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350 lines
11 KiB
350 lines
11 KiB
// Package gomemcached is binary protocol packet formats and constants.
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package gomemcached
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import (
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"fmt"
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)
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const (
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REQ_MAGIC = 0x80
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RES_MAGIC = 0x81
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FLEX_MAGIC = 0x08
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FLEX_RES_MAGIC = 0x18
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)
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// CommandCode for memcached packets.
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type CommandCode uint8
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const (
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GET = CommandCode(0x00)
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SET = CommandCode(0x01)
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ADD = CommandCode(0x02)
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REPLACE = CommandCode(0x03)
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DELETE = CommandCode(0x04)
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INCREMENT = CommandCode(0x05)
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DECREMENT = CommandCode(0x06)
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QUIT = CommandCode(0x07)
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FLUSH = CommandCode(0x08)
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GETQ = CommandCode(0x09)
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NOOP = CommandCode(0x0a)
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VERSION = CommandCode(0x0b)
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GETK = CommandCode(0x0c)
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GETKQ = CommandCode(0x0d)
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APPEND = CommandCode(0x0e)
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PREPEND = CommandCode(0x0f)
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STAT = CommandCode(0x10)
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SETQ = CommandCode(0x11)
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ADDQ = CommandCode(0x12)
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REPLACEQ = CommandCode(0x13)
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DELETEQ = CommandCode(0x14)
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INCREMENTQ = CommandCode(0x15)
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DECREMENTQ = CommandCode(0x16)
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QUITQ = CommandCode(0x17)
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FLUSHQ = CommandCode(0x18)
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APPENDQ = CommandCode(0x19)
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AUDIT = CommandCode(0x27)
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PREPENDQ = CommandCode(0x1a)
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GAT = CommandCode(0x1d)
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HELLO = CommandCode(0x1f)
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RGET = CommandCode(0x30)
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RSET = CommandCode(0x31)
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RSETQ = CommandCode(0x32)
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RAPPEND = CommandCode(0x33)
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RAPPENDQ = CommandCode(0x34)
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RPREPEND = CommandCode(0x35)
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RPREPENDQ = CommandCode(0x36)
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RDELETE = CommandCode(0x37)
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RDELETEQ = CommandCode(0x38)
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RINCR = CommandCode(0x39)
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RINCRQ = CommandCode(0x3a)
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RDECR = CommandCode(0x3b)
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RDECRQ = CommandCode(0x3c)
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SASL_LIST_MECHS = CommandCode(0x20)
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SASL_AUTH = CommandCode(0x21)
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SASL_STEP = CommandCode(0x22)
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SET_VBUCKET = CommandCode(0x3d)
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TAP_CONNECT = CommandCode(0x40) // Client-sent request to initiate Tap feed
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TAP_MUTATION = CommandCode(0x41) // Notification of a SET/ADD/REPLACE/etc. on the server
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TAP_DELETE = CommandCode(0x42) // Notification of a DELETE on the server
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TAP_FLUSH = CommandCode(0x43) // Replicates a flush_all command
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TAP_OPAQUE = CommandCode(0x44) // Opaque control data from the engine
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TAP_VBUCKET_SET = CommandCode(0x45) // Sets state of vbucket in receiver (used in takeover)
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TAP_CHECKPOINT_START = CommandCode(0x46) // Notifies start of new checkpoint
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TAP_CHECKPOINT_END = CommandCode(0x47) // Notifies end of checkpoint
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UPR_OPEN = CommandCode(0x50) // Open a UPR connection with a name
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UPR_ADDSTREAM = CommandCode(0x51) // Sent by ebucketMigrator to UPR Consumer
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UPR_CLOSESTREAM = CommandCode(0x52) // Sent by eBucketMigrator to UPR Consumer
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UPR_FAILOVERLOG = CommandCode(0x54) // Request failover logs
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UPR_STREAMREQ = CommandCode(0x53) // Stream request from consumer to producer
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UPR_STREAMEND = CommandCode(0x55) // Sent by producer when it has no more messages to stream
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UPR_SNAPSHOT = CommandCode(0x56) // Start of a new snapshot
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UPR_MUTATION = CommandCode(0x57) // Key mutation
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UPR_DELETION = CommandCode(0x58) // Key deletion
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UPR_EXPIRATION = CommandCode(0x59) // Key expiration
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UPR_FLUSH = CommandCode(0x5a) // Delete all the data for a vbucket
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UPR_NOOP = CommandCode(0x5c) // UPR NOOP
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UPR_BUFFERACK = CommandCode(0x5d) // UPR Buffer Acknowledgement
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UPR_CONTROL = CommandCode(0x5e) // Set flow control params
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SELECT_BUCKET = CommandCode(0x89) // Select bucket
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OBSERVE_SEQNO = CommandCode(0x91) // Sequence Number based Observe
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OBSERVE = CommandCode(0x92)
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GET_META = CommandCode(0xA0) // Get meta. returns with expiry, flags, cas etc
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GET_COLLECTIONS_MANIFEST = CommandCode(0xba) // Get entire collections manifest.
