goriak

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README

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Current version: v2.4.0. Riak KV version: 2.0 or higher, the latest version of Riak KV is always recommended.

What is goriak?

goriak is a wrapper around riak-go-client to make it easier and more friendly for developers to use Riak KV.

Installation

go get -u gopkg.in/zegl/goriak.v2

Maps (Riak Data Types)

The main feature of goriak is that goriak automatically can marshal/unmarshal your Go types into Riak data types.

Set (Riak Data Types)

In the example below Name will be saved as a register, and Aliases will be a set.

type User struct {
    Name    string
    Aliases []string
}

user := User {
    Name:   "Foo",
    Alises: []string{"Foo", "Bar"},
}

goriak.Bucket("bucket-name", "bucket-type").Key("key").Set(user).Run(c)
Tags

Struct tags can be used to change the name of the item, or to ignore it.

type User struct {
    Name    string   `goriak:"-"`       // Ignore field
    Aliases []string `goriak:"aliases"` // Save as "aliases" in Riak KV
}

Get (Riak Data Types)

The map can later be retreived as a whole:

var res User
goriak.Bucket("bucket-name", "bucket-type").Key("key").Get(&res).Run(c)

Supported Go types

Go Type Riak Type
struct map
string register
[n]byte register
[]byte register
[]slice set
[]slice set
[][]byte set
map map
time.Time register
int [1] register

1: All signed and unsigned integer types are supported.

Golang map types

Supported key types: all integer types, string.
Supported value types: string, []byte.

Helper types

Some actions are more complicated then necessary with the use of the default Go types and MapOperations.

This is why goriak contains the types goriak.Counter, goriak.Set and, goriak.Flag. Both of these types will help you performing actions such as incrementing a value, or adding/removing items.

Counters

Riak Counters is supported with the special goriak.Counter type.

Example:

type Article struct {
    Title string
    Views *goriak.Counter
}

// Get our object
var article Article
goriak.Bucket("articles", "map").Key("1-hello-world").Get(&article).Run(con)

// Increase views by 1
err := article.Views.Increase(1).Exec(con)

// check err

Counter.Exec(con) will make a lightweight request to Riak, and the counter is the only object that will be updated.

You can also save the changes to your counter with SetMap(), this is useful if you want to change multiple counters at the same time.

Check godoc for more information.

Sets

You can chose to use goriak.Set to help you with Set related actions, such as adding and removing items. goriak.Set also has support for sending incremental actions to Riak so that you don't have to build that functionality yourself.

Example:

type Article struct {
    Title string
    Tags *goriak.Set
}

// Get our object
var article Article
goriak.Bucket("articles", "map").Key("1-hello-world").Get(&article).Run(con)

// Add the tag "animals"
err := article.Tags.AddString("animals").Exec(con)

// check err

Check godoc for more information.

Values

Values can be automatically JSON Marshalled/Unmarshalled by using SetJSON() and GetJSON(). There is also SetRaw() and GetRaw() that works directly on []bytes.

SetJSON

goriak.Bucket("bucket-name", "bucket-type").Key("key").SetJSON(obj).Run(con)

GetJSON

goriak.Bucket("bucket-name", "bucket-type").Key("key").GetJSON(&obj).Run(con)

MapOperation

There is a time in everyones life where you need to perform raw MapOperations on your Riak Data Values.

Some operations, such as RemoveFromSet requires a Context to perform the operation. A Context can be retreived from Get by setting a special context type.

type ourType struct {
    Aliases []string

    // The context from Riak will be added if the tag goriakcontext is provided
    Context []byte `goriak:"goriakcontext"`
}

// ... GetMap()

// Works with MapOperation from github.com/basho/riak-go-client
operation := goriak.NewMapOperation()
operation.AddToSet("Aliases", []byte("Baz"))

goriak.MapOperation("bucket-name", "bucket-type", "key", operation, val.Context)

Secondary Indexes

You can set secondary indexes automatically with SetJSON() by using struct tags.

Strings and all signed integer types are supported. Both as-is and in slices.

type User struct {
    Name    string `goriakindex:"nameindex_bin"`
    Aliases []string
}

Indexes can also be used in slices. If you are using a slice every value in the slice will be added to the index.

type User struct {
    Aliases []string `goriakindex:"aliasesindex_bin"`
}

When saved the next time the index will be updated.

