271 lines
7.6 KiB
Go
271 lines
7.6 KiB
Go
/*
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* Copyright 2025 coze-dev Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package builtin
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import (
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"context"
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"encoding/base64"
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"encoding/json"
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"fmt"
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"io"
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"os"
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"os/exec"
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"strings"
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"github.com/cloudwego/eino/components/document/parser"
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"github.com/cloudwego/eino/schema"
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"github.com/coze-dev/coze-studio/backend/infra/contract/document"
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"github.com/coze-dev/coze-studio/backend/infra/contract/document/ocr"
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contract "github.com/coze-dev/coze-studio/backend/infra/contract/document/parser"
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"github.com/coze-dev/coze-studio/backend/infra/contract/storage"
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)
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const (
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contentTypeText = "text"
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contentTypeImage = "image"
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contentTypeTable = "table"
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)
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type pyParseRequest struct {
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ExtractImages bool `json:"extract_images"`
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ExtractTables bool `json:"extract_tables"`
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FilterPages []int `json:"filter_pages"`
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}
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type pyParseResult struct {
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Error string `json:"error"`
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Content []*pyParseContent `json:"content"`
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}
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type pyParseContent struct {
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Type string `json:"type"`
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Content string `json:"content"`
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Table [][]string `json:"table"`
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Page int `json:"page"`
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}
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type pyPDFTableIterator struct {
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i int
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rows [][]string
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}
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func (p *pyPDFTableIterator) NextRow() (row []string, end bool, err error) {
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if p.i >= len(p.rows) {
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return nil, true, nil
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}
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row = p.rows[p.i]
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p.i++
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return row, false, nil
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}
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func parseByPython(config *contract.Config, storage storage.Storage, ocr ocr.OCR, pyPath, scriptPath string) parseFn {
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return func(ctx context.Context, reader io.Reader, opts ...parser.Option) (docs []*schema.Document, err error) {
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pr, pw, err := os.Pipe()
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if err != nil {
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return nil, fmt.Errorf("[parseByPython] create rpipe failed, %w", err)
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}
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r, w, err := os.Pipe()
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if err != nil {
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return nil, fmt.Errorf("[parseByPython] create pipe failed: %w", err)
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}
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options := parser.GetCommonOptions(&parser.Options{ExtraMeta: map[string]any{}}, opts...)
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reqb, err := json.Marshal(pyParseRequest{
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ExtractImages: config.ParsingStrategy.ExtractImage,
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ExtractTables: config.ParsingStrategy.ExtractTable,
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FilterPages: config.ParsingStrategy.FilterPages,
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})
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if err != nil {
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return nil, fmt.Errorf("[parseByPython] create parse request failed, %w", err)
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}
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if _, err = pw.Write(reqb); err != nil {
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return nil, fmt.Errorf("[parseByPython] write parse request bytes failed, %w", err)
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}
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if err = pw.Close(); err != nil {
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return nil, fmt.Errorf("[parseByPython] close write request pipe failed, %w", err)
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}
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cmd := exec.Command(pyPath, scriptPath)
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cmd.Stdin = reader
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cmd.Stdout = os.Stdout
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cmd.ExtraFiles = []*os.File{w, pr}
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if err = cmd.Start(); err != nil {
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return nil, fmt.Errorf("[parseByPython] failed to start Python script: %w", err)
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}
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if err = w.Close(); err != nil {
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return nil, fmt.Errorf("[parseByPython] failed to close write pipe: %w", err)
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}
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result := &pyParseResult{}
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if err = json.NewDecoder(r).Decode(result); err != nil {
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return nil, fmt.Errorf("[parseByPython] failed to decode result: %w", err)
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}
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if err = cmd.Wait(); err != nil {
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return nil, fmt.Errorf("[parseByPython] cmd wait err: %w", err)
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}
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if result.Error != "" {
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return nil, fmt.Errorf("[parseByPython] python execution failed: %s", result.Error)
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}
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for i, item := range result.Content {
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switch item.Type {
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case contentTypeText:
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partDocs, err := chunkCustom(ctx, item.Content, config, opts...)
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if err != nil {
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return nil, fmt.Errorf("[parseByPython] chunk text failed, %w", err)
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}
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docs = append(docs, partDocs...)
