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feat(engine): a script's spectral zone is read on the script's copy, off the UI thread (#1562) - #1721
Follow-up to #1719 (#1562), from its last review point (github-actions, AGENTS.md › Never hold the window): raster.spectral with a zone read the zone's window of cells on the session's thread, so a large zone in a script held the window.
raster.spectral is now on ON_A_COPY, since it changes nothing outside the session. A script's zone is read on the script's copy, with Run Script's progress and Cancel. It is recorded (ZonesAhead, like a batch's files), and the run here takes it when the raster and the polygon are still the ones that were read; otherwise it reads them again.
No pane of the app asks for a zone (the Image Analysis pane asks only for points). The assistant, tasks and the command line run every command where they are asked, with no background path of their own, so a zone they ask for is read there. The command's doc comment says so.
A raster a tool made earlier in the same script is decoded separately on each side, so its zones are read again here. The answers stay the same.
Docs: the script paragraph and the Spectral Analysis entry in docs/user-guide/analysis.md.
Tests: a_scripts_spectral_zone_is_read_on_its_copy covers four cases:
the script's zone is taken from the copy, with the same answer as read here;
a zone changed meanwhile is read again;
under a control cancelled once the copy starts, the zone's read looks at Cancel;
in that cancelled case, nothing lands.
No visible UI change.
Summary by CodeRabbit
New Features
Desktop scripts now calculate spectral results for polygon zones ahead of execution, up to the next stopping point. Results are reused when the zone is unchanged and recalculated if it changes.
Documentation
Updated the analysis guide to explain when spectral-zone calculations run in the background and how a stopping point affects them.
…off the UI thread (opengeos#1562)
Follow-up to opengeos#1719, from its review (github-actions, AGENTS.md "Never hold the window"):
raster.spectral with a zone read the zone's window of cells on the session's thread, so a large
zone in a script held the window.
- raster.spectral is on ON_A_COPY: it changes nothing outside the session. A script's zone is
read on the copy, with Run Script's progress and Cancel, and recorded for the run here to take,
as a batch's files are (`ZonesAhead`), when the raster and the polygon are still the ones read.
- No pane of the app asks for a zone. The assistant, tasks and the command line run every
command where they are asked, so a zone they ask for is read there; its doc comment says so.
No actionable comments were generated in the recent review.
Walkthrough
Native copied-session runs can record raster.spectral zone means. Later reads reuse a result only when the raster and polygon rings match. Tests cover matching and replaced zones, and cancellation during read-ahead.
Changes: Spectral Zone Read-Ahead
Layer / File(s)
Summary
Capture and match zone means crates/engine/src/lib.rs, crates/engine/src/cmd/imagery.rs
The session stores native-only zone read-ahead state. raster.spectral extracts polygon rings and reads zone means. Native builds reuse a recorded result when its raster and rings match; otherwise, they compute the means directly.
Wire copied-session reads and reuse crates/engine/src/cmd/workflows.rs, crates/engine/src/cmd/gp.rs, crates/engine/src/tests.rs, docs/user-guide/analysis.md
Script runs can execute raster.spectral on a copied session. The run-ahead flow transfers recorded zones for later reads. Tests cover reuse, zone replacement, and cancellation. The user guide describes background spectral-zone calculation for scripts.
sequenceDiagram
participant ScriptRun
participant SessionCopy
participant RanAheads
participant LiveSession
ScriptRun->>SessionCopy: Run raster.spectral with zone recording enabled
SessionCopy->>RanAheads: Return recorded zone means
RanAheads->>LiveSession: Install recorded zone means
LiveSession->>LiveSession: Reuse result when raster and rings match
opengeos/RustGIS#1719 — This PR continues the copied-session run-ahead flow for raster.spectral and reuses matching zone results.
opengeos/RustGIS#1487 — This PR establishes copied-session read-ahead and result reuse for model tools, a pattern extended here to spectral zones.
opengeos/RustGIS#1416 — This PR changes zonal_means processing used by the spectral zone read path.
