refactor: move spec details into an internal package (#5116)

The spec was something that originally existed to accomodate
transpilers. We later decided transpilers should just use the AST rather
than something internal like the spec and the repl became the only thing
that uses the spec.

This moves the spec to an internal package so it stays as an internal
detail and does not exist as part of the external Go API.

This also removes the ider interface. It didn't appear to be used for
anything other than an implementation inside of the spec, so this just
removes it. The transformations that needed to know the ids of their
parents didn't use the operation ids anyway so it didn't matter.

Author: jsternberg

compile.go

@@ -66,43 +66,23 @@ func functionValue(name string, c CreateOperationSpec, mt semantic.MonoType, sid
 
 var _ = tableSpecKey // So that linter doesn't think tableSpecKey is unused, considering above TODO.
 
-// IDer produces the mapping of table Objects to OperationIDs
-type IDer interface {
-	ID(*TableObject) OperationID
-}
-
-// IDerOpSpec is the interface any operation spec that needs
-// access to OperationIDs in the query spec must implement.
-type IDerOpSpec interface {
-	IDer(ider IDer)
-}
-
 // TableObject represents the value returned by a transformation.
 // As such, it holds the OperationSpec of the transformation it is associated with,
 // and it is a values.Value (and, also, a values.Object).
 // It can be compiled and executed as a flux.Program by using a lang.TableObjectCompiler.
 type TableObject struct {
 	// TODO(Josh): Remove args once the
 	// OperationSpec interface has an Equal method.
-	t       semantic.MonoType
-	args    Arguments
-	Kind    OperationKind
-	Spec    OperationSpec
-	Source  OperationSource
+	t      semantic.MonoType
+	args   Arguments
+	Kind   OperationKind
+	Spec   OperationSpec
+	Source struct {
+		Stack []interpreter.StackEntry
+	}
 	Parents []*TableObject
 }
 
-func (t *TableObject) Operation(ider IDer) *Operation {
-	if iderOpSpec, ok := t.Spec.(IDerOpSpec); ok {
-		iderOpSpec.IDer(ider)
-	}
-
-	return &Operation{
-		ID:     ider.ID(t),
-		Spec:   t.Spec,
-		Source: t.Source,
-	}
-}
 func (t *TableObject) IsNull() bool {
 	return false
 }
@@ -326,17 +306,14 @@ func (f *function) call(ctx context.Context, args interpreter.Arguments) (values
 		return nil, err
 	}
 
-	stack := interpreter.Stack(ctx)
 	t := &TableObject{
-		t:    returnType,
-		args: arguments,
-		Kind: spec.Kind(),
-		Spec: spec,
-		Source: OperationSource{
-			Stack: stack,
-		},
+		t:       returnType,
+		args:    arguments,
+		Kind:    spec.Kind(),
+		Spec:    spec,
 		Parents: a.parents,
 	}
+	t.Source.Stack = interpreter.Stack(ctx)
 	return t, nil
 }
 func (f *function) String() string {

execute/concurrency_quota_test.go

@@ -5,10 +5,10 @@ import (
 	"testing"
 	"time"
 
+	"github.com/influxdata/flux/internal/operation"
 	"github.com/influxdata/flux/plan"
 	"go.uber.org/zap/zaptest"
 
-	"github.com/influxdata/flux"
 	"github.com/influxdata/flux/dependencies/dependenciestest"
 	"github.com/influxdata/flux/dependency"
 	"github.com/influxdata/flux/execute"
@@ -108,7 +108,7 @@ func (rule parallelizeFromTo) Rewrite(ctx context.Context, pn plan.Node) (plan.N
 
 type flagger map[string]interface{}
 
-func compile(fluxText string, now time.Time) (context.Context, *flux.Spec, error) {
+func compile(fluxText string, now time.Time) (context.Context, *operation.Spec, error) {
 	ctx, deps := dependency.Inject(context.Background(), dependenciestest.Default())
 	defer deps.Finish()
 	spec, err := spec.FromScript(ctx, runtime.Default, now, fluxText)

spec.go renamed to internal/operation/spec.go

@@ -1,34 +1,52 @@
-package flux
+package operation
 
 import (
 	"time"
 
+	"github.com/influxdata/flux"
 	"github.com/influxdata/flux/codes"
 	"github.com/influxdata/flux/internal/errors"
+	"github.com/influxdata/flux/interpreter"
 )
 
+// Node denotes a single operation in a query.
+type Node struct {
+	ID     NodeID             `json:"id"`
+	Spec   flux.OperationSpec `json:"spec"`
+	Source NodeSource         `json:"source"`
+}
+
+// NodeSource specifies the source location that created
+// an operation.
+type NodeSource struct {
+	Stack []interpreter.StackEntry `json:"stack"`
+}
+
+// NodeID is a unique ID within a query for the operation.
+type NodeID string
+
 // Spec specifies a query.
 type Spec struct {
-	Operations []*Operation       `json:"operations"`
-	Edges      []Edge             `json:"edges"`
-	Resources  ResourceManagement `json:"resources"`
-	Now        time.Time          `json:"now"`
-
-	sorted   []*Operation
-	children map[OperationID][]*Operation
-	parents  map[OperationID][]*Operation
+	Operations []*Node                 `json:"operations"`
+	Edges      []Edge                  `json:"edges"`
+	Resources  flux.ResourceManagement `json:"resources"`
+	Now        time.Time               `json:"now"`
+
+	sorted   []*Node
+	children map[NodeID][]*Node
+	parents  map[NodeID][]*Node
 }
 
