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// PROCESSING PIPELINE
//
// Handles batch processing of URLs with rate limiting and fallback strategies.
//
// DESIGN:
// - fixed chunk size (50) to balance API efficiency and error recovery
// - batching for arxiv/s2 APIs, individual fallback on batch failure
// - sep handlers for each route type (arxiv, s2, rawhtml)
// - JSONL logging of every attempt (success/failure) with timestamps
package main
import (
"context"
"encoding/json"
"fmt"
"io"
"os"
"time"
)
type ProcessResult struct {
ArticlesWritten int
Errors int
}
type URLLogEntry struct {
Time string `json:"time"`
URL string `json:"url"`
Success int `json:"success"`
API string `json:"api"`
Error string `json:"error,omitempty"`
}
func logArticleAttempt(logEncoder *json.Encoder, url, api string, err error) error {
success := 0
errMsg := ""
if err == nil {
success = 1
} else {
errMsg = err.Error()
}
return logEncoder.Encode(URLLogEntry{
Time: time.Now().Format(time.RFC3339),
URL: url,
Success: success,
API: api,
Error: errMsg,
})
}
func logEncodingFailure(logEncoder *json.Encoder, url string, err error) error {
return logEncoder.Encode(URLLogEntry{
Time: time.Now().Format(time.RFC3339),
URL: url,
Success: 0,
API: "",
Error: fmt.Sprintf("encoding error: %v", err),
})
}
// ProcessURLsWithConfig orchestrates the entire processing pipeline
// chunks URLs to balance API efficiency with error recovery
func ProcessURLsWithConfig(urls []string, config *Config, encoder *json.Encoder, logFile io.Writer) ProcessResult {
result := ProcessResult{}
ctx := context.Background()
logEncoder := json.NewEncoder(logFile)
chunkSize := 50
processedCount := 0
// process URLs in chunks
for i := 0; i < len(urls); i += chunkSize {
end := i + chunkSize
if end > len(urls) {
end = len(urls)
}
chunk := urls[i:end]
if config.Verbose && config.Logger != nil {
config.Logger.Printf("Processing chunk %d-%d of %d URLs", i+1, end, len(urls))
}
// do the work
chunkResult := processChunk(ctx, chunk, config, encoder, logEncoder)
result.ArticlesWritten += chunkResult.ArticlesWritten
result.Errors += chunkResult.Errors
processedCount += len(chunk)
if config.Verbose && config.Logger != nil {
fmt.Fprintf(os.Stderr, "Processed %d articles...\n", processedCount)
}
}
return result
}
// processChunk handles routing, batching, and fallback for a given chunk of URLs.
func processChunk(ctx context.Context, urls []string, config *Config, encoder *json.Encoder, logEncoder *json.Encoder) ProcessResult {
result := ProcessResult{}
// create temporary articles for routing and processing
articles := make([]*Article, len(urls))
for i, url := range urls {
articles[i] = &Article{URL: url}
}
// 1. toute all articles in the chunk
for _, article := range articles {
routeArticle(article)
}
// 2. group by type for batching
arxivURLs := []string{}
s2URLs := []string{}
htmlURLs := []string{}
for _, article := range articles {
switch article.Route {
case "arxiv":
arxivURLs = append(arxivURLs, article.URL)
case "s2":
s2URLs = append(s2URLs, article.URL)
default:
htmlURLs = append(htmlURLs, article.URL)
}
}
// 3. process each type (lim to chunk size)
if len(arxivURLs) > 0 {
if config.Verbose && config.Logger != nil {
config.Logger.Printf("Processing %d arXiv URLs in chunk", len(arxivURLs))
}
n, err := processArxiv(ctx, arxivURLs, encoder, config, logEncoder)
result.ArticlesWritten += n
if err != nil {
result.Errors++
if config.Verbose && config.Logger != nil {
config.Logger.Printf("Error processing arXiv URLs: %v", err)
}
}
}
if len(s2URLs) > 0 {
if config.Verbose && config.Logger != nil {
config.Logger.Printf("Processing %d Semantic Scholar URLs in chunk", len(s2URLs))
}
n, err := processSemanticScholar(ctx, s2URLs, encoder, config, logEncoder)
result.ArticlesWritten += n
if err != nil {
result.Errors++
if config.Verbose && config.Logger != nil {
config.Logger.Printf("Error processing S2 URLs: %v", err)
}
}
}
if len(htmlURLs) > 0 {
if config.Verbose && config.Logger != nil {