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case contentTypeImage:
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if !config.ParsingStrategy.ExtractImage {
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continue
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}
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image, err := base64.StdEncoding.DecodeString(item.Content)
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if err != nil {
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return nil, fmt.Errorf("[parseByPython] decode image failed, %w", err)
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}
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imgSrc, err := putImageObject(ctx, storage, "png", getCreatorIDFromExtraMeta(options.ExtraMeta), image)
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if err != nil {
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return nil, err
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}
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label := fmt.Sprintf("\n%s", imgSrc)
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if config.ParsingStrategy.ImageOCR && ocr != nil {
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texts, err := ocr.FromBase64(ctx, item.Content)
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if err != nil {
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return nil, fmt.Errorf("[parseByPython] FromBase64 failed, %w", err)
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}
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label += strings.Join(texts, "\n")
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}
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if i == len(result.Content)-1 || result.Content[i+1].Type != "text" {
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doc := &schema.Document{
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Content: label,
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MetaData: map[string]any{},
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}
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for k, v := range options.ExtraMeta {
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doc.MetaData[k] = v
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}
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docs = append(docs, doc)
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} else {
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// TODO: 这里有点问题，img label 可能被较短的 chunk size 截断
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result.Content[i+1].Content = label + result.Content[i+1].Content
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}
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case contentTypeTable:
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if !config.ParsingStrategy.ExtractTable {
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continue
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}
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iterator := &pyPDFTableIterator{i: 0, rows: item.Table}
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rawTableDocs, err := parseByRowIterator(iterator, &contract.Config{
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FileExtension: contract.FileExtensionCSV,
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ParsingStrategy: &contract.ParsingStrategy{
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HeaderLine: 0,
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DataStartLine: 1,
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RowsCount: 0,
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},
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ChunkingStrategy: config.ChunkingStrategy,
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}, opts...)
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if err != nil {
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return nil, fmt.Errorf("[parseByPython] parse table failed, %w", err)
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}
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fmtTableDocs, err := formatTablesInDocument(rawTableDocs)
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if err != nil {
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return nil, fmt.Errorf("[parseByPython] format table failed, %w", err)
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}
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docs = append(docs, fmtTableDocs...)
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default:
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return nil, fmt.Errorf("[parseByPython] invalid content type: %s", item.Type)
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}
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}
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return docs, nil
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}
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}
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func formatTablesInDocument(input []*schema.Document) (output []*schema.Document, err error) {
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const (
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maxSize = 65535
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tableStart, tableEnd = "<table>", "</table>"
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)
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var (
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buffer strings.Builder
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firstDoc *schema.Document
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)
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endSize := len(tableEnd)
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buffer.WriteString(tableStart)
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push := func() {
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newDoc := &schema.Document{
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Content: buffer.String() + tableEnd,
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MetaData: map[string]any{},
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}
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for k, v := range firstDoc.MetaData {
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if k == document.MetaDataKeyColumnData {
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continue
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}
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newDoc.MetaData[k] = v
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}
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output = append(output, newDoc)
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buffer.Reset()
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buffer.WriteString(tableStart)
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}
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write := func(contents []string) {
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row := fmt.Sprintf("<tr><td>%s</td></tr>", strings.Join(contents, "</td><td>"))
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buffer.WriteString(row)
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if buffer.Len()+endSize >= maxSize {
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push()
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}
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}
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for i := range input {
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doc := input[i]
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if i == 0 {
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firstDoc = doc
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cols, err := document.GetDocumentColumns(doc)
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if err != nil {
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return nil, fmt.Errorf("[formatTablesInDocument] invalid table columns, %w", err)
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}
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values := make([]string, 0, len(cols))
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for _, col := range cols {
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values = append(values, col.Name)
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}
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write(values)
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}
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data, err := document.GetDocumentColumnData(doc)
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if err != nil {
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return nil, fmt.Errorf("[formatTablesInDocument] invalid table data, %w", err)
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}
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values := make([]string, 0, len(data))
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for _, col := range data {
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values = append(values, col.GetNullableStringValue())
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}
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write(values)
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}
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if buffer.String() != tableStart {
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push()
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}
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return
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}
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