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115 lines
2.8 KiB
Markdown
115 lines
2.8 KiB
Markdown
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# Hacking on I2PD
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This document contains notes compiled from hacking on i2pd
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## prerequisites
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This guide assumes:
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* a decent understanding of c++
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* basic understanding of how i2p works at i2np level and up
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## general structure
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Notes on multithreading
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* every compontent runs in its own thread
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* each component (usually) has a public function `GetService()` which can be used to obtain the `boost::asio::io_service` that it uses.
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* when talking between components/threads, **always** use `GetService().post()` and be mindfull of stack allocated memory.
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### NetDb
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#### NetDb.h
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The `i2p::data::netdb` is a `i2p::data::NetDb` instance processes and dispatches *inbound* i2np messages passed in from transports.
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global singleton at `i2p::data::netdb` as of 2.10.1
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#### NetDbRequests.h
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For Pending RouterInfo/LeaseSet lookup and store requests
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### ClientContext
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#### ClientContext.h
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`i2p::client::ClientContext` spawns all destinations used by the i2p router including the shared local destination.
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global singleton at `i2p::client::context` as of 2.10.1
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### Daemon
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File: Daemon.cpp
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`i2p::util::Daemon_Singleton_Private` subclasses implement the daemon start-up and tear-down, creates Http Webui and i2p control server.
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### Destinations
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#### Destination.h
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each destination runs in its own thread
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##### i2p::client::LeaseSetDestination
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Base for `i2p::client::ClientDestination`
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##### i2p::client::ClientDestination
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Destination capable of creating (tcp/i2p) streams and datagram sessions.
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#### Streaming.h
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##### i2p::stream::StreamingDestination
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Does not implement any destination related members, the name is a bit misleading.
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Owns a `i2p::client::ClientDestination` and runs in the destination thread.
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Anyone creating or using streams outside of the destination thread **MUST** be aware of the consequences of multithreaded c++ :^)
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If you use streaming please consider running all code within the destination thread using `ClientDestination::GetService().post()`
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#### Garlic.h
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Provides Inter-Destination routing primatives.
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##### i2p::garlic::GarlicDestination
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sublcass of `i2p::client::LeaseSetDestination` for sending messages down shared routing paths.
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##### i2p::garlic::GarlicRoutingSession
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a point to point conversation between us and 1 other destination.
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##### i2p::garlic::GarlicRoutingPath
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A routing path currently used by a routing session. specifies which outbound tunnel to use and which remote lease set to use for `OBEP` to `IBGW` inter tunnel communication.
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members:
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* outboundTunnel (OBEP)
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* remoteLease (IBGW)
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* rtt (round trip time)
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* updatedTime (last time this path's IBGW/OBEP was updated)
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* numTimesUsesd (number of times this path was used)
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### Transports
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each transport runs in its own thread
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#### Transports.h
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`i2p::transport::Transports` contains NTCP and SSU transport instances
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