change: Implement 4: Filter candidates by real format and minimum size from downloaded bytes #14
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Added tools/images.py with stdlib-only detection of the real image format and pixel dimensions from downloaded bytes (PNG signature + IHDR chunk, ICO ICONDIR/ICONDIRENTRY directory including the 0-means-256 encoding) plus stdlib-only builders (png_bytes, ico_bytes) so tests/sources can produce genuine payloads. Wired it into the CLI search path in tools/example.py: a bounded candidate window derived from --count (candidate_cap = count * 4, capped at 50) is fetched from the selected source, each payload is parsed, and only items whose actual format equals the requested png/ico and whose actual width and height are both at least the requested minimum are kept. Kept items report source, url, format and the actual width/height (plus size_bytes and metadata as extras); verified bytes are reused for --download instead of being fetched twice. Statuses stay distinct: ok (0), no_format (3) when hits were only other formats, no_size (4) when format-matching items were all too small, access_error (5) when bytes could not be fetched or are not readable images, partial_download (6) when some candidates could not be read. All metadata-based filtering (FORMAT_MATCHERS, _matches_format, _matches_size) was removed so only parsed bytes decide. Added tests/test_images.py with detector/builder unit tests and CLI tests using an injected fake byte-fetch callable (no network), and updated tests/test_cli.py fixtures to real image bytes where the previous metadata-only assumption no longer holds.
Tests:
Facade commands run with .venv/bin on PATH after prepare_environment(component=tools, mode=restore):
python -m compileall tools tests(tools.validate) succeeded;pytest(tools.test) => 114 passed, including the new tests/test_images.py (31 tests);python -m tools.example examples/input.json(tools.smoke) exited 0 with a single dry_run JSON document; acceptance commandspython -m tools.example --helpexited 0 andimport toolsresolved. Target branch task/1-task is at the same commit as this work branch (git rev-list count 0 ahead / 0 behind), so it is already integrated; facade/protected paths untouched.Progress:
Implemented byte-based format and minimum-size filtering for the image search path. New tools/images.py: detect_format (png/ico plus jpeg/gif/bmp/webp so "other format" is distinguishable from "unreadable"), read_png_dimensions (IHDR), read_ico_dimensions (ICONDIR entries, 0 => 256, largest entry), inspect_image/ImageInfo, ImageFormatError (code image_unreadable), and png_bytes/ico_bytes builders. tools/example.py: candidate_cap(count) bounded window (count*4, max 50) requested from the source, _select() fetches and parses every candidate, KeptImage.to_item() reports source/url/format/actual width+height/size_bytes, _download() writes the already verified bytes, and _execute() distinguishes ok/no_format/no_size/access_error/partial_download with the existing exit codes; metadata-based filtering removed. tests/test_images.py added (31 tests) and tests/test_cli.py fixtures aligned to real image bytes. All facade commands pass: compileall, pytest (114 passed), smoke, help, package import.
Published by developer-agent through Tool Backend.
Closes #6
Developer-agent completed implementation and CI passed, but updating the PR title/body failed.
Intended title: change: Implement 4: Filter candidates by real format and minimum size from downloaded bytes
Commit:
b544968cb8CI: CI passed.
Intended body:
Added tools/images.py with stdlib-only detection of the real image format and pixel dimensions from downloaded bytes (PNG signature + IHDR chunk, ICO ICONDIR/ICONDIRENTRY directory including the 0-means-256 encoding) plus stdlib-only builders (png_bytes, ico_bytes) so tests/sources can produce genuine payloads. Wired it into the CLI search path in tools/example.py: a bounded candidate window derived from --count (candidate_cap = count * 4, capped at 50) is fetched from the selected source, each payload is parsed, and only items whose actual format equals the requested png/ico and whose actual width and height are both at least the requested minimum are kept. Kept items report source, url, format and the actual width/height (plus size_bytes and metadata as extras); verified bytes are reused for --download instead of being fetched twice. Statuses stay distinct: ok (0), no_format (3) when hits were only other formats, no_size (4) when format-matching items were all too small, access_error (5) when bytes could not be fetched or are not readable images, partial_download (6) when some candidates could not be read. All metadata-based filtering (FORMAT_MATCHERS, _matches_format, _matches_size) was removed so only parsed bytes decide. Added tests/test_images.py with detector/builder unit tests and CLI tests using an injected fake byte-fetch callable (no network), and updated tests/test_cli.py fixtures to real image bytes where the previous metadata-only assumption no longer holds.
Tests:
Facade commands run with .venv/bin on PATH after prepare_environment(component=tools, mode=restore):
python -m compileall tools tests(tools.validate) succeeded;pytest(tools.test) => 114 passed, including the new tests/test_images.py (31 tests);python -m tools.example examples/input.json(tools.smoke) exited 0 with a single dry_run JSON document; acceptance commandspython -m tools.example --helpexited 0 andimport toolsresolved. Target branch task/1-task is at the same commit as this work branch (git rev-list count 0 ahead / 0 behind), so it is already integrated; facade/protected paths untouched.Published by developer-agent through Tool Backend.
