Publisher Example

This page provides comprehensive examples of publishing events to OmniDaemon, from simple one-liners to advanced patterns with all features.

Overview

What This Guide Covers:

✅ Simple publishing (minimal code)
✅ Full publishing (all parameters)
✅ Batch publishing (multiple events)
✅ Webhook callbacks
✅ Reply-to patterns (agent-to-agent)
✅ Correlation and causation tracking
✅ Multi-tenancy with tenant_id
✅ Custom source tracking
✅ Result retrieval (24h TTL)

Prerequisites

1. Install OmniDaemon

# Recommended: uv (fast & modern)
uv add omnidaemon

# Or with pip:
pip install omnidaemon

2. Set Up Event Bus

# Docker Redis (easiest)
docker run -d -p 6379:6379 --name redis redis:latest

# Or install locally
# macOS: brew install redis && brew services start redis
# Ubuntu: sudo apt install redis-server && sudo systemctl start redis

3. Set Up Environment

# Create .env (optional - uses defaults)
cat > .env << 'EOF'
REDIS_URL=redis://localhost:6379
STORAGE_BACKEND=json
JSON_STORAGE_DIR=.omnidaemon_data
EOF

4. Start an Agent Runner

You need an agent listening on the topic you publish to:

# In another terminal
python agent_runner.py

Simple Publishing (Minimal)

Example 1: Simplest Possible

import asyncio
from omnidaemon import OmniDaemonSDK
from omnidaemon import EventEnvelope, PayloadBase

sdk = OmniDaemonSDK()

async def main():
    # Create event
    event = EventEnvelope(
        topic="greet.user",                    # REQUIRED: Where to send
        payload=PayloadBase(
            content={"name": "Alice"}          # REQUIRED: Your data
        ),
    )

    # Publish
    task_id = await sdk.publish_task(event_envelope=event)
    print(f"✅ Published! Task ID: {task_id}")

asyncio.run(main())

Output:

✅ Published! Task ID: 550e8400-e29b-41d4-a716-446655440000

What Happens:

Event published to omni-stream:greet.user
Any agent subscribed to greet.user receives it
Task ID returned immediately (async processing)

Full Publishing (All Parameters)

Example 2: Using All Features

import asyncio
from omnidaemon import OmniDaemonSDK
from omnidaemon import EventEnvelope, PayloadBase

sdk = OmniDaemonSDK()

async def main():
    event = EventEnvelope(
        # REQUIRED
        topic="file_system.tasks",
        payload=PayloadBase(
            content={
                "action": "create_file",
                "filename": "report.pdf",
                "data": "..."
            },

            # OPTIONAL: Webhook callback
            webhook="https://your-api.com/webhook/results",

            # OPTIONAL: Reply to topic (agent-to-agent)
            reply_to="file_system.response",
        ),

        # OPTIONAL: Tracking IDs
        correlation_id="req-12345",          # Track across requests
        causation_id="evt-67890",            # Track causality chain
        source="api-gateway",                # Where event came from

        # OPTIONAL: Multi-tenancy
        tenant_id="tenant-acme-corp",        # Isolate by customer
    )

    task_id = await sdk.publish_task(event_envelope=event)
    print(f"✅ Task ID: {task_id}")

    # Wait for processing
    await asyncio.sleep(3)

    # Get result (24h TTL)
    result = await sdk.get_result(task_id)
    print(f"✅ Result: {result}")

asyncio.run(main())

Output:

✅ Task ID: 550e8400-e29b-41d4-a716-446655440000
✅ Result: {
    'status': 'success',
    'data': 'File created successfully',
    'processed_by': 'file-processor'
}

Parameter Explanations

Required Parameters

`topic` (Required)

What: The topic (channel) to publish to Format: {domain}.{action} (convention) Example:

topic="file.uploaded"
topic="user.registered"
topic="analysis.requested"

How it works:

Creates/uses stream: omni-stream:{topic}
Delivered to all agents subscribed to this topic

`payload.content` (Required)

What: Your actual data Format: Any JSON-serializable dict Example:

content={
    "user_id": "123",
    "action": "upload",
    "file": "doc.pdf"
}

Optional Parameters

`payload.webhook` (Optional)