KeysInIndex

Keys in a particular index can be retreived with KeysInIndex.

callback := func(item goriak.SecondaryIndexQueryResult) {
    // use item
}

goriak.Bucket("bucket-name", "bucket-type").
    KeysInIndex("nameindex_bin", "Value", callback).
    Run(con)

AddToIndex

An alternative way of setting Secondary Indexes is by using AddToIndex().

goriak.Bucket("bucket-name", "bucket-type").
    AddToIndex("indexname_bin", "value").
    SetRaw(data).
    Run(con)

Documentation

Overview

Package goriak is a Golang driver for Riak KV. Goriak offers simple ways of binding your Go datatypes and values to Riak.

Goriaks specially is dealing with Riak KV Data Types (http://docs.basho.com/riak/kv/2.1.4/developing/data-types/) and allowing Marshal/Unmarshal of Go structs into Riak Maps.

Index

Examples

Constants

This section is empty.

Variables

This section is empty.

Functions

func NewMapOperation 

func NewMapOperation() riak.MapOperation

NewMapOperation returns a new riak.MapOperation that you can for advanced Riak operations

Types

type Command 

type Command struct {
	// contains filtered or unexported fields
}

Command is the main query builder object

func Bucket 

func Bucket(bucket, bucketType string) Command

Bucket specifies the bucket and bucket type that your following command will be performed on.

func (Command) AddToIndex 

func (c Command) AddToIndex(key, value string) Command

func (Command) AllKeys 

func (c Command) AllKeys(callback func([]string) error) Command

AllKeys returns all keys in the set bucket. The response will be sent in multiple batches to callback

func (Command) ConflictResolver 

func (c Command) ConflictResolver(fn func([]ConflictObject) ResolvedConflict) Command

func (Command) Delete 

func (c Command) Delete(key string) Command

Delete deletes the value stored as key

func (Command) Get 

func (c Command) Get(key string, output interface{}) Command

Get retreives a Map from Riak. Get performs automatic conversion from Riak Maps to your Go datatype. See Set() for more information.

func (Command) GetJSON 

func (c Command) GetJSON(key string, output interface{}) Command

GetJSON is the same as GetRaw, but with automatic JSON unmarshalling

func (Command) GetRaw 

func (c Command) GetRaw(key string, output *[]byte) Command

GetRaw retreives key as a []byte. The output will be written to output by Run().

func (Command) Key 

func (c Command) Key(key string) Command

Key specifies the Riak key that following commands such as Get() and MapOperation()

func (Command) KeysInIndex 

func (c Command) KeysInIndex(indexName, indexValue string, callback func(SecondaryIndexQueryResult)) Command

KeysInIndex returns all keys in the index indexName that has the value indexValue The values will be returned to the callbak function When all keys have been returned SecondaryIndexQueryResult.IsComplete will be true

func (Command) Limit 

func (c Command) Limit(limit uint32) Command

Limit sets the limit returned in KeysInIndex A limit of 0 means unlimited

func (Command) MapOperation 

func (c Command) MapOperation(op riak.MapOperation, context []byte) Command

MapOperation takes a riak.MapOperation so that you can run custom commands on your Riak Maps

func (Command) Run 

func (c Command) Run(session *Session) (*Result, error)

Run performs the action built in Command and runs it against the Riak connection specified by Session.

func (Command) Set 

func (c Command) Set(val interface{}) Command

Set automatically converts your Go datatype to the equivalent type in Riak 

|  Go Type   | Riak Type |
|------------|-----------|
| struct     | map       |
| string     | register  |
| [n]byte    | register  |
| []byte     | register  |
| []slice    | set       |
| []slice    | set       |
| [][]byte   | set       |
| map        | map       |
| time.Time  | register  |

func (Command) SetJSON 

func (c Command) SetJSON(value interface{}) Command

SetJSON saves value as key in the bucket bucket/bucketType Values can automatically be added to indexes with the struct tag goriakindex

func (Command) SetRaw 

func (c Command) SetRaw(value []byte) Command

SetRaw allows you to set a []byte directly to Riak. SetRaw gives you full control of the data stored, compared to SetJSON and Set.

