github.com/m3db/m3@v1.5.0/src/m3ninx/search/query/codec.go (about)

     1  // Copyright (c) 2018 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 query
    22  
    23  import (
    24  	"errors"
    25  	"fmt"
    26  
    27  	"github.com/m3db/m3/src/m3ninx/generated/proto/querypb"
    28  	"github.com/m3db/m3/src/m3ninx/search"
    29  )
    30  
    31  var errNilQuery = errors.New("query is nil")
    32  
    33  // Marshal encodes a query into a byte slice.
    34  func Marshal(q search.Query) ([]byte, error) {
    35  	if q == nil {
    36  		return nil, errNilQuery
    37  	}
    38  	return q.ToProto().Marshal()
    39  }
    40  
    41  // Unmarshal decodes a query from a byte slice.
    42  func Unmarshal(data []byte) (search.Query, error) {
    43  	var pb querypb.Query
    44  	if err := pb.Unmarshal(data); err != nil {
    45  		return nil, err
    46  	}
    47  
    48  	return UnmarshalProto(&pb)
    49  }
    50  
    51  // UnmarshalProto will unmarshal a proto query.
    52  func UnmarshalProto(q *querypb.Query) (search.Query, error) {
    53  	switch q := q.Query.(type) {
    54  
    55  	case *querypb.Query_All:
    56  		return NewAllQuery(), nil
    57  
    58  	case *querypb.Query_Field:
    59  		return NewFieldQuery(q.Field.Field), nil
    60  
    61  	case *querypb.Query_Term:
    62  		return NewTermQuery(q.Term.Field, q.Term.Term), nil
    63  
    64  	case *querypb.Query_Regexp:
    65  		return NewRegexpQuery(q.Regexp.Field, q.Regexp.Regexp)
    66  
    67  	case *querypb.Query_Negation:
    68  		inner, err := UnmarshalProto(q.Negation.Query)
    69  		if err != nil {
    70  			return nil, err
    71  		}
    72  		return NewNegationQuery(inner), nil
    73  
    74  	case *querypb.Query_Conjunction:
    75  		qs := make([]search.Query, 0, len(q.Conjunction.Queries))
    76  		for _, qry := range q.Conjunction.Queries {
    77  			sqry, err := UnmarshalProto(qry)
    78  			if err != nil {
    79  				return nil, err
    80  			}
    81  			qs = append(qs, sqry)
    82  		}
    83  		return NewConjunctionQuery(qs), nil
    84  
    85  	case *querypb.Query_Disjunction:
    86  		qs := make([]search.Query, 0, len(q.Disjunction.Queries))
    87  		for _, qry := range q.Disjunction.Queries {
    88  			sqry, err := UnmarshalProto(qry)
    89  			if err != nil {
    90  				return nil, err
    91  			}
    92  			qs = append(qs, sqry)
    93  		}
    94  		return NewDisjunctionQuery(qs), nil
    95  	}
    96  
    97  	return nil, fmt.Errorf("unknown query: %+v", q)
    98  }