terraform/plugin/proto/plugin.proto

syntax = "proto3";

package proto;

// DynamicValue is an opaque encoding of terraform data, with the field name
// indicating the encoding scheme used.
message DynamicValue {
    bytes msgpack = 1;
    bytes json = 2;
}

message Diagnostic {
    enum Severity {
        INVALID = 0;
        ERROR = 1;
        WARNING = 2;
    }
    Severity severity = 1;
    string summary = 2;
    string detail = 3;
    AttributePath attribute = 4;
}

message AttributePath {
    message Step {
        oneof selector {
            // Set "attribute_name" to represent looking up an attribute
            // in the current object value.
            string attribute_name = 1;
            // Set "element_key_*" to represent looking up an element in
            // an indexable collection type.
            string element_key_string = 2;
            int64 element_key_int = 3;
        }
    }
    repeated Step steps = 1;
}

message Stop {
    message Request {
    }
    message Response {
		string Error = 1;
    }
}

// RawState holds the stored state for a resource to be upgraded by the
// provider. It can be in one of two formats, the current json encoded format
// in bytes, or the legacy flatmap format as a map of strings.
message RawState {
    bytes json = 1;
    map<string, string> flatmap = 2;
}

// Schema is the configuration schema for a Resource, Provider, or Provisioner.
message Schema {
    message Block {
        int64 version = 1;
        repeated Attribute attributes = 2;
        repeated NestedBlock block_types = 3;
    }

    message Attribute {
        string name = 1;
        bytes type = 2;
        string description = 3;
        bool required = 4;
        bool optional = 5;
        bool computed = 6;
        bool sensitive = 7;
    }

    message NestedBlock {
        enum NestingMode {
            INVALID = 0;
            SINGLE = 1;
            LIST = 2;
            SET = 3;
            MAP = 4;
        }

        string type_name = 1;
        Block block = 2;
        NestingMode nesting = 3;
        int64 min_items = 4;
        int64 max_items = 5;
    }

    // The version of the schema.
    // Schemas are versioned, so that providers can upgrade a saved resource
    // state when the schema is changed. 
    int64 version = 1;

    // Block is the top level configuration block for this schema.
    Block block = 2;
}

service Provider {
    //////// Information about what a provider supports/expects
    rpc GetSchema(GetProviderSchema.Request) returns (GetProviderSchema.Response);
    rpc ValidateProviderConfig(ValidateProviderConfig.Request) returns (ValidateProviderConfig.Response);
    rpc ValidateResourceTypeConfig(ValidateResourceTypeConfig.Request) returns (ValidateResourceTypeConfig.Response);
    rpc ValidateDataSourceConfig(ValidateDataSourceConfig.Request) returns (ValidateDataSourceConfig.Response);
    rpc UpgradeResourceState(UpgradeResourceState.Request) returns (UpgradeResourceState.Response);

    //////// One-time initialization, called before other functions below
    rpc Configure(Configure.Request) returns (Configure.Response);

    //////// Managed Resource Lifecycle
    rpc ReadResource(ReadResource.Request) returns (ReadResource.Response);
    rpc PlanResourceChange(PlanResourceChange.Request) returns (PlanResourceChange.Response);
    rpc ApplyResourceChange(ApplyResourceChange.Request) returns (ApplyResourceChange.Response);
    rpc ImportResourceState(ImportResourceState.Request) returns (ImportResourceState.Response);

    rpc ReadDataSource(ReadDataSource.Request) returns (ReadDataSource.Response);

    //////// Graceful Shutdown
    rpc Stop(Stop.Request) returns (Stop.Response);
}

message GetProviderSchema {
    message Request {
    }
    message Response {
        Schema provider = 1;
        map<string, Schema> resource_schemas = 2;
        map<string, Schema> data_source_schemas = 3;
        repeated Diagnostic diagnostics = 4;
    }
}

message ValidateProviderConfig {
    message Request {
        DynamicValue config = 1;
    }
    message Response {
        repeated Diagnostic diagnostics = 1;
    }
}

message UpgradeResourceState {
    message Request {
        string type_name = 1;

