101 lines
3.6 KiB
Markdown
101 lines
3.6 KiB
Markdown
# Lox Distributor
|
|
|
|
The Lox distributor receives resources from [rdsys](https://gitlab.torproject.org/tpo/anti-censorship/rdsys) and writes them to [Lox
|
|
BridgeLines](https://git-crysp.uwaterloo.ca/iang/lox/src/master/src/bridge_table.rs#L42). Concurrently, it receives and responds to requests from [Lox clients](https://gitlab.torproject.org/tpo/anti-censorship/lox/lox-wasm). It saves the [LoxContext](https://gitlab.torproject.org/tpo/anti-censorship/lox-rs/-/blob/main/crates/lox-distributor/src/lox_context.rs) to a database every time the Lox bridgetable is updated and before the distributor is shutdown.
|
|
|
|
|
|
## Configuration
|
|
|
|
A test `config.json` is included for testing on a local instance of rdsys. There are several configurable
|
|
fields in this config file:
|
|
|
|
### DB Config
|
|
|
|
The DB config `db` accepts a `db_path` where the Lox distributor will look for or create a new Lox database as follows:
|
|
|
|
```
|
|
"db": {
|
|
"db_path": "path/to/db"
|
|
}
|
|
```
|
|
|
|
### Rdsys Config
|
|
|
|
The rdsys request `rtype` has the following fields:
|
|
|
|
`endpoint` the endpoint of the rdsys instance that the distributor will make requests to,
|
|
|
|
`name` the type of distributor we are requesting. In most cases this should be `lox`,
|
|
|
|
`token` the corresponding Api Token,
|
|
|
|
`types` the type of bridges that are being accepted.
|
|
|
|
Example configuration:
|
|
```
|
|
"rtype": {
|
|
"endpoint": "http://127.0.0.1:7100/resources",
|
|
"name": "lox",
|
|
"token": "LoxApiTokenPlaceholder",
|
|
"types": [
|
|
"obfs2",
|
|
"scramblesuit"
|
|
]
|
|
}
|
|
```
|
|
|
|
### Bridge Config
|
|
|
|
The Bridge config, `bridge_config` has the following fields:
|
|
|
|
`watched_blockages` lists the regions (as ISO 3166 country codes) that Lox will monitor for listed blockages
|
|
|
|
`percent_spares` is the percentage of buckets that should be allocated as hot spares (as opposed to open invitation buckets)
|
|
|
|
Example configuration:
|
|
```
|
|
"bridge_config": {
|
|
"watched_blockages": [
|
|
"RU"
|
|
],
|
|
"percent_spares": 50
|
|
},
|
|
```
|
|
### Metrics Port
|
|
|
|
The `metrics_port` field is the port that the prometheus server will run on.
|
|
|
|
### Command Line Arguments for Advanced Database Config
|
|
|
|
There are a few configurations for the Lox database that can be passed as arguments at run time since they are not likely to be suitable as persistent configuration options.
|
|
|
|
Rolling back to a previous version of the database is possible by passing the
|
|
`roll_back_date` flag at runtime and providing the date/time as a `%Y-%m-%d_%H:%M:%S` string. This argument should be passed if the `LoxContext` should be rolled back to a previous state due to, for example, a mass blocking event that is likely not due to Lox user behaviour. If the exact roll back date/time is not known, the last db entry within 24 hours from the passed `roll_back_date` will be used or else the program will fail gracefully.
|
|
|
|
|
|
## Test Run
|
|
|
|
For testing purposes, you will need a running instance of [rdsys](https://gitlab.torproject.org/tpo/anti-censorship/rdsys) as well as a running Lox client.
|
|
|
|
### Run rdsys locally
|
|
|
|
First clone rdsys from [here](https://gitlab.torproject.org/tpo/anti-censorship/rdsys) then change into the backend directory:
|
|
|
|
```
|
|
cd rdsys/cmd/backend
|
|
```
|
|
|
|
Finally run rdsys:
|
|
|
|
```
|
|
./backend --config config.json
|
|
```
|
|
|
|
### Run Lox Distributor locally
|
|
|
|
Simply run `cargo run -- config.json` :)
|
|
|
|
### Run a Lox client locally
|
|
|
|
First clone lox-wasm from [here](https://gitlab.torproject.org/tpo/anti-censorship/lox/lox-wasm). Follow the instructions in the [README](https://gitlab.torproject.org/tpo/anti-censorship/lox/lox-wasm/-/blob/main/README.md) to build and test the Lox client.
|