What: HTTP URL to POST result to when processing completes When to use: When you want push notifications instead of polling TTL: Results stored for 24 hours Example:

payload=PayloadBase(
    content={...},
    webhook="https://your-api.com/webhook/results"
)

What gets POSTed:

{
    "task_id": "550e8400-...",
    "topic": "file_system.tasks",
    "status": "success",
    "result": {
        "status": "success",
        "data": "..."
    },
    "processed_at": 1678901234.567
}

Use cases:

✅ Real-time notifications
✅ Integration with external systems
✅ Async job completion callbacks
✅ Monitoring/alerting systems

Implementation tip:

# In your webhook endpoint
@app.post("/webhook/results")
async def handle_result(payload: dict):
    task_id = payload["task_id"]
    result = payload["result"]

    # Process result
    logger.info(f"Task {task_id} completed: {result}")

    return {"status": "acknowledged"}

`payload.reply_to` (Optional)

What: Topic to publish result to (agent-to-agent communication) When to use: When building agent pipelines/workflows Example:

payload=PayloadBase(
    content={...},
    reply_to="file_system.response"
)

What happens:

Agent processes event
Result published to reply_to topic
Another agent (listening to that topic) receives it
Creates event chains!

Agent chain example:

# Agent 1: Process file → reply to analysis.tasks
await sdk.register_agent(
    agent_config=AgentConfig(
        topic="file.uploaded",
        callback=process_file,
    )
)

# Inside callback:
async def process_file(message: dict):
    result = {"file_data": "..."}

    # Publish to next agent
    if message.get("reply_to"):
        await sdk.publish_task(
            EventEnvelope(
                topic=message["reply_to"],
                payload=PayloadBase(content=result)
            )
        )

    return result

# Agent 2: Analyze data
await sdk.register_agent(
    agent_config=AgentConfig(
        topic="analysis.tasks",
        callback=analyze_data,
    )
)

Use cases:

✅ Multi-stage pipelines
✅ Agent orchestration
✅ Workflow automation
✅ Fan-out/fan-in patterns

`correlation_id` (Optional)

What: Track a single request across multiple events Format: String (UUID recommended) Lifetime: Passed through entire event chain Example:

# Initial request
event = EventEnvelope(
    topic="user.registered",
    correlation_id="req-12345",  # Same for all related events
    payload=PayloadBase(content={...}),
)

Use cases:

✅ Distributed tracing
✅ Log aggregation
✅ Debug workflows
✅ Track user journeys

Usage in callback:

async def process_event(message: dict):
    correlation_id = message.get("correlation_id")

    logger.info(f"[{correlation_id}] Processing event")

    # Pass to downstream events
    await sdk.publish_task(
        EventEnvelope(
            topic="next.step",
            correlation_id=correlation_id,  # Propagate!
            payload=PayloadBase(content={...}),
        )
    )

`causation_id` (Optional)

What: Track cause-effect relationships in event chains Format: String (usually the ID of the triggering event) Difference from correlation_id: Shows parent-child relationships Example:

# Event 1 (root cause)
event1 = EventEnvelope(
    id="evt-100",
    topic="file.uploaded",
    correlation_id="req-12345",
    payload=PayloadBase(content={...}),
)

# Event 2 (caused by Event 1)
event2 = EventEnvelope(
    id="evt-101",
    topic="virus.scan",
    correlation_id="req-12345",      # Same request
    causation_id="evt-100",           # Caused by evt-100
    payload=PayloadBase(content={...}),
)

# Event 3 (caused by Event 2)
event3 = EventEnvelope(
    id="evt-102",
    topic="notify.user",
    correlation_id="req-12345",      # Same request
    causation_id="evt-101",           # Caused by evt-101
    payload=PayloadBase(content={...}),
)

Use cases:

✅ Event sourcing
✅ Causality tracking
✅ Root cause analysis
✅ Event replay

`source` (Optional)

What: Identifies where the event originated Format: String (system/service name) Example:

event = EventEnvelope(
    topic="user.action",
    source="mobile-app",  # Or: "web-app", "api-gateway", "cron-job"
    payload=PayloadBase(content={...}),
)

