openim-sdk-core 0.1.3

Python SDK for OpenIM-style login, messaging, and websocket sync.

openim_sdk

Python SDK for OpenIM-style login, send message, and receive message.

Modes

• OpenIMWSSDK (recommended): websocket direct connection (gob + gzip + protobuf) with heartbeat and auto reconnect.
• OpenIMSDK: HTTP polling fallback.

WebSocket quick start

from openim_sdk import OpenIMWSSDK, WSConfig

sdk = OpenIMWSSDK(
    WSConfig(ws_addr="ws://127.0.0.1:10001/msg_gateway", data_dir="./openim_py_data")
)
sdk.login(user_id="u1", token="YOUR_TOKEN")
sdk.start()
sdk.send_text("hello", recv_id="u2")

See openim_sdk/example_ws.py for a runnable demo script.

WebSocket detailed usage

1. Build config

WSConfig parameters:

• ws_addr (required): websocket gateway address, e.g. ws://127.0.0.1:10001/msg_gateway
• api_addr: HTTP API address for profile fetch (used to cache self info for send), e.g. http://127.0.0.1:10002; when empty, sdk falls back to env OPENIM_API_ADDR
• data_dir: local sqlite directory, default ./data
• platform_id: platform ID sent to server, default 1
• timeout_seconds: request/response wait timeout, default 1000
• pull_batch_size: sync page size, default 100
• sdk_version: value sent in ws query, default python-ws-0.1.0
• auto_sync_on_connect: run sync_once() immediately after first connect, default False
• auto_sync_on_reconnect: auto sync after reconnect, default True
• auto_reconnect: reconnect automatically on disconnect, default True
• max_reconnect_attempts: reconnect attempt cap, default 300
• reconnect_backoff_seconds: reconnect interval sequence, default (1, 2, 4, 8, 16)
• enable_heartbeat: send ws ping periodically, default True
• heartbeat_interval_seconds: ping interval, default 24
• heartbeat_pong_timeout_seconds: pong timeout, default 30
• self_user_info_cache_ttl_seconds: in-memory cache ttl for self profile (senderNickname/senderFaceURL), default 600 seconds

2. Register callbacks

Available callbacks in OpenIMWSSDK(...):

• on_recv_new_message(msg: WSMessage): called for online real-time messages
• on_recv_offline_new_message(msg: WSMessage): called for offline/sync messages
• on_connecting(): called before connect/reconnect attempts
• on_connect_success(): called after successful connect/reconnect
• on_connect_failed(exc): called when one connect attempt fails
• on_kicked_offline(): called when server returns kick event
• on_error(exc): called on internal errors (decode/send/read/reconnect, etc.)
• logger(text): sdk log output callback

2.1 WSMessage fields

Raw payload keys:

• conversationID: conversation id (sdk adds this key)
• sendID, recvID, groupID
• clientMsgID, serverMsgID
• senderPlatformID, senderNickname, senderFaceURL
• sessionType (1 single, 2 group, 3 super group)
• msgFrom, contentType, content
• seq, sendTime, createTime
• status, isRead
• options (dict[str, bool])
• offlinePushInfo (dict)
• atUserIDList (list[str])
• attachedInfo, ex

Python field names in WSMessage:

• conversation_id, send_id, recv_id, group_id
• client_msg_id, server_msg_id
• sender_platform_id, sender_nickname, sender_face_url
• session_type, msg_from, content_type, content
• seq, send_time, create_time, status, is_read
• options, offline_push_info, at_user_id_list, attached_info, ex
• raw: original dictionary payload
• content_json: parsed JSON from content (or None when not valid JSON)
• content_obj: typed content object parsed by content_type

content_type -> content_obj mapping (same as sdk_struct.go):

• 101 -> TextElem
• 102 -> PictureElem
• 103 -> SoundElem
• 104 -> VideoElem
• 105 -> FileElem
• 106 -> AtTextElem
• 107 -> MergeElem
• 108 -> CardElem
• 109 -> LocationElem
• 110/119/120 -> CustomElem
• 113 -> TypingElem
• 114 -> QuoteElem
• 115 -> FaceElem
• 117 -> AdvancedTextElem
• 118 -> MarkdownTextElem
• other content types -> NotificationElem

Minimal callback example:

from openim_sdk import OpenIMWSSDK, WSConfig, WSMessage, TextElem, PictureElem


def on_new_model(msg: WSMessage) -> None:
    if isinstance(msg.content_obj, TextElem):
        print("[text]", msg.content_obj.content)
    elif isinstance(msg.content_obj, PictureElem):
        print("[picture]", msg.content_obj.source_picture)
    else:
        print("[other]", msg.content_type, msg.content_obj)


sdk = OpenIMWSSDK(
    WSConfig(ws_addr="ws://127.0.0.1:10001/msg_gateway"),
    on_recv_new_message=on_new_model,
)

