sampler-fork/README.md

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# Sampler. Visualization for any shell command.
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Sampler is a tool for shell commands execution, visualization and alerting. Configured with a simple YAML file.
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![sampler](https://user-images.githubusercontent.com/6069066/56404396-70b14d00-6234-11e9-93cd-54461bf40c96.gif)
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## Installation
### macOS
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### Linux
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### Windows
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## Usage
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You specify shell commands, Sampler executes them with a required rate. The output is used for visualization.
One can sample any dynamic process right from the terminal - observe changes in the database, monitor MQ in-flight messages, trigger deployment process and get notification when it's done.
Using Sampler is basically a 3-step process:
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- Define your configuration in a YAML file
- Run `sampler -c config.yml`
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- Adjust components size and location on UI
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## Configuration
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- [Components](#components)
- [Runchart](#runchart)
- [Sparkline](#sparkline)
- [Barchart](#barchart)
- [Gauge](#gauge)
- [Textbox](#textbox)
- [Asciibox](#asciibox)
- [Bells and whistles](#bells-and-whistles)
- [Triggers (conditional actions)](#triggers)
- [Interactive shell (for database interaction, remote server access, etc)](#interactive-shell-support)
- [Variables](#variables)
- [Color theme](#color-theme)
- [Real-world examples (contributions welcome)](#real-world-examples)
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### Components
#### Runchart
```yml
runcharts:
- title: Search engine response time
rate-ms: 500 # sampling rate, default = 1000
scale: 2 # number of digits after sample decimal point, default = 1
legend:
enabled: true # enables item labels, default = true
details: false # enables item statistics: cur/min/max/dlt values, default = true
items:
- label: GOOGLE
sample: curl -o /dev/null -s -w '%{time_total}' https://www.google.com
color: 178 # 8-bit color number, default one is chosen from a pre-defined palette
- label: YAHOO
sample: curl -o /dev/null -s -w '%{time_total}' https://search.yahoo.com
- label: BING
sample: curl -o /dev/null -s -w '%{time_total}' https://www.bing.com
```
#### Sparkline
```yml
sparklines:
- title: CPU usage
rate-ms: 200 # sampling rate, default = 1000
scale: 0 # number of digits after sample decimal point, default = 1
sample: ps -A -o %cpu | awk '{s+=$1} END {print s}'
```
#### Barchart
```yml
barcharts:
- title: Local network activity
rate-ms: 500 # sampling rate, default = 1000
scale: 0 # number of digits after sample decimal point, default = 1
items:
- label: UDP bytes in
sample: nettop -J bytes_in -l 1 -m udp | awk '{sum += $4} END {print sum}'
- label: UDP bytes out
sample: nettop -J bytes_out -l 1 -m udp | awk '{sum += $4} END {print sum}'
- label: TCP bytes in
sample: nettop -J bytes_in -l 1 -m tcp | awk '{sum += $4} END {print sum}'
- label: TCP bytes out
sample: nettop -J bytes_out -l 1 -m tcp | awk '{sum += $4} END {print sum}'
```
#### Gauge
```yml
gauges:
- title: Minute progress
rate-ms: 500 # sampling rate, default = 1000
scale: 2 # number of digits after sample decimal point, default = 1
color: 39 # 8-bit color number, default one is chosen from a pre-defined palette
cur:
sample: date +%S # sample script for current value
max:
sample: echo 60 # sample script for max value
min:
sample: echo 0 # sample script for min value
```
#### Textbox
```yml
textboxes:
- title: Local weather
rate-ms: 10000 # sampling rate, default = 1000
sample: curl wttr.in?0ATQF
border: false # border around the item, default = true
color: 178 # 8-bit color number, default is white
- title: Docker containers stats
rate-ms: 500
sample: docker stats --no-stream --format "table {{.Name}}\t{{.CPUPerc}}\t{{.MemUsage}}\t{{.PIDs}}"
```
#### Asciibox
```yml
asciiboxes:
- title: UTC time
rate-ms: 500 # sampling rate, default = 1000
font: 3d # font type, default = 2d
color: 178 # 8-bit color number, default is white
sample: env TZ=UTC date +%r
```
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### Bells and whistles
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#### Triggers
Triggers allow to perform conditional actions, like visual/sound alerts or an arbitrary shell command.
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#### Interactive shell support
In addition to the `sample` command, one can specify `init` command (executed only once before sampling) and `transform` command (to post-process `sample` command output). That covers interactive shell use case, e.g. to establish connection to a database only once, and then perform polling within interactive shell session. MongoDB example: ...
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#### Variables
If the configuration file contains repeated patterns, they can be extracted into the `variables` section.
Also variables can be specified using `-v`/`--variable` flag on startup, and any system environment variables will also be available in the scripts.
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#### Color theme
...
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### Real-world examples
...