github.com/gagliardetto/solana-go@v1.11.0/registry.go (about)

     1  // Copyright 2021 github.com/gagliardetto
     2  // This file has been modified by github.com/gagliardetto
     3  //
     4  // Copyright 2020 dfuse Platform Inc.
     5  //
     6  // Licensed under the Apache License, Version 2.0 (the "License");
     7  // you may not use this file except in compliance with the License.
     8  // You may obtain a copy of the License at
     9  //
    10  //      http://www.apache.org/licenses/LICENSE-2.0
    11  //
    12  // Unless required by applicable law or agreed to in writing, software
    13  // distributed under the License is distributed on an "AS IS" BASIS,
    14  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    15  // See the License for the specific language governing permissions and
    16  // limitations under the License.
    17  
    18  package solana
    19  
    20  import (
    21  	"errors"
    22  	"fmt"
    23  	"reflect"
    24  	"sync"
    25  )
    26  
    27  var ErrInstructionDecoderNotFound = errors.New("instruction decoder not found")
    28  
    29  // InstructionDecoder receives the AccountMeta FOR THAT INSTRUCTION,
    30  // and not the accounts of the *Message object. Resolve with
    31  // CompiledInstruction.ResolveInstructionAccounts(message) beforehand.
    32  type InstructionDecoder func(instructionAccounts []*AccountMeta, data []byte) (interface{}, error)
    33  
    34  var instructionDecoderRegistry = newInstructionDecoderRegistry()
    35  
    36  type decoderRegistry struct {
    37  	mu       *sync.RWMutex
    38  	decoders map[PublicKey]InstructionDecoder
    39  }
    40  
    41  func newInstructionDecoderRegistry() *decoderRegistry {
    42  	return &decoderRegistry{
    43  		mu:       &sync.RWMutex{},
    44  		decoders: make(map[PublicKey]InstructionDecoder),
    45  	}
    46  }
    47  
    48  func (reg *decoderRegistry) Has(programID PublicKey) bool {
    49  	reg.mu.RLock()
    50  	defer reg.mu.RUnlock()
    51  
    52  	_, ok := reg.decoders[programID]
    53  	return ok
    54  }
    55  
    56  func (reg *decoderRegistry) Get(programID PublicKey) (InstructionDecoder, bool) {
    57  	reg.mu.RLock()
    58  	defer reg.mu.RUnlock()
    59  
    60  	decoder, ok := reg.decoders[programID]
    61  	return decoder, ok
    62  }
    63  
    64  // RegisterIfNew registers the provided decoder for the provided programID ONLY if there isn't
    65  // already a registered decoder for the programID.
    66  // Returns true if was successfully registered right now (non-previously registered);
    67  // returns false if there already was a decoder registered.
    68  func (reg *decoderRegistry) RegisterIfNew(programID PublicKey, decoder InstructionDecoder) bool {
    69  	reg.mu.Lock()
    70  	defer reg.mu.Unlock()
    71  
    72  	_, ok := reg.decoders[programID]
    73  	if ok {
    74  		return false
    75  	}
    76  	reg.decoders[programID] = decoder
    77  	return true
    78  }
    79  
    80  func RegisterInstructionDecoder(programID PublicKey, decoder InstructionDecoder) {
    81  	prev, has := instructionDecoderRegistry.Get(programID)
    82  	if has {
    83  		// If it's the same function, then OK (tollerate multiple calls with same params).
    84  		if isSameFunction(prev, decoder) {
    85  			return
    86  		}
    87  		// If it's another decoder for the same pubkey, then panic.
    88  		panic(fmt.Sprintf("unable to re-register instruction decoder for program %s", programID))
    89  	}
    90  	instructionDecoderRegistry.RegisterIfNew(programID, decoder)
    91  }
    92  
    93  func isSameFunction(f1 interface{}, f2 interface{}) bool {
    94  	return reflect.ValueOf(f1).Pointer() == reflect.ValueOf(f2).Pointer()
    95  }
    96  
    97  func DecodeInstruction(programID PublicKey, accounts []*AccountMeta, data []byte) (interface{}, error) {
    98  	decoder, found := instructionDecoderRegistry.Get(programID)
    99  	if !found {
   100  		return nil, ErrInstructionDecoderNotFound
   101  	}
   102  	return decoder(accounts, data)
   103  }