# Webhook Notifications

ComposeSync can send webhook notifications for various events, including enhanced Git context information.

## Configuration

Set the webhook URL in your configuration:

```toml
[global]
NOTIFICATION_WEBHOOK_URL = "https://your-webhook-url.com/endpoint"
```

Or in `.env` format:

```env
NOTIFICATION_WEBHOOK_URL=https://your-webhook-url.com/endpoint
```

## Webhook Events

ComposeSync sends notifications for the following events:

| Event | Description | When Sent |
|-------|-------------|-----------|
| `update_success` | Stack updated successfully | After successful docker compose up |
| `update_failure` | Update failed, rollback initiated | When docker compose up fails |
| `rollback_success` | Rollback completed successfully | After successful rollback |
| `rollback_failure` | Rollback failed | When rollback also fails |
| `dry_run` | Dry-run mode simulation | When DRY_RUN=true |

## Webhook Payload

Each webhook notification includes:

```json
{
  "event": "update_success",
  "stack_name": "immich",
  "timestamp": "2024-01-15T10:30:00Z",
  "message": "Successfully updated stack immich",
  "version_id": "abc1234",
  "diff": "- old line\n+ new line\n...",
  "git_context": "Commit: abc1234 - Update dependencies (Ref: main) | Repo: immich-app"
}
```

### Payload Fields

| Field | Description | Example |
|-------|-------------|---------|
| `event` | Event type | `update_success` |
| `stack_name` | Name of the stack | `immich` |
| `timestamp` | ISO 8601 timestamp | `2024-01-15T10:30:00Z` |
| `message` | Human-readable message | `Successfully updated stack immich` |
| `version_id` | Version identifier | `abc1234` (Git commit) or `20240115103000` (timestamp) |
| `diff` | Changes applied (truncated to 50 lines) | `- old line\n+ new line` |
| `git_context` | Git information (for Git repositories) | `Commit: abc1234 - Update deps (Ref: main) | Repo: immich-app` |

## Git Context Information

For Git repositories, the `git_context` field provides:

- **Commit hash**: Short commit hash
- **Commit message**: First 100 characters of commit message
- **Reference**: Branch, tag, or commit hash being tracked
- **Repository**: Repository name (sanitized)

Example Git context:
```
Commit: abc1234 - Update dependencies and fix security issues (Ref: main) | Repo: immich-app
```

## Testing Webhooks

You can test webhook notifications using services like:

- [webhook.site](https://webhook.site/) - Temporary webhook endpoints
- [ngrok](https://ngrok.com/) - Expose local endpoints
- [Discord webhooks](https://support.discord.com/hc/en-us/articles/228383668-Intro-to-Webhooks)
- [Slack webhooks](https://api.slack.com/messaging/webhooks)

## Example: Discord Integration

```toml
[global]
NOTIFICATION_WEBHOOK_URL = "https://discord.com/api/webhooks/YOUR_WEBHOOK_URL"
```

## Example: Slack Integration

```toml
[global]
NOTIFICATION_WEBHOOK_URL = "https://hooks.slack.com/services/YOUR_WEBHOOK_URL"
```

## Error Handling

- Webhook failures don't stop the update process
- Failed webhook requests are logged but don't cause errors
- Network timeouts are handled gracefully

## Overview

Webhook notifications provide:
- Real-time updates on stack changes
- Error notifications for failed updates
- Integration with monitoring systems
- Diff output showing what changed
- Support for dry-run mode notifications

## TOML Configuration

### Global Webhook Configuration

Configure webhooks for all stacks in your TOML file:

```toml
# Global settings
[global]
UPDATE_INTERVAL_SECONDS = 3600
KEEP_VERSIONS = 10
DRY_RUN = false
NOTIFICATION_WEBHOOK_URL = "https://your-webhook-url.com/endpoint"

# Stack configurations
[immich]
URL = "https://github.com/immich-app/immich/releases/latest/download/docker-compose.yml"
PATH = "/opt/composesync/stacks/immich"
TOOL = "wget"

[dev-app]
URL = "https://github.com/user/dev-app.git"
PATH = "/opt/composesync/stacks/dev-app"
TOOL = "git"
GIT_SUBPATH = "docker/docker-compose.yml"
GIT_REF = "develop"
```

### Per-Stack Webhook Configuration

Override webhook settings for specific stacks:

```toml
# Global settings
[global]
UPDATE_INTERVAL_SECONDS = 3600
KEEP_VERSIONS = 10
NOTIFICATION_WEBHOOK_URL = "https://default-webhook.com/endpoint"

# Production stack (use global webhook)
[immich]
URL = "https://github.com/immich-app/immich/releases/latest/download/docker-compose.yml"
PATH = "/opt/composesync/stacks/immich"
TOOL = "wget"

# Development stack (different webhook)
[dev-app]
URL = "https://github.com/user/dev-app.git"
PATH = "/opt/composesync/stacks/dev-app"
TOOL = "git"
GIT_SUBPATH = "docker/docker-compose.yml"
GIT_REF = "develop"
NOTIFICATION_WEBHOOK_URL = "https://dev-webhook.com/endpoint"
```