 // Edge is a data flow relationship between a parent and a child
 type Edge struct {
-	Parent OperationID `json:"parent"`
-	Child  OperationID `json:"child"`
+	Parent NodeID `json:"parent"`
+	Child  NodeID `json:"child"`
 }
 
 // Walk calls f on each operation exactly once.
 // The function f will be called on an operation only after
 // all of its parents have already been passed to f.
-func (q *Spec) Walk(f func(o *Operation) error) error {
+func (q *Spec) Walk(f func(o *Node) error) error {
 	if len(q.sorted) == 0 {
 		if err := q.prepare(); err != nil {
 			return err
@@ -53,7 +71,7 @@ func (q *Spec) Validate() error {
 
 // Children returns a list of children for a given operation.
 // If the query is invalid no children will be returned.
-func (q *Spec) Children(id OperationID) []*Operation {
+func (q *Spec) Children(id NodeID) []*Node {
 	if q.children == nil {
 		err := q.prepare()
 		if err != nil {
@@ -65,7 +83,7 @@ func (q *Spec) Children(id OperationID) []*Operation {
 
 // Parents returns a list of parents for a given operation.
 // If the query is invalid no parents will be returned.
-func (q *Spec) Parents(id OperationID) []*Operation {
+func (q *Spec) Parents(id NodeID) []*Node {
 	if q.parents == nil {
 		err := q.prepare()
 		if err != nil {
@@ -91,23 +109,23 @@ func (q *Spec) prepare() error {
 	q.parents = parents
 	q.children = children
 
-	tMarks := make(map[OperationID]bool)
-	pMarks := make(map[OperationID]bool)
+	tMarks := make(map[NodeID]bool)
+	pMarks := make(map[NodeID]bool)
 
 	for _, r := range roots {
 		if err := q.visit(tMarks, pMarks, r); err != nil {
 			return err
 		}
 	}
-	//reverse q.sorted
+	// reverse q.sorted
 	for i, j := 0, len(q.sorted)-1; i < j; i, j = i+1, j-1 {
 		q.sorted[i], q.sorted[j] = q.sorted[j], q.sorted[i]
 	}
 	return nil
 }
 
-func (q *Spec) computeLookup() (map[OperationID]*Operation, error) {
-	lookup := make(map[OperationID]*Operation, len(q.Operations))
+func (q *Spec) computeLookup() (map[NodeID]*Node, error) {
+	lookup := make(map[NodeID]*Node, len(q.Operations))
 	for _, o := range q.Operations {
 		if _, ok := lookup[o.ID]; ok {
 			return nil, errors.Newf(codes.Internal, "found duplicate operation ID %q", o.ID)
@@ -117,13 +135,13 @@ func (q *Spec) computeLookup() (map[OperationID]*Operation, error) {
 	return lookup, nil
 }
 
-func (q *Spec) determineParentsChildrenAndRoots() (parents, children map[OperationID][]*Operation, roots []*Operation, _ error) {
+func (q *Spec) determineParentsChildrenAndRoots() (parents, children map[NodeID][]*Node, roots []*Node, _ error) {
 	lookup, err := q.computeLookup()
 	if err != nil {
 		return nil, nil, nil, err
 	}
-	children = make(map[OperationID][]*Operation, len(q.Operations))
-	parents = make(map[OperationID][]*Operation, len(q.Operations))
+	children = make(map[NodeID][]*Node, len(q.Operations))
+	parents = make(map[NodeID][]*Node, len(q.Operations))
 	for _, e := range q.Edges {
 		// Build children map
 		c, ok := lookup[e.Child]
@@ -150,7 +168,7 @@ func (q *Spec) determineParentsChildrenAndRoots() (parents, children map[Operati
 
 // Depth first search topological sorting of a DAG.
 // https://en.wikipedia.org/wiki/Topological_sorting#Algorithms
-func (q *Spec) visit(tMarks, pMarks map[OperationID]bool, o *Operation) error {
+func (q *Spec) visit(tMarks, pMarks map[NodeID]bool, o *Node) error {
 	id := o.ID
 	if tMarks[id] {
 		return errors.New(codes.Invalid, "found cycle in query")
@@ -173,7 +191,7 @@ func (q *Spec) visit(tMarks, pMarks map[OperationID]bool, o *Operation) error {
 // Functions return the names of all functions used in the plan
 func (q *Spec) Functions() ([]string, error) {
 	funcs := []string{}
-	err := q.Walk(func(o *Operation) error {
+	err := q.Walk(func(o *Node) error {
 		funcs = append(funcs, string(o.Spec.Kind()))
 		return nil
 	})