mirror of https://github.com/docker/docs.git
54 lines
1.4 KiB
Go
54 lines
1.4 KiB
Go
package filter
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import (
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"fmt"
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log "github.com/Sirupsen/logrus"
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"github.com/docker/swarm/cluster"
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"github.com/docker/swarm/scheduler/node"
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)
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// ConstraintFilter selects only nodes that match certain labels.
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type ConstraintFilter struct {
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}
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// Name returns the name of the filter
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func (f *ConstraintFilter) Name() string {
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return "constraint"
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}
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// Filter is exported
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func (f *ConstraintFilter) Filter(config *cluster.ContainerConfig, nodes []*node.Node) ([]*node.Node, error) {
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constraints, err := parseExprs(config.Constraints())
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if err != nil {
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return nil, err
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}
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for _, constraint := range constraints {
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log.Debugf("matching constraint: %s %s %s", constraint.key, OPERATORS[constraint.operator], constraint.value)
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candidates := []*node.Node{}
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for _, node := range nodes {
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switch constraint.key {
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case "node":
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// "node" label is a special case pinning a container to a specific node.
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if constraint.Match(node.ID, node.Name) {
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candidates = append(candidates, node)
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}
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default:
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if constraint.Match(node.Labels[constraint.key]) {
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candidates = append(candidates, node)
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}
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}
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}
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if len(candidates) == 0 {
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if constraint.isSoft {
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continue
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}
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return nil, fmt.Errorf("unable to find a node that satisfies %s%s%s", constraint.key, OPERATORS[constraint.operator], constraint.value)
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}
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nodes = candidates
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}
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return nodes, nil
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}
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