common

Documentation

Overview

Package common contains common shared types, variables and constants used throughout the project

Index

• Constants
• Variables
• func EncodeMessage(typ MessageType, msg interface{}) ([]byte, error)
• func PrependMessageType(typ MessageType, data []byte) []byte
• type Board
• type BoardThread
• type Client
• type Command
• type CommandType
• type ErrTooLong
  • func (e ErrTooLong) Error() string
• type Image
• type ImageCommon
• type MessageType
• type Post
• type StandalonePost
• type Thread
• type ThreadCommon

Constants

const (
	JPEG = iota
	PNG
	GIF
	WEBM
	PDF
	SVG
	MP4
	MP3
	OGG
	ZIP
	SevenZip
	TGZ
	TXZ
)

Supported file formats

const (
	MaxLenName         = 50
	MaxLenAuth         = 50
	MaxLenPostPassword = 100
	MaxLenSubject      = 100
	MaxLenBody         = 2000
	MaxLenPassword     = 50
	MaxLenUserID       = 20
	MaxLenBoardID      = 3
	MaxLenBoardTitle   = 100
	MaxLenNotice       = 500
	MaxLenRules        = 5000
	MaxLenEightball    = 2000
	MaxBanReasonLength = 100
)

Maximum lengths of various string input fields

const (
	LenSession    = 171
	LenImageToken = 86
)

Various cryptographic token exact lengths

Variables

var (
	ErrNameTooLong         = ErrTooLong("name")
	ErrSubjectTooLong      = ErrTooLong("subject")
	ErrPostPasswordTooLong = ErrTooLong("post password")
	ErrBodyTooLong         = ErrTooLong("post body")
	ErrInvalidCreds        = errors.New("invalid login credentials")
	ErrContainsNull        = errors.New("null byte in non-concatenated message")
)

Commonly used errors

var Clients interface {
	Clear()
	GetByIP(ip string) []Client
}

Clients exposes the global client map to all packages without causing circular imports

var Extensions = map[uint8]string{
	JPEG:     "jpg",
	PNG:      "png",
	GIF:      "gif",
	MP3:      "mp3",
	MP4:      "mp4",
	WEBM:     "webm",
	OGG:      "ogg",
	PDF:      "pdf",
	ZIP:      "zip",
	SevenZip: "7z",
	TGZ:      "tar.gz",
	TXZ:      "tar.xz",
}

Extensions maps internal file types to their canonical file extensions

var ParseBody func([]byte, string) ([][2]uint64, []Command, error)

ParseBody forwards parser.ParseBody to avoid cyclic imports in db/upkeep

Functions

func EncodeMessage

func EncodeMessage(typ MessageType, msg interface{}) ([]byte, error)

EncodeMessage encodes a message for sending through websockets or writing to the replication log.

func PrependMessageType

func PrependMessageType(typ MessageType, data []byte) []byte

PrependMessageType prepends the encoded websocket message type to an already encoded message

Types

type Board

type Board []BoardThread

Board is an array stripped down version of Thread for whole-board retrieval queries. Reduces server memory usage and served JSON payload.

type BoardThread

type BoardThread struct {
	ThreadCommon
	ID    uint64 `json:"id"`
	Time  int64  `json:"time"`
	Name  string `json:"name,omitempty"`
	Trip  string `json:"trip,omitempty"`
	Auth  string `json:"auth,omitempty"`
	Image *Image `json:"image,omitempty"`
}

BoardThread is a stripped down version of Thread for board catalog queries

type Client

type Client interface {
	Redirect(board string)
}

Client exposes some globally accessible websocket client functionality without causing circular imports

type Command

type Command struct {
	Type CommandType `json:"type"`
	Val  interface{} `json:"val"`
}

Command contains the type and value array of hash commands, such as dice rolls, #flip, #8ball, etc. The Val field depends on the Type field. Dice: []uint16 Flip: bool EightBall: string SyncWatch: TODO: SyncWatch storage type Pyu: int64 Pcount: int64

type CommandType

type CommandType uint8

CommandType are the various struct types of hash commands and their responses, such as dice rolls, #flip, #8ball, etc.

