Commits on Jan 4, 2022

1. - Fix failure to generate all possible combinations (backport hyperle… …

   …dger#3132)
   
   * - Fix failure to generate all possible combinations
   
   Bug happens when the endorsement policy is set to k-out-of-n where (n - k) > 1.
   For example, when there are 6 organizations and the endorsement policy is set
   to majority (i.e. 4-out-of-6). The combinations calculated by chooseKoutOfN()
   in original code are as below.
   	[0 1 2 5], [0 1 2 5], [0 1 2 5], [0 1 3 5],
   	[0 1 3 5], [0 1 4 5], [0 2 3 5], [0 2 3 5],
   	[0 2 4 5], [0 3 4 5], [1 2 3 5], [1 2 3 5],
   	[1 2 4 5], [1 3 4 5], [2 3 4 5]
   
   Obviously, the function fails to find out all the possible combinations. Some of
    the combinations are overrided by child's call. This bug would trigger below
   error sometimes when the alive peers are not within the above combinations.
   
   	[discovery] chaincodeQuery -> ERRO 13a Failed constructing descriptor for
   	chaincode chaincodes:<name:"XXXX" > ,: no peer combination can satisfy the
   	endorsement policy
   
   To fix it, the last line of choose() should be changed to pass a copy of
   "currentSubGroup" to the recursive call instead, i.e.
   
   	choose(n, targetAmount, i+1, append(make([]int, 0), currentSubGroup...), subGroups)
   
   After applying the fix, the resulting combinations generated should be corrected
   as below.
   	[0 1 2 3], [0 1 2 4], [0 1 2 5], [0 1 3 4],
   	[0 1 3 5], [0 1 4 5], [0 2 3 4], [0 2 3 5],
   	[0 2 4 5], [0 3 4 5], [1 2 3 4], [1 2 3 5],
   	[1 2 4 5], [1 3 4 5], [2 3 4 5]
   
   Signed-off-by: Tim <96273851+timtim-git@users.noreply.github.com>
   
   * - Fix failure to generate all possible combinations
   
   Bug happens when the endorsement policy is set to k-out-of-n where (n - k) > 1.
   For example, when there are 6 organizations and the endorsement policy is set
   to majority (i.e. 4-out-of-6). The combinations calculated by chooseKoutOfN()
   in original code are as below.
   	[0 1 2 5], [0 1 2 5], [0 1 2 5], [0 1 3 5],
   	[0 1 3 5], [0 1 4 5], [0 2 3 5], [0 2 3 5],
   	[0 2 4 5], [0 3 4 5], [1 2 3 5], [1 2 3 5],
   	[1 2 4 5], [1 3 4 5], [2 3 4 5]
   
   Obviously, the function fails to find out all the possible combinations. Some of
    the combinations are overrided by child's call. This bug would trigger below
   error sometimes when the alive peers are not within the above combinations.
   
   	[discovery] chaincodeQuery -> ERRO 13a Failed constructing descriptor for
   	chaincode chaincodes:<name:"XXXX" > ,: no peer combination can satisfy the
   	endorsement policy
   
   To fix it, the last line of choose() should be changed to pass a copy of
   "currentSubGroup" to the recursive call instead, i.e.
   
   	choose(n, targetAmount, i+1, append(make([]int, 0), currentSubGroup...), subGroups)
   
   After applying the fix, the resulting combinations generated should be corrected
   as below.
   	[0 1 2 3], [0 1 2 4], [0 1 2 5], [0 1 3 4],
   	[0 1 3 5], [0 1 4 5], [0 2 3 4], [0 2 3 5],
   	[0 2 4 5], [0 3 4 5], [1 2 3 4], [1 2 3 5],
   	[1 2 4 5], [1 3 4 5], [2 3 4 5]
   
   Signed-off-by: Tim <96273851+timtim-git@users.noreply.github.com>
   
   * - Update choose_test.go
   
   Signed-off-by: Tim <96273851+timtim-git@users.noreply.github.com>
   
   * - Fix build error
   
   Signed-off-by: Tim <96273851+timtim-git@users.noreply.github.com>
   Signed-off-by: David Enyeart <enyeart@us.ibm.com>

   

   timtim-git authored and denyeart committed Jan 4, 2022
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