# Source code for tensorplay.distributed.elastic.rendezvous.static_tcp_rendezvous

Source: https://www.tensorplay.cn/docs/_modules/tensorplay/distributed/elastic/rendezvous/static_tcp_rendezvous.html

```
"""Fixed-size rendezvous over a pre-agreed store endpoint.

All participants agree on ``host:port`` out of band; the node with
``node_rank == 0`` hosts the store server and everyone else connects. The
resulting ranks mirror the node ranks, which makes this backend suitable for
homogeneous, statically-sized jobs.
"""
from tensorplay.distributed import PrefixStore, TCPStore

from .api import (
    RendezvousConnectionError,
    RendezvousHandler,
    RendezvousInfo,
    RendezvousParameters,
    RendezvousStoreInfo,
)
from .utils import parse_rendezvous_endpoint

[docs]
class StaticTCPRendezvous(RendezvousHandler):
    """One-shot rendezvous over a static TCPStore endpoint."""

    def __init__(
        self,
        params: RendezvousParameters | str,
        master_port: int | None = None,
        rank: int = 0,
        world_size: int = 1,
        run_id: str = "",
        timeout: int = 600,
    ) -> None:
        if isinstance(params, RendezvousParameters):
            self._params = params
            self._endpoint = params.endpoint
            self._run_id = params.run_id
            self._rank = params.node_rank
            host, port = parse_rendezvous_endpoint(self._endpoint, default_port=29400)
            if not self._endpoint:
                port = 0
            self._host = host
            self._port = port
            self._num_nodes = params.max_nodes
            read_timeout = params.get_as_int(
                "read_timeout", int(params.timeout.join.total_seconds())
            )
            is_master = params.node_rank == 0 and params.get_as_bool(
                "start_daemon", True
            )
        else:
            self._params = None
            self._endpoint = f"{params}:{master_port}"
            self._run_id = run_id
            self._rank = int(rank)
            self._host = params
            self._port = int(master_port or 0)
            self._num_nodes = int(world_size)
            read_timeout = int(timeout)
            is_master = self._rank == 0
        try:
            self._store = TCPStore(
                self._host,
                self._port,
                world_size=self._num_nodes,
                is_master=is_master,
                timeout=float(read_timeout),
                wait_for_workers=False,
            )
        except OSError as e:
            raise RendezvousConnectionError(
                f"Failed to bind or connect to the static rendezvous endpoint "
                f"{self._host}:{self._port}: {e}"
            ) from e

    def get_backend(self) -> str:
        return "static"

    @property
    def use_agent_store(self) -> bool:
        # The store lives in the agent process of node 0.
        return True

    def next_rendezvous(self) -> RendezvousInfo:
        bootstrap = RendezvousStoreInfo.build(
            rank=self._rank,
            store=self._store,
            local_addr=self._params.local_addr if self._params else self._host,
            server_port=self._port or None,
        )
        return RendezvousInfo(
            store=PrefixStore(self._run_id, self._store),
            rank=self._rank,
            world_size=self._num_nodes,
            bootstrap_store_info=bootstrap,
        )

    def is_closed(self) -> bool:
        return False

    def set_closed(self) -> None:
        return

    def num_nodes_waiting(self) -> int:
        return 0

    def get_run_id(self) -> str:
        return self._run_id

    def shutdown(self) -> bool:
        return True

def create_rdzv_handler(params: RendezvousParameters) -> StaticTCPRendezvous:
    endpoint = params.endpoint.strip()
    if not endpoint:
        raise ValueError("endpoint is absent in RendezvousParameters")
    rank = params.get_as_int("rank")
    if rank is None:
        rank = params.node_rank
    return StaticTCPRendezvous(params)

def create_handler(params: RendezvousParameters) -> StaticTCPRendezvous:
    return create_rdzv_handler(params)
```