| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package functions |
| 4 | |
| 5 | import ( |
| 6 | "testing" |
| 7 | |
| 8 | "github.com/stretchr/testify/assert" |
| 9 | "github.com/stretchr/testify/require" |
| 10 | ) |
| 11 | |
| 12 | func TestLookupFunction_SnapshotScenarios(t *testing.T) { |
| 13 | tests := map[string]struct { |
| 14 | run func(t *testing.T, mgr *Manager) |
| 15 | }{ |
| 16 | "uses direct snapshot": { |
| 17 | run: func(t *testing.T, mgr *Manager) { |
| 18 | called := make(chan struct{}, 1) |
| 19 | mgr.Register("fn", func(Function) { called <- struct{}{} }) |
| 20 | |
| 21 | handler, ok := mgr.lookupFunction("fn") |
| 22 | require.True(t, ok) |
| 23 | |
| 24 | mgr.Unregister("fn") |
| 25 | handler(Function{Name: "fn"}) |
| 26 | |
| 27 | select { |
| 28 | case <-called: |
| 29 | default: |
| 30 | t.Fatal("snapshot handler should still invoke the originally resolved direct function") |
| 31 | } |
| 32 | }, |
| 33 | }, |
| 34 | "uses prefix snapshot": { |
| 35 | run: func(t *testing.T, mgr *Manager) { |
| 36 | called := make(chan struct{}, 1) |
| 37 | mgr.RegisterPrefix("config", "collector:", func(Function) { called <- struct{}{} }) |
| 38 | |
| 39 | handler, ok := mgr.lookupFunction("config") |
| 40 | require.True(t, ok) |
| 41 | |
| 42 | mgr.UnregisterPrefix("config", "collector:") |
| 43 | handler(Function{Name: "config", Args: []string{"collector:job"}}) |
| 44 | |
| 45 | select { |
| 46 | case <-called: |
| 47 | default: |
| 48 | t.Fatal("snapshot handler should still route using the prefix set captured at lookup time") |
| 49 | } |
| 50 | }, |
| 51 | }, |
| 52 | "overlapping prefix registration is rejected": { |
| 53 | run: func(t *testing.T, mgr *Manager) { |
| 54 | longHits := 0 |
| 55 | shortHits := 0 |
| 56 | |
| 57 | mgr.RegisterPrefix("config", "collector:", func(Function) { shortHits++ }) |
| 58 | mgr.RegisterPrefix("config", "collector:job:", func(Function) { longHits++ }) |
| 59 | |
| 60 | require.NotNil(t, mgr.functionRegistry["config"]) |
| 61 | require.Len(t, mgr.functionRegistry["config"].prefixes, 1) |
| 62 | _, longRegistered := mgr.functionRegistry["config"].prefixes["collector:job:"] |
| 63 | assert.False(t, longRegistered) |
| 64 | |
| 65 | handler, ok := mgr.lookupFunction("config") |
| 66 | require.True(t, ok) |
| 67 | |
| 68 | handler(Function{Name: "config", Args: []string{"collector:job:alpha"}}) |
| 69 | assert.Equal(t, 0, longHits) |
| 70 | assert.Equal(t, 1, shortHits) |
| 71 | }, |
| 72 | }, |
| 73 | } |
| 74 | |
| 75 | for name, tc := range tests { |
| 76 | t.Run(name, func(t *testing.T) { |
| 77 | tc.run(t, NewManager()) |
| 78 | }) |
| 79 | } |
| 80 | } |