Use cases:

✅ Multi-source systems
✅ Source-specific logic
✅ Analytics
✅ Security auditing

Usage in callback:

async def process_event(message: dict):
    source = message.get("source")

    if source == "mobile-app":
        # Mobile-specific logic
        pass
    elif source == "web-app":
        # Web-specific logic
        pass

`tenant_id` (Optional)

What: Isolate data by customer/organization Format: String (customer identifier) Lifetime: Passed through entire event chain Example:

event = EventEnvelope(
    topic="file.upload",
    tenant_id="customer-acme",  # Or: "org-123", "user-456"
    payload=PayloadBase(content={...}),
)

Use cases:

✅ Multi-tenancy
✅ Customer isolation
✅ Per-customer processing
✅ Billing/usage tracking

Usage in callback:

async def process_event(message: dict):
    tenant_id = message.get("tenant_id")

    # Load tenant-specific config
    config = get_tenant_config(tenant_id)

    # Process with tenant context
    result = process_with_config(message["content"], config)

    # Store result with tenant isolation
    await save_result(tenant_id, result)

Result Storage & Retrieval

24-Hour TTL

Results are stored for 24 hours by default:

# Publish event
task_id = await sdk.publish_task(event_envelope=event)

# Result available for 24 hours
result = await sdk.get_result(task_id)  # ✅ Available

# After 24 hours
result = await sdk.get_result(task_id)  # ❌ None (expired)

Why 24 hours?

✅ Balance availability with storage efficiency
✅ Most use cases retrieve results quickly
✅ Prevents unbounded storage growth
✅ Encourages proper result handling

Custom TTL (advanced):

# In storage implementation
await store.save_result(
    task_id=task_id,
    result=result,
    ttl_seconds=3600  # 1 hour
)

Retrieving Results

# Method 1: Poll for result
task_id = await sdk.publish_task(event_envelope=event)

await asyncio.sleep(2)  # Wait for processing

result = await sdk.get_result(task_id)
if result:
    print(f"✅ Result: {result}")
else:
    print("⏳ Not ready yet or expired")

# Method 2: Use webhook (push notification)
event = EventEnvelope(
    topic="file.process",
    payload=PayloadBase(
        content={...},
        webhook="https://your-api.com/webhook"  # Results pushed here
    ),
)

# Method 3: Use reply_to (agent-to-agent)
event = EventEnvelope(
    topic="file.process",
    payload=PayloadBase(
        content={...},
        reply_to="results.topic"  # Result published here
    ),
)

Common Patterns

Pattern 1: Fire-and-Forget

# Publish and don't wait
async def fire_and_forget():
    await sdk.publish_task(
        EventEnvelope(
            topic="analytics.track",
            payload=PayloadBase(content={"event": "page_view"}),
        )
    )
    # Don't retrieve result

Pattern 2: Wait for Result

# Publish and wait
async def wait_for_result():
    task_id = await sdk.publish_task(
        EventEnvelope(
            topic="file.process",
            payload=PayloadBase(content={"file": "doc.pdf"}),
        )
    )

    # Poll until ready
    for i in range(30):  # 30 attempts
        result = await sdk.get_result(task_id)
        if result:
            return result
        await asyncio.sleep(1)

    raise TimeoutError("Result not ready after 30s")

Pattern 3: Batch Publishing

# Publish multiple events
async def batch_publish():
    tasks = []

    for item in items:
        event = EventEnvelope(
            topic="process.item",
            payload=PayloadBase(content=item),
        )
        task_id = await sdk.publish_task(event_envelope=event)
        tasks.append(task_id)

    print(f"✅ Published {len(tasks)} tasks")
    return tasks

Pattern 4: Webhook Callback

# Publish with webhook
async def with_webhook():
    event = EventEnvelope(
        topic="long.task",
        payload=PayloadBase(
            content={"job_id": "123"},
            webhook="https://your-api.com/webhook/completion"
        ),
    )

    task_id = await sdk.publish_task(event_envelope=event)
    print(f"✅ Task {task_id} will POST to webhook when done")

