dify/api/dify_graph/graph_engine/command_channels/README.md

Command Channels

Channel implementations for external workflow control.

Components

InMemoryChannel

Thread-safe in-memory queue for single-process deployments.

• fetch_commands() - Get pending commands
• send_command() - Add command to queue

RedisChannel

Redis-based queue for distributed deployments.

• fetch_commands() - Get commands with JSON deserialization
• send_command() - Store commands with TTL

Usage

# Local execution
channel = InMemoryChannel()
channel.send_command(AbortCommand(graph_id="workflow-123"))

# Distributed execution
redis_channel = RedisChannel(
    redis_client=redis_client,
    channel_key="workflow:123:commands"
)