Sensor Log Processor

This Code Was Written as part of the Treex Robotics home assignment. This code reads a robot telemetry log file by streaming and prints a per-sensor report (count, min, max, mean and gap count).

Build

cmake -S . -B build
cmake --build build

Run

./build/sensor_log_processor <log_file> [gap_threshold_ms]

• gap_threshold_ms is optional and defaults to 500ms.

Example:

./build/sensor_log_processor sample_log.txt
./build/sensor_log_processor sample_log.txt 1000

Design choices

• The file is processed one line at a time, so memory use stays constant regardless of log size. (as request)
• Per-sensor stats (min/max/mean/gap count) are kept in a running SensorInfo accumulator per sensor id, updated incrementally rather than storing every reading.
• A Record object is used to parse ea lines in to log file into the relevant details.
• A line is malformed if it doesn't split into exactly 3 whitespace-separated tokens, or if the timestamp/value fields aren't parseable as a number. Malformed lines are counted and skipped rather than stopping the run. (as requested)
• Gap detection compares each reading's timestamp to that sensor's previous timestamp; the first reading for a sensor has no previous timestamp, so it's never counted as a gap (tracked with a -1 sentinel rather than 0, since 0 is a valid timestamp).

What I'd improve with more time

1. Validate each line regarding (range, type, continuous etc..)
   • for example timestamps are in ascending order per sensor
   • list of validate sensors
   • sensor range (non negative values)
2. Handle missing file / unable to open file error
3. Log malformed lines