Run the program

1. install go 1.15 on your computer
2. run go run cmd/main.go

Send HTTP request

• the default port is 8088
• temperature monitor url is /tmp
• quality monitor url is /qlt

Example

send quality monitor request to http://127.0.0.1:8088/qlt
Or you could use go tests in cmd/main_test.go
TestTemperature and TestQuality
these test will fire 1000 requests for 10 devices in parallel.

Story

IoT data collection

sensors are being installed in an oil factory for data collection and processing design a http server that could collect these big volume and high frequency data for the following two purposes:

1. real time anomaly detection
2. report generation

Sensor data format as follows:

Temperature sensor data format: id,time,value;

eg, T1,2020-01-30 19:30:40,27.65;

Oil quality sensor data format: id,time,index1:value1,index2:value2;

eg, Q1,2020-01-30 19:30:40,AB:38.9,AE:221323,CE:0.00001;

index names are abbreviated, including AB(Acid?)，AE(stickiness?), CE(water percentage?)

PS: T stands for temperature sensors, Q stands for quality sensors

Anomaly Detection

1. if one temperature sensor detects a temperature gap above 5 degrees within one day, send out a warning showing temperature being too high/low

2. if one quality sensor detects an index being 10% and above higher than last record twice straight, give a warning

Report Generation

1. Daily average temperature

Example

Input:

T1,2020-01-30 19:00:00,25;

T1,2020-01-30 19:00:01,22;

T1,2020-01-30 19:00:02,28;

Q1,2020-01-30 19:30:10,AB:37.8,AE:100,CE:0.01;

Q1,2020-01-30 19:30:20,AB:39.8,AE:100,CE:0.01;

Q1,2020-01-30 19:30:25,AB:39.9,AE:100,CE:0.01;

Q1,2020-01-30 19:30:32,AB:48.9,AE:101,CE:0.011;

Q1,2020-03-30 19:30:40,AB:58.9,AE:103,CE:0.012;

Output:

warnings:

T1,2020-01-30 19:00:02,28; Temperature too high

Q1,2020-03-30 19:30:40,AB:58.9 AB too high

Report:

Temperature：2020-01-30 25.0

Requirements:

1. fulfill input output requirement
2. good OO design
3. good extensibility
4. support high concurrency