139 lines
3.2 KiB
Go
139 lines
3.2 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors 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 registry
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import (
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"fmt"
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"os"
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"sort"
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"github.com/golang/glog"
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)
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const (
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// Podman is Kubernetes in container using podman driver
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Podman = "podman"
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// Docker is Kubernetes in container using docker driver
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Docker = "docker"
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// Mock driver
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Mock = "mock"
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// None driver
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None = "none"
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)
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// IsKIC checks if the driver is a kubernetes in container
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func IsKIC(name string) bool {
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return name == Docker || name == Podman
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}
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// IsMock checks if the driver is a mock
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func IsMock(name string) bool {
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return name == Mock
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}
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// IsVM checks if the driver is a VM
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func IsVM(name string) bool {
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if IsKIC(name) || IsMock(name) || BareMetal(name) {
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return false
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}
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return true
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}
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// BareMetal returns if this driver is unisolated
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func BareMetal(name string) bool {
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return name == None || name == Mock
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}
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var (
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// globalRegistry is a globally accessible driver registry
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globalRegistry = newRegistry()
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)
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// DriverState is metadata relating to a driver and status
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type DriverState struct {
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Name string
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Priority Priority
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State State
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// Rejection is why we chose not to use this driver
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Rejection string
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}
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func (d DriverState) String() string {
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if d.Priority == Experimental {
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return fmt.Sprintf("%s (experimental)", d.Name)
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}
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return d.Name
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}
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// List lists drivers in global registry
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func List() []DriverDef {
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return globalRegistry.List()
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}
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// Register registers driver with the global registry
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func Register(driver DriverDef) error {
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return globalRegistry.Register(driver)
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}
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// Driver gets a named driver from the global registry
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func Driver(name string) DriverDef {
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return globalRegistry.Driver(name)
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}
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// Available returns a list of available drivers in the global registry
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func Available(vm bool) []DriverState {
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sts := []DriverState{}
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glog.Infof("Querying for installed drivers using PATH=%s", os.Getenv("PATH"))
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for _, d := range globalRegistry.List() {
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if d.Status == nil {
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glog.Errorf("%q does not implement Status", d.Name)
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continue
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}
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s := d.Status()
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glog.Infof("%s priority: %d, state: %+v", d.Name, d.Priority, s)
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priority := d.Priority
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if !s.Healthy {
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priority = Unhealthy
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}
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if vm {
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if IsVM(d.Name) {
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sts = append(sts, DriverState{Name: d.Name, Priority: priority, State: s})
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}
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} else {
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sts = append(sts, DriverState{Name: d.Name, Priority: priority, State: s})
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}
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}
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// Descending priority for predictability
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sort.Slice(sts, func(i, j int) bool {
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return sts[i].Priority > sts[j].Priority
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})
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return sts
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}
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// Status returns the state of a driver within the global registry
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func Status(name string) State {
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d := globalRegistry.Driver(name)
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if d.Empty() {
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return State{}
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}
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return d.Status()
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}
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