forked from TrueCloudLab/distribution
137 lines
3.4 KiB
Go
137 lines
3.4 KiB
Go
package client
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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/distribution/manifest"
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)
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// simultaneousLayerPushWindow is the size of the parallel layer push window.
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// A layer may not be pushed until the layer preceeding it by the length of the
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// push window has been successfully pushed.
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const simultaneousLayerPushWindow = 4
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type pushFunction func(fsLayer manifest.FSLayer) error
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// Push implements a client push workflow for the image defined by the given
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// name and tag pair, using the given ObjectStore for local manifest and layer
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// storage
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func Push(c Client, objectStore ObjectStore, name, tag string) error {
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manifest, err := objectStore.Manifest(name, tag)
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if err != nil {
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log.WithFields(log.Fields{
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"error": err,
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"name": name,
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"tag": tag,
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}).Info("No image found")
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return err
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}
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errChans := make([]chan error, len(manifest.FSLayers))
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for i := range manifest.FSLayers {
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errChans[i] = make(chan error)
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}
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cancelCh := make(chan struct{})
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// Iterate over each layer in the manifest, simultaneously pushing no more
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// than simultaneousLayerPushWindow layers at a time. If an error is
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// received from a layer push, we abort the push.
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for i := 0; i < len(manifest.FSLayers)+simultaneousLayerPushWindow; i++ {
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dependentLayer := i - simultaneousLayerPushWindow
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if dependentLayer >= 0 {
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err := <-errChans[dependentLayer]
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if err != nil {
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log.WithField("error", err).Warn("Push aborted")
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close(cancelCh)
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return err
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}
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}
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if i < len(manifest.FSLayers) {
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go func(i int) {
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select {
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case errChans[i] <- pushLayer(c, objectStore, name, manifest.FSLayers[i]):
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case <-cancelCh: // recv broadcast notification about cancelation
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}
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}(i)
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}
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}
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err = c.PutImageManifest(name, tag, manifest)
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if err != nil {
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log.WithFields(log.Fields{
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"error": err,
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"manifest": manifest,
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}).Warn("Unable to upload manifest")
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return err
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}
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return nil
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}
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func pushLayer(c Client, objectStore ObjectStore, name string, fsLayer manifest.FSLayer) error {
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log.WithField("layer", fsLayer).Info("Pushing layer")
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layer, err := objectStore.Layer(fsLayer.BlobSum)
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if err != nil {
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log.WithFields(log.Fields{
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"error": err,
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"layer": fsLayer,
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}).Warn("Unable to read local layer")
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return err
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}
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layerReader, err := layer.Reader()
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if err != nil {
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log.WithFields(log.Fields{
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"error": err,
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"layer": fsLayer,
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}).Warn("Unable to read local layer")
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return err
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}
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defer layerReader.Close()
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if layerReader.CurrentSize() != layerReader.Size() {
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log.WithFields(log.Fields{
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"layer": fsLayer,
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"currentSize": layerReader.CurrentSize(),
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"size": layerReader.Size(),
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}).Warn("Local layer incomplete")
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return fmt.Errorf("Local layer incomplete")
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}
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length, err := c.BlobLength(name, fsLayer.BlobSum)
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if err != nil {
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log.WithFields(log.Fields{
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"error": err,
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"layer": fsLayer,
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}).Warn("Unable to check existence of remote layer")
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return err
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}
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if length >= 0 {
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log.WithField("layer", fsLayer).Info("Layer already exists")
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return nil
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}
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location, err := c.InitiateBlobUpload(name)
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if err != nil {
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log.WithFields(log.Fields{
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"error": err,
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"layer": fsLayer,
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}).Warn("Unable to upload layer")
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return err
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}
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err = c.UploadBlob(location, layerReader, int(layerReader.CurrentSize()), fsLayer.BlobSum)
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if err != nil {
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log.WithFields(log.Fields{
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"error": err,
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"layer": fsLayer,
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}).Warn("Unable to upload layer")
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return err
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}
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return nil
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}
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