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readme: update diagram

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Jimmy Zelinskie 2016-09-08 00:59:09 -04:00
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@ -31,43 +31,40 @@ Differentiating features include:
### Diagram ### Diagram
``` ```
┌──────────────────────┐ ┌──────────────────────┐
│ BitTorrent Client ├┬──┐ │ BitTorrent Client │◀──────────────┐
└┬─────────────────────┘│◀─┘ └──────────────────────┘ │
└──────────────────────┘ │ │
▲ │ │
┌────────────────┼────────────────────────────────────────────────────┐ │ │
│ ▼ chihaya│ ─────────────▼──────────────────────────┴───────────────────┐─────────────────────────┐
│ ┌──────────────────────┐ │ │┌──────────────────────┐ ┌──────────────────────┐frontend│ chihaya│
│ │ Frontend ├┐ │ ││ Parser │ │ Writer │ │ │
│ └┬─────────────────────┘│ │ │└──────────────────────┘ └──────────────────────┘ │ │
│ └──────────────────────┘ │ │ │ ▲ │ │
│ ▲ │ ─────────────┼──────────────────────────┼───────────────────┘ │
│ │ │ ┌────────────▼──────────────────────────┴───────────────────┐ │
│ ▼ │ │┌──────────────────────┐ ┌──────────────────────┐ logic│ │
│ ┌──────────────────────┐ ┌──────────────────────┐ │ ││ PreHook Middleware │──▶│ Response Generator │◀───────│─────────────┐ │
│ │ PreHook Middleware ├◀───────────│ Storage │ │ │└──────────────────────┘ └──────────────────────┘ │ │ │
│ └┬─────────────────────┘│ └──────────────────────┘ │ │ │ │ │
│ └──────────┬───────────┘ △ │ │┌──────────────────────┐ │ ┌──────────────────────┐│
│ │ │ │ ││ PostHook Middleware │───────────────────────────────────│▷│ Storage ││
│ ▽ │ │ │└──────────────────────┘ │ └──────────────────────┘│
│ ┌──────────────────────┐ │ │ │ │ │
│ │ PostHook Middleware ├┐ │ │ └───────────────────────────────────────────────────────────┘─────────────────────────┘
│ └┬─────────────────────┘│───────────────────────┘ │
│ └──────────────────────┘ │
└─────────────────────────────────────────────────────────────────────┘
``` ```
### Description ### Description
BitTorrent clients send announce and scrape requests to a _Frontend_. BitTorrent clients send Announce and Scrape requests to a _Frontend_.
Frontends parse requests and write responses for the particular protocol they implement. Frontends parse requests and write responses for the particular protocol they implement.
The _TrackerLogic_ interface to is used to generate responses for their requests and optionally perform a task after responding to a client. The _TrackerLogic_ interface to is used to generate responses for their requests and optionally perform a task after responding to a client.
A configurable chain of _PreHook_ and _PostHook_ middleware is used to construct an instance of TrackerLogic. A configurable chain of _PreHook_ and _PostHook_ middleware is used to construct an instance of TrackerLogic.
PreHooks are middleware that are executed before the response has been written. PreHooks are middleware that are executed before the response has been written.
The final middleware in a chain of PreHooks ensures the existance of any required response fields by reading out of the configured implementation of the _Storage_ interface. After all PreHooks have executed, any missing response fields that are required are filled by reading out of the configured implementation of the _Storage_ interface.
PostHooks are asynchronous tasks that occur after a response has been delivered to the client. PostHooks are asynchronous tasks that occur after a response has been delivered to the client.
Request data is written to storage asynchronously in one of these PostHooks. Request data is written to the storage asynchronously in one of these PostHooks.
## Production Use ## Production Use
@ -120,4 +117,3 @@ For more information read [CONTRIBUTING.md].
- [BitTorrent.org](https://github.com/bittorrent/bittorrent.org): a static website containing the BitTorrent spec and all BEPs - [BitTorrent.org](https://github.com/bittorrent/bittorrent.org): a static website containing the BitTorrent spec and all BEPs
- [OpenTracker](http://erdgeist.org/arts/software/opentracker): a popular BitTorrent tracker written in C - [OpenTracker](http://erdgeist.org/arts/software/opentracker): a popular BitTorrent tracker written in C
- [Ocelot](https://github.com/WhatCD/Ocelot): a private BitTorrent tracker written in C++ - [Ocelot](https://github.com/WhatCD/Ocelot): a private BitTorrent tracker written in C++