## Legacy .env Configuration

### Global Webhook Configuration

```env
# Global settings
UPDATE_INTERVAL_SECONDS=3600
KEEP_VERSIONS=10
DRY_RUN=false
NOTIFICATION_WEBHOOK_URL=https://your-webhook-url.com/endpoint

# Stack configurations
STACKS=2

STACK_1_NAME=immich
STACK_1_URL=https://github.com/immich-app/immich/releases/latest/download/docker-compose.yml
STACK_1_PATH=/opt/composesync/stacks/immich
STACK_1_TOOL=wget

STACK_2_NAME=dev-app
STACK_2_URL=https://github.com/user/dev-app.git
STACK_2_PATH=/opt/composesync/stacks/dev-app
STACK_2_TOOL=git
STACK_2_GIT_SUBPATH=docker/docker-compose.yml
STACK_2_GIT_REF=develop
```

### Per-Stack Webhook Configuration

```env
# Global settings
UPDATE_INTERVAL_SECONDS=3600
KEEP_VERSIONS=10
NOTIFICATION_WEBHOOK_URL=https://default-webhook.com/endpoint

# Stack configurations
STACKS=2

# Production stack (use global webhook)
STACK_1_NAME=immich
STACK_1_URL=https://github.com/immich-app/immich/releases/latest/download/docker-compose.yml
STACK_1_PATH=/opt/composesync/stacks/immich
STACK_1_TOOL=wget

# Development stack (different webhook)
STACK_2_NAME=dev-app
STACK_2_URL=https://github.com/user/dev-app.git
STACK_2_PATH=/opt/composesync/stacks/dev-app
STACK_2_TOOL=git
STACK_2_GIT_SUBPATH=docker/docker-compose.yml
STACK_2_GIT_REF=develop
STACK_2_NOTIFICATION_WEBHOOK_URL=https://dev-webhook.com/endpoint
```

## Webhook Payload Format

ComposeSync sends JSON payloads with the following structure:

```json
{
  "event": "update_success",
  "stack_name": "immich",
  "timestamp": "2024-01-15T10:30:02Z",
  "message": "Successfully updated stack immich",
  "version_id": "20240115103002",
  "diff": "--- a/docker-compose.yml\n+++ b/docker-compose.yml\n@@ -15,7 +15,7 @@ services:\n   immich-server:\n-    image: ghcr.io/immich-app/immich-server:release\n+    image: ghcr.io/immich-app/immich-server:v1.75.0\n"
}
```

### Event Types

| Event | Description | When Sent |
|-------|-------------|-----------|
| `update_success` | Stack updated successfully | After successful update |
| `update_failure` | Stack update failed | After failed update (with rollback) |
| `dry_run` | Dry-run mode notification | When dry-run mode is enabled |

### Payload Fields

| Field | Type | Description |
|-------|------|-------------|
| `event` | string | Event type (update_success, update_failure, dry_run) |
| `stack_name` | string | Name of the stack being updated |
| `timestamp` | string | ISO 8601 timestamp |
| `message` | string | Human-readable message |
| `version_id` | string | Version identifier (timestamp or git commit) |
| `diff` | string | Unified diff of changes (truncated to 50 lines) |

## Webhook Service Examples

### Discord Webhook

```toml
[global]
NOTIFICATION_WEBHOOK_URL = "https://discord.com/api/webhooks/YOUR_WEBHOOK_ID/YOUR_TOKEN"
```

Discord will display the notification with:
- Stack name as title
- Message as content
- Diff in a code block
- Timestamp

### Slack Webhook

```toml
[global]
NOTIFICATION_WEBHOOK_URL = "https://hooks.slack.com/services/YOUR_WORKSPACE/YOUR_CHANNEL/YOUR_TOKEN"
```

Slack will display:
- Rich message with stack information
- Diff in a collapsible section
- Color coding for success/failure

### Microsoft Teams Webhook

```toml
[global]
NOTIFICATION_WEBHOOK_URL = "https://your-org.webhook.office.com/webhookb2/YOUR_WEBHOOK_ID/IncomingWebhook/YOUR_TOKEN/YOUR_CHANNEL"
```

Teams will show:
- Adaptive card with stack details
- Diff in a code block
- Action buttons for quick access

### Custom Webhook Service

```toml
[global]
NOTIFICATION_WEBHOOK_URL = "https://your-service.com/webhook"
```

Your service can parse the JSON payload to:
- Store update history
- Trigger automated responses
- Send email notifications
- Update monitoring dashboards

