syntax = "proto3";

package neo.fs.v2.netmap;

option go_package = "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/netmap/grpc;netmap";
option csharp_namespace = "Neo.FileStorage.API.Netmap";

// Operations on filters
enum Operation {
  // No Operation defined
  OPERATION_UNSPECIFIED = 0;

  // Equal
  EQ = 1;

  // Not Equal
  NE = 2;

  // Greater then
  GT = 3;

  // Greater or equal
  GE = 4;

  // Less then
  LT = 5;

  // Less or equal
  LE = 6;

  // Logical OR
  OR = 7;

  // Logical AND
  AND = 8;

  // Logical negation
  NOT = 9;

  // Matches pattern
  LIKE = 10;
}

// Selector modifier shows how the node set will be formed. By default selector
// just groups nodes into a bucket by attribute, selecting nodes only by their
// hash distance.
enum Clause {
  // No modifier defined. Nodes will be selected from the bucket randomly
  CLAUSE_UNSPECIFIED = 0;

  // SAME will select only nodes having the same value of bucket attribute
  SAME = 1;

  // DISTINCT will select nodes having different values of bucket attribute
  DISTINCT = 2;
}

// This filter will return the subset of nodes from `NetworkMap` or another
// filter's results that will satisfy filter's conditions.
message Filter {
  // Name of the filter or a reference to a named filter. '*' means
  // application to the whole unfiltered NetworkMap. At top level it's used as a
  // filter name. At lower levels it's considered to be a reference to another
  // named filter
  string name = 1 [ json_name = "name" ];

  // Key to filter
  string key = 2 [ json_name = "key" ];

  // Filtering operation
  Operation op = 3 [ json_name = "op" ];

  // Value to match
  string value = 4 [ json_name = "value" ];

  // List of inner filters. Top level operation will be applied to the whole
  // list.
  repeated Filter filters = 5 [ json_name = "filters" ];
}

// Selector chooses a number of nodes from the bucket taking the nearest nodes
// to the provided `ContainerID` by hash distance.
message Selector {
  // Selector name to reference in object placement section
  string name = 1 [ json_name = "name" ];

  // How many nodes to select from the bucket
  uint32 count = 2 [ json_name = "count" ];

  // Selector modifier showing how to form a bucket
  Clause clause = 3 [ json_name = "clause" ];

  // Bucket attribute to select from
  string attribute = 4 [ json_name = "attribute" ];

  // Filter reference to select from
  string filter = 5 [ json_name = "filter" ];
}

// Number of object replicas in a set of nodes from the defined selector. If no
// selector set, the root bucket containing all possible nodes will be used by
// default.
message Replica {
  // How many object replicas to put
  uint32 count = 1 [ json_name = "count" ];

  // Named selector bucket to put replicas
  string selector = 2 [ json_name = "selector" ];

  // Data shards count
  uint32 ec_data_count = 3 [ json_name = "ecDataCount" ];

  // Parity shards count
  uint32 ec_parity_count = 4 [ json_name = "ecParityCount" ];
}

// Set of rules to select a subset of nodes from `NetworkMap` able to store
// container's objects. The format is simple enough to transpile from different
// storage policy definition languages.
message PlacementPolicy {
  // Rules to set number of object replicas and place each one into a named
  // bucket
  repeated Replica replicas = 1 [ json_name = "replicas" ];

  // Container backup factor controls how deep FrostFS will search for nodes
  // alternatives to include into container's nodes subset
  uint32 container_backup_factor = 2 [ json_name = "containerBackupFactor" ];

  // Set of Selectors to form the container's nodes subset
  repeated Selector selectors = 3 [ json_name = "selectors" ];

  // List of named filters to reference in selectors
  repeated Filter filters = 4 [ json_name = "filters" ];

  // Unique flag defines non-overlapping application for replicas
  bool unique = 5 [ json_name = "unique" ];
}

// FrostFS node description
message NodeInfo {
  // Public key of the FrostFS node in a binary format
  bytes public_key = 1 [ json_name = "publicKey" ];

  // Ways to connect to a node
  repeated string addresses = 2 [ json_name = "addresses" ];

