First pass at reorganizing go code into sub-packages

internal/handlers/prices_lua.go

@@ -0,0 +1,91 @@
+package handlers
+
+import (
+	"github.com/yuin/gopher-lua"
+)
+
+const luaPriceTypeName = "price"
+
+func luaRegisterPrices(L *lua.LState) {
+	mt := L.NewTypeMetatable(luaPriceTypeName)
+	L.SetGlobal("price", mt)
+	L.SetField(mt, "__index", L.NewFunction(luaPrice__index))
+	L.SetField(mt, "__tostring", L.NewFunction(luaPrice__tostring))
+	L.SetField(mt, "__metatable", lua.LString("protected"))
+}
+
+func PriceToLua(L *lua.LState, price *Price) *lua.LUserData {
+	ud := L.NewUserData()
+	ud.Value = price
+	L.SetMetatable(ud, L.GetTypeMetatable(luaPriceTypeName))
+	return ud
+}
+
+// Checks whether the first lua argument is a *LUserData with *Price and returns this *Price.
+func luaCheckPrice(L *lua.LState, n int) *Price {
+	ud := L.CheckUserData(n)
+	if price, ok := ud.Value.(*Price); ok {
+		return price
+	}
+	L.ArgError(n, "price expected")
+	return nil
+}
+
+func luaPrice__index(L *lua.LState) int {
+	p := luaCheckPrice(L, 1)
+	field := L.CheckString(2)
+
+	switch field {
+	case "PriceId", "priceid":
+		L.Push(lua.LNumber(float64(p.PriceId)))
+	case "Security", "security":
+		security_map, err := luaContextGetSecurities(L)
+		if err != nil {
+			panic("luaContextGetSecurities couldn't fetch securities")
+		}
+		s, ok := security_map[p.SecurityId]
+		if !ok {
+			panic("Price's security not found for user")
+		}
+		L.Push(SecurityToLua(L, s))
+	case "Currency", "currency":
+		security_map, err := luaContextGetSecurities(L)
+		if err != nil {
+			panic("luaContextGetSecurities couldn't fetch securities")
+		}
+		c, ok := security_map[p.CurrencyId]
+		if !ok {
+			panic("Price's currency not found for user")
+		}
+		L.Push(SecurityToLua(L, c))
+	case "Value", "value":
+		amt, err := GetBigAmount(p.Value)
+		if err != nil {
+			panic(err)
+		}
+		float, _ := amt.Float64()
+		L.Push(lua.LNumber(float))
+	default:
+		L.ArgError(2, "unexpected price attribute: "+field)
+	}
+
+	return 1
+}
+
+func luaPrice__tostring(L *lua.LState) int {
+	p := luaCheckPrice(L, 1)
+
+	security_map, err := luaContextGetSecurities(L)
+	if err != nil {
+		panic("luaContextGetSecurities couldn't fetch securities")
+	}
+	s, ok1 := security_map[p.SecurityId]
+	c, ok2 := security_map[p.CurrencyId]
+	if !ok1 || !ok2 {
+		panic("Price's currency or security not found for user")
+	}
+
+	L.Push(lua.LString(p.Value + " " + c.Symbol + " (" + s.Symbol + ")"))
+
+	return 1
+}