etcd

package
Version: v0.7.0 Latest Latest
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Published: Dec 22, 2014 License: Apache-2.0 Imports: 19 Imported by: 0

Documentation

Index

Constants

View Source
const (
	// Using strings rather than iota because the consistency level
	// could be persisted to disk, so it'd be better to use
	// human-readable values.
	STRONG_CONSISTENCY = "STRONG"
	WEAK_CONSISTENCY   = "WEAK"
)

See SetConsistency for how to use these constants.

View Source
const (
	ErrCodeEtcdNotReachable = 501
)

Variables

View Source
var (
	VALID_GET_OPTIONS = validOptions{
		"recursive":  reflect.Bool,
		"consistent": reflect.Bool,
		"sorted":     reflect.Bool,
		"wait":       reflect.Bool,
		"waitIndex":  reflect.Uint64,
	}

	VALID_PUT_OPTIONS = validOptions{
		"prevValue": reflect.String,
		"prevIndex": reflect.Uint64,
		"prevExist": reflect.Bool,
		"dir":       reflect.Bool,
	}

	VALID_POST_OPTIONS = validOptions{
		"dir": reflect.Bool,
	}

	VALID_DELETE_OPTIONS = validOptions{
		"recursive": reflect.Bool,
		"dir":       reflect.Bool,
		"prevValue": reflect.String,
		"prevIndex": reflect.Uint64,
	}
)

Valid options for GET, PUT, POST, DELETE Using CAPITALIZED_UNDERSCORE to emphasize that these values are meant to be used as constants.

View Source
var (
	ErrRequestCancelled = errors.New("sending request is cancelled")
)

Errors introduced by handling requests

View Source
var (
	ErrWatchStoppedByUser = errors.New("Watch stopped by the user via stop channel")
)

Errors introduced by the Watch command.

Functions

func DefaultCheckRetry

func DefaultCheckRetry(cluster *Cluster, numReqs int, lastResp http.Response,
	err error) error

DefaultCheckRetry defines the retrying behaviour for bad HTTP requests If we have retried 2 * machine number, stop retrying. If status code is InternalServerError, sleep for 200ms.

func GetLogger

func GetLogger() *log.Logger

func SetLogger

func SetLogger(l *log.Logger)

Types

type Client

type Client struct {

	// CheckRetry can be used to control the policy for failed requests
	// and modify the cluster if needed.
	// The client calls it before sending requests again, and
	// stops retrying if CheckRetry returns some error. The cases that
	// this function needs to handle include no response and unexpected
	// http status code of response.
	// If CheckRetry is nil, client will call the default one
	// `DefaultCheckRetry`.
	// Argument cluster is the etcd.Cluster object that these requests have been made on.
	// Argument numReqs is the number of http.Requests that have been made so far.
	// Argument lastResp is the http.Responses from the last request.
	// Argument err is the reason of the failure.
	CheckRetry func(cluster *Cluster, numReqs int,
		lastResp http.Response, err error) error
	// contains filtered or unexported fields
}

func NewClient

func NewClient(machines []string) *Client

NewClient create a basic client that is configured to be used with the given machine list.

func NewClientFromFile

func NewClientFromFile(fpath string) (*Client, error)

NewClientFromFile creates a client from a given file path. The given file is expected to use the JSON format.

func NewClientFromReader

func NewClientFromReader(reader io.Reader) (*Client, error)

NewClientFromReader creates a Client configured from a given reader. The configuration is expected to use the JSON format.

func NewTLSClient

func NewTLSClient(machines []string, cert, key, caCert string) (*Client, error)

NewTLSClient create a basic client with TLS configuration

func (*Client) AddChild

func (c *Client) AddChild(key string, value string, ttl uint64) (*Response, error)

Add a new file with a random etcd-generated key under the given path.

func (*Client) AddChildDir

func (c *Client) AddChildDir(key string, ttl uint64) (*Response, error)

Add a new directory with a random etcd-generated key under the given path.

func (*Client) AddRootCA

func (c *Client) AddRootCA(caCert string) error

AddRootCA adds a root CA cert for the etcd client

func (*Client) Close

func (c *Client) Close()

func (*Client) CloseCURL

func (c *Client) CloseCURL()

func (*Client) CompareAndDelete

func (c *Client) CompareAndDelete(key string, prevValue string, prevIndex uint64) (*Response, error)

func (*Client) CompareAndSwap

func (c *Client) CompareAndSwap(key string, value string, ttl uint64,
	prevValue string, prevIndex uint64) (*Response, error)

func (*Client) Create

func (c *Client) Create(key string, value string, ttl uint64) (*Response, error)

