neo-go/internal/contracts/oracle_contract/oracle.go

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package oraclecontract
import (
"github.com/nspcc-dev/neo-go/pkg/interop"
"github.com/nspcc-dev/neo-go/pkg/interop/contract"
"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"
"github.com/nspcc-dev/neo-go/pkg/interop/util"
)
// RequestURL accepts a complete set of parameters to make an oracle request and
// performs it.
func RequestURL(url string, filter []byte, callback string, userData any, gasForResponse int) {
oracle.Request(url, filter, callback, userData, gasForResponse)
}
// Handle is a response handler that writes response data to the storage.
func Handle(url string, data any, code int, res []byte) {
// ABORT if len(data) == 2, some tests use this feature.
if data != nil && len(data.(string)) == 2 {
util.Abort()
}
params := []any{url, data, code, res}
storage.Put(storage.GetContext(), "lastOracleResponse", std.Serialize(params))
}
// HandleRecursive invokes oracle.finish again to test Oracle reentrance.
func HandleRecursive(url string, data any, code int, res []byte) {
// Regular safety check.
callingHash := runtime.GetCallingScriptHash()
if !callingHash.Equals(oracle.Hash) {
panic("not called from oracle contract")
}
runtime.Notify("Invocation")
if runtime.GetInvocationCounter() == 1 {
// We provide no wrapper for finish in interops, it's not usually needed.
contract.Call(interop.Hash160(oracle.Hash), "finish", contract.All)
}
}