| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "crypto/sha256" |
| 6 | "database/sql" |
| 7 | "encoding/base64" |
| 8 | "encoding/json" |
| 9 | "errors" |
| 10 | "fmt" |
| 11 | "path/filepath" |
| 12 | "strings" |
| 13 | "unicode/utf8" |
| 14 | |
| 15 | "reasonix/internal/config" |
| 16 | "reasonix/internal/projectiondb" |
| 17 | "reasonix/internal/session" |
| 18 | ) |
| 19 | |
| 20 | // The native preparation owns both databases. Search is admitted only after |
| 21 | // an explicit request and joins that owner's retirement barrier before close. |
| 22 | type nativeHistorySearch struct { |
| 23 | done chan struct{} |
| 24 | db *sql.DB |
| 25 | err error |
| 26 | } |
| 27 | |
| 28 | func (p *nativeHistoryPreparation) closeSearch() { |
| 29 | p.searchMu.Lock() |
| 30 | search := p.search |
| 31 | p.searchMu.Unlock() |
| 32 | if search != nil { |
| 33 | <-search.done |
| 34 | if search.db != nil { |
| 35 | _ = search.db.Close() |
| 36 | } |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | func (a *App) prepareNativeHistorySearch(p *nativeHistoryPreparation) *nativeHistorySearch { |
| 41 | p.searchMu.Lock() |
| 42 | defer p.searchMu.Unlock() |
| 43 | if p.search != nil { |
| 44 | return p.search |
| 45 | } |
| 46 | search := &nativeHistorySearch{done: make(chan struct{})} |
| 47 | if err := p.ctx.Err(); err != nil { |
| 48 | search.err = err |
| 49 | close(search.done) |
| 50 | return search |
| 51 | } |
| 52 | p.search = search |
| 53 | go func() { |
| 54 | defer close(search.done) |
| 55 | release, err := a.historyMaintenance.Foreground(p.ctx) |
| 56 | if err != nil { |
| 57 | search.err = err |
| 58 | return |
| 59 | } |
| 60 | defer release() |
| 61 | search.db, search.err = openNativeSearch(p) |
| 62 | }() |
| 63 | return search |
| 64 | } |
| 65 | |
| 66 | type nativeSearchCursor struct { |
| 67 | Version int `json:"v"` |
| 68 | Generation string `json:"g"` |
| 69 | Query string `json:"q"` |
| 70 | Before int64 `json:"b"` |
| 71 | } |
| 72 | |
| 73 | func (a *App) searchNativeHistory(r *desktopHistoryReader, text, cursor string, limit int) (session.SearchHistoryPage, error) { |
| 74 | page := session.SearchHistoryPage{Hits: []session.SearchHistoryHit{}, Status: "failed"} |
| 75 | text = strings.TrimSpace(text) |
| 76 | if text == "" { |
| 77 | return page, errors.New("history search query is required") |
| 78 | } |
| 79 | p, err := nativeNavigationPager(r) |
| 80 | if err != nil { |
| 81 | page.Status = nativeNavigationStatus(r, err) |
| 82 | if page.Status != "failed" { |
| 83 | err = nil |
| 84 | } |
| 85 | return page, err |
| 86 | } |
| 87 | page.SnapshotSequence, page.CoverageSequence = nativeHistorySequence(p), nativeHistorySequence(p) |
| 88 | before := int64(p.Header.MessageCount) |
| 89 | digest := fmt.Sprintf("%x", sha256.Sum256([]byte(text))) |
| 90 | if cursor != "" { |
| 91 | var cut nativeSearchCursor |
| 92 | body, err := base64.RawURLEncoding.DecodeString(cursor) |
| 93 | if err != nil || json.Unmarshal(body, &cut) != nil || cut.Version != 1 || cut.Generation != r.native.key || cut.Query != digest || cut.Before <= 0 || cut.Before > before { |
| 94 | page.Status = "stale_cursor" |
| 95 | return page, nil |
| 96 | } |
| 97 | before = cut.Before |
| 98 | } |
| 99 | search := a.prepareNativeHistorySearch(r.native) |
| 100 | select { |
| 101 | case <-search.done: |
| 102 | if search.err != nil { |
| 103 | return page, search.err |
| 104 | } |
| 105 | default: |
| 106 | page.Status, page.CoverageSequence = "preparing", 0 |
| 107 | return page, nil |
| 108 | } |
| 109 | if limit <= 0 { |
| 110 | limit = 50 |
| 111 | } |
| 112 | limit = min(limit, 200) |
| 113 | var rows *sql.Rows |
