github.com/mysteriumnetwork/node@v0.0.0-20240516044423-365054f76801/core/discovery/repository.go (about)

     1  /*
     2   * Copyright (C) 2020 The "MysteriumNetwork/node" Authors.
     3   *
     4   * This program is free software: you can redistribute it and/or modify
     5   * it under the terms of the GNU General Public License as published by
     6   * the Free Software Foundation, either version 3 of the License, or
     7   * (at your option) any later version.
     8   *
     9   * This program is distributed in the hope that it will be useful,
    10   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    11   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    12   * GNU General Public License for more details.
    13   *
    14   * You should have received a copy of the GNU General Public License
    15   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    16   */
    17  
    18  package discovery
    19  
    20  import (
    21  	"sync"
    22  
    23  	"github.com/rs/zerolog/log"
    24  
    25  	"github.com/mysteriumnetwork/node/core/discovery/proposal"
    26  	"github.com/mysteriumnetwork/node/market"
    27  	"github.com/mysteriumnetwork/node/utils"
    28  )
    29  
    30  // repository provides proposals from multiple other repositories.
    31  type repository struct {
    32  	delegates []proposal.Repository
    33  }
    34  
    35  // NewRepository constructs a new composite repository.
    36  func NewRepository() *repository {
    37  	return &repository{}
    38  }
    39  
    40  // Add adds a delegate repositories from which proposals can be acquired.
    41  func (c *repository) Add(repository proposal.Repository) {
    42  	c.delegates = append(c.delegates, repository)
    43  }
    44  
    45  // Proposal returns a single proposal by its ID.
    46  func (c *repository) Proposal(id market.ProposalID) (*market.ServiceProposal, error) {
    47  	allErrors := utils.ErrorCollection{}
    48  
    49  	for _, delegate := range c.delegates {
    50  		serviceProposal, err := delegate.Proposal(id)
    51  		if err == nil {
    52  			return serviceProposal, nil
    53  		}
    54  		allErrors.Add(err)
    55  	}
    56  
    57  	return nil, allErrors.Error()
    58  }
    59  
    60  // Proposals returns proposals matching the filter.
    61  func (c *repository) Proposals(filter *proposal.Filter) ([]market.ServiceProposal, error) {
    62  	log.Debug().
    63  		Interface("filter", filter).
    64  		Msgf("Retrieving proposals from %d repositories", len(c.delegates))
    65  	proposals := make([][]market.ServiceProposal, len(c.delegates))
    66  	errors := make([]error, len(c.delegates))
    67  
    68  	var wg sync.WaitGroup
    69  	for i, delegate := range c.delegates {
    70  		wg.Add(1)
    71  		go func(idx int, repo proposal.Repository) {
    72  			defer wg.Done()
    73  			proposals[idx], errors[idx] = repo.Proposals(filter)
    74  		}(i, delegate)
    75  	}
    76  	wg.Wait()
    77  
    78  	uniqueProposals := make(map[market.ProposalID]market.ServiceProposal)
    79  	for i, repoProposals := range proposals {
    80  		log.Trace().Msgf("Retrieved %d proposals from repository %d", len(repoProposals), i)
    81  		for _, p := range repoProposals {
    82  			uniqueProposals[p.UniqueID()] = p
    83  		}
    84  	}
    85  
    86  	var result []market.ServiceProposal
    87  	for _, val := range uniqueProposals {
    88  		result = append(result, val)
    89  	}
    90  
    91  	allErrors := utils.ErrorCollection{}
    92  	allErrors.Add(errors...)
    93  
    94  	log.Debug().Err(allErrors.Error()).Msgf("Returning %d unique proposals", len(result))
    95  	return result, allErrors.Error()
    96  }
    97  
    98  // Countries returns proposals per country matching the filter.
    99  func (c *repository) Countries(filter *proposal.Filter) (map[string]int, error) {
   100  	countries := make(map[string]int, 0)
   101  
   102  	for _, repo := range c.delegates {
   103  		repoCountries, err := repo.Countries(filter)
   104  		if err != nil {
   105  			return nil, err
   106  		}
   107  		for k, v := range repoCountries {
   108  			countries[k] += v
   109  		}
   110  	}
   111  
   112  	return countries, nil
   113  }