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rules.go
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rules.go
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package influxdb
import (
"context"
"github.com/influxdata/flux/dependencies/influxdb"
"github.com/influxdata/flux/plan"
"github.com/influxdata/flux/stdlib/universe"
)
type FromRemoteRule struct{}
func (p FromRemoteRule) Name() string {
return "influxdata/influxdb.FromRemoteRule"
}
func (p FromRemoteRule) Pattern() plan.Pattern {
return plan.MultiSuccessor(FromKind)
}
func (p FromRemoteRule) Rewrite(ctx context.Context, node plan.Node) (plan.Node, bool, error) {
spec := node.ProcedureSpec().(*FromProcedureSpec)
if spec.Host == nil {
return node, false, nil
}
config := influxdb.Config{
Bucket: spec.Bucket,
}
if spec.Org != nil {
config.Org = *spec.Org
}
if spec.Host != nil {
config.Host = *spec.Host
}
if spec.Token != nil {
config.Token = *spec.Token
}
return plan.CreateUniquePhysicalNode(ctx, "fromRemote", &FromRemoteProcedureSpec{
Config: config,
}), true, nil
}
type MergeRemoteRangeRule struct{}
func (p MergeRemoteRangeRule) Name() string {
return "influxdata/influxdb.MergeRemoteRangeRule"
}
func (p MergeRemoteRangeRule) Pattern() plan.Pattern {
return plan.MultiSuccessor(universe.RangeKind, plan.SingleSuccessor(FromRemoteKind))
}
func (p MergeRemoteRangeRule) Rewrite(ctx context.Context, node plan.Node) (plan.Node, bool, error) {
fromNode := node.Predecessors()[0]
fromSpec := fromNode.ProcedureSpec().(*FromRemoteProcedureSpec)
if !fromSpec.Bounds.IsEmpty() {
return node, false, nil
}
rangeSpec := node.ProcedureSpec().(*universe.RangeProcedureSpec)
newFromSpec := fromSpec.Copy().(*FromRemoteProcedureSpec)
newFromSpec.Bounds = rangeSpec.Bounds
n, err := plan.MergeToPhysicalNode(node, fromNode, newFromSpec)
if err != nil {
return nil, false, err
}
return n, true, nil
}
type MergeRemoteFilterRule struct{}
func (p MergeRemoteFilterRule) Name() string {
return "influxdata/influxdb.MergeRemoteFilterRule"
}
func (p MergeRemoteFilterRule) Pattern() plan.Pattern {
return plan.MultiSuccessor(universe.FilterKind, plan.SingleSuccessor(FromRemoteKind))
}
func (p MergeRemoteFilterRule) Rewrite(ctx context.Context, node plan.Node) (plan.Node, bool, error) {
fromNode := node.Predecessors()[0]
fromSpec := fromNode.ProcedureSpec().(*FromRemoteProcedureSpec)
if fromSpec.Bounds.IsEmpty() {
return node, false, nil
}
filterSpec := node.ProcedureSpec().(*universe.FilterProcedureSpec)
// Attempt to construct the new from procedure spec and see
// it we can create a reader using it.
fromSpec = fromSpec.Copy().(*FromRemoteProcedureSpec)
fromSpec.PredicateSet = append(fromSpec.PredicateSet, influxdb.Predicate{
ResolvedFunction: filterSpec.Fn,
KeepEmpty: filterSpec.KeepEmptyTables,
})
provider := influxdb.GetProvider(ctx)
if _, err := provider.ReaderFor(ctx, fromSpec.Config, fromSpec.Bounds, fromSpec.PredicateSet); err != nil {
// TODO(jsternberg): It might be possible to push part of
// a predicate and this is done in influxdb. Update this section
// to also try and split the predicate into multiple sets
// so we can partially push down a filter.
return node, false, nil
}
n, err := plan.MergeToPhysicalNode(node, fromNode, fromSpec)
if err != nil {
return nil, false, err
}
return n, true, nil
}
type BucketsRemoteRule struct{}
func (p BucketsRemoteRule) Name() string {
return "influxdata/influxdb.BucketsRemoteRule"
}
func (p BucketsRemoteRule) Pattern() plan.Pattern {
return plan.MultiSuccessor(BucketsKind)
}
func (p BucketsRemoteRule) Rewrite(ctx context.Context, node plan.Node) (plan.Node, bool, error) {
spec := node.ProcedureSpec().(*BucketsProcedureSpec)
if spec.Host == nil {
return node, false, nil
}
return plan.CreateUniquePhysicalNode(ctx, "bucketsRemote", &BucketsRemoteProcedureSpec{
BucketsProcedureSpec: spec,
}), true, nil
}
// DefaultFromAttributes is used to inject default attributes
// for the various from attributes.
//
// This rule is not added by default. Each process must fill
// out the suitable defaults and add the rule on startup.
type DefaultFromAttributes struct {
Org *NameOrID
Host *string
Token *string
}
func (d DefaultFromAttributes) Name() string {
return "influxdata/influxdb.DefaultFromAttributes"
}
func (d DefaultFromAttributes) Pattern() plan.Pattern {
return plan.AnyMultiSuccessor()
}
func (d DefaultFromAttributes) Rewrite(ctx context.Context, n plan.Node) (plan.Node, bool, error) {
spec, ok := n.ProcedureSpec().(ProcedureSpec)
if !ok {
return n, false, nil
}
changed := false
if spec.GetOrg() == nil && d.Org != nil {
spec.SetOrg(d.Org)
changed = true
}
if spec.GetToken() == nil && d.Token != nil {
spec.SetToken(d.Token)
changed = true
}
if spec.GetHost() == nil && d.Host != nil {
spec.SetHost(d.Host)
changed = true
}
return n, changed, nil
}