4e56dafecc
Move a lot of common error logging into better buckets:
glog.Errorf() - Always an error
glog.Warningf() - Something unexpected, but probably not an error
glog.V(0) - Generally useful for this to ALWAYS be visible
to an operator
* Programmer errors
* Logging extra info about a panic
* CLI argument handling
glog.V(1) - A reasonable default log level if you don't want
verbosity
* Information about config (listening on X, watching Y)
* Errors that repeat frequently that relate to conditions
that can be corrected (pod detected as unhealthy)
glog.V(2) - Useful steady state information about the service
* Logging HTTP requests and their exit code
* System state changing (killing pod)
* Controller state change events (starting pods)
* Scheduler log messages
glog.V(3) - Extended information about changes
* More info about system state changes
glog.V(4) - Debug level verbosity (for now)
* Logging in particularly thorny parts of code where
you may want to come back later and check it
63 lines
2.0 KiB
Go
63 lines
2.0 KiB
Go
/*
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Copyright 2014 Google Inc. All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cloudprovider
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import (
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"io"
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"sync"
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"github.com/golang/glog"
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)
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// Factory is a function that returns a cloudprovider.Interface.
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// The config parameter provides an io.Reader handler to the factory in
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// order to load specific configurations. If no configuration is provided
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// the parameter is nil.
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type Factory func(config io.Reader) (Interface, error)
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// All registered cloud providers.
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var providersMutex sync.Mutex
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var providers = make(map[string]Factory)
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// RegisterCloudProvider registers a cloudprovider.Factory by name. This
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// is expected to happen during app startup.
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func RegisterCloudProvider(name string, cloud Factory) {
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providersMutex.Lock()
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defer providersMutex.Unlock()
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_, found := providers[name]
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if found {
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glog.Fatalf("Cloud provider %q was registered twice", name)
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}
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glog.V(1).Infof("Registered cloud provider %q", name)
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providers[name] = cloud
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}
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// GetCloudProvider creates an instance of the named cloud provider, or nil if
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// the name is not known. The error return is only used if the named provider
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// was known but failed to initialize. The config parameter specifies the
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// io.Reader handler of the configuration file for the cloud provider, or nil
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// for no configuation.
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func GetCloudProvider(name string, config io.Reader) (Interface, error) {
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providersMutex.Lock()
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defer providersMutex.Unlock()
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f, found := providers[name]
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if !found {
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return nil, nil
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}
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return f(config)
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}
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