github.com/elfadel/cilium@v1.6.12/pkg/datapath/loader/hash_test.go (about)

     1  // Copyright 2019 Authors of Cilium
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // +build !privileged_tests
    16  
    17  package loader
    18  
    19  import (
    20  	"github.com/cilium/cilium/pkg/datapath"
    21  	"github.com/cilium/cilium/pkg/datapath/linux"
    22  	"github.com/cilium/cilium/pkg/testutils"
    23  
    24  	. "gopkg.in/check.v1"
    25  )
    26  
    27  var (
    28  	dummyNodeCfg = datapath.LocalNodeConfiguration{}
    29  	dummyDevCfg  = testutils.NewTestEndpoint()
    30  	dummyEPCfg   = testutils.NewTestEndpoint()
    31  )
    32  
    33  // TesthashDatapath is done in this package just for easy access to dummy
    34  // configuration objects.
    35  func (s *LoaderTestSuite) TesthashDatapath(c *C) {
    36  	dp := linux.NewDatapath(linux.DatapathConfiguration{}, nil)
    37  	h := newDatapathHash()
    38  	baseHash := h.String()
    39  
    40  	// Ensure we get different hashes when config is added
    41  	h = hashDatapath(dp, &dummyNodeCfg, &dummyDevCfg, &dummyEPCfg)
    42  	dummyHash := h.String()
    43  	c.Assert(dummyHash, Not(Equals), baseHash)
    44  
    45  	// Ensure we get the same base hash when config is removed via Reset()
    46  	h.Reset()
    47  	c.Assert(h.String(), Equals, baseHash)
    48  	c.Assert(h.String(), Not(Equals), dummyHash)
    49  
    50  	// Ensure that with a copy of the endpoint config we get the same hash
    51  	newEPCfg := dummyEPCfg
    52  	h = hashDatapath(dp, &dummyNodeCfg, &dummyDevCfg, &newEPCfg)
    53  	c.Assert(h.String(), Not(Equals), baseHash)
    54  	c.Assert(h.String(), Equals, dummyHash)
    55  
    56  	// Even with different endpoint IDs, we get the same hash
    57  	//
    58  	// This is the key to avoiding recompilation per endpoint; static
    59  	// data substitution is performed via pkg/elf instead.
    60  	newEPCfg.Id++
    61  	h = hashDatapath(dp, &dummyNodeCfg, &dummyDevCfg, &newEPCfg)
    62  	c.Assert(h.String(), Not(Equals), baseHash)
    63  	c.Assert(h.String(), Equals, dummyHash)
    64  
    65  	// But when we configure the endpoint differently, it's different
    66  	newEPCfg = testutils.NewTestEndpoint()
    67  	newEPCfg.Opts.SetBool("foo", true)
    68  	h = hashDatapath(dp, &dummyNodeCfg, &dummyDevCfg, &newEPCfg)
    69  	c.Assert(h.String(), Not(Equals), baseHash)
    70  	c.Assert(h.String(), Not(Equals), dummyHash)
    71  }