Commits on Sep 5, 2024

1. introducing Map.Drain API to traverse a map while also deleting entries …

   This commit introduces the `Map.Drain` API to traverse the map while also
   removing its entries. It leverages the same `MapIterator` structure, with
   the introduction of a new unexported method to handle the map draining.
   The tests make sure that the behavior is as expected, and that this API
   returns an error while invoked on the wrong map, such as arrays, for which
   `Map.Iterate` should be used instead.
   The `LookupAndDelete` system call support has been introduced in:
   
   1. 5.14 for BPF_MAP_TYPE_HASH, BPF_MAP_TYPE_PERCPU_HASH, BPF_MAP_TYPE_LRU_HASH and BPF_MAP_TYPE_LRU_PERCPU_HASH.
   2. 4.20 for BPF_MAP_TYPE_QUEUE, BPF_MAP_TYPE_STACK
   
   Do not expect the `Map.Drain` API to work on prior versions, according
   to the target map type. From the user perspective, the usage should
   be similar to `Map.Iterate`, as shown as follows:
   
   ```go
   m, err := NewMap(&MapSpec{
   	Type:       Hash,
   	KeySize:    4,
   	ValueSize:  8,
   	MaxEntries: 10,
   })
   // populate here the map and defer close
   it := m.Drain()
   for it.Next(keyPtr, &value) {
       // here the entry doesn't exist anymore in the underlying map.
       ...
   }
   ```
   
   Signed-off-by: Simone Magnani <simone.magnani@isovalent.com>

   

   smagnani96 committed Sep 5, 2024
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