github.com/m3db/m3@v1.5.0/src/query/storage/noop_storage.go (about)

     1  // Copyright (c) 2020 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 storage
    22  
    23  import (
    24  	"context"
    25  	"errors"
    26  	"time"
    27  
    28  	"github.com/m3db/m3/src/query/block"
    29  	"github.com/m3db/m3/src/query/storage/m3/consolidators"
    30  	"github.com/m3db/m3/src/query/storage/m3/storagemetadata"
    31  )
    32  
    33  var errNoopClient = errors.New("operation not valid for noop client")
    34  
    35  // NewNoopStorage returns a fake implementation of Storage that rejects all
    36  // writes and returns errors for all queries.
    37  func NewNoopStorage() Storage {
    38  	return noopStorage{}
    39  }
    40  
    41  type noopStorage struct{}
    42  
    43  func (noopStorage) QueryStorageMetadataAttributes(
    44  	ctx context.Context,
    45  	queryStart, queryEnd time.Time,
    46  	opts *FetchOptions,
    47  ) ([]storagemetadata.Attributes, error) {
    48  	return nil, errNoopClient
    49  }
    50  
    51  func (noopStorage) Fetch(ctx context.Context, query *FetchQuery, options *FetchOptions) (*FetchResult, error) {
    52  	return nil, errNoopClient
    53  }
    54  
    55  func (noopStorage) FetchProm(ctx context.Context, query *FetchQuery, options *FetchOptions) (PromResult, error) {
    56  	return PromResult{}, errNoopClient
    57  }
    58  
    59  // FetchBlocks fetches timeseries as blocks based on a query.
    60  func (noopStorage) FetchBlocks(ctx context.Context, query *FetchQuery, options *FetchOptions) (block.Result, error) {
    61  	return block.Result{}, errNoopClient
    62  }
    63  
    64  func (noopStorage) FetchCompressed(
    65  	ctx context.Context,
    66  	query *FetchQuery,
    67  	options *FetchOptions,
    68  ) (consolidators.MultiFetchResult, error) {
    69  	return nil, errNoopClient
    70  }
    71  
    72  // SearchSeries returns series IDs matching the current query.
    73  func (noopStorage) SearchSeries(ctx context.Context, query *FetchQuery, options *FetchOptions) (*SearchResults, error) {
    74  	return nil, errNoopClient
    75  }
    76  
    77  // CompleteTags returns autocompleted tag results.
    78  func (noopStorage) CompleteTags(ctx context.Context, query *CompleteTagsQuery, options *FetchOptions) (*consolidators.CompleteTagsResult, error) {
    79  	return nil, errNoopClient
    80  }
    81  
    82  // Write writes a batched set of datapoints to storage based on the provided
    83  // query.
    84  func (noopStorage) Write(ctx context.Context, query *WriteQuery) error {
    85  	return errNoopClient
    86  }
    87  
    88  // Type identifies the type of the underlying
    89  func (noopStorage) Type() Type {
    90  	return TypeLocalDC
    91  }
    92  
    93  // Close is used to close the underlying storage and free up resources.
    94  func (noopStorage) Close() error {
    95  	return errNoopClient
    96  }
    97  
    98  // ErrorBehavior dictates what fanout storage should do when this storage
    99  // encounters an error.
   100  func (noopStorage) ErrorBehavior() ErrorBehavior {
   101  	return BehaviorWarn
   102  }
   103  
   104  // Name gives the plaintext name for this storage, used for logging purposes.
   105  func (noopStorage) Name() string {
   106  	return "noopStorage"
   107  }