vitess.io/vitess@v0.16.2/go/vt/vtadmin/vtadminproto/tablet.go (about)

     1  /*
     2  Copyright 2020 The Vitess Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package vtadminproto
    18  
    19  import (
    20  	"vitess.io/vitess/go/vt/topo/topoproto"
    21  
    22  	vtadminpb "vitess.io/vitess/go/vt/proto/vtadmin"
    23  )
    24  
    25  // Tablets is a list of Tablet protobuf objects.
    26  type Tablets []*vtadminpb.Tablet
    27  
    28  // AliasStringList returns a list of TabletAlias strings for each tablet in the
    29  // list.
    30  func (tablets Tablets) AliasStringList() []string {
    31  	aliases := make([]string, len(tablets))
    32  
    33  	for i, tablet := range tablets {
    34  		aliases[i] = topoproto.TabletAliasString(tablet.Tablet.Alias)
    35  	}
    36  
    37  	return aliases
    38  }
    39  
    40  // FilterTablets returns a subset of tablets (not exceeding maxResults) that
    41  // satisfy the given condition.
    42  //
    43  // If maxResults is negative, len(tablets) is used instead.
    44  func FilterTablets(condition func(tablet *vtadminpb.Tablet) bool, tablets []*vtadminpb.Tablet, maxResults int) []*vtadminpb.Tablet {
    45  	if maxResults < 0 {
    46  		maxResults = len(tablets)
    47  	}
    48  
    49  	results := make([]*vtadminpb.Tablet, 0, maxResults)
    50  
    51  	for _, tablet := range tablets {
    52  		if len(results) >= maxResults {
    53  			break
    54  		}
    55  
    56  		if condition(tablet) {
    57  			results = append(results, tablet)
    58  		}
    59  	}
    60  
    61  	return results
    62  }
    63  
    64  // ParseTabletServingState returns a ServingState value from the given string.
    65  // If the string does not map to a valid value, this function returns UNKNOWN.
    66  func ParseTabletServingState(state string) vtadminpb.Tablet_ServingState {
    67  	if s, ok := vtadminpb.Tablet_ServingState_value[state]; ok {
    68  		return vtadminpb.Tablet_ServingState(s)
    69  	}
    70  
    71  	return vtadminpb.Tablet_UNKNOWN
    72  }
    73  
    74  // TabletServingStateString returns a ServingState represented as a string. If
    75  // the state does not map to a valid value, this function returns "UNKNOWN".
    76  func TabletServingStateString(state vtadminpb.Tablet_ServingState) string {
    77  	if s, ok := vtadminpb.Tablet_ServingState_name[int32(state)]; ok {
    78  		return s
    79  	}
    80  
    81  	return "UNKNOWN"
    82  }