3. Full example (recommended pattern)

import time

from openim_sdk import OpenIMWSSDK, TextElem, WSConfig, WSSDKError, WSMessage


def on_new(msg: WSMessage) -> None:
    if isinstance(msg.content_obj, TextElem):
        print("[new text]", msg.send_id, "->", msg.recv_id, msg.content_obj.content)
    else:
        print("[new]", msg.send_id, "->", msg.recv_id, msg.content_type, msg.content_obj)


def on_offline(msg: WSMessage) -> None:
    print("[offline]", msg.client_msg_id, msg.seq)


def on_err(exc: Exception) -> None:
    print("[error]", exc)


sdk = OpenIMWSSDK(
    WSConfig(
        ws_addr="ws://127.0.0.1:10001/msg_gateway",
        api_addr="http://127.0.0.1:10002",
        data_dir="./openim_py_data",
        auto_sync_on_connect=True,
        auto_sync_on_reconnect=True,
    ),
    on_recv_new_message=on_new,
    on_recv_offline_new_message=on_offline,
    on_connecting=lambda: print("[ws] connecting"),
    on_connect_success=lambda: print("[ws] connected"),
    on_connect_failed=lambda e: print("[ws] connect failed:", e),
    on_kicked_offline=lambda: print("[ws] kicked offline"),
    on_error=on_err,
    logger=lambda s: print("[sdk]", s),
)

try:
    # 1) login first
    sdk.login(user_id="u1", token="YOUR_TOKEN")
    # 2) then start websocket threads
    sdk.start()

    # send peer message
    ack = sdk.send_text("hello from ws sdk", recv_id="u2")
    print("send ack:", ack)  # {"serverMsgID": "...", "clientMsgID": "...", "sendTime": ...}

    # keep process alive
    while True:
        time.sleep(1)
except WSSDKError as e:
    print("business error:", e.err_code, e.err_msg)
except KeyboardInterrupt:
    pass
finally:
    # stop background threads and close db
    sdk.logout()

4. Sending messages

• Single chat:

sdk.send_text("hello", recv_id="u2")

• Group chat:

sdk.send_text("hello group", group_id="g123", session_type=2)

send_text(...) notes:

• must pass one of recv_id or group_id
• session_type defaults to single chat (1) if recv_id is set, otherwise group (2)
• if WSConfig.api_addr is set, sdk fetches self profile (/user/get_users_info) and caches it in memory (ttl controlled by self_user_info_cache_ttl_seconds, default 10 minutes), then auto-fills senderNickname and senderFaceURL on send
• supported session values:
  • 1: single chat
  • 2: group chat
  • 3: super group chat

5. Manual sync

If you want explicit control (instead of auto_sync_on_connect/reconnect), call:

sdk.sync_once()

This pulls missing seq ranges and dispatches them through on_recv_offline_new_message.

6. Lifecycle and best practices

• call order should be: login(...) -> start() -> send/recv -> logout()
• stop() only stops ws threads; logout() stops threads and closes local storage
• keep your process alive after start(), otherwise daemon threads exit with process
• for production:
  • keep auto_reconnect=True
  • keep heartbeat enabled
  • handle on_error and on_connect_failed for observability/retry alerts
  • persist your own app-level offsets/state if required

HTTP polling quick start

from openim_sdk import OpenIMSDK, SDKConfig

sdk = OpenIMSDK(
    SDKConfig(api_addr="http://127.0.0.1:10002", data_dir="./openim_py_data")
)
sdk.login(user_id="u1", token="YOUR_TOKEN")
sdk.start_receiving()
sdk.send_text("hello", recv_id="u2")
me = sdk.get_self_user_info()
print(me.user_id, me.nickname, me.face_url)

WebSocket features

• Login with user_id + token
• Send text message with protobuf payload (MsgData)
• Receive PushMessages from ws binary frames
• Gob encode/decode for GeneralWsReq/GeneralWsResp
• Gzip frame compression/decompression
• Heartbeat (ping/pong)
• Auto reconnect with backoff (1,2,4,8,16 seconds loop by default)
• Auto sync missed messages on connect/reconnect
• Local SQLite persistence:
  • message rows
  • per-conversation latest synced seq

Local database

• WS mode: <data_dir>/OpenIM_pyws_<user_id>.db
• HTTP mode: <data_dir>/OpenIM_py_<user_id>.db

Tables:

• conversation_seq(conversation_id, last_seq)
• messages(...)