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COLLECTIONS_GET_CID = CommandCode(0xbb) // Get collection id.
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SUBDOC_GET = CommandCode(0xc5) // Get subdoc. Returns with xattrs
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SUBDOC_MULTI_LOOKUP = CommandCode(0xd0) // Multi lookup. Doc xattrs and meta.
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DCP_SYSTEM_EVENT = CommandCode(0x5f) // A system event has occurred
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)
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// command codes that are counted toward DCP control buffer
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// when DCP clients receive DCP messages with these command codes, they need to provide acknowledgement
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var BufferedCommandCodeMap = map[CommandCode]bool{
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SET_VBUCKET: true,
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UPR_STREAMEND: true,
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UPR_SNAPSHOT: true,
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UPR_MUTATION: true,
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UPR_DELETION: true,
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UPR_EXPIRATION: true}
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// Status field for memcached response.
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type Status uint16
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// Matches with protocol_binary.h as source of truth
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const (
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SUCCESS = Status(0x00)
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KEY_ENOENT = Status(0x01)
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KEY_EEXISTS = Status(0x02)
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E2BIG = Status(0x03)
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EINVAL = Status(0x04)
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NOT_STORED = Status(0x05)
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DELTA_BADVAL = Status(0x06)
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NOT_MY_VBUCKET = Status(0x07)
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NO_BUCKET = Status(0x08)
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LOCKED = Status(0x09)
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AUTH_STALE = Status(0x1f)
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AUTH_ERROR = Status(0x20)
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AUTH_CONTINUE = Status(0x21)
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ERANGE = Status(0x22)
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ROLLBACK = Status(0x23)
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EACCESS = Status(0x24)
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NOT_INITIALIZED = Status(0x25)
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UNKNOWN_COMMAND = Status(0x81)
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ENOMEM = Status(0x82)
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NOT_SUPPORTED = Status(0x83)
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EINTERNAL = Status(0x84)
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EBUSY = Status(0x85)
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TMPFAIL = Status(0x86)
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UNKNOWN_COLLECTION = Status(0x88)
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SYNC_WRITE_IN_PROGRESS = Status(0xa2)
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SYNC_WRITE_AMBIGUOUS = Status(0xa3)
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// SUBDOC
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SUBDOC_PATH_NOT_FOUND = Status(0xc0)
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SUBDOC_BAD_MULTI = Status(0xcc)
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SUBDOC_MULTI_PATH_FAILURE_DELETED = Status(0xd3)
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)
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// for log redaction
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const (
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UdTagBegin = "<ud>"
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UdTagEnd = "</ud>"
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)
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var isFatal = map[Status]bool{
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DELTA_BADVAL: true,
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NO_BUCKET: true,
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AUTH_STALE: true,
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AUTH_ERROR: true,
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ERANGE: true,
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ROLLBACK: true,
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EACCESS: true,
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ENOMEM: true,
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NOT_SUPPORTED: true,
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}
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// the producer/consumer bit in dcp flags
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var DCP_PRODUCER uint32 = 0x01
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// the include XATTRS bit in dcp flags
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var DCP_OPEN_INCLUDE_XATTRS uint32 = 0x04
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// the include deletion time bit in dcp flags
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var DCP_OPEN_INCLUDE_DELETE_TIMES uint32 = 0x20
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// Datatype to Include XATTRS in SUBDOC GET
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var SUBDOC_FLAG_XATTR uint8 = 0x04
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// MCItem is an internal representation of an item.
