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

     1  /*
     2   * Copyright (C) 2019 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 location
    19  
    20  import (
    21  	"github.com/pkg/errors"
    22  	"github.com/rs/zerolog/log"
    23  
    24  	"github.com/mysteriumnetwork/node/core/location/locationstate"
    25  )
    26  
    27  // ErrLocationResolutionFailed represents a failure to resolve location and running out of fallbacks to try
    28  var ErrLocationResolutionFailed = errors.New("location resolution failed")
    29  
    30  // FallbackResolver represents a resolver that tries multiple resolution techniques in sequence until one of them completes successfully, or all of them fail.
    31  type FallbackResolver struct {
    32  	LocationResolvers []Resolver
    33  }
    34  
    35  // NewFallbackResolver returns a new instance of fallback resolver
    36  func NewFallbackResolver(resolvers []Resolver) *FallbackResolver {
    37  	return &FallbackResolver{
    38  		LocationResolvers: resolvers,
    39  	}
    40  }
    41  
    42  // DetectLocation allows us to detect our current location
    43  func (fr *FallbackResolver) DetectLocation() (locationstate.Location, error) {
    44  	log.Debug().Msg("Detecting with fallback resolver")
    45  	for _, v := range fr.LocationResolvers {
    46  		loc, err := v.DetectLocation()
    47  		if err != nil {
    48  			log.Warn().Err(err).Msg("Could not resolve location")
    49  		} else {
    50  			return loc, err
    51  		}
    52  	}
    53  	return locationstate.Location{}, ErrLocationResolutionFailed
    54  }
    55  
    56  // DetectProxyLocation allows us to detect our current location via a proxy.
    57  func (fr *FallbackResolver) DetectProxyLocation(proxyPort int) (locationstate.Location, error) {
    58  	log.Debug().Msg("Detecting with fallback resolver")
    59  	for _, v := range fr.LocationResolvers {
    60  		loc, err := v.DetectProxyLocation(proxyPort)
    61  		if err != nil {
    62  			log.Warn().Err(err).Msg("Could not resolve location")
    63  		} else {
    64  			return loc, err
    65  		}
    66  	}
    67  	return locationstate.Location{}, ErrLocationResolutionFailed
    68  }