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# Go Responsiveness
In late 2021 and early 2022, researchers at Apple took to heart the internet-wide call for giving users more actionable information about the state of their network connections and proposed a new metric, RPM:
> This document specifies the "RPM Test" for measuring responsiveness. It uses common protocols and mechanisms to measure user experience especially when the network is under working conditions. The measurement is expressed as "Round-trips Per Minute" (RPM) and should be included with throughput (up and down) and idle latency as critical indicators of network quality.
Apple wrote and released an implementation of the test in its iOS and macOS operating systems in [versions 15 and Monterey](https://support.apple.com/en-gb/HT212313), respectively.
The researchers at Apple, in collaboration with others throughout the internet-measurement community, proposed RPM as an [IETF RFC](https://github.com/network-quality/draft-ietf-ippm-responsiveness/blob/master/draft-ietf-ippm-responsiveness.txt).
## Independent Implementation
To become a Draft Standard, "at least two independent and interoperable implementation[s]" must exist [RFC2026]. The goal of this implementation of the standard is to satisfy that requirement.
## Operation
### Requirements
1. Go (tested with version 1.16.6)
2. The source code
### Satisfy Requirements
To install Go, follow the excellent documentation [online](https://go.dev/doc/install).
To get the source code,
```
$ git clone https://github.com/network-quality/goresponsiveness.git
```
For the remainder of the instructions, we will assume that `${RSPVNSS_SOURCE_DIR}` is the location of the source code.
### Build
From `${RSPVNSS_SOURCE_DIR}` grab all the required modules:
```
$ go mod download
```
And then build:
```
$ go build networkQuality.go
```
That will create an executable in `${RSPVNSS_SOURCE_DIR}` named `networkQuality`.
### Run
From `${RSPVNSS_SOURCE_DIR}`, running the client is straightforward. Simply
```
$ ./networkQuality
```
Without any options, the tool will attempt to contact `networkquality.example.com` on port 4043 to conduct a measurement. That's likely *not* what you intended. To find out all the options for configuring the execution of the tool, specify the `--help` option:
```
$./networkQuality --help
```
`networkQuality` with the `-help` option will generate the following output:
```
-config string
name/IP of responsiveness configuration server. (default "networkquality.example.com")
-debug
Enable debugging.
-path string
path on the server to the configuration endpoint. (default "config")
-port int
port number on which to access responsiveness configuration server. (default 4043)
-profile string
Enable client runtime profiling and specify storage location. Disabled by default.
-ssl-key-file string
Store the per-session SSL key files in this file.
-timeout int
Maximum time to spend measuring. (default 20)
```
To facilitate testing, you may want to use the open-source RPM server available from [Apple on GitHub](https://github.com/network-quality/server/tree/main/go).
You can also test against the Apple infrastructure using:
```
$ ./networkQuality --config mensura.cdn-apple.com --port 443 --path /api/v1/gm/config
```
## Contributing
We *love* contributions. Before submitting a patch, format your code with `go fmt` *and* `golines`:
```
$ golines -w -m 80 --shorten-comments .
```
You can easily install `golines` in to your `${GOPATH}` with
```
$ go install github.com/segmentio/golines@latest
```
## References
[RFC2026] https://datatracker.ietf.org/doc/html/rfc2026
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