Add contract files

config.json

@@ -0,0 +1 @@
+{"name":"Oracle example","abi":{"methods":[{"name":"_deploy","offset":0,"parameters":[{"name":"data","type":"Any"},{"name":"isUpdate","type":"Boolean"}],"returntype":"Void","safe":false},{"name":"balance","offset":196,"parameters":[{"name":"playerID","type":"String"}],"returntype":"Integer","safe":false},{"name":"buyItem","offset":218,"parameters":[{"name":"playerID","type":"String"},{"name":"itemID","type":"Integer"}],"returntype":"Void","safe":false},{"name":"cbBuyItem","offset":358,"parameters":[{"name":"url","type":"String"},{"name":"userdata","type":"Any"},{"name":"code","type":"Integer"},{"name":"res","type":"ByteArray"}],"returntype":"Void","safe":false},{"name":"items","offset":207,"parameters":[{"name":"playerID","type":"String"}],"returntype":"Array","safe":false}],"events":[]},"features":{},"groups":[],"permissions":[{"contract":"*","methods":["request"]}],"supportedstandards":[],"trusts":[],"extra":null}

config.yml

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+name: "Oracle example"
+supportedstandards: []
+events:
+permissions:
+  - methods: ["request"]

go.mod

@@ -0,0 +1,5 @@
+module oracle
+
+go 1.21.3
+
+require github.com/nspcc-dev/neo-go/pkg/interop v0.0.0-20231027092558-8ed6d97085d3

go.sum

@@ -0,0 +1,2 @@
+github.com/nspcc-dev/neo-go/pkg/interop v0.0.0-20231027092558-8ed6d97085d3 h1:ybQcK5pTNAR+wQU3k4cGeOZN6OCiVcQkbgR3Zl6NFPU=
+github.com/nspcc-dev/neo-go/pkg/interop v0.0.0-20231027092558-8ed6d97085d3/go.mod h1:J/Mk6+nKeKSW4wygkZQFLQ6SkLOSGX5Ga0RuuuktEag=

main.go

@@ -0,0 +1,95 @@
+package oracleexample
+
+import (
+	"github.com/nspcc-dev/neo-go/pkg/interop/native/oracle"
+	"github.com/nspcc-dev/neo-go/pkg/interop/native/std"
+	"github.com/nspcc-dev/neo-go/pkg/interop/runtime"
+	"github.com/nspcc-dev/neo-go/pkg/interop/storage"
+)
+
+type Player struct {
+	balance int
+	gear    []int
+}
+
+func player(playerID string) Player {
+	ctx := storage.GetContext()
+	data := storage.Get(ctx, playerID)
+	if data == nil {
+		panic("player is not exists")
+	}
+
+	return std.Deserialize(data.([]byte)).(Player)
+}
+
+func _deploy(data interface{}, isUpdate bool) {
+	if isUpdate {
+		return
+	}
+
+	callie := Player{
+		balance: 3000,
+		gear:    []int{},
+	}
+
+	ctx := storage.GetContext()
+	storage.Put(ctx, "Callie", std.Serialize(callie))
+
+	requestURI := "https://git.frostfs.info/alexvanin/oracle-test/raw/branch/master/data.json"
+	storage.Put(ctx, "db", requestURI)
+}
+
+func Balance(playerID string) int {
+	p := player(playerID)
+	return p.balance
+}
+
+func Items(playerID string) []int {
+	p := player(playerID)
+	return p.gear
+}
+
+func BuyItem(playerID string, itemID int) {
+	p := player(playerID)
+	for i := range p.gear {
+		if itemID == p.gear[i] {
+			panic("item already purchased")
+		}
+	}
+
+	ctx := storage.GetContext()
+	uri := storage.Get(ctx, "db").(string)
+
+	filter := []byte("$.store.item[" + std.Itoa10(itemID) + "]")
+
+	oracle.Request(uri, filter, "cbBuyItem", playerID, 2*oracle.MinimumResponseGas)
+}
+
+func CbBuyItem(url string, userdata any, code int, res []byte) {
+	callingHash := runtime.GetCallingScriptHash()
+	if !callingHash.Equals(oracle.Hash) {
+		panic("not called from oracle contract")
+	}
+	if code != oracle.Success {
+		panic("request failed for " + url + " with code " + std.Itoa(code, 10))
+	}
+	runtime.Log("result for " + url + ": " + string(res))
+
+	ln := len(res)
+	data := std.JSONDeserialize(res[1 : ln-1]).(map[string]any)
+
+	playerID := userdata.(string)
+	p := player(playerID)
+
+	price := data["price"].(int)
+
+	if p.balance < price {
+		panic("not enough")
+	}
+
+	p.balance -= price
+	p.gear = append(p.gear, data["id"].(int))
+
+	ctx := storage.GetContext()
+	storage.Put(ctx, playerID, std.Serialize(p))
+}