mirror of https://github.com/docker/docs.git
51 lines
1.2 KiB
Go
51 lines
1.2 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/samalba/dockerclient"
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)
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// AffinityFilter selects only nodes based on other containers on the node.
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type AffinityFilter struct {
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}
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func (f *AffinityFilter) Filter(config *dockerclient.ContainerConfig, nodes []*cluster.Node) ([]*cluster.Node, error) {
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affinities := extractEnv("affinity", config.Env)
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for k, v := range affinities {
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log.Debugf("matching affinity: %s=%s", k, v)
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candidates := []*cluster.Node{}
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for _, node := range nodes {
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switch k {
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case "container":
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for _, container := range node.Containers() {
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// "node" label is a special case pinning a container to a specific node.
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if match(v, container.Id) || match(v, container.Names[0]) {
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candidates = append(candidates, node)
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break
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}
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}
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case "image":
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//TODO use cache
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images, err := node.ListImages()
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if err != nil {
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break
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}
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for _, image := range images {
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if match(v, image) {
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candidates = append(candidates, node)
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break
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}
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}
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}
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}
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if len(candidates) == 0 {
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return nil, fmt.Errorf("unable to find a node that satisfies %s == %s", k, v)
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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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