go.chromium.org/luci@v0.0.0-20240309015107-7cdc2e660f33/gae/filter/count/mod.go (about)

     1  // Copyright 2015 The LUCI Authors.
     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  
    15  package count
    16  
    17  import (
    18  	"context"
    19  
    20  	"go.chromium.org/luci/gae/service/module"
    21  )
    22  
    23  // ModuleCounter is the counter object for the Module service.
    24  type ModuleCounter struct {
    25  	List            Entry
    26  	NumInstances    Entry
    27  	SetNumInstances Entry
    28  	Versions        Entry
    29  	DefaultVersion  Entry
    30  	Start           Entry
    31  	Stop            Entry
    32  }
    33  
    34  type modCounter struct {
    35  	c *ModuleCounter
    36  
    37  	mod module.RawInterface
    38  }
    39  
    40  var _ module.RawInterface = (*modCounter)(nil)
    41  
    42  func (m *modCounter) List() ([]string, error) {
    43  	ret, err := m.mod.List()
    44  	return ret, m.c.List.up(err)
    45  }
    46  
    47  func (m *modCounter) NumInstances(mod, ver string) (int, error) {
    48  	ret, err := m.mod.NumInstances(mod, ver)
    49  	return ret, m.c.NumInstances.up(err)
    50  }
    51  
    52  func (m *modCounter) SetNumInstances(mod, ver string, instances int) error {
    53  	return m.c.SetNumInstances.up(m.mod.SetNumInstances(mod, ver, instances))
    54  }
    55  
    56  func (m *modCounter) Versions(mod string) ([]string, error) {
    57  	ret, err := m.mod.Versions(mod)
    58  	return ret, m.c.Versions.up(err)
    59  }
    60  
    61  func (m *modCounter) DefaultVersion(mod string) (string, error) {
    62  	ret, err := m.mod.DefaultVersion(mod)
    63  	return ret, m.c.DefaultVersion.up(err)
    64  }
    65  
    66  func (m *modCounter) Start(mod, ver string) error {
    67  	return m.c.Start.up(m.mod.Start(mod, ver))
    68  }
    69  
    70  func (m *modCounter) Stop(mod, ver string) error {
    71  	return m.c.Stop.up(m.mod.Stop(mod, ver))
    72  }
    73  
    74  // FilterModule installs a counter Module filter in the context.
    75  func FilterModule(c context.Context) (context.Context, *ModuleCounter) {
    76  	state := &ModuleCounter{}
    77  	return module.AddFilters(c, func(ic context.Context, mod module.RawInterface) module.RawInterface {
    78  		return &modCounter{state, mod}
    79  	}), state
    80  }