Refactoring Mooncake TE as a shared distributed component (#17810)

Signed-off-by: Shangming Cai <csmthu@gmail.com>

python/sglang/srt/disaggregation/mooncake/conn.py

@@ -27,11 +27,11 @@ from sglang.srt.disaggregation.common.utils import (
     FastQueue,
     group_concurrent_contiguous,
 )
-from sglang.srt.disaggregation.mooncake.transfer_engine import MooncakeTransferEngine
 from sglang.srt.disaggregation.mooncake.utils import (
     check_mooncake_custom_mem_pool_enabled,
 )
 from sglang.srt.disaggregation.utils import DisaggregationMode
+from sglang.srt.distributed.parallel_state import get_mooncake_transfer_engine
 from sglang.srt.environ import envs
 from sglang.srt.server_args import ServerArgs
 from sglang.srt.utils import format_tcp_address, is_valid_ipv6_address
@@ -239,11 +239,7 @@ class MooncakeKVManager(CommonKVManager):
         self.failure_lock = threading.Lock()
 
     def init_engine(self):
-        self.engine = MooncakeTransferEngine(
-            hostname=self.local_ip,
-            gpu_id=self.kv_args.gpu_id,
-            ib_device=self.kv_args.ib_device,
-        )
+        self.engine = get_mooncake_transfer_engine()
 
     def register_buffer_to_engine(self):
         # Batch register KV data buffers