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// ------------------------------------------------------------------
// Connectivity Suite Registry
// ------------------------------------------------------------------
//
// Naming convention according:
// https://cloud.google.com/apis/design/naming_convention
//
// ------------------------------------------------------------------

syntax = "proto3";

package siemens.connectivitysuite.registry.v1;


//===================================================================
// Discovery (Registry) Interface Definitions
//===================================================================


// ===========================================
// The Services Definition
//
service RegistryApi
{
    // Possible return values
    // - OK
    rpc RegisterService( RegisterServiceRequest ) returns( RegisterServiceResponse ) {}

    // Possible return values
    // - OK
    // - NOT_FOUND - service with the provided key was not registered
    rpc UnregisterService( UnregisterServiceRequest ) returns( UnregisterServiceResponse ) {}

    // Possible return values
    // - OK
    rpc QueryRegisteredServices( QueryRegisteredServicesRequest ) returns( QueryRegisteredServicesResponse ) {}
}


// The key of ServiceInfo is the app_instance_id:
message ServiceInfo {
    // Mandatory: unique ID of the application
    // Examples: "s7p1", "pnioc1"
    string app_instance_id = 7;

    // Mandatory: Either 'dns_domainname' or 'ipv4_address' needs to be provided.
    // Intentionally there is no 'ipv6_address', because ipv6 without DNS will not really work.
    oneof grpc_ip {
         // DNS host name of the driver
        string dns_domainname = 1;
        // ipv4 address of the driver
        string ipv4_address = 2;
    }

    // Mandatory: port number of gRPC interface
    uint32 grpc_ip_port_number = 3;

    // Mandatory: application type
    // +----------------------------------------------------
    // | Examples
    // +-----------------------+----------------------------
    // | "cs-driver"           | Connectivity Suite Driver
    // | "cs-gateway"          | Connectivity Suite Gateway which is configured
    // |                       | by the IIH Configurator
    // | "noncs-driver"        | Driver which supports all interfaces to be configurable
    // |                       | via IIH Configurator, but doesn't support DataApi
    // | "cs-import-converter" | Service which can convert a device-specific configuration
    // |                       | file to a 'Connectivity Suite compatible' configuration file.
    // |                       | This app is e.g. used by the IIH Configurator to let convert
    // |                       | specific config files provided by the user to compatible format
    // | "cs-tagbrowser"       | Service which can browse tags. See the 'BrowsingApi'
    // | "iah-discover"        | The Connector is acting as a Asset Link (AL) and returns IAH
    // |                       | compliant discover results.
    // |                       | The interface siemens.industrialassethub.discover.v1 must be supported.
    //
    // For more info see the Connectivity Suite documentation.
    repeated string app_types = 4;

    // List of all interfaces the app supports.
    // An interface is identified by the package name of the proto file / API service
    // Examples "siemens.connectivitysuite.browsing.v2" or "siemens.connectivitysuite.data.v1"
    // When this list is empty, the service is considered to support all mandatory interfaces
    // of the listed app_types and none of the optional ones. Those are then automatically
    // added by the Registry Service.
    repeated string interfaces = 8;

    // Mandatory: the schema identification(s) of the driver
    repeated string driver_schema_uris = 5;
}

// RegisterService
message RegisterServiceRequest {
    ServiceInfo info = 1;
}
message RegisterServiceResponse {
    // maximum time between ServiceInfo refresh in [sec]
    uint32 expire_time = 2;
}

// UnregisterService
// Only the following fields of 'info' are considered, the rest is ignored:
//   app_instance_id
message UnregisterServiceRequest {
    ServiceInfo info = 1;
}

message UnregisterServiceResponse {
}


// QueryRegisteredServices
// Any property which is not set, is ignored
// When a property has multiple values, any entry which matches at least one of the fields matches
// When multiple properties are set, all have to match
//
// Example1: return all apps which have either app_type "cs-driver" or "cs-gateway":
//   .app_types = ["cs-driver", "cs-gateway"]
//
// Example2: return all apps which have app_type "cs-import-converter"
//  and uri="https://siemens.com/connectivity_suite/schemas/s7plus/1.0.0/config.json":
//   .app_types = ["cs-import-converter"]
//   .driver_schema_uris = ["https://siemens.com/connectivity_suite/schemas/s7plus/1.0.0/config.json"]
//
message ServiceInfoFilter {
    // unique ID(s) of the application
    // Examples: "s7p1", "pnioc1"
    repeated string app_instance_ids = 2;

    // application types
    // Examples "cs-driver" or "cs-gateway"
    // (see 'ServiceInfo.app_types')
    repeated string app_types = 3;

    // the schema identification(s) of the driver
    repeated string driver_schema_uris = 4;

    // interfaces (actually the package names of the interfaces)
    // Examples "siemens.connectivitysuite.browsing.v2" or "siemens.connectivitysuite.data.v1"
    // (see 'ServiceInfo.interfaces')
    repeated string interfaces = 5;
}

message QueryRegisteredServicesRequest {
    ServiceInfoFilter filter = 1;
}

message QueryRegisteredServicesResponse {
    repeated ServiceInfo infos = 1;
}