104 lines
3.2 KiB
Go
104 lines
3.2 KiB
Go
// Copyright 2021 github.com/gagliardetto
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// This file has been modified by github.com/gagliardetto
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//
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// Copyright 2020 dfuse Platform Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package solana
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import (
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"errors"
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"fmt"
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"reflect"
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"sync"
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)
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var ErrInstructionDecoderNotFound = errors.New("instruction decoder not found")
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// InstructionDecoder receives the AccountMeta FOR THAT INSTRUCTION,
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// and not the accounts of the *Message object. Resolve with
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// CompiledInstruction.ResolveInstructionAccounts(message) beforehand.
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type InstructionDecoder func(instructionAccounts []*AccountMeta, data []byte) (interface{}, error)
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var instructionDecoderRegistry = newInstructionDecoderRegistry()
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type decoderRegistry struct {
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mu *sync.RWMutex
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decoders map[PublicKey]InstructionDecoder
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}
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func newInstructionDecoderRegistry() *decoderRegistry {
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return &decoderRegistry{
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mu: &sync.RWMutex{},
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decoders: make(map[PublicKey]InstructionDecoder),
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}
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}
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func (reg *decoderRegistry) Has(programID PublicKey) bool {
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reg.mu.RLock()
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defer reg.mu.RUnlock()
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_, ok := reg.decoders[programID]
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return ok
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}
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func (reg *decoderRegistry) Get(programID PublicKey) (InstructionDecoder, bool) {
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reg.mu.RLock()
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defer reg.mu.RUnlock()
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decoder, ok := reg.decoders[programID]
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return decoder, ok
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}
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// RegisterIfNew registers the provided decoder for the provided programID ONLY if there isn't
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// already a registered decoder for the programID.
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// Returns true if was successfully registered right now (non-previously registered);
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// returns false if there already was a decoder registered.
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func (reg *decoderRegistry) RegisterIfNew(programID PublicKey, decoder InstructionDecoder) bool {
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reg.mu.Lock()
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defer reg.mu.Unlock()
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_, ok := reg.decoders[programID]
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if ok {
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return false
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}
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reg.decoders[programID] = decoder
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return true
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}
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func RegisterInstructionDecoder(programID PublicKey, decoder InstructionDecoder) {
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prev, has := instructionDecoderRegistry.Get(programID)
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if has {
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// If it's the same function, then OK (tollerate multiple calls with same params).
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if isSameFunction(prev, decoder) {
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return
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}
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// If it's another decoder for the same pubkey, then panic.
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panic(fmt.Sprintf("unable to re-register instruction decoder for program %s", programID))
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}
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instructionDecoderRegistry.RegisterIfNew(programID, decoder)
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}
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func isSameFunction(f1 interface{}, f2 interface{}) bool {
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return reflect.ValueOf(f1).Pointer() == reflect.ValueOf(f2).Pointer()
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}
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func DecodeInstruction(programID PublicKey, accounts []*AccountMeta, data []byte) (interface{}, error) {
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decoder, found := instructionDecoderRegistry.Get(programID)
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if !found {
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return nil, ErrInstructionDecoderNotFound
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}
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return decoder(accounts, data)
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}
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