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Update changelog and document StatefulToxics

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xthexder committed Sep 1, 2016
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+# 2.1.0 (Unreleased)
+* Add support for stateful toxics
+* Add limit_data toxic
# 2.0.0
* Add CLI (`toxiproxy-cli`) and rename server binary to `toxiproxy-server` #93
@@ -115,6 +115,24 @@ The unit used by `GetBufferSize()` is `StreamChunk`s. Chunks are generally anywh
1 byte, up to 32KB, so keep this in mind when thinking about how much buffering you need,
and how much memory you are comfortable with using.
+## Stateful toxics
+If a toxic needs to store extra information for a connection such as the number of bytes
+transferred (See `limit_data` toxic), a state object can be created by implementing the
+`StatefulToxic` interface. This interface defines the `NewState()` function that can create
+a new state object with default values set.
+When a stateful toxic is created, the state object will be stored on the `ToxicStub` and
+can be accessed from `toxic.Pipe()`:
+state := stub.State.(*ExampleToxicState)
+If necessary, some global state can be stored in the toxic struct, which will not be
+instanced per-connection. These fields cannot have a custom default value set and will
+not be thread-safe, so proper locking or atomic operations will need to be used.
## Using `io.Reader` and `io.Writer`
If your toxic involves modifying the data going through a proxy, you can use the `ChanReader`

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