func (Command) VClock 

func (c Command) VClock(vclock []byte) Command

func (Command) WithDw 

func (c Command) WithDw(dw uint32) Command

WithDw sets the amount of nodes required to report sucessfully writes to backend storage. Used with Set(), SetRaw(), SetJSON(), and Delete()

func (Command) WithPr 

func (c Command) WithPr(pr uint32) Command

WithPr sets the amount of primary nodes required to report back during reads. Used with Get(), GetRaw(), GetJSON(), and Delete().

func (Command) WithPw 

func (c Command) WithPw(pw uint32) Command

WithPw sets the amount of primary nodes required to report back during writes. Used with Set(), SetRaw(), SetJSON(), and Delete().

func (Command) WithR 

func (c Command) WithR(r uint32) Command

WithR sets the amount of nodes required to report back during reads. Used with Get(), GetRaw(), GetJSON(), and Delete().

func (Command) WithRw 

func (c Command) WithRw(rw uint32) Command

WithRw sets the amount fo nodes required to report successfull deletes from backend storage. Used with Delete().

func (Command) WithW 

func (c Command) WithW(w uint32) Command

WithW sets the amount of nodes required to report back during writes. Used with Set(), SetRaw(), SetJSON(), and Delete().

type ConflictObject 

type ConflictObject struct {
	Value        []byte
	VClock       []byte
	LastModified time.Time
}

func (ConflictObject) GetResolved 

func (r ConflictObject) GetResolved() ResolvedConflict

GetResolved creates a ResolvedConflict object

type ConflictResolver 

type ConflictResolver interface {
	ConflictResolver([]ConflictObject) ResolvedConflict
}

The ConflictResolver interface is used to solve conflicts when using Get() and GetJSON(). All versions will be sent to your ConflictResolver method. Return the (merged) version that you want to keep.

Example 
// For this to work you need to activate allow_mult on your bucket type
// http://docs.basho.com/riak/kv/2.2.0/developing/usage/conflict-resolution/

session, _ := Connect(ConnectOpts{
	Address: "127.0.0.1",
})

key := "object-1"

// Save the same object without using .VClock() causing a conflict
_, err := Bucket("bucket", "tests").Key(key).SetJSON("hello").Run(session)

if err != nil {
	log.Println(err)
}

_, err = Bucket("bucket", "tests").Key(key).SetJSON("worlds of conflicts!").Run(session)

if err != nil {
	log.Println(err)
}

// Our conflict resolver object
resolver := func(objs []ConflictObject) ResolvedConflict {
	// Decide how to pick the result. We'll use len() to pick the longest value
	var maxObject ConflictObject
	var maxValue int

	for _, o := range objs {
		if len(o.Value) > maxValue {
			maxObject = o
			maxValue = len(o.Value)
		}
	}

	// Convert directly to a ResolvedConflict object
	return maxObject.GetResolved()
}

// Get your object
var res string
_, err = Bucket("bucket", "tests").
	ConflictResolver(resolver).
	GetJSON(key, &res).
	Run(session)

if err != nil {
	log.Println(err)
}

// res will now contain the longest value
log.Println(res)

Output:

type ConnectOpts 

type ConnectOpts struct {
	// Both Address and Addresses should be on the form HOST|IP[:PORT]
	Address   string   // Address to a single Riak host. Will be used in case Addresses is empty
	Addresses []string // Addresses to all Riak hosts.
}

ConnectOpts are the available options for connecting to your Riak instance

type Counter 

type Counter struct {
	// contains filtered or unexported fields
}

Counter is a wapper to handle Riak Counters Counter needs to be initialized by GetMap() to fully function

func NewCounter 

func NewCounter() *Counter

NewCounter returns a partial Counter Counters returned by NewCounter() can only be updated with SetMap(). Counter.Exec() will not work on counters returned by NewCounter()

func (*Counter) Exec 

func (c *Counter) Exec(client *Session) error

Exec saves changes made to the Counter to Riak Exec only works on Counters initialized by GetMap() If the commad succeeds the counter will be updated with the value in the response from Riak

func (*Counter) Increase 

func (c *Counter) Increase(i int64) *Counter

Increase the value in the Counter by i The value in Counter.Value() will be updated directly Increase() will not save the changes to Riak directly