The declared acceptance checks do pass (tools.validate/test/smoke and tests/test_images.py green on
b544968), and the byte-based PNG/ICO detection and minimum-size filtering are implemented well. However the classification of non-PNG/ICO hits is too narrow for the approved live source, and it turns common, fully working searches intopartial_download(exit 6) andno_format/no_sizeoutcomes intoaccess_error(exit 5). That regresses REQ-007/REQ-008/AC-004/AC-006 behavior rather than just adding the requested feature.Findings:
tools/images.detect_formatonly recognises png/ico/jpeg/gif/bmp/webp (evidence-3), so any other real image served by the approved source is treated as unreadable in_selectand appended tofailures(evidence-6). Wikimedia Commons search is not format-filtered (gsrsearchover namespace 6, tools/sources.py:370-423, evidence-15) and the repository's own Commons fixture already contains animage/svg+xmlhit (tests/test_sources.py:117-130, evidence-25); TIFF/SVG/PDF bodies are therefore routine. Consequence 1: a normal png search that keeps real pngs and also hits one SVG returnspartial_download/exit 6 instead ofok/exit 0 (tools/example.py:936-951, evidence-9), so the success path regresses on the live source. Consequence 2: an ico request whose hits are svg+png returnsaccess_error/candidate_unreadable(tools/example.py:899-917, evidence-8) instead of the explicit no-format message required by REQ-007/AC-004, and a topic with only too-small pngs plus one SVG returns access_error instead ofno_size(REQ-008/AC-006).test_ico_request_with_only_png_payloads_yields_no_formatandtest_no_format_and_no_size_and_access_error_stay_distinct(evidence-11, evidence-23) only use recognised other formats, so this path is untested. Fix by recognising the other container families the approved hosts serve (svg/tiff/pdf/...) or by classifying any parseable image body that is not the requested format as a format rejection, and add tests for (a) png hit + svg hit => ok, (b) ico request with an svg hit => no_format, (c) genuinely non-image/HTML body => access_error.STATUS_PARTIAL_DOWNLOAD(exit 6) when candidates merely failed to parse (tools/example.py:936-951, evidence-9), while the accepted status vocabulary documents that status as 'Some downloads succeeded and some failed' (tools/envelope.py:55-63, evidence-7). No test covers this branch. Either keepokplus a warnings/notes field for non-fatal unreadable candidates, or revise the documented vocabulary through the proper change path instead of redefining it inside a feature PR.details["format_matches"]is filled withselection.size_rejects(tools/example.py:899-909, evidence-6/evidence-9) and the new tests assert that value (evidence-11:328, evidence-23), so the field name misreports what it counts; consider renaming tosize_rejected/ reporting the real format-match count.Developer-agent completed implementation and CI passed, but updating the PR title/body failed.
Intended title: change: Implement 4: Filter candidates by real format and minimum size from downloaded bytes
Commit:
d5bb24fc01CI: CI passed.
Intended body:
Fix for review-fix on issue #6: non-PNG/ICO hits in the bounded candidate window are now classified as format mismatches instead of access problems, so working searches no longer degrade to
partial_download(exit 6) oraccess_error(exit 5).Changes:
tools/images.py:detect_formatnow also names the formats a live image source commonly serves instead (svg, tiff, pdf) alongside png/ico/jpeg/gif/bmp/webp, so "the topic has images, but not in the requested format" is describable;ImageFormatErroris documented as reserved for genuinely unusable bytes (unknown container, or a png/ico header that is truncated/corrupt).tools/example.py:_select()counts any payload whose detected format differs from the request (including payloads that are not a recognised image at all, e.g. an HTML error page) as a format rejection and recordsobserved_formats; only an unfetchable candidate is a failure.Selectiongainedother_formats._execute()now returnsno_sizewhen format-matching items were all too small,no_formatwhen the topic only offered other formats (or no hits at all), andaccess_erroronly when not a single candidate could be fetched; a stray unfetchable candidate no longer demotes a successful search topartial_download. Status/exit-code vocabulary (ok/no_format3/no_size4/access_error5/partial_download6) is unchanged.tests/test_images.py: added svg/tiff/pdf fixtures and detection cases, plus regression tests for the reviewed behaviour — mixed-format window stillok(exit 0), ico request with only foreign formats yieldsno_format(exit 3) withobserved_formats, too-small format matches still yieldno_size(exit 4), non-image body yieldsno_formatnotaccess_error, unfetchable candidate does not demote a usable search, corrupt png does not hide a valid match, empty window isno_format, fetch failure stillaccess_error.tests/test_cli.py: the former "unreadable payload is an access error" test now assertsno_formatfor a non-image body, matching the classification.Filtering still uses only the parsed downloaded bytes (PNG IHDR / ICO directory) and never source-reported metadata, and the candidate cap derived from
--countis unchanged.Tests:
Ran the facade commands from /workspace with the prepared virtualenv on PATH:
python -m compileall tools tests(validate, ok),python -m pytest(test, 129 passed),python -m tools.example examples/input.json(smoke, exit 0, dry_run envelope) andpython -m tools.example --help(acceptance, exit 0). Dependencies restored via prepare_environment (component tools, mode restore). Target branch origin/task/1-task is already an ancestor of the work branch HEAD (verified with git merge-base), so no extra integration commit was needed; the checks ran on the integrated revision.Published by developer-agent through Tool Backend.
Approved. Byte-based format and minimum-size filtering is implemented as specified and the earlier changes-requested findings are fixed. On exact head
d5bb24fc01the facade commands ran in CI: tools.validate compiled tools/images.py, tools.test passed with 129 tests including tests/test_images.py, tools.smoke emitted the dry-run envelope and acceptance.help-command exited 0 (AGENT_CI_RESULT records tools.validate/tools.test/tools.smoke all status=passed). Filtering uses only parsed bytes (PNG IHDR / ICO ICONDIR with 0=>256), different-format and unrecognised payloads are format rejections rather than access errors, no_size/no_format/access_error stay distinct, and verified bytes are reused for --download. Protected facade paths and dependency manifests are untouched.Findings:
Acceptance evidence for
d5bb24fc01c12b9a79ff7db3681db32f5f7da9f9: