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OTTL Playground Autocomplete Implementation Summary
The implementation adds version-accurate OTTL (OpenTelemetry Transformation Language) autocomplete, validation, and IDE-like features to the ottl-playground web application. The features adapt automatically based on which collector version is selected. Architecture pkg/ottl/metadata/ # Upstream-ready metadata extraction * metadata.go # Core types: FunctionInfo, ParameterInfo, PathInfo, EnumInfo * introspect.go # Reflection-based factory introspection * functions.go # Function extraction from StandardFuncs registry * contexts.go # Context paths and enums (log, span, metric, etc.) wasm/ * main.go # Added 6 new WASM exports * internal/metadata.go # Bridge between pkg/ottl/metadata and WASM * internal/validator.go # Native OTTL parser validation dispatcher * internal/validator_ptr.go # Validators for OTTL v0.142.0+ (pointer contexts) * internal/validator_noptr.go # Validators for older OTTL versions * internal/completion_context.go # Lexer-based completion context detection web/src/components/ * ottl-completion.js # CodeMirror 6 extensions * panels/config-panel.js # Integrates extensions into editor * playground.js # Clears cache on version change Features Implemented 1. Autocompletion - Function completions with parameter snippets - Context-aware path completions (body, attributes, trace_id, etc.) - Enum completions (SEVERITY_NUMBER_*, SPAN_KIND_*, etc.) - Triggers: Cmd+., Alt+Space, or typing 2. Signature Help - Shows function signature while typing arguments - Highlights current parameter - Updates as cursor moves between arguments 3. Validation/Linting - Uses native OTTL parsers (ottllog.NewParser, etc.) - Real-time squiggly underlines for errors - Accurate error positioning within statements - Context-aware (log, span, metric, datapoint, resource, scope) 4. Hover Documentation - Function hover: signature, parameters, editor vs converter - Path hover: type, description, key support - Enum hover: name and numeric value 5. Go-to-Definition - Cmd/Ctrl+Click on function names - Opens OTTL documentation on GitHub Version Accuracy All metadata is extracted at WASM compile time via reflection: // pkg/ottl/metadata/functions.go func ExtractStandardFunctions[K any]() []FunctionInfo { factories := ottlfuncs.StandardFuncs[K]() // Version-specific! return ExtractAndSortFunctions(factories) } WASM Exports // Available on window after WASM loads window.getOTTLFunctions() // All functions with parameters window.getContextPaths(context) // Paths for log/span/metric/etc. window.getContextEnums(context) // Enums for the context window.getOTTLMetadata() // Complete metadata bundle window.validateStatements(config, dataType, payload, executor) window.getCompletionContext(statement) // Lexer-based cursor context Multi-Version Support Tested with two WASM binaries: - ottlplayground-v0.138.0.wasm (92 functions) - ottlplayground-v0.125.0.wasm (82 functions) Usage Flow 1. User selects version from dropdown 2. Corresponding WASM binary loads 3. clearOTTLMetadataCache() called 4. On first completion request, metadata fetched from WASM 5. Functions/paths/enums reflect exact version capabilities 6. Validation uses native parsers from that version
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‎.github/workflows/ci.yml‎

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@@ -24,4 +24,4 @@ jobs:
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- name: Build
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run: make build-web build-wasm
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- name: Run Go Tests
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run: go test -v ./...
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run: go test -tags ottl_ptr -v ./...

