git.giacomolli.uk - onechat/blob - tree_test.go

   1 package main
   2
   3 import (
   4         "os"
   5         "path/filepath"
   6         "strings"
   7         "testing"
   8
   9         "github.com/stretchr/testify/require"
  10 )
  11
  12 func TestFreeLeafHoldsAShortMessageWordForWord(t *testing.T) {
  13         message := Message{
  14                 ID:   7,
  15                 Kind: "user",
  16                 Text: strings.Repeat("a", nodeBytes-len("user: ")),
  17         }
  18
  19         node, free := freeLeaf(message)
  20         require.True(t, free)
  21         require.Equal(t, Node{
  22                 Level: 0,
  23                 Index: 7,
  24                 Text:  "user: " + message.Text,
  25                 Size:  nodeBytes,
  26         }, node)
  27
  28         message.Text += "a"
  29         _, free = freeLeaf(message)
  30         require.False(t, free)
  31 }
  32
  33 func TestFreeMergeJoinsShortSiblings(t *testing.T) {
  34         left := treeTestNode(1, 2, "left")
  35         right := treeTestNode(1, 3, "right")
  36
  37         node, free := freeMerge(left, right)
  38         require.True(t, free)
  39         require.Equal(t, treeTestNode(2, 1, "left\nright"), node)
  40
  41         right = treeTestNode(1, 3, strings.Repeat("r", nodeBytes-len("left")))
  42         _, free = freeMerge(left, right)
  43         require.False(t, free)
  44 }
  45
  46 func TestTreeBuildsEachNodeOnce(t *testing.T) {
  47         tree, err := openTree(t.Context(), t.TempDir(), 2, newTestClock().Now)
  48         require.NoError(t, err)
  49
  50         defer func() {
  51                 require.NoError(t, tree.Close())
  52         }()
  53
  54         require.NoError(t, tree.Add(treeTestNode(0, 0, "user: a")))
  55         require.ErrorContains(t, tree.Add(treeTestNode(0, 0, "user: b")), "already built")
  56         require.ErrorContains(t, tree.Add(treeTestNode(1, 0, "a b")), "child that is not built")
  57
  58         require.NoError(t, tree.Add(treeTestNode(0, 1, "reply: b")))
  59         require.NoError(t, tree.Add(treeTestNode(1, 0, "a b")))
  60
  61         require.Equal(t, "user: a", treeReadNode(t, tree, 0, 0).Text)
  62 }
  63
  64 func TestTreeReopenLoadsTheSameNodes(t *testing.T) {
  65         root := t.TempDir()
  66         clock := newTestClock()
  67         tree, err := openTree(t.Context(), root, 2, clock.Now)
  68         require.NoError(t, err)
  69
  70         nodes := []Node{
  71                 treeTestNode(0, 1, "reply: b"),
  72                 treeTestNode(0, 0, "user: a"),
  73                 treeTestNode(1, 0, "user: a\nreply: b"),
  74         }
  75
  76         for _, node := range nodes {
  77                 require.NoError(t, tree.Add(node))
  78         }
  79
  80         require.NoError(t, tree.Close())
  81
  82         data, err := os.ReadFile(filepath.Join(root, "tree", "2026-01-01.jsonl"))
  83         require.NoError(t, err)
  84         require.JSONEq(t, `{"l":0,"i":1,"text":"reply: b","size":8}`+"\n", strings.SplitAfter(string(data), "\n")[0])
  85
  86         tree, err = openTree(t.Context(), root, 2, clock.Now)
  87         require.NoError(t, err)
  88
  89         defer func() {
  90                 require.NoError(t, tree.Close())
  91         }()
  92
  93         require.Equal(t, len(nodes), tree.Count())
  94
  95         for _, node := range nodes {
  96                 require.Equal(t, node, treeReadNode(t, tree, node.Level, node.Index))
  97         }
  98 }
  99
 100 func TestTreeBuildsAMissingIndexAgain(t *testing.T) {
 101         root := t.TempDir()
 102         clock := newTestClock()
 103         tree, err := openTree(t.Context(), root, 2, clock.Now)
 104         require.NoError(t, err)
 105
 106         nodes := []Node{
 107                 treeTestNode(0, 1, "reply: b"),
 108                 treeTestNode(0, 0, "user: a"),
 109                 treeTestNode(1, 0, "user: a\nreply: b"),
 110         }
 111
 112         for _, node := range nodes {
 113                 require.NoError(t, tree.Add(node))
 114         }
 115
 116         require.NoError(t, tree.Close())
 117         require.NoError(t, os.RemoveAll(filepath.Join(root, "index")))
 118
 119         _, err = openTree(t.Context(), root, 1, clock.Now)
 120         require.ErrorContains(t, err, "covers messages after the log")
 121         require.NoError(t, os.RemoveAll(filepath.Join(root, "index")))
 122
 123         tree, err = openTree(t.Context(), root, 2, clock.Now)
 124         require.NoError(t, err)
 125
 126         defer func() {
 127                 require.NoError(t, tree.Close())
 128         }()
 129
 130         require.Equal(t, len(nodes), tree.Count())
 131
 132         for _, node := range nodes {
 133                 require.Equal(t, node, treeReadNode(t, tree, node.Level, node.Index))
 134         }
 135 }
 136
 137 func TestTreeIndexesTheNodesAfterACrash(t *testing.T) {
 138         root := t.TempDir()
 139         clock := newTestClock()
 140         tree, err := openTree(t.Context(), root, 2, clock.Now)
 141         require.NoError(t, err)
 142
 143         require.NoError(t, tree.Add(treeTestNode(0, 0, "user: a")))
 144         require.NoError(t, tree.Add(treeTestNode(0, 1, "reply: b")))
 145         require.NoError(t, tree.Close())
 146
 147         // A crash after the line write and in the middle of the index writes.
 148         order := filepath.Join(root, "index", "tree.idx")
 149         require.NoError(t, os.Truncate(order, treeRecordBytes+5))
 150         require.NoError(t, os.Truncate(filepath.Join(root, "index", "tree-0.idx"), positionBytes))
 151
 152         tree, err = openTree(t.Context(), root, 2, clock.Now)
 153         require.NoError(t, err)
 154
 155         defer func() {
 156                 require.NoError(t, tree.Close())
 157         }()
 158
 159         require.Equal(t, 2, tree.Count())
 160         require.Equal(t, "reply: b", treeReadNode(t, tree, 0, 1).Text)
 161         require.NoError(t, tree.Add(treeTestNode(1, 0, "user: a\nreply: b")))
 162 }