Pattern 5: Agent Pipeline

# Multi-stage pipeline
async def agent_pipeline():
    # Stage 1: Upload
    event1 = EventEnvelope(
        topic="file.upload",
        correlation_id="pipeline-123",
        payload=PayloadBase(
            content={"file": "doc.pdf"},
            reply_to="file.scan"  # Next stage
        ),
    )
    await sdk.publish_task(event_envelope=event1)

    # Stage 2 agent (listening to file.scan) processes
    # Stage 2 replies to file.process
    # Stage 3 agent (listening to file.process) finishes

Pattern 6: Multi-Tenant Publishing

# Per-customer events
async def multi_tenant():
    for customer in customers:
        event = EventEnvelope(
            topic="invoice.generate",
            tenant_id=customer.id,
            correlation_id=f"invoice-{customer.id}",
            payload=PayloadBase(content={
                "customer_id": customer.id,
                "month": "2025-01"
            }),
        )
        await sdk.publish_task(event_envelope=event)

Complete Example

File: publisher.py (based on actual example)

import asyncio
from omnidaemon import OmniDaemonSDK
from omnidaemon import EventEnvelope, PayloadBase

# SDK uses dependency injection for storage
sdk = OmniDaemonSDK()

async def publish_tasks():
    # Complex file operations task
    payload = {
        "content": """
**1. Create a Directory:** Create "test_directory".
**2. Create Files:** Create "file1.txt" and "file2.txt" in "test_directory".
**3. Write Content:** Write sample content into both files.
**4. List Directory:** List contents of "test_directory".
**5. Read File:** Read content of "file1.txt".
**6. Edit File:** Edit "file2.txt" to replace text.
**7. Move File:** Move "file1.txt" to "file3.txt".
""",
        # Optional webhook
        # "webhook": "http://localhost:8004/results",
    }

    topic = "file_system.tasks"

    event_payload = EventEnvelope(
        topic=topic,
        payload=PayloadBase(
            content=payload["content"],
            webhook=payload.get("webhook"),
        ),
    )

    task_id = await sdk.publish_task(event_envelope=event_payload)
    print(f"✅ Published task: {task_id}")

    # Wait for processing
    print("⏳ Waiting for agent to process...")
    await asyncio.sleep(10)

    # Get result
    result = await sdk.get_result(task_id)
    if result:
        print(f"✅ Result:\n{result}")
    else:
        print("❌ Result not found (may have expired or not ready)")

if __name__ == "__main__":
    asyncio.run(publish_tasks())

Run it:

python publisher.py

Output:

✅ Published task: 550e8400-e29b-41d4-a716-446655440000
⏳ Waiting for agent to process...
✅ Result:
{
    'status': 'success',
    'data': 'All file operations completed successfully:\n- Created test_directory\n- Created file1.txt and file2.txt\n- ...',
    'processed_by': 'OmniCore Agent'
}

Best Practices

1. Always Use correlation_id

# Good
event = EventEnvelope(
    topic="process.data",
    correlation_id=f"req-{uuid.uuid4()}",  # Track it!
    payload=PayloadBase(content={...}),
)

# Bad (hard to debug)
event = EventEnvelope(
    topic="process.data",
    payload=PayloadBase(content={...}),
)

2. Structure Your Topics

# Good (hierarchical, clear)
"user.registered"
"user.updated"
"payment.processed"
"email.sent"

# Bad (unclear, unstructured)
"do_stuff"
"handle_user"
"process"

3. Use Webhooks for Long Tasks

# Good for long-running tasks
event = EventEnvelope(
    topic="video.transcode",  # May take minutes
    payload=PayloadBase(
        content={...},
        webhook="https://api.example.com/webhook"  # Push when done
    ),
)

# Polling wastes resources for long tasks

4. Propagate IDs Through Chains

async def process_event(message: dict):
    # Extract IDs
    correlation_id = message.get("correlation_id")
    tenant_id = message.get("tenant_id")

    # Propagate to next event
    await sdk.publish_task(
        EventEnvelope(
            topic="next.step",
            correlation_id=correlation_id,  # Pass through!
            tenant_id=tenant_id,             # Pass through!
            causation_id=message.get("task_id"),  # Chain causality
            payload=PayloadBase(content={...}),
        )
    )

