code.vegaprotocol.io/vega@v0.79.0/core/integration/helpers/block.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 helpers
    17  
    18  import (
    19  	"math/rand"
    20  	"time"
    21  )
    22  
    23  type Block struct {
    24  	Duration int64
    25  	Variance float64
    26  }
    27  
    28  func NewBlock() *Block {
    29  	return &Block{
    30  		Duration: 1,
    31  	}
    32  }
    33  
    34  func (b Block) GetDuration() time.Duration {
    35  	if b.Variance == 0 {
    36  		return time.Duration(b.Duration) * time.Second
    37  	}
    38  	base := time.Duration(b.Duration) * time.Second
    39  	factor := int64(b.Variance * float64(time.Second))
    40  	// factor of 3, random 0-6 yields random number between -3 and +3
    41  	offset := factor - rand.Int63n(2*factor)
    42  	return base + time.Duration(offset)
    43  }
    44  
    45  func (b Block) GetStep(d time.Duration) time.Duration {
    46  	if b.Variance == 0 {
    47  		return d
    48  	}
    49  	factor := int64(b.Variance * float64(d))
    50  	offset := factor - rand.Int63n(factor*2)
    51  	return d + time.Duration(offset)
    52  }