        // version is the schema_version number recorded in the state file
        int64 version = 2;

        // raw_state is the raw states as stored for the resource.  Core does
        // not have access to the schema of prior_version, so it's the
        // provider's responsibility to interpret this value using the
        // appropriate older schema. The raw_state will be the json encoded
        // state, or a legacy flat-mapped format.
        RawState raw_state = 3;
    }
    message Response {
        // new_state is a msgpack-encoded data structure that, when interpreted with
        // the _current_ schema for this resource type, is functionally equivalent to
        // that which was given in prior_state_raw.
        DynamicValue upgraded_state = 1;

        // diagnostics describes any errors encountered during migration that could not
        // be safely resolved, and warnings about any possibly-risky assumptions made
        // in the upgrade process.
        repeated Diagnostic diagnostics = 2;
    }
}

message ValidateResourceTypeConfig {
    message Request {
        string type_name = 1;
        DynamicValue config = 2;
    }
    message Response {
        repeated Diagnostic diagnostics = 1;
    }
}

message ValidateDataSourceConfig {
    message Request {
        string type_name = 1;
        DynamicValue config = 2;
    }
    message Response {
        repeated Diagnostic diagnostics = 1;
    }
}

message Configure {
    message Request {
        string terraform_version = 1;
        DynamicValue config = 2;
    }
    message Response {
        repeated Diagnostic diagnostics = 1;
    }
}

message ReadResource {
    message Request {
        string type_name = 1;
        DynamicValue current_state = 2;
    }
    message Response {
        DynamicValue new_state = 1;
        repeated Diagnostic diagnostics = 2;
    }
}

message PlanResourceChange {
    message Request {
        string type_name = 1;
        DynamicValue prior_state = 2;
        DynamicValue proposed_new_state = 3;
        DynamicValue config = 4;
        bytes prior_private = 5; 
    }

    message Response {
        DynamicValue planned_state = 1;
        repeated AttributePath requires_replace = 2;
        bytes planned_private = 3; 
        repeated Diagnostic diagnostics = 4;
    }
}

message ApplyResourceChange {
    message Request {
        string type_name = 1;
        DynamicValue prior_state = 2;
        DynamicValue planned_state = 3;
        DynamicValue config = 4;
        bytes planned_private = 5; 
    }
    message Response {
        DynamicValue new_state = 1;
        bytes private = 2; 
        repeated Diagnostic diagnostics = 3;
    }
}

message ImportResourceState {
    message Request {
        string type_name = 1;
        string id = 2;
    }

    message ImportedResource {
        string type_name = 1;
        DynamicValue state = 2;
        bytes private = 3;
    }

    message Response {
        repeated ImportedResource imported_resources = 1;
        repeated Diagnostic diagnostics = 2;
    }
}

message ReadDataSource {
    message Request {
        string type_name = 1;
        DynamicValue config = 2;
    }
    message Response {
        DynamicValue state = 1;
        repeated Diagnostic diagnostics = 2;
    }
}

service Provisioner {
    rpc GetSchema(GetProvisionerSchema.Request) returns (GetProvisionerSchema.Response);
    rpc ValidateProvisionerConfig(ValidateProvisionerConfig.Request) returns (ValidateProvisionerConfig.Response);
    rpc ProvisionResource(ProvisionResource.Request) returns (stream ProvisionResource.Response);
    rpc Stop(Stop.Request) returns (Stop.Response);
}

message GetProvisionerSchema {
    message Request {
    }
    message Response {
        Schema provisioner = 1;
        repeated Diagnostic diagnostics = 2;
    }
}

message ValidateProvisionerConfig {
    message Request {
        DynamicValue config = 1;
    }
    message Response {
        repeated Diagnostic diagnostics = 1;
    }
}

message ProvisionResource {
    message Request {
        DynamicValue config = 1;
        DynamicValue connection = 2;
    }
    message Response {
        string output  = 1;
        repeated Diagnostic diagnostics = 2;
    }   
}