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type MCItem struct {
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Cas uint64
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Flags, Expiration uint32
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Data []byte
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}
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// Number of bytes in a binary protocol header.
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const HDR_LEN = 24
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// Mapping of CommandCode -> name of command (not exhaustive)
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var CommandNames map[CommandCode]string
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// StatusNames human readable names for memcached response.
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var StatusNames map[Status]string
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func init() {
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CommandNames = make(map[CommandCode]string)
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CommandNames[GET] = "GET"
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CommandNames[SET] = "SET"
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CommandNames[ADD] = "ADD"
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CommandNames[REPLACE] = "REPLACE"
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CommandNames[DELETE] = "DELETE"
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CommandNames[INCREMENT] = "INCREMENT"
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CommandNames[DECREMENT] = "DECREMENT"
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CommandNames[QUIT] = "QUIT"
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CommandNames[FLUSH] = "FLUSH"
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CommandNames[GETQ] = "GETQ"
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CommandNames[NOOP] = "NOOP"
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CommandNames[VERSION] = "VERSION"
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CommandNames[GETK] = "GETK"
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CommandNames[GETKQ] = "GETKQ"
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CommandNames[APPEND] = "APPEND"
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CommandNames[PREPEND] = "PREPEND"
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CommandNames[STAT] = "STAT"
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CommandNames[SETQ] = "SETQ"
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CommandNames[ADDQ] = "ADDQ"
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CommandNames[REPLACEQ] = "REPLACEQ"
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CommandNames[DELETEQ] = "DELETEQ"
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CommandNames[INCREMENTQ] = "INCREMENTQ"
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CommandNames[DECREMENTQ] = "DECREMENTQ"
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CommandNames[QUITQ] = "QUITQ"
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CommandNames[FLUSHQ] = "FLUSHQ"
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CommandNames[APPENDQ] = "APPENDQ"
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CommandNames[PREPENDQ] = "PREPENDQ"
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CommandNames[RGET] = "RGET"
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CommandNames[RSET] = "RSET"
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CommandNames[RSETQ] = "RSETQ"
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CommandNames[RAPPEND] = "RAPPEND"
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CommandNames[RAPPENDQ] = "RAPPENDQ"
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CommandNames[RPREPEND] = "RPREPEND"
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CommandNames[RPREPENDQ] = "RPREPENDQ"
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CommandNames[RDELETE] = "RDELETE"
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CommandNames[RDELETEQ] = "RDELETEQ"
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CommandNames[RINCR] = "RINCR"
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CommandNames[RINCRQ] = "RINCRQ"
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CommandNames[RDECR] = "RDECR"
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CommandNames[RDECRQ] = "RDECRQ"
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CommandNames[SASL_LIST_MECHS] = "SASL_LIST_MECHS"
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CommandNames[SASL_AUTH] = "SASL_AUTH"
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CommandNames[SASL_STEP] = "SASL_STEP"
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CommandNames[TAP_CONNECT] = "TAP_CONNECT"
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CommandNames[TAP_MUTATION] = "TAP_MUTATION"
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CommandNames[TAP_DELETE] = "TAP_DELETE"
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CommandNames[TAP_FLUSH] = "TAP_FLUSH"
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CommandNames[TAP_OPAQUE] = "TAP_OPAQUE"
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CommandNames[TAP_VBUCKET_SET] = "TAP_VBUCKET_SET"
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CommandNames[TAP_CHECKPOINT_START] = "TAP_CHECKPOINT_START"
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CommandNames[TAP_CHECKPOINT_END] = "TAP_CHECKPOINT_END"
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CommandNames[UPR_OPEN] = "UPR_OPEN"
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CommandNames[UPR_ADDSTREAM] = "UPR_ADDSTREAM"
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CommandNames[UPR_CLOSESTREAM] = "UPR_CLOSESTREAM"
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CommandNames[UPR_FAILOVERLOG] = "UPR_FAILOVERLOG"
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CommandNames[UPR_STREAMREQ] = "UPR_STREAMREQ"
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CommandNames[UPR_STREAMEND] = "UPR_STREAMEND"
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CommandNames[UPR_SNAPSHOT] = "UPR_SNAPSHOT"
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CommandNames[UPR_MUTATION] = "UPR_MUTATION"