## Dry-Run Mode Notifications

When dry-run mode is enabled, webhooks are still sent with a `[DRY-RUN]` prefix:

```json
{
  "event": "update_success",
  "stack_name": "immich",
  "timestamp": "2024-01-15T10:30:02Z",
  "message": "[DRY-RUN] Would apply changes to immich",
  "version_id": "20240115103002",
  "diff": "--- a/docker-compose.yml\n+++ b/docker-compose.yml\n@@ -15,7 +15,7 @@ services:\n   immich-server:\n-    image: ghcr.io/immich-app/immich-server:release\n+    image: ghcr.io/immich-app/immich-server:v1.75.0\n"
}
```

This is useful for:
- Testing webhook configurations
- Previewing changes before applying
- Validating webhook integrations

## Error Notifications

When updates fail, ComposeSync sends error notifications:

```json
{
  "event": "update_failure",
  "stack_name": "immich",
  "timestamp": "2024-01-15T10:30:02Z",
  "message": "Failed to update stack immich, rolled back to previous version",
  "version_id": "20240115103002",
  "diff": "--- a/docker-compose.yml\n+++ b/docker-compose.yml\n@@ -15,7 +15,7 @@ services:\n   immich-server:\n-    image: ghcr.io/immich-app/immich-server:release\n+    image: ghcr.io/immich-app/immich-server:v1.75.0\n"
}
```

## Testing Webhooks

### Manual Testing

Test your webhook endpoint manually:

```bash
# Test basic webhook
curl -X POST -H "Content-Type: application/json" \
  -d '{"event": "test", "message": "Test notification"}' \
  https://your-webhook-url.com/endpoint

# Test with full payload
curl -X POST -H "Content-Type: application/json" \
  -d '{
    "event": "update_success",
    "stack_name": "test-stack",
    "timestamp": "2024-01-15T10:30:02Z",
    "message": "Test update notification",
    "version_id": "test-123",
    "diff": "--- a/test.yml\n+++ b/test.yml\n@@ -1,1 +1,1 @@\n- old\n+ new\n"
  }' \
  https://your-webhook-url.com/endpoint
```

### Enable Dry-Run Mode

Test webhooks safely with dry-run mode:

```toml
[global]
DRY_RUN = true
NOTIFICATION_WEBHOOK_URL = "https://your-webhook-url.com/endpoint"

[test-stack]
URL = "https://github.com/user/test-app.git"
PATH = "/opt/composesync/stacks/test"
TOOL = "git"
GIT_SUBPATH = "docker/docker-compose.yml"
GIT_REF = "main"
```

## Best Practices

### 1. Use Different Webhooks for Different Environments

```toml
# Production webhook
[global]
NOTIFICATION_WEBHOOK_URL = "https://prod-webhook.com/endpoint"

# Development webhook
[dev-app]
URL = "https://github.com/user/dev-app.git"
PATH = "/opt/composesync/stacks/dev-app"
TOOL = "git"
NOTIFICATION_WEBHOOK_URL = "https://dev-webhook.com/endpoint"
```

### 2. Handle Webhook Failures Gracefully

ComposeSync continues to work even if webhook notifications fail:
- Webhook failures don't affect stack updates
- Failed webhooks are logged but don't stop the process
- You can monitor webhook delivery in the logs

### 3. Secure Your Webhooks

- Use HTTPS endpoints only
- Consider webhook authentication if supported
- Rotate webhook tokens regularly
- Monitor webhook access logs

### 4. Monitor Webhook Delivery

```bash
# Check webhook delivery in logs
sudo journalctl -u composesync | grep "webhook"

# Filter for webhook errors
sudo journalctl -u composesync | grep "ERROR.*webhook"
```

## Troubleshooting

### Webhook Not Being Sent

```bash
# Check if webhook URL is configured
grep "NOTIFICATION_WEBHOOK_URL" /opt/composesync/config.toml

# Check service logs for webhook errors
sudo journalctl -u composesync | grep "webhook"
```

### Webhook Delivery Failures

```bash
# Test webhook endpoint manually
curl -X POST -H "Content-Type: application/json" \
  -d '{"test": "message"}' \
  https://your-webhook-url.com/endpoint

# Check network connectivity
wget -q --spider https://your-webhook-url.com/endpoint
echo $?
```

### Webhook Payload Issues

```bash
# Check webhook payload format
sudo journalctl -u composesync | grep "payload"

# Verify JSON syntax
echo '{"test": "payload"}' | jq .
```

### Rate Limiting

If your webhook service has rate limits:
- Consider batching notifications
- Implement retry logic in your webhook service
- Use different webhooks for different stacks