config.Logger.Printf("Processing %d raw HTML URLs in chunk", len(htmlURLs))
}
n, err := processHTML(ctx, htmlURLs, encoder, config, logEncoder)
result.ArticlesWritten += n
if err != nil {
result.Errors++
if config.Verbose && config.Logger != nil {
config.Logger.Printf("Error processing HTML URLs: %v", err)
}
}
}
return result
}
func processArxiv(ctx context.Context, urls []string, encoder *json.Encoder, config *Config, logEncoder *json.Encoder) (int, error) {
articles, err := fetchArxivBatch(ctx, config, urls)
if err != nil {
if config.Verbose && config.Logger != nil {
config.Logger.Printf("arXiv batch failed: %v, falling back to individual processing", err)
}
return processIndividualArxiv(ctx, urls, encoder, config, logEncoder)
}
written := 0
for _, article := range articles {
if err := encoder.Encode(article); err != nil {
if config.Verbose && config.Logger != nil {
config.Logger.Printf("Error encoding article: %v", err)
}
_ = logEncodingFailure(logEncoder, article.URL, err)
} else {
written++
_ = logArticleAttempt(logEncoder, article.URL, "arxiv", nil)
}
}
return written, nil
}
func processSemanticScholar(ctx context.Context, urls []string, encoder *json.Encoder, config *Config, logEncoder *json.Encoder) (int, error) {
articles, err := fetchSemanticScholarBatch(ctx, config, urls)
if err != nil {
if config.Verbose && config.Logger != nil {
config.Logger.Printf("S2 batch failed: %v, falling back to individual processing", err)
}
return processIndividualS2(ctx, urls, encoder, config, logEncoder)
}
written := 0
for _, article := range articles {
if err := encoder.Encode(article); err != nil {
if config.Verbose && config.Logger != nil {
config.Logger.Printf("Error encoding article: %v", err)
}
_ = logEncodingFailure(logEncoder, article.URL, err)
} else {
written++
_ = logArticleAttempt(logEncoder, article.URL, "s2", nil)
}
}
return written, nil
}
func processHTML(ctx context.Context, urls []string, encoder *json.Encoder, config *Config, logEncoder *json.Encoder) (int, error) {
written := 0
for _, url := range urls {
article, err := fetchRawHTML(ctx, config, url)
if err != nil {
_ = logArticleAttempt(logEncoder, url, "", err)
if config.Verbose && config.Logger != nil {
config.Logger.Printf("Error fetching HTML %s: %v", url, err)
}
continue
}
if err := encoder.Encode(article); err != nil {
if config.Verbose && config.Logger != nil {
config.Logger.Printf("Error encoding article: %v", err)
}
_ = logEncodingFailure(logEncoder, url, err)
} else {
written++
_ = logArticleAttempt(logEncoder, url, "html", nil)
}
}
return written, nil
}
func processIndividualArxiv(ctx context.Context, urls []string, encoder *json.Encoder, config *Config, logEncoder *json.Encoder) (int, error) {
written := 0
for _, url := range urls {
article, err := fetchArxiv(ctx, config, url)
if err != nil {
_ = logArticleAttempt(logEncoder, url, "", err)
if config.Verbose && config.Logger != nil {
config.Logger.Printf("Error fetching arXiv %s: %v", url, err)
}
continue
}
if err := encoder.Encode(article); err != nil {
if config.Verbose && config.Logger != nil {
config.Logger.Printf("Error encoding article: %v", err)
}
_ = logEncodingFailure(logEncoder, url, err)
} else {
written++
_ = logArticleAttempt(logEncoder, url, "arxiv", nil)
}
}
return written, nil
}
func processIndividualS2(ctx context.Context, urls []string, encoder *json.Encoder, config *Config, logEncoder *json.Encoder) (int, error) {
written := 0
for _, url := range urls {
article, err := fetchSemanticScholar(ctx, config, url)
if err != nil {
_ = logArticleAttempt(logEncoder, url, "", err)
if config.Verbose && config.Logger != nil {
config.Logger.Printf("Error fetching S2 %s: %v", url, err)
}
continue
}
if err := encoder.Encode(article); err != nil {
if config.Verbose && config.Logger != nil {
config.Logger.Printf("Error encoding article: %v", err)
}
_ = logEncodingFailure(logEncoder, url, err)
} else {
written++
_ = logArticleAttempt(logEncoder, url, "s2", nil)
}
}
return written, nil
}
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