github.com/uber/kraken@v0.1.4/origin/blobclient/provider.go (about)

     1  // Copyright (c) 2016-2019 Uber Technologies, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  package blobclient
    15  
    16  import (
    17  	"github.com/uber/kraken/lib/hostlist"
    18  )
    19  
    20  // Provider defines an interface for creating Client scoped to an origin addr.
    21  type Provider interface {
    22  	Provide(addr string) Client
    23  }
    24  
    25  // HTTPProvider provides HTTPClients.
    26  type HTTPProvider struct {
    27  	opts []Option
    28  }
    29  
    30  // NewProvider returns a new HTTPProvider.
    31  func NewProvider(opts ...Option) HTTPProvider {
    32  	return HTTPProvider{opts}
    33  }
    34  
    35  // Provide implements ClientProvider's Provide.
    36  // TODO(codyg): Make this return error.
    37  func (p HTTPProvider) Provide(addr string) Client {
    38  	return New(addr, p.opts...)
    39  }
    40  
    41  // ClusterProvider creates ClusterClients from dns records.
    42  type ClusterProvider interface {
    43  	Provide(dns string) (ClusterClient, error)
    44  }
    45  
    46  // HTTPClusterProvider provides ClusterClients backed by HTTP. Does not include
    47  // health checks.
    48  type HTTPClusterProvider struct {
    49  	opts []Option
    50  }
    51  
    52  // NewClusterProvider returns a new HTTPClusterProvider.
    53  func NewClusterProvider(opts ...Option) HTTPClusterProvider {
    54  	return HTTPClusterProvider{opts}
    55  }
    56  
    57  // Provide creates a new ClusterClient.
    58  func (p HTTPClusterProvider) Provide(dns string) (ClusterClient, error) {
    59  	hosts, err := hostlist.New(hostlist.Config{DNS: dns})
    60  	if err != nil {
    61  		return nil, err
    62  	}
    63  	return NewClusterClient(NewClientResolver(NewProvider(p.opts...), hosts)), nil
    64  }