Suggested reviewers:giswqs
Merge Risk: Minimal · up to 1aff5
Scripted zone reads run on a copy, with a documented fallback when inputs change. No merge-blocking risk was identified.
Pre-merge checks: 5
Check name
Status
Explanation
Title check
The title clearly identifies the main change: reading a script’s spectral zone on a session copy off the UI thread.
Description check
The description explains the change, lists test coverage, states that there is no visible UI change, and identifies related issues. It provides the required information, although it does not use the t…
Docstring Coverage
Docstring coverage is 85.71% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentati…
Linked Issues check
Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check
Check skipped because no linked issues were found for this pull request.
Full details: Description check
Explanation
The description explains the change, lists test coverage, states that there is no visible UI change, and identifies related issues. It provides the required information, although it does not use the template’s section headings.
Full details: Docstring Coverage
Explanation
Docstring coverage is 85.71% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 7 functions across 4 files. (2 skipped: 1 unsupported, 1 too large.)
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A rabbit checks the rings, The raster shares its means, A script runs on ahead, Matching zones return, Changed zones are read anew, Then quiet paws cancel.
Recent review info
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Commits
Reviewing files that changed from the base of the PR and between f438d74 and 1aff5f7.
Files selected for processing: 3
crates/engine/src/cmd/imagery.rs
crates/engine/src/tests.rs
docs/user-guide/analysis.md
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I found no crash, silent-loss, or data-correctness bugs. The zone-reuse check holds: the copy's result is taken only when the raster is the same Arc and the rings are equal, and zonal_means' Cancelled is the only error it can produce. Two inline comments are posted, and the nits are grouped below.
Bugs
None found.
Security
None found.
Performance
None found. Points are read twice on a script's copy and again here (at most 1,000 pixels), which is negligible.
Quality
docs/user-guide/analysis.md:1466: the parenthetical says a script's zone is read in the background. That is only true up to the first line that isn't copied (workflows.rs:855). Confidence: high. (Inline comment posted.)
crates/engine/src/cmd/gp.rs:661: the RanAheads doc comment still lists only tools and files, not zones. Confidence: high. Nit.
Test gap (tests.rs, a_scripts_spectral_zone_is_read_on_its_copy): the "changed meanwhile" case only changes the zone, not the raster, so the Arc::ptr_eq branch is untested. Confidence: medium. Nit.
analysis.md:1287: the new line is about 113 characters, longer than the surrounding wrap. Nit.
AGENTS.md
crates/engine/src/cmd/imagery.rs:928: direct zone reads (assistant, tasks, command line) and script lines after the copy stops still run on the UI thread. The doc describes this but does not say why it must stay there, which the rule requires for UI-thread commands. Confidence: medium, since I could not confirm which thread the desktop assistant uses. (Inline comment posted.)
The long_commands_stop_when_cancelled_while_they_run lists are consistent. raster.spectral is not in IN_BACKGROUND, so it correctly stays out of that test.
Wasm gating is consistent: RanAheads, taking, ran_ahead, and ZonesAhead are all non-wasm.
Earlier concerns: there were no prior review threads, so none were left alone.
Change size
Compared with the base branch: the whole PR, main (b4d86f8) to the PR head (f438d74).
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Actionable comments posted: 3
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @crates/engine/src/cmd/imagery.rs:
- Around line 999-1014: Update the mismatched-read fallback after the
`zones_ahead` replay check so `rasterops::zonal_means` for the current raster
and rings runs in the background with progress reporting and Run Script
cancellation. Before replay resumes, revalidate that the raster and polygon
inputs still match the request; preserve the existing cached-result path for
matching inputs.
Review comments at @crates/engine/src/tests.rs:
- Around line 38338-38344: Update the test around read_land so it captures the
returned value and compares its result with a direct raster.spectral run against
the changed zone; retain the zones_taken assertion and verify the result differs
from the earlier-zone result.
Review comments at @docs/user-guide/analysis.md:
- Line 1466: Qualify the sentence about a script’s zone being worked out in the
background to clarify that this applies only while execution remains in the
background prefix; after an edit, Add Data, or another command ends that prefix,
a large zone read can still block the window.
