groups:
  - id: rpc
    prefix: rpc
    type: span
    brief: 'This document defines semantic conventions for remote procedure calls.'
    events: [rpc.message]
    attributes:
      - id: system
        requirement_level: required
        brief: 'A string identifying the remoting system. See below for a list of well-known identifiers.'
        type:
          allow_custom_values: true
          members:
            - id: grpc
              value: 'grpc'
              brief: 'gRPC'
            - id: java_rmi
              value: 'java_rmi'
              brief: 'Java RMI'
            - id: dotnet_wcf
              value: 'dotnet_wcf'
              brief: '.NET WCF'
            - id: apache_dubbo
              value: 'apache_dubbo'
              brief: 'Apache Dubbo'
            - id: connect_rpc
              value: 'connect_rpc'
              brief: 'Connect RPC'
      - id: service
        type: string
        requirement_level: recommended
        brief: 'The full (logical) name of the service being called, including its package name, if applicable.'
        note: >
          This is the logical name of the service from the RPC interface perspective,
          which can be different from the name of any implementing class.
          The `code.namespace` attribute may be used to store the latter
          (despite the attribute name, it may include a class name;
          e.g., class with method actually executing the call on the server side,
          RPC client stub class on the client side).
        examples: "myservice.EchoService"
      - id: method
        type: string
        requirement_level: recommended
        brief: 'The name of the (logical) method being called, must be equal to the $method part in the span name.'
        note: >
          This is the logical name of the method from the RPC interface perspective,
          which can be different from the name of any implementing method/function.
          The `code.function` attribute may be used to store the latter
          (e.g., method actually executing the call on the server side,
          RPC client stub method on the client side).
        examples: "exampleMethod"
      - ref: net.sock.peer.addr
      - ref: net.sock.peer.port
        requirement_level:
          recommended: If different than `net.peer.port` and if `net.sock.peer.addr` is set.
      - ref: net.sock.family
        requirement_level:
          conditionally_required: If and only if `net.sock.peer.addr` is set.
      - ref: net.sock.peer.name
        requirement_level:
          recommended: If different than `net.peer.name` and if `net.sock.peer.addr` is set.
      - ref: net.peer.name
        requirement_level: required
        brief: >
          RPC server [host name](https://grpc.github.io/grpc/core/md_doc_naming.html).
        note: >
          May contain server IP address, DNS name, or local socket name. When host component is an IP address,
          instrumentations SHOULD NOT do a reverse proxy lookup to obtain DNS name and SHOULD set
          `net.peer.name` to the IP address provided in the host component.
      - ref: net.peer.port
        requirement_level:
          conditionally_required: See below
      - ref: net.transport
        requirement_level:
          conditionally_required: See below
    constraints:
      - any_of:
          - net.sock.peer.addr
          - net.peer.name
      - include: network

  - id: rpc.server
    prefix: rpc
    type: span
    extends: rpc
    span_kind: server
    brief: 'Semantic Convention for RPC server spans'
    attributes:
      - ref: net.host.name
      - ref: net.sock.host.addr
      - ref: net.sock.host.port
      - ref: net.sock.family

  - id: rpc.grpc
    prefix: rpc.grpc
    type: span
    extends: rpc
    brief: 'Tech-specific attributes for gRPC.'
    attributes:
      - id: status_code
        type:
          members:
            - id: ok
              brief: OK
              value: 0
            - id: cancelled
              brief: CANCELLED
              value: 1
            - id: unknown
              brief: UNKNOWN
              value: 2
            - id: invalid_argument
              brief: INVALID_ARGUMENT
              value: 3
            - id: deadline_exceeded
              brief: DEADLINE_EXCEEDED
              value: 4
            - id: not_found
              brief: NOT_FOUND
              value: 5
            - id: already_exists
              brief: ALREADY_EXISTS
              value: 6
            - id: permission_denied
              brief: PERMISSION_DENIED
              value: 7
            - id: resource_exhausted
              brief: RESOURCE_EXHAUSTED
              value: 8
            - id: failed_precondition
              brief: FAILED_PRECONDITION
              value: 9
            - id: aborted
              brief: ABORTED
              value: 10
            - id: out_of_range
              brief: OUT_OF_RANGE
              value: 11
            - id: unimplemented
              brief: UNIMPLEMENTED
              value: 12
            - id: internal
              brief: INTERNAL
              value: 13
            - id: unavailable
              brief: UNAVAILABLE
              value: 14
            - id: data_loss
              brief: DATA_LOSS
              value: 15
            - id: unauthenticated
              brief: UNAUTHENTICATED
              value: 16
        requirement_level: required
        brief: "The [numeric status code](https://github.com/grpc/grpc/blob/v1.33.2/doc/statuscodes.md) of the gRPC request."

