github.com/deanMdreon/kafka-go@v0.4.32/joingroup.go (about)

     1  package kafka
     2  
     3  import (
     4  	"bufio"
     5  	"bytes"
     6  )
     7  
     8  type memberGroupMetadata struct {
     9  	// MemberID assigned by the group coordinator or null if joining for the
    10  	// first time.
    11  	MemberID string
    12  	Metadata groupMetadata
    13  }
    14  
    15  type groupMetadata struct {
    16  	Version  int16
    17  	Topics   []string
    18  	UserData []byte
    19  }
    20  
    21  func (t groupMetadata) size() int32 {
    22  	return sizeofInt16(t.Version) +
    23  		sizeofStringArray(t.Topics) +
    24  		sizeofBytes(t.UserData)
    25  }
    26  
    27  func (t groupMetadata) writeTo(wb *writeBuffer) {
    28  	wb.writeInt16(t.Version)
    29  	wb.writeStringArray(t.Topics)
    30  	wb.writeBytes(t.UserData)
    31  }
    32  
    33  func (t groupMetadata) bytes() []byte {
    34  	buf := bytes.NewBuffer(nil)
    35  	t.writeTo(&writeBuffer{w: buf})
    36  	return buf.Bytes()
    37  }
    38  
    39  func (t *groupMetadata) readFrom(r *bufio.Reader, size int) (remain int, err error) {
    40  	if remain, err = readInt16(r, size, &t.Version); err != nil {
    41  		return
    42  	}
    43  	if remain, err = readStringArray(r, remain, &t.Topics); err != nil {
    44  		return
    45  	}
    46  	if remain, err = readBytes(r, remain, &t.UserData); err != nil {
    47  		return
    48  	}
    49  	return
    50  }
    51  
    52  type joinGroupRequestGroupProtocolV1 struct {
    53  	ProtocolName     string
    54  	ProtocolMetadata []byte
    55  }
    56  
    57  func (t joinGroupRequestGroupProtocolV1) size() int32 {
    58  	return sizeofString(t.ProtocolName) +
    59  		sizeofBytes(t.ProtocolMetadata)
    60  }
    61  
    62  func (t joinGroupRequestGroupProtocolV1) writeTo(wb *writeBuffer) {
    63  	wb.writeString(t.ProtocolName)
    64  	wb.writeBytes(t.ProtocolMetadata)
    65  }
    66  
    67  type joinGroupRequestV1 struct {
    68  	// GroupID holds the unique group identifier
    69  	GroupID string
    70  
    71  	// SessionTimeout holds the coordinator considers the consumer dead if it
    72  	// receives no heartbeat after this timeout in ms.
    73  	SessionTimeout int32
    74  
    75  	// RebalanceTimeout holds the maximum time that the coordinator will wait
    76  	// for each member to rejoin when rebalancing the group in ms
    77  	RebalanceTimeout int32
    78  
    79  	// MemberID assigned by the group coordinator or the zero string if joining
    80  	// for the first time.