‎Makefile‎

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@@ -3,28 +3,42 @@ GO_BUILD_LDFLAGS?="-s -w"
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WEB_OUTPUT_DIR?=../web/public
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WASM_OUTPUT_DIR?=../web/public/wasm
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# Versions to build (latest first)
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# Note: v0.125.0 not supported due to missing ProfileStatements in transformprocessor
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WASM_VERSIONS?=v0.142.0 v0.138.0
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.PHONY: clean
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clean:
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rm -rf web/node_modules
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rm -rf web/public/wasm
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rm -f web/public/bundle.js
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rm -f web/public/bundle.js.map
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.PHONY: build-test-server
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build-build-test-server:
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CGO_ENABLED=0 $(GOCMD) build -ldflags $(GO_BUILD_LDFLAGS) -o server
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.PHONY: build-web
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build-web:
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cd web; npm install; npm run build
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.PHONY: update-wasm-exec
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update-wasm-exec:
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cp "$(shell go env GOROOT)/misc/wasm/wasm_exec.js" web/src/wasm_exec.js || cp "$(shell go env GOROOT)/lib/wasm/wasm_exec.js" web/src/wasm_exec.js || true
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.PHONY: validate-registered-versions
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validate-registered-versions:
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$(GOCMD) run ci-tools/main.go validate-registered-versions
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.PHONY: build-wasm
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build-wasm:
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$(eval PROCESSORS_VERSION ?= $(shell $(GOCMD) run ci-tools/main.go get-version))
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$(eval BUILD_TAGS := $(shell echo "$(PROCESSORS_VERSION)" | sed 's/v//' | awk -F. '{if ($$1 > 0 || ($$1 == 0 && $$2 >= 142)) print "-tags ottl_ptr"}'))
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$(GOCMD) run ci-tools/main.go generate-constants -version=$(PROCESSORS_VERSION)
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cd wasm; GOARCH=wasm GOOS=js $(GOCMD) build $(BUILD_TAGS) -trimpath -ldflags $(GO_BUILD_LDFLAGS) -o $(WASM_OUTPUT_DIR)/ottlplayground-$(PROCESSORS_VERSION).wasm
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.PHONY: build-unregistered-versions
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build-unregistered-versions:
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$(eval PROCESSORS_VERSIONS ?= $(shell $(GOCMD) run ci-tools/main.go get-unregistered-versions))
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for v in $(PROCESSORS_VERSIONS); do \
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export PROCESSORS_VERSION=$$v ; \
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$(MAKE) update-processor-version && $(MAKE) build-wasm && $(MAKE) register-version ; \
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.PHONY: build-all-wasm
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build-all-wasm:
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@for v in $(WASM_VERSIONS); do \
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echo "Building WASM for $$v..."; \
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PROCESSORS_VERSION=$$v $(MAKE) update-processor-version && \
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PROCESSORS_VERSION=$$v $(MAKE) build-wasm && \
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PROCESSORS_VERSION=$$v $(MAKE) register-version || exit 1; \
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done
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@echo "Restoring to latest version..."
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PROCESSORS_VERSION=$(firstword $(WASM_VERSIONS)) $(MAKE) update-processor-version
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.PHONY: update-processor-version
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update-processor-version:
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COLLECTOR_DEPENDENCIES=$$($(GOCMD) mod graph | grep $$FIRST_PROCESSOR | grep "go.opentelemetry.io/collector/" | awk '{print $$2}' | sort -u); \
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COLLECTOR_PARAMS=""; \
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for DEP in $$COLLECTOR_DEPENDENCIES; do \
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DEP_NAME=$$(echo $$DEP | cut -d'@' -f1); \
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DEP_VERSION=$$(echo $$DEP | cut -d'@' -f2); \
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if ! $(GOCMD) list -m -json $$DEP_NAME | grep -q "\"Indirect\":true"; then \
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COLLECTOR_PARAMS="$$DEP_NAME@$$DEP_VERSION $$COLLECTOR_PARAMS"; \
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fi; \
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done; \
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$(GOCMD) get $$COLLECTOR_PARAMS;
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DEP_NAME=$$(echo $$DEP | cut -d'@' -f1); \
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DEP_VERSION=$$(echo $$DEP | cut -d'@' -f2); \
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if ! $(GOCMD) list -m -json $$DEP_NAME | grep -q "\"Indirect\":true"; then \
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COLLECTOR_PARAMS="$$DEP_NAME@$$DEP_VERSION $$COLLECTOR_PARAMS"; \
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fi; \
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done; \
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$(GOCMD) get $$COLLECTOR_PARAMS;
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$(MAKE) tidy
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.PHONY: build-wasm
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build-wasm:
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$(eval PROCESSORS_VERSION ?= $(shell $(GOCMD) run ci-tools/main.go get-version))
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$(GOCMD) run ci-tools/main.go generate-constants -version=$(PROCESSORS_VERSION)
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cd wasm; GOARCH=wasm GOOS=js $(GOCMD) build -ldflags $(GO_BUILD_LDFLAGS) -o $(WASM_OUTPUT_DIR)/ottlplayground-$(PROCESSORS_VERSION).wasm
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.PHONY: register-version
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register-version:
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$(eval PROCESSORS_VERSION ?= $(shell go run ci-tools/main.go get-version))
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$(eval PROCESSORS_VERSION ?= $(shell $(GOCMD) run ci-tools/main.go get-version))
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$(GOCMD) run ci-tools/main.go register-wasm -version=$(PROCESSORS_VERSION)
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.PHONY: build-web
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build-web:
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cd web; npm install; npm run build
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.PHONY: update-wasm-exec
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update-wasm-exec:
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cp "$(shell go env GOROOT)/misc/wasm/wasm_exec.js" web/src/wasm_exec.js || cp "$(shell go env GOROOT)/lib/wasm/wasm_exec.js" web/src/wasm_exec.js || true
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.PHONY: build
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build: update-wasm-exec build-web build-wasm register-version
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build: update-wasm-exec build-web build-wasm
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.PHONY: build-all
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build-all: update-wasm-exec build-web build-all-wasm
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.PHONY: fmt
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fmt:
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gofmt -w -s ./
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gofmt -w -s ./
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.PHONY: tidy
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tidy:
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rm -fr go.sum
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$(GOCMD) mod tidy -compat=1.22.0
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$(GOCMD) mod tidy -compat=1.22.0

‎go.mod‎

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go 1.24.0
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require (
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github.com/alecthomas/participle/v2 v2.1.4
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github.com/go-viper/mapstructure/v2 v2.4.0
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github.com/open-telemetry/opentelemetry-collector-contrib/pkg/ottl v0.143.0
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github.com/open-telemetry/opentelemetry-collector-contrib/processor/filterprocessor v0.143.0
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github.com/open-telemetry/opentelemetry-collector-contrib/processor/transformprocessor v0.143.0
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github.com/stretchr/testify v1.11.1
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)
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require (
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github.com/alecthomas/participle/v2 v2.1.4 // indirect
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github.com/antchfx/xmlquery v1.5.0 // indirect
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github.com/antchfx/xpath v1.3.5 // indirect
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github.com/cespare/xxhash/v2 v2.3.0 // indirect
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github.com/open-telemetry/opentelemetry-collector-contrib/internal/coreinternal v0.143.0 // indirect
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github.com/open-telemetry/opentelemetry-collector-contrib/internal/filter v0.143.0 // indirect
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github.com/open-telemetry/opentelemetry-collector-contrib/internal/pdatautil v0.143.0 // indirect
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github.com/open-telemetry/opentelemetry-collector-contrib/pkg/ottl v0.143.0 // indirect
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github.com/open-telemetry/opentelemetry-collector-contrib/pkg/pdatautil v0.143.0 // indirect
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github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
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github.com/stretchr/objx v0.5.2 // indirect

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