⚡ Bolt: Optimize JSON-LD parsing for movie scraper#82
⚡ Bolt: Optimize JSON-LD parsing for movie scraper#82bartholomej wants to merge 1 commit intomasterfrom
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- Parse JSON-LD once in `MovieScraper.movie` service - Pass parsed object to `getMovieYear` and `getMovieDuration` helpers - Update helpers to accept object instead of string - Improve error handling for missing/invalid JSON-LD - Update tests to reflect changes Co-authored-by: bartholomej <5861310+bartholomej@users.noreply.github.com>
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📝 WalkthroughWalkthroughJSON-LD data handling is refactored to parse the script content once at the service layer, then pass the parsed object to helper functions instead of passing raw strings, improving data accessibility in downstream operations. Changes
Estimated code review effort🎯 2 (Simple) | ⏱️ ~12 minutes Possibly related PRs
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Additional details and impacted files@@ Coverage Diff @@
## master #82 +/- ##
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- Coverage 99.52% 99.20% -0.32%
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Files 28 28
Lines 629 631 +2
Branches 143 145 +2
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Actionable comments posted: 1
🤖 Fix all issues with AI agents
In `@src/services/movie.service.ts`:
- Around line 44-50: The code dereferences movieHtml.querySelector(...) without
checking for null, causing a TypeError before JSON.parse is attempted; update
the block around movieHtml, jsonLdString and jsonLd so you first call const
script = movieHtml.querySelector('script[type="application/ld+json"]') and check
if script is truthy before accessing script.innerText (if absent set jsonLd =
null and log or return early), then keep the JSON.parse inside the try/catch to
handle parse errors; reference movieHtml, jsonLdString, jsonLd and the
querySelector call when making this change.
🧹 Nitpick comments (2)
src/helpers/movie.helper.ts (1)
126-131: Return type doesn't reflectnullreturn.
getMovieYeardeclares: numberbut returnsnullon line 130. Same applies togetMovieDurationon line 133. Consider updating the return types tonumber | nullfor type safety.Suggested fix
-export const getMovieYear = (jsonLd: any): number => { +export const getMovieYear = (jsonLd: any): number | null => {-export const getMovieDuration = (jsonLd: any, el: HTMLElement): number => { +export const getMovieDuration = (jsonLd: any, el: HTMLElement): number | null => {Note: Several other existing functions in this file (e.g.,
getMovieRating,getMovieRatingCount) have the same issue, so this is a pre-existing pattern — but since these signatures are being changed anyway, it's a good time to fix them.tests/movie.test.ts (1)
51-58: Test fallback diverges from production behavior.When the JSON-LD script element is missing, the test helper falls back to
'{}'(yielding an empty object), while the service code (movie.service.tsline 44-50) would result innull. The helpers happen to handle both correctly today, but this inconsistency could mask a bug if future code distinguishes betweennulland{}.Consider aligning the fallback:
- const json = node.querySelector('script[type="application/ld+json"]')?.innerText || '{}'; - try { - return JSON.parse(json); - } catch (e) { - return null; - } + const jsonLdScript = node.querySelector('script[type="application/ld+json"]'); + if (!jsonLdScript) return null; + try { + return JSON.parse(jsonLdScript.innerText); + } catch (e) { + return null; + }
| const jsonLdString = movieHtml.querySelector('script[type="application/ld+json"]').innerText; | ||
| let jsonLd = null; | ||
| try { | ||
| jsonLd = JSON.parse(jsonLdString); | ||
| } catch (e) { | ||
| console.error('node-csfd-api: Error parsing JSON-LD', e); | ||
| } |
There was a problem hiding this comment.
Null-pointer dereference if <script type="application/ld+json"> is missing.
Line 44 calls .innerText on the result of querySelector, which returns null when no matching element exists. This will throw a TypeError before the try/catch on line 46 can catch it.
Proposed fix
- const jsonLdString = movieHtml.querySelector('script[type="application/ld+json"]').innerText;
- let jsonLd = null;
- try {
- jsonLd = JSON.parse(jsonLdString);
- } catch (e) {
- console.error('node-csfd-api: Error parsing JSON-LD', e);
- }
+ const jsonLdScript = movieHtml.querySelector('script[type="application/ld+json"]');
+ let jsonLd = null;
+ if (jsonLdScript) {
+ try {
+ jsonLd = JSON.parse(jsonLdScript.innerText);
+ } catch (e) {
+ console.error('node-csfd-api: Error parsing JSON-LD', e);
+ }
+ }📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| const jsonLdString = movieHtml.querySelector('script[type="application/ld+json"]').innerText; | |
| let jsonLd = null; | |
| try { | |
| jsonLd = JSON.parse(jsonLdString); | |
| } catch (e) { | |
| console.error('node-csfd-api: Error parsing JSON-LD', e); | |
| } | |
| const jsonLdScript = movieHtml.querySelector('script[type="application/ld+json"]'); | |
| let jsonLd = null; | |
| if (jsonLdScript) { | |
| try { | |
| jsonLd = JSON.parse(jsonLdScript.innerText); | |
| } catch (e) { | |
| console.error('node-csfd-api: Error parsing JSON-LD', e); | |
| } | |
| } |
🤖 Prompt for AI Agents
In `@src/services/movie.service.ts` around lines 44 - 50, The code dereferences
movieHtml.querySelector(...) without checking for null, causing a TypeError
before JSON.parse is attempted; update the block around movieHtml, jsonLdString
and jsonLd so you first call const script =
movieHtml.querySelector('script[type="application/ld+json"]') and check if
script is truthy before accessing script.innerText (if absent set jsonLd = null
and log or return early), then keep the JSON.parse inside the try/catch to
handle parse errors; reference movieHtml, jsonLdString, jsonLd and the
querySelector call when making this change.
bartholomej
deleted the
bolt/optimize-json-ld-parsing-12862088809958610880
branch
2 participants
💡 What: Refactored
MovieScraperto parse the JSON-LD metadata string once in the service layer instead of repeatedly parsing it inside helper functions (getMovieYearandgetMovieDuration).🎯 Why: Parsing the same JSON string multiple times is redundant and inefficient.
📊 Impact: Reduces JSON parsing operations from O(n) (where n is the number of helpers needing JSON-LD) to O(1) per movie.
🔬 Measurement:
yarn testpasses. Verified thatnullJSON-LD is handled gracefully.PR created automatically by Jules for task 12862088809958610880 started by @bartholomej
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