Smoke Test

The smoke test functionality in Chasm provides a way to verify the basic functionality of the system through a heartbeat mechanism.

Overview

The chasm-heartbeat script safely copies the file abc.pcap to a temporary location, then moves it atomically to the destination directory (/data/io-service/input-undersluice-99-default). This prevents race conditions where a processing job might pick up an incomplete copy.

Prerequisites

Linux environment with Bash shell
Read access to the source file abc.pcap
Write access to the destination directory (/data/io-service/input-undersluice-99-default)
cron service installed and running

Installation

1. Save the script

Create the file /usr/local/bin/chasm-heartbeat with the following content:

#!/bin/bash

# Define file paths
SOURCE_FILE="/path/to/abc.pcap"  # Update this to the actual path
TEMP_FILE="/tmp/heartbeat.pcap"
DEST_DIR="/data/io-service/input-undersluice-99-default"
DEST_FILE="$DEST_DIR/heartbeat.pcap"

# Ensure the destination directory exists
mkdir -p "$DEST_DIR"

# Create a temporary copy
cp "$SOURCE_FILE" "$TEMP_FILE"

# Move the copy to the destination (ensuring atomicity)
mv "$TEMP_FILE" "$DEST_FILE"

# Log the operation (optional)
echo "$(date) - Moved heartbeat.pcap to $DEST_DIR" >> /var/log/chasm-heartbeat.log

2. Make it executable

chmod +x /usr/local/bin/chasm-heartbeat

Configuration

SOURCE_FILE: Path to the original abc.pcap file. Update this variable in the script.
DEST_DIR: Destination directory where heartbeat.pcap will be placed. By default, it is /data/io-service/input-undersluice-99-default.

Cron Job Setup

Open the crontab editor:
```
crontab -e
```
Add the following line to schedule the job every 5 minutes:
```
*/5 * * * * /usr/local/bin/chasm-heartbeat
```
Save and exit. The job will now run every 5 minutes.

Logging

The script appends a timestamped entry to /var/log/chasm-heartbeat.log each time it runs. Adjust the log path or format by editing the final echo command in the script.