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metadataV9.go
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metadataV9.go
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// Go Substrate RPC Client (GSRPC) provides APIs and types around Polkadot and any Substrate-based chain RPC calls
//
// Copyright 2019 Centrifuge GmbH
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package types
import (
"fmt"
"strings"
"github.com/centrifuge/go-substrate-rpc-client/v4/scale"
)
// Modelled after packages/types/src/Metadata/v9/Metadata.ts
type MetadataV9 struct {
Modules []ModuleMetadataV8
}
func (m *MetadataV9) Decode(decoder scale.Decoder) error {
err := decoder.Decode(&m.Modules)
if err != nil {
return err
}
return nil
}
func (m MetadataV9) Encode(encoder scale.Encoder) error {
err := encoder.Encode(m.Modules)
if err != nil {
return err
}
return nil
}
func (m *MetadataV9) FindCallIndex(call string) (CallIndex, error) {
s := strings.Split(call, ".")
mi := uint8(0)
for _, mod := range m.Modules {
if !mod.HasCalls {
continue
}
if string(mod.Name) != s[0] {
mi++
continue
}
for ci, f := range mod.Calls {
if string(f.Name) == s[1] {
return CallIndex{mi, uint8(ci)}, nil
}
}
return CallIndex{}, fmt.Errorf("method %v not found within module %v for call %v", s[1], mod.Name, call)
}
return CallIndex{}, fmt.Errorf("module %v not found in metadata for call %v", s[0], call)
}
func (m *MetadataV9) FindEventNamesForEventID(eventID EventID) (Text, Text, error) {
mi := uint8(0)
for _, mod := range m.Modules {
if !mod.HasEvents {
continue
}
if mi != eventID[0] {
mi++
continue
}
if int(eventID[1]) >= len(mod.Events) {
return "", "", fmt.Errorf("event index %v for module %v out of range", eventID[1], mod.Name)
}
return mod.Name, mod.Events[eventID[1]].Name, nil
}
return "", "", fmt.Errorf("module index %v out of range", eventID[0])
}
func (m *MetadataV9) FindConstantValue(module Text, constant Text) ([]byte, error) {
for _, mod := range m.Modules {
if mod.Name == module {
for _, cons := range mod.Constants {
if cons.Name == constant {
return cons.Value, nil
}
}
}
}
return nil, fmt.Errorf("could not find constant %s.%s", module, constant)
}
func (m *MetadataV9) FindStorageEntryMetadata(module string, fn string) (StorageEntryMetadata, error) {
for _, mod := range m.Modules {
if !mod.HasStorage {
continue
}
if string(mod.Storage.Prefix) != module {
continue
}
for _, s := range mod.Storage.Items {
if string(s.Name) != fn {
continue
}
return s, nil
}
return nil, fmt.Errorf("storage %v not found within module %v", fn, module)
}
return nil, fmt.Errorf("module %v not found in metadata", module)
}
func (m *MetadataV9) ExistsModuleMetadata(module string) bool {
for _, mod := range m.Modules {
if string(mod.Name) == module {
return true
}
}
return false
}