Create creates a file with the given value under the given key. It succeeds only if the given key does not yet exist.

func (*Client) CreateDir

func (c *Client) CreateDir(key string, ttl uint64) (*Response, error)

CreateDir creates a directory. It succeeds only if the given key does not yet exist.

func (*Client) CreateInOrder

func (c *Client) CreateInOrder(dir string, value string, ttl uint64) (*Response, error)

CreateInOrder creates a file with a key that's guaranteed to be higher than other keys in the given directory. It is useful for creating queues.

func (*Client) Delete

func (c *Client) Delete(key string, recursive bool) (*Response, error)

Delete deletes the given key.

When recursive set to false, if the key points to a directory the method will fail.

When recursive set to true, if the key points to a file, the file will be deleted; if the key points to a directory, then everything under the directory (including all child directories) will be deleted.

func (*Client) DeleteDir

func (c *Client) DeleteDir(key string) (*Response, error)

DeleteDir deletes an empty directory or a key value pair

func (*Client) Get

func (c *Client) Get(key string, sort, recursive bool) (*Response, error)

Get gets the file or directory associated with the given key. If the key points to a directory, files and directories under it will be returned in sorted or unsorted order, depending on the sort flag. If recursive is set to false, contents under child directories will not be returned. If recursive is set to true, all the contents will be returned.

func (*Client) GetCluster

func (c *Client) GetCluster() []string

func (*Client) MarshalJSON

func (c *Client) MarshalJSON() ([]byte, error)

MarshalJSON implements the Marshaller interface as defined by the standard JSON package.

func (*Client) OpenCURL

func (c *Client) OpenCURL()

func (*Client) RawCompareAndDelete

func (c *Client) RawCompareAndDelete(key string, prevValue string, prevIndex uint64) (*RawResponse, error)

func (*Client) RawCompareAndSwap

func (c *Client) RawCompareAndSwap(key string, value string, ttl uint64,
	prevValue string, prevIndex uint64) (*RawResponse, error)

func (*Client) RawCreate

func (c *Client) RawCreate(key string, value string, ttl uint64) (*RawResponse, error)

func (*Client) RawCreateDir

func (c *Client) RawCreateDir(key string, ttl uint64) (*RawResponse, error)

func (*Client) RawCreateInOrder

func (c *Client) RawCreateInOrder(dir string, value string, ttl uint64) (*RawResponse, error)

func (*Client) RawDelete

func (c *Client) RawDelete(key string, recursive bool, dir bool) (*RawResponse, error)

func (*Client) RawGet

func (c *Client) RawGet(key string, sort, recursive bool) (*RawResponse, error)

func (*Client) RawSet

func (c *Client) RawSet(key string, value string, ttl uint64) (*RawResponse, error)

func (*Client) RawSetDir

func (c *Client) RawSetDir(key string, ttl uint64) (*RawResponse, error)

func (*Client) RawUpdate

func (c *Client) RawUpdate(key string, value string, ttl uint64) (*RawResponse, error)

func (*Client) RawUpdateDir

func (c *Client) RawUpdateDir(key string, ttl uint64) (*RawResponse, error)

func (*Client) RawWatch

func (c *Client) RawWatch(prefix string, waitIndex uint64, recursive bool,
	receiver chan *RawResponse, stop chan bool) (*RawResponse, error)

func (*Client) RecvCURL

func (c *Client) RecvCURL() string

func (*Client) SendRequest

func (c *Client) SendRequest(rr *RawRequest) (*RawResponse, error)

SendRequest sends a HTTP request and returns a Response as defined by etcd

func (*Client) Set

func (c *Client) Set(key string, value string, ttl uint64) (*Response, error)

Set sets the given key to the given value. It will create a new key value pair or replace the old one. It will not replace a existing directory.

func (*Client) SetCluster

func (c *Client) SetCluster(machines []string) bool

SetCluster updates cluster information using the given machine list.

func (*Client) SetConsistency

func (c *Client) SetConsistency(consistency string) error

SetConsistency changes the consistency level of the client.

When consistency is set to STRONG_CONSISTENCY, all requests, including GET, are sent to the leader. This means that, assuming the absence of leader failures, GET requests are guaranteed to see the changes made by previous requests.