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Review info
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Run ID: 5367c99f-1930-479e-9310-e6541ad20577
Commits
Reviewing files that changed from the base of the PR and between 4a7e37f and f438d74.
Files selected for processing: 6
crates/engine/src/cmd/gp.rs
crates/engine/src/cmd/imagery.rs
crates/engine/src/cmd/workflows.rs
crates/engine/src/lib.rs
crates/engine/src/tests.rs
docs/user-guide/analysis.md
Included review availability: This review used your included allowance. Your plan provides up to 8 included reviews per hour; 7 remain after this review.
No bugs, security issues, or crash paths found in the changed lines. I read the diff, the surrounding code (reads.rs, workflows.rs, gp.rs, analysis/lib.rs, items.rs), and the new tests. I could not compile or run anything here, so this is a read-only review; CI is the check for build and test results.
Bugs: none found. Checked:
Queue handling in zone_means: a mismatched or missing entry clears the queue and reads on the run here, so no stale answer lands.
Cancellation: a cancelled copy records Err("cancelled") for its zone, but run_under turns any cancelled run into Err, so that entry never lands.
Arc::ptr_eq on the recorded raster: the recorded Arc keeps the pointer alive, so there is no reuse (ABA) false match.
Panic safety: taking resets zones_ahead after catch_unwind.
Wasm: the ahead_on_copy closure, RanAheads and ZonesAhead are all cfg(not(wasm32)), and zone_means uses allow(unused_variables) for s.
Non-test code has no unwrap/expect, and zone_rings uses get/ok_or_else.
Security: none found.
Performance: nit, low confidence (impact negligible unless polygons are very large). zone_rings clones the whole polygon (polys.first().cloned()) on every zone read, including on the run here when the copy's answer is taken. That is O(vertices) on the window thread.
Quality:
crates/engine/src/cmd/workflows.rs:663-667 (confidence: high that it is incomplete, low impact): the ON_A_COPY doc lists two kinds of entries, commands whose results are taken (a tool, a model, a batch) and commands that change only what the taking compares by value. raster.spectral's zone reads fit neither kind exactly, since their means are taken. Consider adding them to the list.
docs/user-guide/analysis.md around line 1295 (confidence: high, cosmetic): the reworded sentence runs well past the wrap width of the surrounding paragraph.
AGENTS.md: no new violations. The ON_A_COPY use, the doc comment on the direct-call exception, the cancel-aware reads and the translation rules all match. Test-list note: raster.spectral is not in IN_BACKGROUND, so long_commands_stop_when_cancelled_while_they_run does not need a new entry.
Earlier review threads: 5 threads already exist on this PR. I left all 5 alone. Three were fixed in 1aff5f71 and are resolved. Two were answered by the author and are still open. One is the mismatched-zone read on the window thread, which the author declined to change. The other is the direct-call zone read (assistant, tasks, CLI) on the UI thread. For that one, the doc comment now gives a reason, but the reason is that giving those callers a background path is "their work". That is a deferral rather than a case that the command must stay on the UI thread, so the maintainer may want to decide it explicitly.
Change size
Compared: the whole PR against main (merge base b4d86f8 to PR head 1aff5f7). No trees were truncated.
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Follow-up to #1719 (#1562), from its last review point (github-actions, AGENTS.md › Never hold the window):
raster.spectralwith azoneread the zone's window of cells on the session's thread, so a large zone in a script held the window.raster.spectralis now onON_A_COPY, since it changes nothing outside the session. A script's zone is read on the script's copy, with Run Script's progress and Cancel. It is recorded (ZonesAhead, like a batch's files), and the run here takes it when the raster and the polygon are still the ones that were read; otherwise it reads them again.Docs: the script paragraph and the Spectral Analysis entry in
docs/user-guide/analysis.md.Tests:
a_scripts_spectral_zone_is_read_on_its_copycovers four cases:No visible UI change.
Summary by CodeRabbit