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----
Functions:
[[toc levels=1]]
## Read/Write/Error Callback:
* Input: `(bufferevent, what)`
* `bufferevent` - Reference to the bufferevent that raised the callback
* `what` - What happened:
* == `EVBUFFER_READ` - Buffer contains at least low-watermark length and no more than high-watermark length
* == `EVBUFFER_WRITE` - Buffer ready to write to
* (other) - Error condition
* May be or-ed/added with `EVBUFFER_READ`/`EVBUFFER_WRITE` to specify where it happened
* `EVBUFFER_ERROR` - Marks error condition (need to look at 'errno' for error.. not exposed yet)
* `EVBUFFER_TIMEOUT` - Marks activity timeout
* `EVBUFFER_EOF` - Marks disconnection/end-of-file condition
## bufferevent.new
* Input: `(fd, read, write, error)`
* `fd` - File descriptor to watch
* `read` - (may be nil) - callback to call when data in buffer is above the low watermark
* `write` - (may be nil) - callback to call when the output buffer contains less data than the low watermark
* `error` - callback to call when there is an erroneous condition
## bufferevent (__gc)
* Releases the bufferevent
* Disconnects event buffers since they were owned by the bufferevent object in 'C' land
* Disconnects all references so that any erroneous callbacks don't cause failures
## bufferevent:get_read
* Obtains the input buffer associated w/ the bufferevent
## bufferevent:get_write
* Obtains the output buffer associated w/ the bufferevent
## bufferevent:set_read_watermarks
* Input: `(low, high)`
* `low` - Size of buffer at which an event would be fired
* `high` - Maximum size of buffer to read to
## bufferevent:set_write_watermarks
* Input: `(low, high)`
* `low` - When buffer is below this, the event will be fired
* `high` - N/A to libevent, user app may use this
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