feat(karta-wasm): expose the Karta engine to the Headlamp plugin - #303
feat(karta-wasm): expose the Karta engine to the Headlamp plugin#303moshe-runai wants to merge 2 commits into
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Wires pkg/tree, pkg/resource, pkg/instructions, and pkg/catalog directly
into a WASM module (karta-wasm/) exposed to the Headlamp plugin as a single
window.karta object: buildTree, attributePods, evaluatePhases, and
listCatalog, each returning a {data, error} JSON envelope. Pod attribution
returns a flat classification (component + instance per pod index) rather
than a pre-spliced tree, since attaching a classified pod to a tree the
caller already holds is plain data plumbing that does not need Go.
On the plugin side, adds headlamp-plugin/src/lib/karta/: karta.ts (WASM
module loading), karta-util.ts (typed JSON-encode/envelope-decode wrappers),
karta.types.ts (wire types mirroring the real Go marshal output, including
pkg/tree's un-tagged PascalCase shape), and an index.ts barrel export.
Testing is split by what each layer can catch:
- karta-wasm/*_test.go exercise the js.FuncOf bindings directly against
real Karta definitions, running via Go's Node-based wasm test runner
(GOOS=js GOARCH=wasm go test -exec=.../go_js_wasm_exec).
- karta-util.test.ts calls the real compiled karta.wasm end to end (no
mocking of Go's output), so a change to what pkg/tree/pkg/resource/
pkg/instructions/pkg/catalog actually return breaks this test, not just
a stale mock.
- karta.test.ts covers the loader itself: script injection via
ApiProxy-fetched blobs, and the instantiateStreaming failure path
(logs and rejects without ever calling go.run).
Refs #302
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Signed-off-by: moshe.pinhasi <moshe.pinhasi@run.ai>
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Included review availability: Your plan provides up to 12 included reviews per hour; 11 remain after this review. WalkthroughThe change replaces the former WASM engine with ChangesKarta WASM integration
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to The loader can fail to initialize Karta when the response uses an unexpected content type, creating a bounded runtime availability risk; the PR is mergeable with explicit owner awareness or follow-up. Sequence Diagram(s)sequenceDiagram
participant HeadlampPlugin
participant kartaUtil
participant getKartaEngine
participant windowKarta
participant KartaWASM
HeadlampPlugin->>kartaUtil: request Karta data
kartaUtil->>getKartaEngine: load the engine
getKartaEngine->>windowKarta: detect the populated export
kartaUtil->>windowKarta: invoke an engine operation
windowKarta->>KartaWASM: execute the binding
KartaWASM-->>windowKarta: return an envelope
windowKarta-->>kartaUtil: return the response
Suggested reviewers: Poem
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 2📝 Generate docstrings 💡
🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 1
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Inline comments:
In `@headlamp-plugin/src/lib/karta/karta.ts`:
- Around line 105-108: Update getKartaEngine’s WASM instantiation flow to try
WebAssembly.instantiateStreaming with wasmResp.clone(), then fall back to
awaiting wasmResp.arrayBuffer() and using WebAssembly.instantiate when streaming
rejects. Preserve the existing error propagation for failures after both
attempts, and update the related test to cover responses without the WASM
Content-Type.
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📒 Files selected for processing (19)
.gitignoreMakefileheadlamp-plugin/README.mdheadlamp-plugin/package.jsonheadlamp-plugin/src/index.tsxheadlamp-plugin/src/lib/karta/index.tsheadlamp-plugin/src/lib/karta/karta-util.test.tsheadlamp-plugin/src/lib/karta/karta-util.tsheadlamp-plugin/src/lib/karta/karta.test.tsheadlamp-plugin/src/lib/karta/karta.tsheadlamp-plugin/src/lib/karta/karta.types.tskarta-wasm/bindings.gokarta-wasm/bindings_test.gokarta-wasm/codec.gokarta-wasm/codec_test.gokarta-wasm/go.modkarta-wasm/main.gowasm-engine/go.modwasm-engine/main.go
💤 Files with no reviewable changes (2)
- wasm-engine/go.mod
- wasm-engine/main.go
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Matches the plugin's camelCase file naming convention. Refs #302 Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Signed-off-by: moshe.pinhasi <moshe.pinhasi@run.ai>
| error: string | null; | ||
| } | ||
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| export interface KartaEngine { |
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if you rename from engine to karta - I would change the interface to karta too or kartaWasm
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ok, renamed to kartaWasm
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| function isKartaLoaded(karta?: KartaEngine): karta is KartaEngine { | ||
| return !!karta && Object.keys(karta).length > 0; |
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why if not undefined is not enough?
