Bryan Boreham
ee7dac9e28
Make clear that they come from the IP allocator, and reduce repetition in the text. Also include the nickname for other peer, if known.
80 lines
2.1 KiB
Go
80 lines
2.1 KiB
Go
package ipam
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import (
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"fmt"
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"github.com/weaveworks/weave/ipam/address"
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"github.com/weaveworks/weave/router"
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)
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type claim struct {
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resultChan chan<- error
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hasBeenCancelled func() bool
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ident string
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addr address.Address
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}
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// Try returns true for success (or failure), false if we need to try again later
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func (c *claim) Try(alloc *Allocator) bool {
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if (c.hasBeenCancelled)() {
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c.Cancel()
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return true
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}
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if !alloc.ring.Contains(c.addr) {
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// Address not within our universe; assume user knows what they are doing
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alloc.infof("Ignored address %s claimed by %s - not in our universe\n", c.addr, c.ident)
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c.resultChan <- nil
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return true
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}
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// If our ring doesn't know, it must be empty. We will have initiated the
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// bootstrap of the ring, so wait until we find some owner for this
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// range (might be us).
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owner := alloc.ring.Owner(c.addr)
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if owner == router.UnknownPeerName {
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alloc.infof("Ring is empty; will try later.\n", c.addr, owner)
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return false
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}
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if owner != alloc.ourName {
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name, found := alloc.nicknames[owner]
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if found {
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name = " (" + name + ")"
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}
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c.resultChan <- fmt.Errorf("address %s is owned by other peer %s%s", c.addr.String(), owner, name)
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return true
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}
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// We are the owner, check we haven't given it to another container
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existingIdent := alloc.findOwner(c.addr)
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if existingIdent == c.ident {
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// same identifier is claiming same address; that's OK
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c.resultChan <- nil
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return true
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}
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if existingIdent == "" {
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err := alloc.space.Claim(c.addr)
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if err != nil {
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c.resultChan <- err
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return true
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}
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alloc.addOwned(c.ident, c.addr)
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c.resultChan <- nil
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return true
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}
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// Addr already owned by container on this machine
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c.resultChan <- fmt.Errorf("address %s is already owned by %s", c.addr.String(), existingIdent)
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return true
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}
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func (c *claim) Cancel() {
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c.resultChan <- fmt.Errorf("Operation cancelled.")
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}
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func (c *claim) String() string {
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return fmt.Sprintf("Claim %s -> %s", c.ident, c.addr.String())
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}
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func (c *claim) ForContainer(ident string) bool {
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return c.ident == ident
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}
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