
+	var ident string
+
+	if len(conf.AppName) == 0 {
+		ident = conf.Env
+	} else {
+		ident = conf.AppName
+	}
+
+	fmt.Printf("%s listening on %s (%s)\n", serverName, hostPort, ident)
 
 	if err := srv.ListenAndServe(); err != http.ErrServerClosed {
 		logger.Error().Err(err).Msg("server closed")

tmpl/prod.yml

@@ -1,3 +1,7 @@
+# Inherit config from this other config file
+# so I only need to overwrite some values
+inherit: dev
+
 app_name: "Super Graph Production"
 host_port: 0.0.0.0:8080
 web_ui: false
@@ -81,99 +85,4 @@ database:
   password: ''
   #pool_size: 10
   #max_retries: 0
-  #log_level: "debug" 
-
-  # Define variables here that you want to use in filters 
-  # sub-queries must be wrapped in ()
-  variables:
-    account_id: "(select account_id from users where id = $user_id)"
-
-  # Define defaults to for the field key and values below
-  defaults:
-    filters: ["{ user_id: { eq: $user_id } }"]
-    
-    # Field and table names that you wish to block
-    blocklist:
-      - ar_internal_metadata
-      - schema_migrations
-      - secret
-      - password
-      - encrypted
-      - token
-
-tables:
-  - name: customers
-    # remotes:
-    #   - name: payments
-    #     id: stripe_id
-    #     url: http://rails_app:3000/stripe/$id
-    #     path: data
-    #     # pass_headers: 
-    #     #   - cookie
-    #     #   - host
-    #     set_headers:
-    #       - name: Authorization
-    #         value: Bearer <stripe_api_key>
-
-  - # You can create new fields that have a
-    # real db table backing them
-    name: me
-    table: users
-
-roles_query: "SELECT * FROM users as usr WHERE id = $user_id"
-
-roles:
-  - name: anon
-    tables:
-      - name: products
-        limit: 10
-
-        query:
-          columns: ["id", "name", "description" ]
-          aggregation: false
-
-        insert:
-          block: false
-            
-        update:
-          block: false
-
-        delete:
-          block: false
-
-  - name: user
-    tables:
-      - name: users
-        query:
-          filters: ["{ id: { _eq: $user_id } }"]
-
-      - name: products
-        query:
-          limit: 50
-          filters: ["{ user_id: { eq: $user_id } }"]
-          columns: ["id", "name", "description" ]
-          disable_functions: false
-
-        insert:
-          filters: ["{ user_id: { eq: $user_id } }"]
-          columns: ["id", "name", "description" ]
-          set:
-            - created_at: "now"
-            
-        update:
-          filters: ["{ user_id: { eq: $user_id } }"]
-          columns:
-            - id
-            - name
-          set:
-            - updated_at: "now"
-
-        delete:
-          deny: true
-
-  - name: admin
-    match: id = 1
-    tables:
-      - name: users
-        # query:
-        #   filters: ["{ account_id: { _eq: $account_id } }"]
+  #log_level: "debug"