config services: services.cfg and validation

appengine/config_service/proto/service_config.proto

 // Copyright 2015 The Swarming Authors. All rights reserved.
 // Use of this source code is governed by the Apache v2.0 license that can be
 // found in the LICENSE file.
 
 // Schemas for config files in services/luci-config config set.
 //
 // In this file, "string pattern" is an exact string (can't have a colon) or a
 // string that starts with "regex:", followed by a regular expression. In case
 // of regex, the pattern must match an entire string, as if it was sorrounded by
 // ^ and $.
@@ skipping 29 matching lines @@
   // Where to import "projects/<id>" config set from.
   optional ConfigSetLocation config_location = 2;
 }
 
 // Schema of projects.cfg file. Represents luci tenants registry.
 message ProjectsCfg {
   // All projects served by this instance of Luci.
   repeated Project projects = 1;
 }
 
+/******************************************************************************/
+/* Services                                                                   */
+/******************************************************************************/
+
+// Describes one luci service.
+message Service {
+  // Globally unique id of the service. Required.
+  // Used in "services/<service_id>" config set name.
+  optional string id = 1;
+  // Email addresses of responsible and point-of-contacts for the service.
+  repeated string owners = 2;
+  // Where to import "services/<id>" config set from. If config_location.url is
+  // relative, it is relative to the current configuration file.
+  // If not specified, defaults to "../<id>/".
+  optional ConfigSetLocation config_location = 3;
+  // An HTTPS endpoint that returns JSON-encoded ServiceDynamicMetadata in body.
+  optional string metadata_url = 4;
+}
+
+// Machine-generated service metadata.
+message ServiceDynamicMetadata {
+  // What configs this service can validate and how to validate them.
+  optional Validator validation = 1;
+}
+
+// Schema of services.cfg
+message ServicesCfg {
+  // A list of all luci services. Should be sorted by id.
+  repeated Service services = 1;
+}
+
+/******************************************************************************/
+/* Misc                                                                       */
+/******************************************************************************/
+
+
 // Schema of acl.cfg file.
 message AclCfg {
   // Name of the group that has access to all services/* config sets.
   optional string service_access_group = 1;
   // Name of the group that has access to all projects/* config sets.
   optional string project_access_group = 2;
 }
 
 // Schema for import.cfg. It specified how to import configuration files from
 // external sources.
@@ skipping 29 matching lines @@
   }
   // List of known schemas. They are available at /schemas/<name> as a short
   // mutable link.
   repeated Schema schemas = 1;
 }
 
 /******************************************************************************/
 /* Validation                                                                 */
 /******************************************************************************/
 
-// Schema of validation.cfg
-message ValidationCfg {
-  // Defines one validation rule. It can match configs in different config-sets
-  // and paths.
-  message Rule {
-    // A string pattern (see above) for config_set.
-    optional string config_set = 1;
-    // A string pattern (see above) for config file path.
-    optional string path = 2;
-    // URL of a validation endpoint. The config service will send an HTTP POST
-    // request to the endpoint, where body is JSON-encoded
-    // ValidationRequestMessage. The endpoint is expected to respond with
-    // HTTP status 200 and JSON-encoded ValidationResponseMessage.
-    optional string url = 3;
-  }
-
-  // Defines validation rules for externally-validated configs.
-  // All rules that match a config by config_set and path must pass in order
-  // for a config to be considered valid.
-  repeated Rule rules = 1;
+// Defines a pattern of a config identity. Both config_set and path must
+// match.
+message ConfigPattern {
+  // A string pattern for config_set.
+  optional string config_set = 1;
+  // A string pattern for config file path.
+  optional string path = 2;
 }
 
+// Describes what configuration can be validated and how to validate them.
+message Validator {
+  // A list of configuration patterns that this validator can validate.
+  repeated ConfigPattern patterns = 1;
+  // URL of a validation endpoint. The config service will send an HTTP POST
+  // request to the endpoint, where body is JSON-encoded
+  // ValidationRequestMessage. The endpoint is expected to respond with
+  // HTTP status 200 and JSON-encoded ValidationResponseMessage.
+  optional string url = 2;
+}
 
 // This message is used only in JSON form. It is sent as request body to an
 // external validation endpoint in order to validate a config.
 message ValidationRequestMessage {
   // Config set of the config file to validate.
   optional string config_set = 1;
   // Path of the config file to validate.
   optional string path = 2;
   // Base64-encoded contents of the file.
   optional string content = 3;
@@ skipping 14 matching lines @@
   message Message {
     // Textual representation of the message.
     optional string text = 1;
     // If an error, a config is considered invalid. Defaults to INFO.
     optional Severity severity = 2;
   }
   // Errors, warnings and other information found during validation.
   // If at least one error is found, the config is considered invalid.
   repeated Message messages = 1;
 }