[pkg/ottl] Change OTTL contexts to handle paths with context

.chloggen/change-contexts-to-support-path-with-context.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: pkg/ottl
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: "Change OTTL contexts to properly handle `ottl.Path` with context"
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [29017]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext: "The OTTL contexts have a new option `EnablePathContextNames` to enable support for expressing a statement's context via path names in the statement"
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [api]

pkg/ottl/contexts/internal/metric.go

@@ -11,6 +11,10 @@ import (
 	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/ottl"
 )
 
+const (
+	MetricContextName = "metric"
+)
+
 type MetricContext interface {
 	GetMetric() pmetric.Metric
 }
@@ -29,7 +33,7 @@ var MetricSymbolTable = map[ottl.EnumSymbol]ottl.Enum{
 
 func MetricPathGetSetter[K MetricContext](path ottl.Path[K]) (ottl.GetSetter[K], error) {
 	if path == nil {
-		return nil, FormatDefaultErrorMessage("metric", "metric", "Metric", MetricRef)
+		return nil, FormatDefaultErrorMessage(MetricContextName, MetricContextName, "Metric", MetricRef)
 	}
 	switch path.Name() {
 	case "name":

pkg/ottl/contexts/internal/resource.go

@@ -11,14 +11,18 @@ import (
 	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/ottl"
 )
 
+const (
+	ResourceContextName = "resource"
+)
+
 type ResourceContext interface {
 	GetResource() pcommon.Resource
 	GetResourceSchemaURLItem() SchemaURLItem
 }
 
 func ResourcePathGetSetter[K ResourceContext](path ottl.Path[K]) (ottl.GetSetter[K], error) {
 	if path == nil {
-		return nil, FormatDefaultErrorMessage("resource", "resource", "Resource", ResourceContextRef)
+		return nil, FormatDefaultErrorMessage(ResourceContextName, ResourceContextName, "Resource", ResourceContextRef)
 	}
 	switch path.Name() {
 	case "attributes":

pkg/ottl/contexts/internal/scope.go

@@ -11,14 +11,19 @@ import (
 	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/ottl"
 )
 
+const (
+	InstrumentationScopeContextName = "instrumentation_scope"
+	ScopeContextName                = "scope"
+)
+
 type InstrumentationScopeContext interface {
 	GetInstrumentationScope() pcommon.InstrumentationScope
 	GetScopeSchemaURLItem() SchemaURLItem
 }
 
 func ScopePathGetSetter[K InstrumentationScopeContext](path ottl.Path[K]) (ottl.GetSetter[K], error) {
 	if path == nil {
-		return nil, FormatDefaultErrorMessage("instrumentation_scope", "instrumentation_scope", "Instrumentation Scope", InstrumentationScopeRef)
+		return nil, FormatDefaultErrorMessage(InstrumentationScopeContextName, InstrumentationScopeContextName, "Instrumentation Scope", InstrumentationScopeRef)
 	}
 	switch path.Name() {
 	case "name":

pkg/ottl/contexts/internal/scope_test.go

@@ -334,6 +334,18 @@ func TestScopePathGetSetter(t *testing.T) {
 				s.AppendEmpty().SetEmptySlice().AppendEmpty().SetStr("new")
 			},
 		},
+		{
+			name: "scope with context",
+			path: &TestPath[*instrumentationScopeContext]{
+				C: "scope",
+				N: "name",
+			},
+			orig:   refIS.Name(),
+			newVal: "newname",
+			modified: func(is pcommon.InstrumentationScope) {
+				is.SetName("newname")
+			},
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {

pkg/ottl/contexts/internal/span.go

@@ -18,7 +18,8 @@ import (
 )
 
 const (
-	SpanContextName = "Span"
+	SpanContextName            = "span"
+	SpanContextNameDescription = "Span"
 )
 
 type SpanContext interface {
@@ -39,7 +40,7 @@ var SpanSymbolTable = map[ottl.EnumSymbol]ottl.Enum{
 