| 114 | if utf8.RuneCountInString(text) >= 3 { |
| 115 | match := `"` + strings.ReplaceAll(text, `"`, `""`) + `"` |
| 116 | rows, err = search.db.QueryContext(r.ctx, `SELECT d.position,d.role,d.preview FROM documents_fts JOIN documents d ON d.position=documents_fts.rowid WHERE documents_fts MATCH ? AND instr(d.text,?)>0 AND d.position<? ORDER BY d.position DESC LIMIT ?`, match, text, before, limit+1) |
| 117 | } else { |
| 118 | rows, err = search.db.QueryContext(r.ctx, `SELECT position,role,preview FROM documents WHERE instr(text,?)>0 AND position<? ORDER BY position DESC LIMIT ?`, text, before, limit+1) |
| 119 | } |
| 120 | if err != nil { |
| 121 | return page, err |
| 122 | } |
| 123 | defer rows.Close() |
| 124 | for rows.Next() { |
| 125 | var hit session.SearchHistoryHit |
| 126 | if err := rows.Scan(&hit.Position, &hit.Role, &hit.Preview); err != nil { |
| 127 | return page, err |
| 128 | } |
| 129 | if len(page.Hits) == limit { |
| 130 | page.HasMore = true |
| 131 | break |
| 132 | } |
| 133 | hit.MessageID, hit.EventSequence = nativeHistoryEntryID(r, p, int(hit.Position)), page.SnapshotSequence |
| 134 | page.Hits = append(page.Hits, hit) |
| 135 | } |
| 136 | if err := rows.Err(); err != nil { |
| 137 | return page, err |
| 138 | } |
| 139 | if err := p.Validate(); err != nil { |
| 140 | return page, err |
| 141 | } |
| 142 | if page.HasMore { |
| 143 | body, err := json.Marshal(nativeSearchCursor{Version: 1, Generation: r.native.key, Query: digest, Before: page.Hits[len(page.Hits)-1].Position}) |
| 144 | if err != nil { |
| 145 | return page, err |
| 146 | } |
| 147 | page.NextCursor = base64.RawURLEncoding.EncodeToString(body) |
| 148 | } |
| 149 | page.Status = "ready" |
| 150 | return page, nil |
| 151 | } |
| 152 | |
| 153 | var nativeSearchMigrations = []projectiondb.Migration{{Version: 1, Apply: func(ctx context.Context, tx *sql.Tx) error { |
| 154 | _, err := tx.ExecContext(ctx, `CREATE TABLE metadata(key TEXT PRIMARY KEY,value TEXT NOT NULL); |
| 155 | CREATE TABLE documents(position INTEGER PRIMARY KEY,role TEXT NOT NULL,preview TEXT NOT NULL,text TEXT NOT NULL); |
| 156 | CREATE VIRTUAL TABLE documents_fts USING fts5(text,content='documents',content_rowid='position',tokenize='trigram');`) |
| 157 | return err |
| 158 | }}} |
| 159 | |
| 160 | func openNativeSearch(p *nativeHistoryPreparation) (*sql.DB, error) { |
| 161 | root := config.CacheDir() |
| 162 | if root == "" { |
| 163 | return nil, errors.New("history cache unavailable") |
| 164 | } |
| 165 | // This versioned cache is disposable and never writes into the source's |
| 166 | // session directory. Older readers can ignore it without a migration. |
| 167 | opts := projectiondb.OpenOptions{Path: filepath.Join(root, "history-search-v1", p.cacheKey+".sqlite"), Migrations: nativeSearchMigrations, RequireDisk: true, MaxOpenConns: 1} |
| 168 | if handle, err := projectiondb.Open(p.ctx, opts); err == nil { |
| 169 | var generation string |
| 170 | err = handle.DB.QueryRowContext(p.ctx, `SELECT value FROM metadata WHERE key='complete'`).Scan(&generation) |
| 171 | if err == nil && generation == p.key { |
| 172 | if err := p.pager.Validate(); err == nil { |
| 173 | return handle.DB, nil |
| 174 | } |
| 175 | } |
| 176 | _ = handle.DB.Close() |
| 177 | } |
| 178 | if err := projectiondb.Rebuild(p.ctx, opts, func(ctx context.Context, db *sql.DB) error { |
| 179 | return buildNativeSearch(ctx, db, p) |
| 180 | }); err != nil { |
| 181 | return nil, err |
| 182 | } |
| 183 | handle, err := projectiondb.Open(p.ctx, opts) |
| 184 | if err != nil { |
| 185 | return nil, err |
| 186 | } |
| 187 | return handle.DB, nil |
| 188 | } |
| 189 |