func (*Counter) Value 

func (c *Counter) Value() int64

Value returns the value in the Counter

type Flag 

type Flag struct {
	// contains filtered or unexported fields
}

func NewFlag 

func NewFlag() *Flag

func (*Flag) Exec 

func (f *Flag) Exec(client *Session) error

func (*Flag) Set 

func (f *Flag) Set(val bool) *Flag

func (*Flag) Value 

func (f *Flag) Value() bool

type Register 

type Register struct {
	// contains filtered or unexported fields
}

func NewRegister 

func NewRegister() *Register

func (*Register) Exec 

func (r *Register) Exec(client *Session) error

func (*Register) Set 

func (r *Register) Set(val []byte) *Register

func (*Register) SetString 

func (r *Register) SetString(val string) *Register

func (*Register) String 

func (r *Register) String() string

func (*Register) Value 

func (r *Register) Value() []byte

type ResolvedConflict 

type ResolvedConflict struct {
	Value  []byte
	VClock []byte
}

type Result 

type Result struct {
	NotFound bool   // Wether or not the item was not found when using Get, GetJSON, or GetRaw.
	Key      string // Returns your automatically generated key when using Set, SetJSON, or SetRaw.
	Context  []byte // Returns the Riak Context used in map operations. Is set when using Get.
	VClock   []byte
}

Result contains your query result data from Run()

type SecondaryIndexQueryResult 

type SecondaryIndexQueryResult struct {
	Key        string
	IsComplete bool
}

SecondaryIndexQueryResult is the items sent to the callback function used by KeysInIndex

type Session 

type Session struct {
	// contains filtered or unexported fields
}

Session holds the connection to Riak

func Connect 

func Connect(opts ConnectOpts) (*Session, error)

Connect creates a new Riak connection. See ConnectOpts for the available options.

type Set added in v1.1.0 

type Set struct {
	// contains filtered or unexported fields
}

Set is a special type to make it easier to work with Riak Sets in Go.

Example 
session, _ := Connect(ConnectOpts{
	Address: "127.0.0.1",
})

type Article struct {
	Tags *Set

	Context []byte `goriak:"goriakcontext"`
}

// Initializing a new Article and the Set within
art := Article{
	Tags: NewSet(),
}

riakKey := "article-1"

// Adding the tags "one" and "two"
art.Tags.AddString("one")
art.Tags.AddString("two")

_, err := Bucket("bucket", "bucketType").Key(riakKey).Set(art).Run(session)

if err != nil {
	// ..
}

// Retreiving from Riak
var getArt Article
_, err = Bucket("bucket", "bucketType").Get(riakKey, &getArt).Run(session)

if err != nil {
	// ..
}

// Adding one extra tag.
// Multiple AddString() and RemoveString() can be chained together before calling Exec().
err = getArt.Tags.AddString("three").Exec(session)

if err != nil {
	// ..
}

Output:

func NewSet added in v1.1.0 

func NewSet() *Set

NewSet returnes a new and empty Set. Sets returned from NewSet() can not be used with Set.Exec()

func (*Set) Add added in v1.1.0 

func (s *Set) Add(add []byte) *Set

Add adds an item to the direct value of the Set. Save the changes to Riak with Set.Exec() or SetMap().

func (*Set) AddString added in v1.1.0 

func (s *Set) AddString(add string) *Set

AddString is a shortcut to Add

func (*Set) Exec added in v1.1.0 

func (s *Set) Exec(client *Session) error

Exec executes the diff created by Add() and Remove(), and saves the data to Riak

func (*Set) Has 

func (s *Set) Has(search []byte) bool

Has returns true if search is a value in the set

func (*Set) HasString 

func (s *Set) HasString(search string) bool

HasString returns true if search is a value in the set

func (Set) MarshalJSON 

func (s Set) MarshalJSON() ([]byte, error)

MarshalJSON satisfies the JSON interface

func (*Set) Remove added in v1.1.0 

func (s *Set) Remove(remove []byte) *Set

Remove deletes an item to the direct value of the Set. Save the changes to Riak with Set.Exec() or SetMap().

func (*Set) RemoveString added in v1.1.0 

func (s *Set) RemoveString(remove string) *Set

RemoveString is a shortcut to Remove

func (*Set) Strings added in v1.1.0 

func (s *Set) Strings() []string

Strings returns the same data as Value(), but encoded as strings

func (*Set) UnmarshalJSON 

func (s *Set) UnmarshalJSON(data []byte) error

UnmarshalJSON satisfies the JSON interface

func (*Set) Value added in v1.1.0 

func (s *Set) Value() [][]byte

Value returnes the raw values from the Set

Source Files

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