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it can be enough. changed
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| export interface KartaEngine { | ||
| version: VersionFn; | ||
| buildTree(definitionJSON: string, workloadJSON: string): Envelope; |
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why to work with string json and not object ? e.g [key: string]: any;
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| export async function buildTree(definition: Karta, workload: Workload): Promise<WorkloadTree> { | ||
| const engine = await getKartaEngine(); | ||
| return unwrap(engine.buildTree(JSON.stringify(definition), JSON.stringify(workload)), { |
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note that you per call you serialize to json and back to object - right now I guess it's really brings performance issues but just I want to make sure you aware of it - another option would be something like
const h = engine.load(JSON.stringify(definition), JSON.stringify(workload)); // returns an int handle
engine.buildTree(h);
engine.evaluatePhases(h);
engine.release(h);
| "github.com/run-ai/karta/pkg/tree" | ||
| ) | ||
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| type PodAttribution struct { |
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I would call PodComponentMatch
| return encodeEnvelope(nil, fmt.Errorf("failed to unmarshal definition: %w", err)) | ||
| } | ||
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| factory, err := decodeFactory(definitionJSON, workloadJSON) |
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doesn't really make sense that you pass definitionJSON if above you convert it from json to v1alpha1.Karta
I think you should on the top of the function decode definitionJSON and workloadJSON and use directly the karta functions from that point
| return encodeEnvelope(nil, fmt.Errorf("failed to build structure summary: %w", err)) | ||
| } | ||
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| var pods []corev1.Pod |
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consider extracting all decodes to function e.g
decodeKartaDefinition
decodeWorkload
decodePodsArr
| } | ||
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| instanceKey, err := instructions.InferPodComponentInstance(ctx, querier, componentName, factory) | ||
| if err != nil { |
| return encodeEnvelope(attributions, nil) | ||
| } | ||
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| func jsEvaluatePhases(_ js.Value, args []js.Value) any { |
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as mentioned not sure you need this - you could do this on the js side instead of the wasm part (you use here the tree and extract the phase
4 participants
What does this PR do?
Wires
pkg/tree,pkg/resource,pkg/instructions, andpkg/catalogdirectly into a WASM module (karta-wasm/) exposed to the Headlamp plugin as a singlewindow.kartaobject:buildTree(definition, workload)— callstree.Buildas-is, returns the realtree.WorkloadTreeattributePods(definition, workload, pods)— classifies each pod to a(component, instance)pair viapkg/instructions' jq-based matching; returns a flat classification rather than a pre-spliced tree, since splicing a classified pod into a tree the caller already holds is plain data plumbing that doesn't need GoevaluatePhases(definition, workload)— reusestree.Build's own root-status computationlistCatalog()— exposes the embedded catalog (pkg/catalog)Every binding returns a
{data, error}JSON envelope.On the plugin side, adds
headlamp-plugin/src/lib/karta/:karta.ts— WASM module loading (script injection viaApiProxy,WebAssembly.instantiateStreaming)karta-util.ts— typed JSON-encode/envelope-decode wrappers around the raw bindingskarta.types.ts— wire types mirroring the real Go marshal output (includingpkg/tree's un-tagged, PascalCase shape — deliberately not reshaped in Go)index.ts— barrel exportTesting strategy
karta-wasm/*_test.go— exercise thejs.FuncOfbindings directly against real Karta definitions, via Go's Node-based wasm test runner (GOOS=js GOARCH=wasm go test -exec=.../go_js_wasm_exec)karta-util.test.ts— calls the real compiledkarta.wasmend to end, no mocking of Go's output, so a change to whatpkg/tree/pkg/resource/pkg/instructions/pkg/catalogactually return breaks this test, not just a stale mockkarta.test.ts— covers the loader: script injection, and theinstantiateStreamingfailure path (logs and rejects without ever callinggo.run)Related issue(s)
Refs #302
Checklist
git commit -s)make checkfor the root/cli modules;karta-wasmandheadlamp-pluginverified separately — see note below)Note on
make check:karta-wasmandheadlamp-pluginare not yet wired intomake check(pre-existing gap, not introduced by this PR). Verified separately:GOOS=js GOARCH=wasm go build/vet/test+golangci-lintforkarta-wasm, andmake headlamp-plugin-build(lint/tsc/test/build) for the plugin.Summary by CodeRabbit