    81  	MemberID string
    82  
    83  	// ProtocolType holds the unique name for class of protocols implemented by group
    84  	ProtocolType string
    85  
    86  	// GroupProtocols holds the list of protocols that the member supports
    87  	GroupProtocols []joinGroupRequestGroupProtocolV1
    88  }
    89  
    90  func (t joinGroupRequestV1) size() int32 {
    91  	return sizeofString(t.GroupID) +
    92  		sizeofInt32(t.SessionTimeout) +
    93  		sizeofInt32(t.RebalanceTimeout) +
    94  		sizeofString(t.MemberID) +
    95  		sizeofString(t.ProtocolType) +
    96  		sizeofArray(len(t.GroupProtocols), func(i int) int32 { return t.GroupProtocols[i].size() })
    97  }
    98  
    99  func (t joinGroupRequestV1) writeTo(wb *writeBuffer) {
   100  	wb.writeString(t.GroupID)
   101  	wb.writeInt32(t.SessionTimeout)
   102  	wb.writeInt32(t.RebalanceTimeout)
   103  	wb.writeString(t.MemberID)
   104  	wb.writeString(t.ProtocolType)
   105  	wb.writeArray(len(t.GroupProtocols), func(i int) { t.GroupProtocols[i].writeTo(wb) })
   106  }
   107  
   108  type joinGroupResponseMemberV1 struct {
   109  	// MemberID assigned by the group coordinator
   110  	MemberID       string
   111  	MemberMetadata []byte
   112  }
   113  
   114  func (t joinGroupResponseMemberV1) size() int32 {
   115  	return sizeofString(t.MemberID) +
   116  		sizeofBytes(t.MemberMetadata)
   117  }
   118  
   119  func (t joinGroupResponseMemberV1) writeTo(wb *writeBuffer) {
   120  	wb.writeString(t.MemberID)
   121  	wb.writeBytes(t.MemberMetadata)
   122  }
   123  
   124  func (t *joinGroupResponseMemberV1) readFrom(r *bufio.Reader, size int) (remain int, err error) {
   125  	if remain, err = readString(r, size, &t.MemberID); err != nil {
   126  		return
   127  	}
   128  	if remain, err = readBytes(r, remain, &t.MemberMetadata); err != nil {
   129  		return
   130  	}
   131  	return
   132  }
   133  
   134  type joinGroupResponseV1 struct {
   135  	// ErrorCode holds response error code
   136  	ErrorCode int16
   137  
   138  	// GenerationID holds the generation of the group.
   139  	GenerationID int32
   140  
   141  	// GroupProtocol holds the group protocol selected by the coordinator
   142  	GroupProtocol string
   143  
   144  	// LeaderID holds the leader of the group
   145  	LeaderID string
   146  
   147  	// MemberID assigned by the group coordinator
   148  	MemberID string
   149  	Members  []joinGroupResponseMemberV1
   150  }
   151  
   152  func (t joinGroupResponseV1) size() int32 {
   153  	return sizeofInt16(t.ErrorCode) +
   154  		sizeofInt32(t.GenerationID) +
   155  		sizeofString(t.GroupProtocol) +
   156  		sizeofString(t.LeaderID) +
   157  		sizeofString(t.MemberID) +
   158  		sizeofArray(len(t.MemberID), func(i int) int32 { return t.Members[i].size() })
   159  }
   160  
   161  func (t joinGroupResponseV1) writeTo(wb *writeBuffer) {
   162  	wb.writeInt16(t.ErrorCode)
   163  	wb.writeInt32(t.GenerationID)
   164  	wb.writeString(t.GroupProtocol)
   165  	wb.writeString(t.LeaderID)
   166  	wb.writeString(t.MemberID)
   167  	wb.writeArray(len(t.Members), func(i int) { t.Members[i].writeTo(wb) })
   168  }
   169  
   170  func (t *joinGroupResponseV1) readFrom(r *bufio.Reader, size int) (remain int, err error) {
   171  	if remain, err = readInt16(r, size, &t.ErrorCode); err != nil {
   172  		return
   173  	}
   174  	if remain, err = readInt32(r, remain, &t.GenerationID); err != nil {
   175  		return
   176  	}
   177  	if remain, err = readString(r, remain, &t.GroupProtocol); err != nil {
   178  		return
   179  	}
   180  	if remain, err = readString(r, remain, &t.LeaderID); err != nil {
   181  		return
   182  	}
   183  	if remain, err = readString(r, remain, &t.MemberID); err != nil {
   184  		return
   185  	}
   186  
   187  	fn := func(r *bufio.Reader, size int) (fnRemain int, fnErr error) {
   188  		var item joinGroupResponseMemberV1
   189  		if fnRemain, fnErr = (&item).readFrom(r, size); fnErr != nil {
   190  			return
   191  		}
   192  		t.Members = append(t.Members, item)
   193  		return
   194  	}
   195  	if remain, err = readArrayWith(r, remain, fn); err != nil {
   196  		return
   197  	}
   198  
   199  	return
   200  }