  - id: rpc.jsonrpc
    prefix: rpc.jsonrpc
    type: span
    extends: rpc
    brief: 'Tech-specific attributes for [JSON RPC](https://www.jsonrpc.org/).'
    attributes:
      - id: version
        type: string
        requirement_level:
          conditionally_required: If other than the default version (`1.0`)
        brief: "Protocol version as in `jsonrpc` property of request/response. Since JSON-RPC 1.0 does not specify this, the value can be omitted."
        examples: ['2.0', '1.0']
      - id: request_id
        type: string
        brief: >
          `id` property of request or response.
          Since protocol allows id to be int, string, `null` or missing (for notifications),
          value is expected to be cast to string for simplicity.
          Use empty string in case of `null` value. Omit entirely if this is a notification.
        examples: ['10', 'request-7', '']
      - id: error_code
        type: int
        requirement_level:
          conditionally_required: If response is not successful.
        brief: "`error.code` property of response if it is an error response."
        examples: [-32700, 100]
      - id: error_message
        type: string
        brief: "`error.message` property of response if it is an error response."
        examples: ['Parse error', 'User already exists']
      - ref: rpc.method
        requirement_level: required
        note: >
          This is always required for jsonrpc. See the note in the general
          RPC conventions for more information.

  - id: rpc.message
    prefix: "message"  # TODO: Change the prefix to rpc.message?
    type: event
    brief: "RPC received/sent message."
    attributes:
      - id: type
        type:
          members:
            - id: sent
              value: "SENT"
            - id: received
              value: "RECEIVED"
        brief: "Whether this is a received or sent message."
      - id: id
        type: int
        brief: "MUST be calculated as two different counters starting from `1` one for sent messages and one for received message."
        note: "This way we guarantee that the values will be consistent between different implementations."
      - id: compressed_size
        type: int
        brief: "Compressed size of the message in bytes."
      - id: uncompressed_size
        type: int
        brief: "Uncompressed size of the message in bytes."

  - id: rpc.connect_rpc
    prefix: rpc.connect_rpc
    type: span
    extends: rpc
    brief: 'Tech-specific attributes for Connect RPC.'
    attributes:
      - id: error_code
        type:
          members:
            - id: cancelled
              value: cancelled
            - id: unknown
              value: unknown
            - id: invalid_argument
              value: invalid_argument
            - id: deadline_exceeded
              value: deadline_exceeded
            - id: not_found
              value: not_found
            - id: already_exists
              value: already_exists
            - id: permission_denied
              value: permission_denied
            - id: resource_exhausted
              value: resource_exhausted
            - id: failed_precondition
              value: failed_precondition
            - id: aborted
              value: aborted
            - id: out_of_range
              value: out_of_range
            - id: unimplemented
              value: unimplemented
            - id: internal
              value: internal
            - id: unavailable
              value: unavailable
            - id: data_loss
              value: data_loss
            - id: unauthenticated
              value: unauthenticated
        requirement_level:
          conditionally_required: If response is not successful and if error code available.
        brief: "The [error codes](https://connect.build/docs/protocol/#error-codes) of the Connect request. Error codes are always string values."