Documentation

Index

Constants

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.


const (
	ErrCodeEtcdNotReachable = 501
)

Variables

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{}

	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.


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

Errors introduced by the Watch command.


Functions

func SetLogger

func SetLogger(log Logger)

Types

type Client

type Client struct {
	// 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) 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) 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) 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) 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) 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) SetKeyPrefix

func (c *Client) SetKeyPrefix(prefix string)

SetKeyPrefix changes the key prefix from the default `/v2/keys` to whatever is set.

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"`
	Timeout     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 Logger

type Logger interface {
	Debug(args ...interface{})
	Debugf(fmt string, args ...interface{})
	Warning(args ...interface{})
	Warningf(fmt string, args ...interface{})
}

func GetLogger

func GetLogger() Logger

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 RawResponse

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

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"`
}