5. Handle Expiration Gracefully

# Always check if result exists
result = await sdk.get_result(task_id)
if result is None:
    # Either not ready, expired, or error
    logger.warning(f"Result {task_id} not found")
    # Implement fallback logic

Troubleshooting

Event Not Processed

# Check if agent is running
omnidaemon agent list

# Check if topic matches
# Publisher: topic="file.upload"
# Agent: topic="file.upload"  # Must match exactly!

Result Not Found

# Common causes:
# 1. Not processed yet (wait longer)
# 2. Expired (> 24 hours)
# 3. Agent returned None
# 4. Agent crashed (check DLQ)

# Check DLQ
omnidaemon bus dlq --topic file.upload

Webhook Not Called

# Ensure webhook URL is reachable from agent
# Use https://webhook.site for testing

event = EventEnvelope(
    topic="test",
    payload=PayloadBase(
        content={...},
        webhook="https://webhook.site/your-unique-url"
    ),
)

Summary

Required Parameters:

topic - Where to send event
payload.content - Your data

Optional Parameters:

payload.webhook - HTTP callback URL
payload.reply_to - Agent-to-agent topic
correlation_id - Track across events
causation_id - Track cause-effect
source - Event origin
tenant_id - Multi-tenancy

Result Storage:

24-hour TTL by default
Retrieve with sdk.get_result(task_id)
Or use webhook for push notifications
Or use reply_to for agent chains

Best Practices:

Always use correlation_id
Structure topics hierarchically
Use webhooks for long tasks
Propagate IDs through chains
Handle expiration gracefully

Publishing events to OmniDaemon is simple yet powerful! 🚀

​Publisher Example

​Overview

​Prerequisites

​1. Install OmniDaemon

​2. Set Up Event Bus

​3. Set Up Environment

​4. Start an Agent Runner

​Simple Publishing (Minimal)

​Example 1: Simplest Possible

​Full Publishing (All Parameters)

​Example 2: Using All Features

​Parameter Explanations

​Required Parameters

​topic (Required)

​payload.content (Required)

​Optional Parameters

​payload.webhook (Optional)

​payload.reply_to (Optional)

​correlation_id (Optional)

​causation_id (Optional)

​source (Optional)

​tenant_id (Optional)

​Result Storage & Retrieval

​24-Hour TTL

​Retrieving Results

​Common Patterns

​Pattern 1: Fire-and-Forget

​Pattern 2: Wait for Result

​Pattern 3: Batch Publishing

​Pattern 4: Webhook Callback

​Pattern 5: Agent Pipeline

​Pattern 6: Multi-Tenant Publishing

​Complete Example

​Best Practices

​1. Always Use correlation_id

​2. Structure Your Topics

​3. Use Webhooks for Long Tasks

​4. Propagate IDs Through Chains

​5. Handle Expiration Gracefully

​Troubleshooting

​Event Not Processed

​Result Not Found

​Webhook Not Called

​Further Reading

​Summary

Publisher Example

Overview

Prerequisites

1. Install OmniDaemon

2. Set Up Event Bus

3. Set Up Environment

4. Start an Agent Runner

Simple Publishing (Minimal)

Example 1: Simplest Possible

Full Publishing (All Parameters)

Example 2: Using All Features

Parameter Explanations

Required Parameters

`topic` (Required)

`payload.content` (Required)

Optional Parameters

`payload.webhook` (Optional)

`payload.reply_to` (Optional)

`correlation_id` (Optional)

`causation_id` (Optional)

`source` (Optional)

`tenant_id` (Optional)

Result Storage & Retrieval

24-Hour TTL

Retrieving Results

Common Patterns

Pattern 1: Fire-and-Forget

Pattern 2: Wait for Result

Pattern 3: Batch Publishing

Pattern 4: Webhook Callback

Pattern 5: Agent Pipeline

Pattern 6: Multi-Tenant Publishing

Complete Example

Best Practices

1. Always Use correlation_id

2. Structure Your Topics

3. Use Webhooks for Long Tasks

4. Propagate IDs Through Chains

5. Handle Expiration Gracefully

Troubleshooting

Event Not Processed

Result Not Found

Webhook Not Called

Further Reading

Summary