github.com/m3db/m3@v1.5.0/src/dbnode/storage/bootstrap/bootstrapper/peers/peers.go (about)

     1  // Copyright (c) 2016 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  // Package peers implements peers bootstrapping.
    22  package peers
    23  
    24  import (
    25  	"fmt"
    26  
    27  	"github.com/m3db/m3/src/dbnode/storage/bootstrap"
    28  	"github.com/m3db/m3/src/dbnode/storage/bootstrap/bootstrapper"
    29  )
    30  
    31  const (
    32  	// PeersBootstrapperName is the name of the peers bootstrapper
    33  	PeersBootstrapperName = "peers"
    34  )
    35  
    36  type peersBootstrapperProvider struct {
    37  	opts Options
    38  	next bootstrap.BootstrapperProvider
    39  }
    40  
    41  // NewPeersBootstrapperProvider creates a new bootstrapper provider
    42  // to bootstrap from peers.
    43  func NewPeersBootstrapperProvider(
    44  	opts Options,
    45  	next bootstrap.BootstrapperProvider,
    46  ) (bootstrap.BootstrapperProvider, error) {
    47  	if err := opts.Validate(); err != nil {
    48  		return nil, fmt.Errorf("unable to validate peer options: %v", err)
    49  	}
    50  	return peersBootstrapperProvider{
    51  		opts: opts,
    52  		next: next,
    53  	}, nil
    54  }
    55  
    56  func (p peersBootstrapperProvider) Provide() (bootstrap.Bootstrapper, error) {
    57  	src, err := newPeersSource(p.opts)
    58  	if err != nil {
    59  		return nil, err
    60  	}
    61  
    62  	var (
    63  		b    = &peersBootstrapper{}
    64  		next bootstrap.Bootstrapper
    65  	)
    66  	if p.next != nil {
    67  		next, err = p.next.Provide()
    68  		if err != nil {
    69  			return nil, err
    70  		}
    71  	}
    72  	return bootstrapper.NewBaseBootstrapper(b.String(),
    73  		src, p.opts.ResultOptions(), next)
    74  }
    75  
    76  func (p peersBootstrapperProvider) String() string {
    77  	return PeersBootstrapperName
    78  }
    79  
    80  type peersBootstrapper struct {
    81  	bootstrap.Bootstrapper
    82  }
    83  
    84  func (*peersBootstrapper) String() string {
    85  	return PeersBootstrapperName
    86  }