Extending bindgen (wip dont merge)

[elliots]

I've started work extending bindgen.

What I'm aiming for:

• Use go types instead of seth ones (somewhat done)
• Support structs
• Use text/template instead of strings in go (done)
• Events (somewhat done)

Not near complete, just adding a PR so other people can keep track/help/suggest things :)

Btw, project is excellent Cheers :)

[elliots]

Events are in... needs a bit of a cleanup (and filtering by indexed props) but it is usable.

Generating from

event SomethingHappened(uint16 uint16Val, address addressVal, string stringVal, bytes bytesVal);
    
function sendTestEvent(uint16 uint16Val, string stringVal, bytes bytesVal) public {
    emit SomethingHappened(uint16Val, msg.sender, stringVal, bytesVal);
}

Gives

type SomethingHappenedEvent struct {
	Log        *seth.Log
	Uint16Val  uint16
	AddressVal seth.Address
	StringVal  string
	BytesVal   []byte
}

func (c *Test) FilterSomethingHappenedEvent(start, end int64) (outChan chan *SomethingHappenedEvent, close func(), errChan chan error) {
<SNIP>
}

You can use it like

msgCh, _, errCh := cc.FilterSomethingHappenedEvent(0, -1)

for {
	select {
	case err := <-errCh:
		panic(err)
	case msg := <-msgCh:
		if msg == nil {
			break
		}

		spew.Dump("message", msg)

	}
}

To get

(*main.SomethingHappenedEvent)(0xc0000b84b0)({
 Log: (*seth.Log)(0xc0000ca258)(<SNIP>),
 Uint16Val: (uint16) 321,
 AddressVal: (seth.Address) (len=20 cap=20) 0x84ede7c61cbff3056d6deb24ff774b79c1d2c4e4,
 StringVal: (string) (len=14) "something else",
 BytesVal: ([]uint8) (len=7 cap=7) {
  00000000  67 6f 6f 64 62 79 65                              |goodbye|
 }
})