SpiriSynq

SpiriSynq keeps Python dataclass instances in sync across processes, machines, and languages over a Zenoh pub/sub network. Define a typed dataclass, point multiple instances at the same topic, and field changes flow between them automatically.

from dataclasses import dataclass
from SpiriSynq.syncable_objects import SyncableObject

@dataclass
class Telemetry(SyncableObject):
    altitude: float = 0.0
    battery: int = 100

# Process A — owns the data
t = Telemetry("drone/telemetry", synq_authoritive=True)
t.altitude = 42.5  # published to the network automatically

# Process B — mirrors it
mirror = Telemetry.from_topic("drone/telemetry")
print(mirror.altitude)  # 42.5

Installation

pip install SpiriSynq

Requires Python 3.13+. A Zenoh router is optional for local use — peers discover each other directly.

How it works

Each syncable field maps to a Zenoh key expression <topic>/<field>. When a field changes, psygnal fires a signal, SpiriSynq serialises the new value to YAML, and publishes it. All subscribers on the same topic receive the update and apply it in-place without echo-looping it back.

Nested dataclass fields sync at the sub-field level: a change to robot.gps.latitude publishes to <topic>/gps/latitude, not <topic>/gps. Inherit from SubSyncableDataclass to make a nested type fully evented without Zenoh overhead; alternatively, use @dataclass(frozen=True) for immutable value objects that are replaced atomically.

Authoritative vs mirror

Sync is bidirectional — every instance both publishes its own changes and receives changes from others. synq_authoritive controls only the queryable side:

• Authoritative (synq_authoritive=True): registers Zenoh queryables for full-state rehydration on connect, @remote_method RPCs, and schema/discovery endpoints. Sets the base topic prefix from the hostname.
• Mirror (default): publishes and receives field changes just like an authoritative instance, but forwards RPC calls to the authoritative node rather than running them locally.

# Both sides can write — sync is bidirectional
counter = Counter("myapp/counter", synq_authoritive=True)
mirror = Counter.from_topic("myapp/counter")
mirror.value = 99  # received by counter

Remote methods

@remote_method exposes a method as a Zenoh queryable. Mirrors call it transparently — the call is routed to the authoritative node and the return value is sent back.

from SpiriSynq.remote_callables import remote_method

@dataclass
class Robot(SyncableObject):
    status: str = "idle"

    @remote_method
    def arm(self, mode: str = "auto") -> str:
        self.status = "armed"
        return f"armed in {mode} mode"

# From a mirror — works exactly like a local call
robot = Robot.from_topic("fleet/robot1")
result = robot.arm(mode="manual")  # "armed in manual mode"

Generator and async generator methods are supported. The mirror receives a regular Python generator that streams values as each reply arrives.

Custom timeouts: robot.arm.timeout(5.0)(mode="manual").

Discovery

from SpiriSynq.session import current_session

session = current_session.get()
for metadata in session.list_topics():
    print(metadata["topic"], metadata["classes"])

# Filter by type
for metadata in session.list_topics(type_filter="Robot"):
    robot = Robot.from_topic(metadata["topic"])

Cross-language compatibility

The wire format is plain Zenoh with YAML payloads. Any node that implements the SpiriSynq protocol — four mandatory queryables and per-field puts — is a first-class participant. No library required on the other end.

Key configuration options

Docs

• Overview
• Getting Started
• Concepts
• Protocol Specification