feat: Go wasm - PST contract with tinygo

Author: ppedziwiatr

.gitignore

@@ -116,4 +116,4 @@ pkg
 build
 
 # go build folder
-out
+out/*.wasm

go/README.md

@@ -1,18 +1,21 @@
 # Go smartweave example contract
 
 Note: we're using `tinygo` compiler, as the default compiler produces huuuuge binaries 
-(hello world example - ~2MB - probably because it adds all the WASI related stuff)
+(`hello world` example - ~2MB)
 ![img.png](img.png)
 
-## How to use
-- [Install tinygo](https://tinygo.org/getting-started/install/)
-- Build wasm contract file: `bash build.sh` (it should create `pkg` folder)
-- Run wasm contract simulation: `node wasm_exec_tiny.js out/main.wasm`
-
-note: 
-use wasm_exec.js from tinygo, not the defaut one from Go - https://github.com/tinygo-org/tinygo/issues/2484
+## How to use (default Go compiler)
+- [Install easyjson](https://github.com/mailru/easyjson#install)
+- Run `easyjson -all easyjson/easyjson.go`
+- Build wasm contract file: `bash build.sh` (it should create `out` folder)
+- Run wasm contract simulation: `node run.js`
 
-note 2:
-no support for decoding json in tinygo - https://github.com/tinygo-org/tinygo/issues/2660
+## How to use (tinygo compiler)
+- [Install tinygo](https://tinygo.org/getting-started/install/)
+- [Install easyjson](https://github.com/mailru/easyjson#install)
+- Run `easyjson -all easyjson/easyjson.go`
+- Build wasm contract file: `bash build-tiny.sh` (it should create `out` folder)
+- Run wasm contract simulation: `node run-tiny.js`
 
-async features - https://stackoverflow.com/a/68427221/18299469
+Size comparison for PST contract:  
+![img_1.png](img_1.png)

go/build-tiny.sh

@@ -0,0 +1 @@
+tinygo build -o out/contract_tiny.wasm -no-debug -target wasm main.go

go/common/async.go

@@ -1,9 +1,6 @@
 package common
 
 import (
-	"bytes"
-	"encoding/gob"
-	"encoding/json"
 	"syscall/js"
 )
 
@@ -34,15 +31,12 @@ func Await(awaitable js.Value) ([]js.Value, []js.Value) {
 	}
 }
 
-func ConvertInto(action map[string]interface{}, into interface {}) {
-	jsonStr, _ := json.Marshal(action)
-	json.Unmarshal(jsonStr, into)
-}
-
-func DeepCopy(src, dist interface{}) (err error){
-	buf := bytes.Buffer{}
+func DeepCopy(src, dest interface{}) (err error) {
+	dest = &src
+	return nil
+	/*buf := bytes.Buffer{}
 	if err = gob.NewEncoder(&buf).Encode(src); err != nil {
 		return
 	}
-	return gob.NewDecoder(&buf).Decode(dist)
+	return gob.NewDecoder(&buf).Decode(dest)*/
 }

go/easyjson/easyjson.go

@@ -1,10 +1,41 @@
 package easyjson
 
-//easyjson:json
-type PstStateEs struct {
-	Ticker    string `json:"ticker"`
-	Name      string `json:"name"`
-	Owner     string `json:"owner"`
-	Evolve    string `json:"evolve"`
-	CanEvolve bool   `json:"canEvolve"`
+type PstState struct {
+	Ticker    string            `json:"ticker"`
+	Name      string            `json:"name"`
+	Owner     string            `json:"owner"`
+	Evolve    string            `json:"evolve"`
+	CanEvolve bool              `json:"canEvolve"`
+	Balances  map[string]uint64 `json:"balances"`
 }
+
+type Action struct {
+	Function string `json:"function"`
+}
+
+type TransferAction struct {
+	Function string `json:"function"`
+	Target   string `json:"target"`
+	Qty      uint64 `json:"qty"`
+}
+
+type EvolveAction struct {
+	Action
+	Value string `json:"target"`
+}
+
+type BalanceAction struct {
+	Action
+	Target string `json:"target"`
+}
+
+type ForeignCallAction struct {
+	Action
+	ContractTxId string `json:"contractTxId"`
+}
+
+type BalanceResult struct {
+	Balance uint64 `json:"balance"`
+}
+
+type ActionResult = interface{}