github.com/uber/kraken@v0.1.4/tracker/metainfoclient/testing.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 metainfoclient
    15  
    16  import (
    17  	"errors"
    18  	"sync"
    19  
    20  	"github.com/uber/kraken/core"
    21  )
    22  
    23  // TestClient is a thread-safe, in-memory client for simulating downloads.
    24  type TestClient struct {
    25  	sync.Mutex
    26  	m map[core.Digest]*core.MetaInfo
    27  }
    28  
    29  // NewTestClient returns a new TestClient.
    30  func NewTestClient() *TestClient {
    31  	return &TestClient{m: make(map[core.Digest]*core.MetaInfo)}
    32  }
    33  
    34  // Upload "uploads" metainfo that can then be subsequently downloaded. Upload
    35  // is not supported in the Client interface and exists soley for testing purposes.
    36  func (c *TestClient) Upload(mi *core.MetaInfo) error {
    37  	c.Lock()
    38  	defer c.Unlock()
    39  	if _, ok := c.m[mi.Digest()]; ok {
    40  		return errors.New("metainfo already exists")
    41  	}
    42  	c.m[mi.Digest()] = mi
    43  	return nil
    44  }
    45  
    46  // Download returns the metainfo for digest. Ignores namespace.
    47  func (c *TestClient) Download(namespace string, d core.Digest) (*core.MetaInfo, error) {
    48  	c.Lock()
    49  	defer c.Unlock()
    50  	mi, ok := c.m[d]
    51  	if !ok {
    52  		return nil, ErrNotFound
    53  	}
    54  	return mi, nil
    55  }