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CommandNames[UPR_DELETION] = "UPR_DELETION"
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CommandNames[UPR_EXPIRATION] = "UPR_EXPIRATION"
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CommandNames[UPR_FLUSH] = "UPR_FLUSH"
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CommandNames[UPR_NOOP] = "UPR_NOOP"
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CommandNames[UPR_BUFFERACK] = "UPR_BUFFERACK"
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CommandNames[UPR_CONTROL] = "UPR_CONTROL"
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CommandNames[SUBDOC_GET] = "SUBDOC_GET"
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CommandNames[SUBDOC_MULTI_LOOKUP] = "SUBDOC_MULTI_LOOKUP"
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CommandNames[GET_COLLECTIONS_MANIFEST] = "GET_COLLECTIONS_MANIFEST"
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CommandNames[COLLECTIONS_GET_CID] = "COLLECTIONS_GET_CID"
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StatusNames = make(map[Status]string)
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StatusNames[SUCCESS] = "SUCCESS"
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StatusNames[KEY_ENOENT] = "KEY_ENOENT"
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StatusNames[KEY_EEXISTS] = "KEY_EEXISTS"
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StatusNames[E2BIG] = "E2BIG"
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StatusNames[EINVAL] = "EINVAL"
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StatusNames[NOT_STORED] = "NOT_STORED"
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StatusNames[DELTA_BADVAL] = "DELTA_BADVAL"
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StatusNames[NOT_MY_VBUCKET] = "NOT_MY_VBUCKET"
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StatusNames[NO_BUCKET] = "NO_BUCKET"
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StatusNames[AUTH_STALE] = "AUTH_STALE"
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StatusNames[AUTH_ERROR] = "AUTH_ERROR"
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StatusNames[AUTH_CONTINUE] = "AUTH_CONTINUE"
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StatusNames[ERANGE] = "ERANGE"
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StatusNames[ROLLBACK] = "ROLLBACK"
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StatusNames[EACCESS] = "EACCESS"
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StatusNames[NOT_INITIALIZED] = "NOT_INITIALIZED"
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StatusNames[UNKNOWN_COMMAND] = "UNKNOWN_COMMAND"
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StatusNames[ENOMEM] = "ENOMEM"
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StatusNames[NOT_SUPPORTED] = "NOT_SUPPORTED"
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StatusNames[EINTERNAL] = "EINTERNAL"
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StatusNames[EBUSY] = "EBUSY"
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StatusNames[TMPFAIL] = "TMPFAIL"
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StatusNames[UNKNOWN_COLLECTION] = "UNKNOWN_COLLECTION"
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StatusNames[SUBDOC_PATH_NOT_FOUND] = "SUBDOC_PATH_NOT_FOUND"
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StatusNames[SUBDOC_BAD_MULTI] = "SUBDOC_BAD_MULTI"
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}
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// String an op code.
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func (o CommandCode) String() (rv string) {
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rv = CommandNames[o]
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if rv == "" {
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rv = fmt.Sprintf("0x%02x", int(o))
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}
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return rv
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}
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// String an op code.
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func (s Status) String() (rv string) {
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rv = StatusNames[s]
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if rv == "" {
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rv = fmt.Sprintf("0x%02x", int(s))
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}
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return rv
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}
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// IsQuiet will return true if a command is a "quiet" command.
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func (o CommandCode) IsQuiet() bool {
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switch o {
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case GETQ,
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GETKQ,
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SETQ,
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ADDQ,
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REPLACEQ,
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DELETEQ,
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INCREMENTQ,
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DECREMENTQ,
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QUITQ,
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FLUSHQ,
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APPENDQ,
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PREPENDQ,
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RSETQ,
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RAPPENDQ,
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RPREPENDQ,
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RDELETEQ,
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RINCRQ,
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RDECRQ:
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return true
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}
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return false
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}
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