  // Administrator-defined Attributes of the FrostFS Storage Node.
  //
  // `Attribute` is a Key-Value metadata pair. Key name must be a valid UTF-8
  // string. Value can't be empty.
  //
  // Attributes can be constructed into a chain of attributes: any attribute can
  // have a parent attribute and a child attribute (except the first and the
  // last one). A string representation of the chain of attributes in FrostFS
  // Storage Node configuration uses ":" and "/" symbols, e.g.:
  //
  //        `FrostFS_NODE_ATTRIBUTE_1=key1:val1/key2:val2`
  //
  // Therefore the string attribute representation in the Node configuration
  // must use "\:", "\/" and "\\" escaped symbols if any of them appears in an
  // attribute's key or value.
  //
  // Node's attributes are mostly used during Storage Policy evaluation to
  // calculate object's placement and find a set of nodes satisfying policy
  // requirements. There are some "well-known" node attributes common to all the
  // Storage Nodes in the network and used implicitly with default values if not
  // explicitly set:
  //
  // * Capacity \
  //   Total available disk space in Gigabytes.
  // * Price \
  //   Price in GAS tokens for storing one GB of data during one Epoch. In node
  //   attributes it's a string presenting floating point number with comma or
  //   point delimiter for decimal part. In the Network Map it will be saved as
  //   64-bit unsigned integer representing number of minimal token fractions.
  // * UN-LOCODE \
  //   Node's geographic location in
  //   [UN/LOCODE](https://www.unece.org/cefact/codesfortrade/codes_index.html)
  //   format approximated to the nearest point defined in the standard.
  // * CountryCode \
  //   Country code in
  //   [ISO 3166-1_alpha-2](https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2)
  //   format. Calculated automatically from `UN-LOCODE` attribute.
  // * Country \
  //   Country short name in English, as defined in
  //   [ISO-3166](https://www.iso.org/obp/ui/#search). Calculated automatically
  //   from `UN-LOCODE` attribute.
  // * Location \
  //   Place names are given, whenever possible, in their national language
  //   versions as expressed in the Roman alphabet using the 26 characters of
  //   the character set adopted for international trade data interchange,
  //   written without diacritics . Calculated automatically from `UN-LOCODE`
  //   attribute.
  // * SubDivCode \
  //   Country's administrative subdivision where node is located. Calculated
  //   automatically from `UN-LOCODE` attribute based on `SubDiv` field.
  //   Presented in [ISO 3166-2](https://en.wikipedia.org/wiki/ISO_3166-2)
  //   format.
  // * SubDiv \
  //   Country's administrative subdivision name, as defined in
  //   [ISO 3166-2](https://en.wikipedia.org/wiki/ISO_3166-2). Calculated
  //   automatically from `UN-LOCODE` attribute.
  // * Continent \
  //   Node's continent name according to the [Seven-Continent
  //   model](https://en.wikipedia.org/wiki/Continent#Number). Calculated
  //   automatically from `UN-LOCODE` attribute.
  // * ExternalAddr
  //   Node's preferred way for communications with external clients.
  //   Clients SHOULD use these addresses if possible.
  //   Must contain a comma-separated list of multi-addresses.
  //
  // For detailed description of each well-known attribute please see the
  // corresponding section in FrostFS Technical Specification.
  message Attribute {
    // Key of the node attribute
    string key = 1 [ json_name = "key" ];

    // Value of the node attribute
    string value = 2 [ json_name = "value" ];

    // Parent keys, if any. For example for `City` it could be `Region` and
    // `Country`.
    repeated string parents = 3 [ json_name = "parents" ];
  }
  // Carries list of the FrostFS node attributes in a key-value form. Key name
  // must be a node-unique valid UTF-8 string. Value can't be empty. NodeInfo
  // structures with duplicated attribute names or attributes with empty values
  // will be considered invalid.
  repeated Attribute attributes = 3 [ json_name = "attributes" ];

  // Represents the enumeration of various states of the FrostFS node.
  enum State {
    // Unknown state
    UNSPECIFIED = 0;

    // Active state in the network
    ONLINE = 1;

    // Network unavailable state
    OFFLINE = 2;

    // Maintenance state
    MAINTENANCE = 3;
  }

  // Carries state of the FrostFS node
  State state = 4 [ json_name = "state" ];
}

// Network map structure
message Netmap {
  // Network map revision number.
  uint64 epoch = 1 [ json_name = "epoch" ];

