client.go

/*
Copyright 2014 Google Inc. All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package client

import (
	"encoding/json"
	"fmt"
	"net"
	"net/url"
	"strings"

	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
	"github.com/GoogleCloudPlatform/kubernetes/pkg/version"
)

// Interface holds the methods for clients of Kubernetes,
// an interface to allow mock testing.
type Interface interface {
	PodsNamespacer
	ReplicationControllersNamespacer
	ServicesNamespacer
	EndpointsNamespacer
	VersionInterface
	NodesInterface
	EventNamespacer
	LimitRangesNamespacer
	ResourceQuotasNamespacer
	SecretsNamespacer
	NamespacesInterface
	PersistentVolumesInterface
	PersistentVolumeClaimsNamespacer
	ComponentStatusesInterface
}

func (c *Client) ReplicationControllers(namespace string) ReplicationControllerInterface {
	return newReplicationControllers(c, namespace)
}

func (c *Client) Nodes() NodeInterface {
	return newNodes(c)
}

func (c *Client) Events(namespace string) EventInterface {
	return newEvents(c, namespace)
}

func (c *Client) Endpoints(namespace string) EndpointsInterface {
	return newEndpoints(c, namespace)
}

func (c *Client) Pods(namespace string) PodInterface {
	return newPods(c, namespace)
}

func (c *Client) Services(namespace string) ServiceInterface {
	return newServices(c, namespace)
}
func (c *Client) LimitRanges(namespace string) LimitRangeInterface {
	return newLimitRanges(c, namespace)
}

func (c *Client) ResourceQuotas(namespace string) ResourceQuotaInterface {
	return newResourceQuotas(c, namespace)
}

func (c *Client) Secrets(namespace string) SecretsInterface {
	return newSecrets(c, namespace)
}

func (c *Client) Namespaces() NamespaceInterface {
	return newNamespaces(c)
}

func (c *Client) PersistentVolumes() PersistentVolumeInterface {
	return newPersistentVolumes(c)
}

func (c *Client) PersistentVolumeClaims(namespace string) PersistentVolumeClaimInterface {
	return newPersistentVolumeClaims(c, namespace)
}

func (c *Client) ComponentStatuses() ComponentStatusInterface {
	return newComponentStatuses(c)
}

// VersionInterface has a method to retrieve the server version.
type VersionInterface interface {
	ServerVersion() (*version.Info, error)
	ServerAPIVersions() (*api.APIVersions, error)
}

// APIStatus is exposed by errors that can be converted to an api.Status object
// for finer grained details.
type APIStatus interface {
	Status() api.Status
}

// Client is the implementation of a Kubernetes client.
type Client struct {
	*RESTClient
}

// ServerVersion retrieves and parses the server's version.
func (c *Client) ServerVersion() (*version.Info, error) {
	body, err := c.Get().AbsPath("/version").Do().Raw()
	if err != nil {
		return nil, err
	}
	var info version.Info
	err = json.Unmarshal(body, &info)
	if err != nil {
		return nil, fmt.Errorf("got '%s': %v", string(body), err)
	}
	return &info, nil
}

// ServerAPIVersions retrieves and parses the list of API versions the server supports.
func (c *Client) ServerAPIVersions() (*api.APIVersions, error) {
	body, err := c.Get().AbsPath("/api").Do().Raw()
	if err != nil {
		return nil, err
	}
	var v api.APIVersions
	err = json.Unmarshal(body, &v)
	if err != nil {
		return nil, fmt.Errorf("got '%s': %v", string(body), err)
	}
	return &v, nil
}

type ComponentValidatorInterface interface {
	ValidateComponents() (*api.ComponentStatusList, error)
}

// ValidateComponents retrieves and parses the master's self-monitored cluster state.
// TODO: This should hit the versioned endpoint when that is implemented.
func (c *Client) ValidateComponents() (*api.ComponentStatusList, error) {
	body, err := c.Get().AbsPath("/validate").DoRaw()
	if err != nil {
		return nil, err
	}

	statuses := []api.ComponentStatus{}
	if err := json.Unmarshal(body, &statuses); err != nil {
		return nil, fmt.Errorf("got '%s': %v", string(body), err)
	}
	return &api.ComponentStatusList{Items: statuses}, nil
}

// IsTimeout tests if this is a timeout error in the underlying transport.
// This is unbelievably ugly.
// See: http://stackoverflow.com/questions/23494950/specifically-check-for-timeout-error for details
func IsTimeout(err error) bool {
	if err == nil {
		return false
	}
	switch err := err.(type) {
	case *url.Error:
		if err, ok := err.Err.(net.Error); ok {
			return err.Timeout()
		}
	case net.Error:
		return err.Timeout()
	}

	if strings.Contains(err.Error(), "use of closed network connection") {
		return true
	}
	return false
}