// Copyright 2016-2017, Pulumi Corporation.  All rights reserved.

syntax = "proto3";

import "google/protobuf/empty.proto";
import "google/protobuf/struct.proto";

package pulumirpc;

// ResourceProvider is a service that understands how to create, read, update, or delete resources for types defined
// within a single package.  It is driven by the overall planning engine in response to resource diffs.
service ResourceProvider {
    // Configure configures the resource provider with "globals" that control its behavior.
    rpc Configure(ConfigureRequest) returns (google.protobuf.Empty){}
    // Invoke dynamically executes a built-in function in the provider.
    rpc Invoke(InvokeRequest) returns (InvokeResponse) {}
    // Check validates that the given property bag is valid for a resource of the given type.
    rpc Check(CheckRequest) returns (CheckResponse) {}
    // Diff checks what impacts a hypothetical update will have on the resource's properties.
    rpc Diff(DiffRequest) returns (DiffResponse) {}
    // Create allocates a new instance of the provided resource and returns its unique ID afterwards.  (The input ID
    // must be blank.)  If this call fails, the resource must not have been created (i.e., it is "transacational").
    rpc Create(CreateRequest) returns (CreateResponse) {}
    // Update updates an existing resource with new values.
    rpc Update(UpdateRequest) returns (UpdateResponse) {}
    // Delete tears down an existing resource with the given ID.  If it fails, the resource is assumed to still exist.
    rpc Delete(DeleteRequest) returns (google.protobuf.Empty) {}
}

message ConfigureRequest {
    map<string, string> variables = 1; // a map of configuration keys to values.
}

message InvokeRequest {
    string tok = 1;                  // the function token to invoke.
    google.protobuf.Struct args = 2; // the arguments for the function invocation.
}

message InvokeResponse {
    google.protobuf.Struct return = 1;  // the returned values, if invoke was successful.
    repeated CheckFailure failures = 2; // the failures if any arguments didn't pass verification.
}

message CheckRequest {
    string urn = 1;                        // the Pulumi URN for this resource.
    google.protobuf.Struct properties = 2; // the full properties to use for validation.
}

message CheckResponse {
    google.protobuf.Struct defaults = 1; // defaults to use, if any.
    repeated CheckFailure failures = 2;  // any validation failures that occurred.
}

message CheckFailure {
    string property = 1; // the property that failed validation.
    string reason = 2;   // the reason that the property failed validation.
}

message DiffRequest {
    string id = 1;                   // the ID of the resource to diff.
    string urn = 2;                  // the Pulumi URN for this resource.
    google.protobuf.Struct olds = 3; // the old values of properties to diff.
    google.protobuf.Struct news = 4; // the new values of properties to diff.
}

message DiffResponse {
    repeated string replaces = 1; // if this update requires a replacement, the set of properties triggering it.
    repeated string stables = 2;  // an optional list of properties that will not ever change.
}

message CreateRequest {
    string urn = 1;                        // the Pulumi URN for this resource.
    google.protobuf.Struct properties = 2; // the properties to set during creation.
}

message CreateResponse {
    string id = 1;                         // the ID of the created resource.
    google.protobuf.Struct properties = 2; // any properties that were computed during creation.
}

message UpdateRequest {
    string id = 1;                   // the ID of the resource to update.
    string urn = 2;                  // the Pulumi URN for this resource.
    google.protobuf.Struct olds = 3; // the old values of properties to update.
    google.protobuf.Struct news = 4; // the new values of properties to update.
}

message UpdateResponse {
    google.protobuf.Struct properties = 1; // any properties that were computed during updating.
}

message DeleteRequest {
    string id = 1;                         // the ID of the resource to delete.
    string urn = 2;                        // the Pulumi URN for this resource.
    google.protobuf.Struct properties = 3; // the current properties on the resource.
}