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136 lines
4.5 KiB
Plaintext
136 lines
4.5 KiB
Plaintext
sequenceDiagram
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participant M as Existing<br>member (M)
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participant MA as Existing<br>member<br>agent (MA)
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participant A as Alice (A)
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participant AA as Alice's<br>agent (AA)
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participant BA as Bob's<br>agent (BA)
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participant B as Bob (B)
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note over A, AA: 1. create new group (no members)
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A ->> AA: G:gidA? NEW<br>(gidA - group ID of this group for A,<br>can be generated by the agent)
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note over AA: create "internal" broadcast associated with the group<br>(B: NEW)
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AA ->> A: G:gidA OK
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note over A, BA: 2. add Bob to group
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A ->> AA: C:idAB INTRO G:gidA gInfo<br>(idAB - conn alias A has for B)
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note over AA: generate new random ID for member B (midB, unique per group)<br>initiate "internal" connection gidAB for B in group<br>(internal means that it is not visible to the clients<br>and cannot be used with client commands)
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AA ->> BA: via idAB: GROUP C:midB g:gInvAB gInfo
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BA ->> B: C:idBA REQ G:invID gInfo<br>(invID - to refer to it in ACPT)
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B ->> BA: G:gidB? ACPT G:invID<br>(RJCT G:invID could be added)
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note over BA: create group and "internal" broadcast associated with the group<br>(B: NEW)
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BA ->> B: G:gidB OK
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BA ->> AA: establish internal connection gidBA (using g:gInvAB) for A in group
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note over BA, AA: add connections gidBA and gidAB to broadcasts<br>(B: ADD)
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AA ->> A: G:gidA CON C:idAB
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BA ->> B: G:gidA CON C:idBA
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note over M, B: For each existing member M:<br>create and accept internal introduction between connections, related to the group, via gidAB/BA/AM/MA, connections created are gidBM and gidMB<br>The fact that the introduction arrives via connection allocated for the group, allows agents identify it as a new group member, ID used in introductions is group-scoped member ID.
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note over A, BA: once all members were sent to B
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AA ->> BA: via gidAB: MEM C:midB
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note over BA, B: once all members are connected
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BA ->> B: G:gidB MEM
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note over A, AA: once all members reported connection
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AA ->> A: G:gidA MEM C:idAB
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note over M, AA: for each member M
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AA ->> MA: via gidAM: MEM C:midB
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MA ->> M: G:gidM MEM C:idMB
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note over M, B: 3. B sends message to the group
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B ->> BA: G:gidB SEND msg
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note over BA: send message via associated broadcast and respond to client with SENT notifications
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BA ->> B: G:gidB SENT C:idBA intMsgID
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BA ->> B: G:gidB SENT C:idBM intMsgID
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note over BA, B: once sent to all
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BA ->> B: G:gidB SENT intMsgID
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AA ->> A: G:gidA MSG C:idAB intMsgID msgdata
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A ->> AA: G:gidA ACK intMsgID
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AA ->> BA: via gidAB: RCVD extMsgID hash sig
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BA ->> B: G:gidA RCVD C:idBA intMsgID status<br>(status - message integrity check)
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MA ->> M: G:gidM MSG C:idMB intMsgID msgdata
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M ->> MA: G:gidM ACK intMsgID
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MA ->> BA: via gidMB: RCVD extMsgID hash sig
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BA ->> B: G:gidM RCVD C:idBM intMsgID status
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note over BA, B: once received by all
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BA ->> B: G:gidM RCVD intMsgID status
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note over M, B: 4a. A leaves group
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A ->> AA: G:gidA LEAVE
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AA ->> A: G:gidA OK
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AA ->> BA: via gidAB: LEFT
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note over AA: remove gidAB, remove from broadcast
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note over BA: remove gidBA, remove from broadcast
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BA ->> B: G:gidB LEFT C:idBA
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AA ->> MA: via gidAM: LEFT
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note over AA: remove gidAM, remove from broadcast
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note over MA: remove gidMA, remove from broadcast
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MA ->> M: G:gidM LEFT C:idMA
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AA ->> A: G:gidA LEFT
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note over B, BA: if all members left
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BA ->> B: G:gidB: EMPTY
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note over M, B: 4b. A removes B from group
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A ->> AA: G:gidA REM C:idAB
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AA ->> A: G:gidA OK
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AA ->> BA: via gidAB: OUT
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note over BA: remove gidBA, all gidBM
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BA ->> B: G:gidB OUT C:idBA
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note over AA: remove gidAB
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AA ->> A: G:gidA OK
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note over M, B: below steps happen for each existing member M
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AA ->> MA: via gidAM: REM C:midB
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note over MA: remove gidMB
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MA ->> AA: via gidMA: REMD C:midB
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MA ->> M: G:gidM REMD C:idMB C:idMA<br>(B removed by A)
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note over A, AA: once all members removed B
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AA ->> A: G:gidA REMD C:idAB<br>(B removed by this agent)
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note over M, B: 4c. A deletes group
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A ->> AA: G:gidA DEL
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AA ->> A: G:gidA OK
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AA ->> BA: via gidAB: DEL
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note over BA: remove all group connections and messages
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BA ->> B: G:gidB DELD C:idBA<br>(group deleted by A)
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BA ->> AA: via gidBA: DELD
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AA ->> A: G:gidA DELD C:idAB
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AA ->> MA: via gidAM: DEL
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note over MA: remove all group connections and messages
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MA ->> M: G:gidM DELD C:idMA<br>(group deleted by A)
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MA ->> AA: via gidMA: DELD
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AA ->> A: G:gidA DELD C:idAM
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AA ->> A: G:gidA DELD<br>(group deleted by this agent - all confirmed)
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