const (
	// Dice is the dice roll command type
	Dice CommandType = iota

	// Flip is the coin flip command type
	Flip

	// EightBall is the the #8ball random answer dispenser command type
	EightBall

	// SyncWatch is the synchronized timer command type for synchronizing
	// episode time during group anime watching and such
	SyncWatch

	// Pyu - don't ask
	Pyu

	// Pcount - don't ask
	Pcount
)

type ErrTooLong

type ErrTooLong string

ErrTooLong is passed, when a field exceeds the maximum string length for that specific field

func (ErrTooLong) Error

func (e ErrTooLong) Error() string

type Image

type Image struct {
	Spoiler bool `json:"spoiler,omitempty"`
	ImageCommon
	Name string `json:"name"`
}

Image contains a post's image and thumbnail data

type ImageCommon

type ImageCommon struct {
	APNG  bool `json:"apng,omitempty"`
	Audio bool `json:"audio,omitempty"`
	// Only used for file formats like OGG and MP4 that may or may not contain
	// video
	Video     bool      `json:"video,omitempty"`
	FileType  uint8     `json:"fileType"`
	ThumbType uint8     `json:"thumbType"`
	Length    uint32    `json:"length,omitempty"`
	Dims      [4]uint16 `json:"dims"`
	Size      int       `json:"size"`
	MD5       string
	SHA1      string
}

ImageCommon contains the common data shared between multiple post referencing the same image

type MessageType

type MessageType uint8

MessageType is the identifier code for websocket message types

const (
	MessageInvalid MessageType = iota
	MessageInsertThread
	MessageInsertPost
	MessageAppend
	MessageBackspace
	MessageSplice
	MessageClosePost
	MessageBacklink
	MessageInsertImage
	MessageSpoiler
	MessageDeletePost
	MessageBanned
	MessageRedirect
)

1 - 29 modify post model state

const (
	MessageSynchronise MessageType = 30 + iota
	MessageReclaim

	// Send new post ID to client
	MessagePostID

	// Concatenation of multiple websocket messages to reduce transport overhead
	MessageConcat

	// Message from the client meant to invoke no operation. Mostly used as a
	// one way ping, because the JS Websocket API does not provide access to
	// pinging.
	MessageNOOP

	// Transmit current synced IP count to client
	MessageSyncCount
)

>= 30 are miscellaneous and do not write to post models

type Post

type Post struct {
	Editing   bool        `json:"editing,omitempty"`
	Banned    bool        `json:"banned,omitempty"`
	ID        uint64      `json:"id"`
	Time      int64       `json:"time"`
	Body      string      `json:"body"`
	Name      string      `json:"name,omitempty"`
	Trip      string      `json:"trip,omitempty"`
	Auth      string      `json:"auth,omitempty"`
	Links     [][2]uint64 `json:"links,omitempty"`
	Backlinks [][2]uint64 `json:"backlinks,omitempty"`
	Commands  []Command   `json:"commands,omitempty"`
	Image     *Image      `json:"image,omitempty"`
}

Post is a generic post exposed publically through the JSON API. Either OP or reply.

type StandalonePost

type StandalonePost struct {
	Post
	OP    uint64 `json:"op"`
	Board string `json:"board"`
}

StandalonePost is a post view that includes the "op" and "board" fields, which are not exposed though Post, but are required for retrieving a post with unknown parenthood.

type Thread

type Thread struct {
	Abbrev bool `json:"abbrev,omitempty"`
	Post
	ThreadCommon
	Posts []Post `json:"posts"`
}

Thread is a transport/export wrapper that stores both the thread metadata, its opening post data and its contained posts. The composite type itself is not stored in the database.

type ThreadCommon

type ThreadCommon struct {
	Locked    bool   `json:"locked,omitempty"`
	Archived  bool   `json:"archived,omitempty"`
	Sticky    bool   `json:"sticky,omitempty"`
	PostCtr   uint32 `json:"postCtr"`
	ImageCtr  uint32 `json:"imageCtr"`
	ReplyTime int64  `json:"replyTime"`
	BumpTime  int64  `json:"bumpTime"`
	LogCtr    uint64 `json:"logCtr"`
	Subject   string `json:"subject"`
	Board     string `json:"board"`
}

ThreadCommon contains common fields of both BoardThread and Thread