From 2fbf97da9d1553b3784187e6909bda442753938b Mon Sep 17 00:00:00 2001
From: Ian Norden <iannordenn@gmail.com>
Date: Wed, 19 Feb 2020 13:08:38 -0600
Subject: [PATCH] wasm instantiator

---
 pkg/wasm/instantiator.go | 45 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 pkg/wasm/instantiator.go

diff --git a/pkg/wasm/instantiator.go b/pkg/wasm/instantiator.go
new file mode 100644
index 00000000..f136fa94
--- /dev/null
+++ b/pkg/wasm/instantiator.go
@@ -0,0 +1,45 @@
+// VulcanizeDB
+// Copyright © 2019 Vulcanize
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package wasm
+
+import "github.com/vulcanize/vulcanizedb/pkg/postgres"
+
+type Instantiator struct {
+	db        *postgres.DB
+	instances [][2]string // list of WASM file paths and namespaces
+}
+
+func NewWASMInstantiator(db *postgres.DB, instances [][2]string) *Instantiator {
+	return &Instantiator{
+		db:        db,
+		instances: instances,
+	}
+}
+
+func (i *Instantiator) Instantiate() error {
+	tx, err := i.db.Beginx()
+	if err != nil {
+		return err
+	}
+	for _, pn := range i.instances {
+		_, err := i.db.Exec(`SELECT wasm_new_instance('$1', '$2')`, pn[0], pn[1])
+		if err != nil {
+			return err
+		}
+	}
+	return tx.Commit()
+}