When consistency is set to WEAK_CONSISTENCY, other requests are still sent to the leader, but GET requests are sent to a random server from the server pool. This reduces the read load on the leader, but it's not guaranteed that the GET requests will see changes made by previous requests (they might have not yet been committed on non-leader servers).

func (*Client) SetDialTimeout

func (c *Client) SetDialTimeout(d time.Duration)

Sets the DialTimeout value

func (*Client) SetDir

func (c *Client) SetDir(key string, ttl uint64) (*Response, error)

Set sets the given key to a directory. It will create a new directory or replace the old key value pair by a directory. It will not replace a existing directory.

func (*Client) SetPersistence

func (c *Client) SetPersistence(writer io.Writer)

SetPersistence sets a writer to which the config will be written every time it's changed.

func (*Client) SetTransport

func (c *Client) SetTransport(tr *http.Transport)

Override the Client's HTTP Transport object

func (*Client) SyncCluster

func (c *Client) SyncCluster() bool

SyncCluster updates the cluster information using the internal machine list.

func (*Client) UnmarshalJSON

func (c *Client) UnmarshalJSON(b []byte) error

UnmarshalJSON implements the Unmarshaller interface as defined by the standard JSON package.

func (*Client) Update

func (c *Client) Update(key string, value string, ttl uint64) (*Response, error)

Update updates the given key to the given value. It succeeds only if the given key already exists.

func (*Client) UpdateDir

func (c *Client) UpdateDir(key string, ttl uint64) (*Response, error)

UpdateDir updates the given directory. It succeeds only if the given key already exists.

func (*Client) Watch

func (c *Client) Watch(prefix string, waitIndex uint64, recursive bool,
	receiver chan *Response, stop chan bool) (*Response, error)

If recursive is set to true the watch returns the first change under the given prefix since the given index.

If recursive is set to false the watch returns the first change to the given key since the given index.

To watch for the latest change, set waitIndex = 0.

If a receiver channel is given, it will be a long-term watch. Watch will block at the channel. After someone receives the channel, it will go on to watch that prefix. If a stop channel is given, the client can close long-term watch using the stop channel.

type Cluster

type Cluster struct {
	Leader   string   `json:"leader"`
	Machines []string `json:"machines"`
}

func NewCluster

func NewCluster(machines []string) *Cluster

type Config

type Config struct {
	CertFile    string        `json:"certFile"`
	KeyFile     string        `json:"keyFile"`
	CaCertFile  []string      `json:"caCertFiles"`
	DialTimeout time.Duration `json:"timeout"`
	Consistency string        `json:"consistency"`
}

type EtcdError

type EtcdError struct {
	ErrorCode int    `json:"errorCode"`
	Message   string `json:"message"`
	Cause     string `json:"cause,omitempty"`
	Index     uint64 `json:"index"`
}

func (EtcdError) Error

func (e EtcdError) Error() string

type Node

type Node struct {
	Key           string     `json:"key, omitempty"`
	Value         string     `json:"value,omitempty"`
	Dir           bool       `json:"dir,omitempty"`
	Expiration    *time.Time `json:"expiration,omitempty"`
	TTL           int64      `json:"ttl,omitempty"`
	Nodes         Nodes      `json:"nodes,omitempty"`
	ModifiedIndex uint64     `json:"modifiedIndex,omitempty"`
	CreatedIndex  uint64     `json:"createdIndex,omitempty"`
}

type Nodes

type Nodes []*Node

func (Nodes) Len

func (ns Nodes) Len() int

interfaces for sorting

func (Nodes) Less

func (ns Nodes) Less(i, j int) bool

func (Nodes) Swap

func (ns Nodes) Swap(i, j int)

type Options

type Options map[string]interface{}

type RawRequest

type RawRequest struct {
	Method       string
	RelativePath string
	Values       url.Values
	Cancel       <-chan bool
}

func NewRawRequest

func NewRawRequest(method, relativePath string, values url.Values, cancel <-chan bool) *RawRequest

NewRawRequest returns a new RawRequest

type RawResponse

type RawResponse struct {
	StatusCode int
	Body       []byte
	Header     http.Header
}

func (*RawResponse) Unmarshal

func (rr *RawResponse) Unmarshal() (*Response, error)

Unmarshal parses RawResponse and stores the result in Response

type Response

type Response struct {
	Action    string `json:"action"`
	Node      *Node  `json:"node"`
	PrevNode  *Node  `json:"prevNode,omitempty"`
	EtcdIndex uint64 `json:"etcdIndex"`
	RaftIndex uint64 `json:"raftIndex"`
	RaftTerm  uint64 `json:"raftTerm"`
}

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