  // Nodes presented in network.
  repeated NodeInfo nodes = 2 [ json_name = "nodes" ];
}

// FrostFS network configuration
message NetworkConfig {
  // Single configuration parameter. Key MUST be network-unique.
  //
  // System parameters:
  // - **AuditFee** \
  //   Fee paid by the storage group owner to the Inner Ring member.
  //   Value: little-endian integer. Default: 0.
  // - **BasicIncomeRate** \
  //   Cost of storing one gigabyte of data for a period of one epoch. Paid by
  //   container owner to container nodes.
  //   Value: little-endian integer. Default: 0.
  // - **ContainerAliasFee** \
  //   Fee paid for named container's creation by the container owner.
  //   Value: little-endian integer. Default: 0.
  // - **ContainerFee** \
  //   Fee paid for container creation by the container owner.
  //   Value: little-endian integer. Default: 0.
  // - **EpochDuration** \
  //   FrostFS epoch duration measured in Sidechain blocks.
  //   Value: little-endian integer. Default: 0.
  // - **HomomorphicHashingDisabled** \
  //   Flag of disabling the homomorphic hashing of objects' payload.
  //   Value: true if any byte != 0. Default: false.
  // - **InnerRingCandidateFee** \
  //   Fee for entrance to the Inner Ring paid by the candidate.
  //   Value: little-endian integer. Default: 0.
  // - **MaintenanceModeAllowed** \
  //   Flag allowing setting the MAINTENANCE state to storage nodes.
  //   Value: true if any byte != 0. Default: false.
  // - **MaxObjectSize** \
  //   Maximum size of physically stored FrostFS object measured in bytes.
  //   Value: little-endian integer. Default: 0.
  //
  //   This value refers to the maximum size of a **physically** stored object
  //   in FrostFS. However, from a user's perspective, the **logical** size of a
  //   stored object can be significantly larger. The relationship between the
  //   physical and logical object sizes is governed by the following formula
  //
  //   ```math
  //   \mathrm{Stored\ Object\ Size} \le
  //   \frac{
  //     \left(\mathrm{Max\ Object\ Size}\right)^2
  //   }{
  //     \mathrm{Object\ ID\ Size}
  //   }
  //   ```
  //
  //   This arises from the fact that a tombstone, also being an object, stores
  //   the IDs of inhumed objects and cannot be divided into smaller objects,
  //   thus having an upper limit for its size.
  //
  //   For example, if:
  //   * Max Object Size Size = 64 MiB;
  //   * Object ID Size = 32 B;
  //
  //   then:
  //   ```math
  //     \mathrm{Stored\ Object\ Size} \le
  //     \frac{\left(64\ \mathrm{MiB}\right)^2}{32\ \mathrm{B}} =
  //     \frac{2^{52}}{2^5}\ \mathrm{B} =
  //     2^{47}\ \mathrm{B} =
  //     128\ \mathrm{TiB}
  //   ```
  // - **WithdrawFee** \
  //   Fee paid for withdrawal of funds paid by the account owner.
  //   Value: little-endian integer. Default: 0.
  // - **MaxECDataCount** \
  //   Maximum number of data shards for EC placement policy.
  //   Value: little-endian integer. Default: 0.
  // - **MaxECParityCount** \
  //   Maximum number of parity shards for EC placement policy.
  //   Value: little-endian integer. Default: 0.
  message Parameter {
    // Parameter key. UTF-8 encoded string
    bytes key = 1 [ json_name = "key" ];

    // Parameter value
    bytes value = 2 [ json_name = "value" ];
  }
  // List of parameter values
  repeated Parameter parameters = 1 [ json_name = "parameters" ];
}

// Information about FrostFS network
message NetworkInfo {
  // Number of the current epoch in the FrostFS network
  uint64 current_epoch = 1 [ json_name = "currentEpoch" ];

  // Magic number of the sidechain of the FrostFS network
  uint64 magic_number = 2 [ json_name = "magicNumber" ];

  // MillisecondsPerBlock network parameter of the sidechain of the FrostFS
  // network
  int64 ms_per_block = 3 [ json_name = "msPerBlock" ];

  // FrostFS network configuration
  NetworkConfig network_config = 4 [ json_name = "networkConfig" ];
}