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83 lines
2.5 KiB
83 lines
2.5 KiB
// Copyright 2015 clair authors
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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// Package health defines a standard healthcheck response format and expose
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// a function that summarizes registered healthchecks.
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package health
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import (
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"fmt"
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"sync"
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"github.com/coreos/clair/database"
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)
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// Status defines a way to know the health status of a service
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type Status struct {
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// IsEssential determines if the service is essential to the app, which can't
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// run in case of a failure
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IsEssential bool
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// IsHealthy defines whether the service is working or not
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IsHealthy bool
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// Details gives informations specific to the service
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Details interface{}
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}
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// A Healthchecker function is a method returning the Status of the tested service
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type Healthchecker func(database.Datastore) Status
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var (
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healthcheckersLock sync.Mutex
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healthcheckers = make(map[string]Healthchecker)
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)
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// RegisterHealthchecker registers a Healthchecker function which will be part of Healthchecks
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func RegisterHealthchecker(name string, f Healthchecker) {
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if name == "" {
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panic("Could not register a Healthchecker with an empty name")
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}
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if f == nil {
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panic("Could not register a nil Healthchecker")
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}
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healthcheckersLock.Lock()
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defer healthcheckersLock.Unlock()
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if _, alreadyExists := healthcheckers[name]; alreadyExists {
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panic(fmt.Sprintf("Healthchecker '%s' is already registered", name))
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}
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healthcheckers[name] = f
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}
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// Healthcheck calls every registered Healthchecker and summarize their output
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func Healthcheck(datastore database.Datastore) (bool, map[string]interface{}) {
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globalHealth := true
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statuses := make(map[string]interface{})
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for serviceName, serviceChecker := range healthcheckers {
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status := serviceChecker(datastore)
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globalHealth = globalHealth && (!status.IsEssential || status.IsHealthy)
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statuses[serviceName] = struct {
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IsHealthy bool
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Details interface{} `json:",omitempty"`
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}{
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IsHealthy: status.IsHealthy,
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Details: status.Details,
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}
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}
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return globalHealth, statuses
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}
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