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|
package data
import (
"context"
"database/sql"
"time"
"github.com/jpappel/atlas/pkg/index"
)
// TODO: rename struct
//
// Use to build a document from a database connection
type Fill struct {
Path string
Db *sql.DB
id int
doc *index.Document
}
// TODO: rename struct
//
// Use to build documents and aliases from a database connection
type FillMany struct {
docs map[string]*index.Document
ids map[string]int
Db *sql.DB
}
func (f Fill) Get(ctx context.Context) (*index.Document, error) {
f.doc = &index.Document{Path: f.Path}
if err := f.document(ctx); err != nil {
return nil, err
}
if err := f.tags(ctx); err != nil {
return nil, err
}
if err := f.authors(ctx); err != nil {
return nil, err
}
if err := f.links(ctx); err != nil {
return nil, err
}
return f.doc, nil
}
func (f FillMany) Get(ctx context.Context) (map[string]*index.Document, error) {
f.docs = make(map[string]*index.Document)
f.ids = make(map[string]int)
if err := f.documents(ctx); err != nil {
return nil, err
}
if err := f.tags(ctx); err != nil {
return nil, err
}
if err := f.links(ctx); err != nil {
return nil, err
}
if err := f.authors(ctx); err != nil {
return nil, err
}
return f.docs, nil
}
func (f *Fill) document(ctx context.Context) error {
var title sql.NullString
var dateEpoch sql.NullInt64
var fileTimeEpoch sql.NullInt64
var meta sql.NullString
row := f.Db.QueryRowContext(ctx, `
SELECT id, title, date, fileTime, meta
FROM Documents
WHERE path = ?
`, f.Path)
if err := row.Scan(&f.id, &title, &dateEpoch, &fileTimeEpoch, &meta); err != nil {
return err
}
if title.Valid {
f.doc.Title = title.String
}
if dateEpoch.Valid {
f.doc.Date = time.Unix(dateEpoch.Int64, 0)
}
if fileTimeEpoch.Valid {
f.doc.FileTime = time.Unix(fileTimeEpoch.Int64, 0)
}
if meta.Valid {
f.doc.OtherMeta = meta.String
}
return nil
}
func (f *FillMany) documents(ctx context.Context) error {
rows, err := f.Db.QueryContext(ctx, `
SELECT id, path, title, date, fileTime, meta
FROM Documents
`)
if err != nil {
return err
}
defer rows.Close()
var id int
var docPath string
var title, meta sql.NullString
var dateEpoch, filetimeEpoch sql.NullInt64
for rows.Next() {
if err := rows.Scan(&id, &docPath, &title, &dateEpoch, &filetimeEpoch, &meta); err != nil {
return err
}
doc := &index.Document{
Path: docPath,
}
if title.Valid {
doc.Title = title.String
}
if dateEpoch.Valid {
doc.Date = time.Unix(dateEpoch.Int64, 0)
}
if filetimeEpoch.Valid {
doc.FileTime = time.Unix(filetimeEpoch.Int64, 0)
}
if meta.Valid {
doc.OtherMeta = meta.String
}
f.docs[docPath] = doc
f.ids[docPath] = id
}
return nil
}
func (f Fill) authors(ctx context.Context) error {
rows, err := f.Db.QueryContext(ctx, `
SELECT name
FROM Authors
JOIN DocumentAuthors
ON Authors.id = DocumentAuthors.authorId
WHERE docId = ?
`, f.id)
if err != nil {
return err
}
defer rows.Close()
var name string
authors := make([]string, 0, 4)
for rows.Next() {
if err := rows.Scan(&name); err != nil {
return err
}
authors = append(authors, name)
}
f.doc.Authors = authors
return nil
}
func (f FillMany) authors(ctx context.Context) error {
stmt, err := f.Db.PrepareContext(ctx, `
SELECT name
FROM Authors
JOIN DocumentAuthors
ON Authors.id = DocumentAuthors.authorId
WHERE docId = ?
`)
if err != nil {
return err
}
defer stmt.Close()
// PERF: parallelize
var name string
for path, id := range f.ids {
rows, err := stmt.QueryContext(ctx, id)
if err != nil {
return err
}
doc := f.docs[path]
for rows.Next() {
if err := rows.Scan(&name); err != nil {
rows.Close()
return err
}
doc.Authors = append(doc.Authors, name)
}
rows.Close()
}
return nil
}
func (f Fill) tags(ctx context.Context) error {
rows, err := f.Db.QueryContext(ctx, `
SELECT name
FROM Tags
JOIN DocumentTags
ON Tags.id = DocumentTags.tagId
WHERE docId = ?
`, f.id)
if err != nil {
panic(err)
}
defer rows.Close()
var tag string
tags := make([]string, 0, 2)
for rows.Next() {
if err := rows.Scan(&tag); err != nil {
return err
}
tags = append(tags, tag)
}
f.doc.Tags = tags
return nil
}
func (f FillMany) tags(ctx context.Context) error {
stmt, err := f.Db.PrepareContext(ctx, `
SELECT name
FROM Tags
JOIN DocumentTags
ON Tags.id = DocumentTags.tagId
WHERE docId = ?
`)
if err != nil {
return err
}
defer stmt.Close()
// PERF: parallelize
var tag string
for docPath, id := range f.ids {
rows, err := stmt.QueryContext(ctx, id)
if err != nil {
return err
}
doc := f.docs[docPath]
for rows.Next() {
if err := rows.Scan(&tag); err != nil {
rows.Close()
return err
}
doc.Tags = append(doc.Tags, tag)
}
rows.Close()
}
return nil
}
func (f Fill) links(ctx context.Context) error {
rows, err := f.Db.QueryContext(ctx, `
SELECT path
FROM Documents
JOIN Links
ON Links.referencedId = Documents.id
WHERE Links.refererId = ?
`, f.id)
if err != nil {
return err
}
defer rows.Close()
var link string
links := make([]string, 0)
for rows.Next() {
if err := rows.Scan(&link); err != nil {
return err
}
links = append(links, link)
}
f.doc.Links = links
return nil
}
func (f FillMany) links(ctx context.Context) error {
stmt, err := f.Db.PrepareContext(ctx, `
SELECT path
FROM Documents
JOIN Links
ON Links.referencedId = Documents.id
WHERE Links.refererId = ?
`)
if err != nil {
return err
}
defer stmt.Close()
// PERF: parallelize
var linkPath string
for path, id := range f.ids {
rows, err := stmt.QueryContext(ctx, id)
if err != nil {
return err
}
doc := f.docs[path]
for rows.Next() {
if err := rows.Scan(&linkPath); err != nil {
rows.Close()
return err
}
doc.Links = append(doc.Links, linkPath)
}
rows.Close()
}
return nil
}
|
