syntax = "proto3";

package neo.fs.v2.reputation;

option go_package = "github.com/TrueCloudLab/frostfs-api-go/v2/reputation/grpc;reputation";
option csharp_namespace = "Neo.FileStorage.API.Reputation";

import "reputation/types.proto";
import "session/types.proto";

// `ReputationService` provides mechanisms for exchanging trust values with
// other NeoFS nodes. Nodes rate each other's reputation based on how good they
// process requests and set a trust level based on that rating. The trust
// information is passed to the next nodes to check and aggregate unless the
// final result is recorded.
service ReputationService {
    // Announce local client trust information to any node in NeoFS network.
    //
    // Statuses:
    // - **OK** (0, SECTION_SUCCESS):
    // local trust has been successfully announced;
    // - Common failures (SECTION_FAILURE_COMMON).
    rpc AnnounceLocalTrust (AnnounceLocalTrustRequest) returns (AnnounceLocalTrustResponse);

    // Announce the intermediate result of the iterative algorithm for
    // calculating the global reputation of the node in NeoFS network.
    //
    // Statuses:
    // - **OK** (0, SECTION_SUCCESS):
    // intermediate trust estimation has been successfully announced;
    // - Common failures (SECTION_FAILURE_COMMON).
    rpc AnnounceIntermediateResult (AnnounceIntermediateResultRequest) returns (AnnounceIntermediateResultResponse);
}

// Announce node's local trust information.
message AnnounceLocalTrustRequest {
    // Announce node's local trust information.
    message Body {
        // Trust assessment Epoch number
        uint64 epoch = 1;

        // List of normalized local trust values to other NeoFS nodes. The value
        // is calculated according to EigenTrust++ algorithm and must be a
        // floating point number in [0;1] range.
        repeated Trust trusts = 2;
    }

    // Body of the request message.
    Body body = 1;

    // Carries request meta information. Header data is used only to regulate
    // message transport and does not affect request execution.
    neo.fs.v2.session.RequestMetaHeader meta_header = 2;

    // Carries request verification information. This header is used to
    // authenticate the nodes of the message route and check the correctness of
    // transmission.
    neo.fs.v2.session.RequestVerificationHeader verify_header = 3;
}

// Node's local trust information announcement response.
message AnnounceLocalTrustResponse {
    // Response to the node's local trust information announcement has an empty body
    // because the trust exchange operation is asynchronous. If Trust information
    // does not pass sanity checks, it is silently ignored.
    message Body {
    }

    // Body of the response message.
    Body body = 1;

    // Carries response meta information. Header data is used only to regulate
    // message transport and does not affect request execution.
    neo.fs.v2.session.ResponseMetaHeader meta_header = 2;

    // Carries response verification information. This header is used to
    // authenticate the nodes of the message route and check the correctness of
    // transmission.
    neo.fs.v2.session.ResponseVerificationHeader verify_header = 3;
}

// Announce intermediate global trust information.
message AnnounceIntermediateResultRequest {
    // Announce intermediate global trust information.
    message Body {
        // Iteration execution Epoch number
        uint64 epoch = 1;

        // Iteration sequence number
        uint32 iteration = 2;

        // Current global trust value calculated at the specified iteration
        PeerToPeerTrust trust = 3;
    }

    // Body of the request message.
    Body body = 1;

    // Carries request meta information. Header data is used only to regulate
    // message transport and does not affect request execution.
    neo.fs.v2.session.RequestMetaHeader meta_header = 2;

    // Carries request verification information. This header is used to
    // authenticate the nodes of the message route and check the correctness of
    // transmission.
    neo.fs.v2.session.RequestVerificationHeader verify_header = 3;
}

// Intermediate global trust information announcement response.
message AnnounceIntermediateResultResponse {
    // Response to the node's intermediate global trust information announcement has
    // an empty body because the trust exchange operation is asynchronous. If
    // Trust information does not pass sanity checks, it is silently ignored.
    message Body {
    }

    // Body of the response message.
    Body body = 1;

    // Carries response meta information. Header data is used only to regulate
    // message transport and does not affect request execution.
    neo.fs.v2.session.ResponseMetaHeader meta_header = 2;

    // Carries response verification information. This header is used to
    // authenticate the nodes of the message route and check the correctness of
    // transmission.
    neo.fs.v2.session.ResponseVerificationHeader verify_header = 3;
}