code.vegaprotocol.io/vega@v0.79.0/core/idgeneration/generator.go (about)

     1  // Copyright (C) 2023 Gobalsky Labs Limited
     2  //
     3  // This program is free software: you can redistribute it and/or modify
     4  // it under the terms of the GNU Affero General Public License as
     5  // published by the Free Software Foundation, either version 3 of the
     6  // License, or (at your option) any later version.
     7  //
     8  // This program is distributed in the hope that it will be useful,
     9  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    10  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    11  // GNU Affero General Public License for more details.
    12  //
    13  // You should have received a copy of the GNU Affero General Public License
    14  // along with this program.  If not, see <http://www.gnu.org/licenses/>.
    15  
    16  package idgeneration
    17  
    18  import (
    19  	"encoding/hex"
    20  
    21  	"code.vegaprotocol.io/vega/libs/crypto"
    22  )
    23  
    24  // IDGenerator no mutex required, markets work deterministically, and sequentially.
    25  type IDGenerator struct {
    26  	nextIDBytes []byte
    27  }
    28  
    29  // New returns an idGenerator, and is used to abstract this type.
    30  func New(rootID string) *IDGenerator { //revive:disable:unexported-return
    31  	nextIDBytes, err := hex.DecodeString(rootID)
    32  	if err != nil {
    33  		panic("failed to create new deterministic id generator: " + err.Error())
    34  	}
    35  
    36  	return &IDGenerator{
    37  		nextIDBytes: nextIDBytes,
    38  	}
    39  }
    40  
    41  func (i *IDGenerator) NextID() string {
    42  	if i == nil {
    43  		panic("id generator instance is not initialised")
    44  	}
    45  
    46  	nextID := hex.EncodeToString(i.nextIDBytes)
    47  	i.nextIDBytes = crypto.Hash(i.nextIDBytes)
    48  	return nextID
    49  }