config_test.go

Documentation: google.golang.org/grpc/xds/internal/balancer/ringhash

     1  /*
     2   *
     3   * Copyright 2021 gRPC authors.
     4   *
     5   * Licensed under the Apache License, Version 2.0 (the "License");
     6   * you may not use this file except in compliance with the License.
     7   * You may obtain a copy of the License at
     8   *
     9   *     http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   *
    17   */
    18  
    19  package ringhash
    20  
    21  import (
    22  	"testing"
    23  
    24  	"github.com/google/go-cmp/cmp"
    25  	"google.golang.org/grpc/internal/envconfig"
    26  )
    27  
    28  func (s) TestParseConfig(t *testing.T) {
    29  	tests := []struct {
    30  		name         string
    31  		js           string
    32  		envConfigCap uint64
    33  		want         *LBConfig
    34  		wantErr      bool
    35  	}{
    36  		{
    37  			name: "OK",
    38  			js:   `{"minRingSize": 1, "maxRingSize": 2}`,
    39  			want: &LBConfig{MinRingSize: 1, MaxRingSize: 2},
    40  		},
    41  		{
    42  			name: "OK with default min",
    43  			js:   `{"maxRingSize": 2000}`,
    44  			want: &LBConfig{MinRingSize: defaultMinSize, MaxRingSize: 2000},
    45  		},
    46  		{
    47  			name: "OK with default max",
    48  			js:   `{"minRingSize": 2000}`,
    49  			want: &LBConfig{MinRingSize: 2000, MaxRingSize: defaultMaxSize},
    50  		},
    51  		{
    52  			name:    "min greater than max",
    53  			js:      `{"minRingSize": 10, "maxRingSize": 2}`,
    54  			want:    nil,
    55  			wantErr: true,
    56  		},
    57  		{
    58  			name:    "min greater than max greater than global limit",
    59  			js:      `{"minRingSize": 6000, "maxRingSize": 5000}`,
    60  			want:    nil,
    61  			wantErr: true,
    62  		},
    63  		{
    64  			name: "max greater than global limit",
    65  			js:   `{"minRingSize": 1, "maxRingSize": 6000}`,
    66  			want: &LBConfig{MinRingSize: 1, MaxRingSize: 4096},
    67  		},
    68  		{
    69  			name: "min and max greater than global limit",
    70  			js:   `{"minRingSize": 5000, "maxRingSize": 6000}`,
    71  			want: &LBConfig{MinRingSize: 4096, MaxRingSize: 4096},
    72  		},
    73  		{
    74  			name:         "min and max less than raised global limit",
    75  			js:           `{"minRingSize": 5000, "maxRingSize": 6000}`,
    76  			envConfigCap: 8000,
    77  			want:         &LBConfig{MinRingSize: 5000, MaxRingSize: 6000},
    78  		},
    79  		{
    80  			name:         "min and max greater than raised global limit",
    81  			js:           `{"minRingSize": 10000, "maxRingSize": 10000}`,
    82  			envConfigCap: 8000,
    83  			want:         &LBConfig{MinRingSize: 8000, MaxRingSize: 8000},
    84  		},
    85  		{
    86  			name:    "min greater than upper bound",
    87  			js:      `{"minRingSize": 8388610, "maxRingSize": 10}`,
    88  			want:    nil,
    89  			wantErr: true,
    90  		},
    91  		{
    92  			name:    "max greater than upper bound",
    93  			js:      `{"minRingSize": 10, "maxRingSize": 8388610}`,
    94  			want:    nil,
    95  			wantErr: true,
    96  		},
    97  	}
    98  	for _, tt := range tests {
    99  		t.Run(tt.name, func(t *testing.T) {
   100  			if tt.envConfigCap != 0 {
   101  				old := envconfig.RingHashCap
   102  				defer func() { envconfig.RingHashCap = old }()
   103  				envconfig.RingHashCap = tt.envConfigCap
   104  			}
   105  			got, err := parseConfig([]byte(tt.js))
   106  			if (err != nil) != tt.wantErr {
   107  				t.Errorf("parseConfig() error = %v, wantErr %v", err, tt.wantErr)
   108  				return
   109  			}
   110  			if diff := cmp.Diff(got, tt.want); diff != "" {
   111  				t.Errorf("parseConfig() got unexpected output, diff (-got +want): %v", diff)
   112  			}
   113  		})
   114  	}
   115  }
   116
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