 func SpanPathGetSetter[K SpanContext](path ottl.Path[K]) (ottl.GetSetter[K], error) {
 	if path == nil {
-		return nil, FormatDefaultErrorMessage("span", "span", SpanContextName, SpanRef)
+		return nil, FormatDefaultErrorMessage(SpanContextName, SpanContextName, SpanContextNameDescription, SpanRef)
 	}
 	switch path.Name() {
 	case "trace_id":
@@ -48,7 +49,7 @@ func SpanPathGetSetter[K SpanContext](path ottl.Path[K]) (ottl.GetSetter[K], err
 			if nextPath.Name() == "string" {
 				return accessStringTraceID[K](), nil
 			}
-			return nil, FormatDefaultErrorMessage(nextPath.Name(), nextPath.String(), SpanContextName, SpanRef)
+			return nil, FormatDefaultErrorMessage(nextPath.Name(), nextPath.String(), SpanContextNameDescription, SpanRef)
 		}
 		return accessTraceID[K](), nil
 	case "span_id":
@@ -57,7 +58,7 @@ func SpanPathGetSetter[K SpanContext](path ottl.Path[K]) (ottl.GetSetter[K], err
 			if nextPath.Name() == "string" {
 				return accessStringSpanID[K](), nil
 			}
-			return nil, FormatDefaultErrorMessage(nextPath.Name(), nextPath.String(), SpanContextName, SpanRef)
+			return nil, FormatDefaultErrorMessage(nextPath.Name(), nextPath.String(), SpanContextNameDescription, SpanRef)
 		}
 		return accessSpanID[K](), nil
 	case "trace_state":
@@ -72,7 +73,7 @@ func SpanPathGetSetter[K SpanContext](path ottl.Path[K]) (ottl.GetSetter[K], err
 			if nextPath.Name() == "string" {
 				return accessStringParentSpanID[K](), nil
 			}
-			return nil, FormatDefaultErrorMessage(nextPath.Name(), nextPath.String(), SpanContextName, SpanRef)
+			return nil, FormatDefaultErrorMessage(nextPath.Name(), nextPath.String(), SpanContextNameDescription, SpanRef)
 		}
 		return accessParentSpanID[K](), nil
 	case "name":
@@ -86,7 +87,7 @@ func SpanPathGetSetter[K SpanContext](path ottl.Path[K]) (ottl.GetSetter[K], err
 			case "deprecated_string":
 				return accessDeprecatedStringKind[K](), nil
 			default:
-				return nil, FormatDefaultErrorMessage(nextPath.Name(), nextPath.String(), SpanContextName, SpanRef)
+				return nil, FormatDefaultErrorMessage(nextPath.Name(), nextPath.String(), SpanContextNameDescription, SpanRef)
 			}
 		}
 		return accessKind[K](), nil
@@ -123,12 +124,12 @@ func SpanPathGetSetter[K SpanContext](path ottl.Path[K]) (ottl.GetSetter[K], err
 			case "message":
 				return accessStatusMessage[K](), nil
 			default:
-				return nil, FormatDefaultErrorMessage(nextPath.Name(), nextPath.String(), SpanContextName, SpanRef)
+				return nil, FormatDefaultErrorMessage(nextPath.Name(), nextPath.String(), SpanContextNameDescription, SpanRef)
 			}
 		}
 		return accessStatus[K](), nil
 	default:
-		return nil, FormatDefaultErrorMessage(path.Name(), path.String(), SpanContextName, SpanRef)
+		return nil, FormatDefaultErrorMessage(path.Name(), path.String(), SpanContextNameDescription, SpanRef)
 	}
 }
 

pkg/ottl/contexts/ottldatapoint/datapoint.go

@@ -20,7 +20,9 @@ import (
 )
 
 const (
-	contextName = "DataPoint"
+	// Experimental: *NOTE* this constant is subject to change or removal in the future.
+	ContextName            = "datapoint"
+	contextNameDescription = "DataPoint"
 )
 
 var (
@@ -124,6 +126,22 @@ func NewParser(functions map[string]ottl.Factory[TransformContext], telemetrySet
 	return p, nil
 }
 
+// EnablePathContextNames enables the support to path's context names on statements.
+// When this option is configured, all statement's paths must have a valid context prefix,
+// otherwise an error is reported.
+//
+// Experimental: *NOTE* this option is subject to change or removal in the future.
+func EnablePathContextNames() Option {
+	return func(p *ottl.Parser[TransformContext]) {
+		ottl.WithPathContextNames[TransformContext]([]string{
+			ContextName,
+			internal.ResourceContextName,
+			internal.InstrumentationScopeContextName,
+			internal.MetricContextName,
+		})(p)
+	}
+}
+
 type StatementSequenceOption func(*ottl.StatementSequence[TransformContext])
 
 func WithStatementSequenceErrorMode(errorMode ottl.ErrorMode) StatementSequenceOption {
@@ -185,18 +203,23 @@ func (pep *pathExpressionParser) parsePath(path ottl.Path[TransformContext]) (ot
 	if path == nil {
 		return nil, fmt.Errorf("path cannot be nil")
 	}
+	// Higher contexts parsing
+	if path.Context() != "" && path.Context() != ContextName {
+		return pep.parseHigherContextPath(path.Context(), path)
+	}
+	// Backward compatibility with paths without context
+	if path.Context() == "" && (path.Name() == internal.ResourceContextName ||
+		path.Name() == internal.InstrumentationScopeContextName ||
+		path.Name() == internal.MetricContextName) {
+		return pep.parseHigherContextPath(path.Name(), path.Next())
+	}
+
 	switch path.Name() {
 	case "cache":
 		if path.Keys() == nil {
 			return accessCache(), nil
 		}
 		return accessCacheKey(path.Keys()), nil
-	case "resource":
-		return internal.ResourcePathGetSetter[TransformContext](path.Next())
-	case "instrumentation_scope":
-		return internal.ScopePathGetSetter[TransformContext](path.Next())
-	case "metric":
-		return internal.MetricPathGetSetter[TransformContext](path.Next())
 	case "attributes":
 		if path.Keys() == nil {
 			return accessAttributes(), nil
@@ -239,7 +262,7 @@ func (pep *pathExpressionParser) parsePath(path ottl.Path[TransformContext]) (ot
 			case "bucket_counts":
 				return accessPositiveBucketCounts(), nil
 			default:
-				return nil, internal.FormatDefaultErrorMessage(nextPath.Name(), path.String(), contextName, internal.DataPointRef)
+				return nil, internal.FormatDefaultErrorMessage(nextPath.Name(), path.String(), contextNameDescription, internal.DataPointRef)
 			}
 		}
 		return accessPositive(), nil
@@ -252,14 +275,31 @@ func (pep *pathExpressionParser) parsePath(path ottl.Path[TransformContext]) (ot
 			case "bucket_counts":
 				return accessNegativeBucketCounts(), nil
 			default:
-				return nil, internal.FormatDefaultErrorMessage(nextPath.Name(), path.String(), contextName, internal.DataPointRef)
+				return nil, internal.FormatDefaultErrorMessage(nextPath.Name(), path.String(), contextNameDescription, internal.DataPointRef)
 			}
 		}
 		return accessNegative(), nil
 	case "quantile_values":
 		return accessQuantileValues(), nil
 	default:
-		return nil, internal.FormatDefaultErrorMessage(path.Name(), path.String(), contextName, internal.DataPointRef)
+		return nil, internal.FormatDefaultErrorMessage(path.Name(), path.String(), contextNameDescription, internal.DataPointRef)
+	}
+}
+
+func (pep *pathExpressionParser) parseHigherContextPath(context string, path ottl.Path[TransformContext]) (ottl.GetSetter[TransformContext], error) {
+	switch context {
+	case internal.ResourceContextName:
+		return internal.ResourcePathGetSetter(path)
+	case internal.InstrumentationScopeContextName:
+		return internal.ScopePathGetSetter(path)
+	case internal.MetricContextName:
+		return internal.MetricPathGetSetter(path)
+	default:
+		var fullPath string
+		if path != nil {
+			fullPath = path.String()
+		}
+		return nil, internal.FormatDefaultErrorMessage(context, fullPath, contextNameDescription, internal.DataPointRef)
 	}
 }