Bryan Boreham
3cd1a17c23
Using the Ring CRDT and Weave gossip, provides an interface for the weave script to allocate IP addresses in `weave run`, `weave start` and `weave expose`. See docs/ipam.md for implementation details, and site/features.md for user-visible changes.
59 lines
1.3 KiB
Go
59 lines
1.3 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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)
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type allocateResult struct {
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addr address.Address
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err error
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}
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type allocate struct {
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resultChan chan<- allocateResult
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hasBeenCancelled func() bool
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ident string
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}
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// Try returns true if the request is completed, false if pending
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func (g *allocate) Try(alloc *Allocator) bool {
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if g.hasBeenCancelled() {
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g.Cancel()
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return true
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}
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// If we have previously stored an address for this container, return it.
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if addr, found := alloc.owned[g.ident]; found {
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g.resultChan <- allocateResult{addr, nil}
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return true
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}
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if ok, addr := alloc.space.Allocate(); ok {
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alloc.debugln("Allocated", addr, "for", g.ident)
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alloc.addOwned(g.ident, addr)
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g.resultChan <- allocateResult{addr, nil}
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return true
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}
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// out of space
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if donor, err := alloc.ring.ChoosePeerToAskForSpace(); err == nil {
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alloc.debugln("Decided to ask peer", donor, "for space")
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alloc.sendRequest(donor, msgSpaceRequest)
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}
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return false
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}
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func (g *allocate) Cancel() {
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g.resultChan <- allocateResult{0, fmt.Errorf("Request Cancelled")}
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}
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func (g *allocate) String() string {
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return fmt.Sprintf("Allocate for %s", g.ident)
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}
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func (g *allocate) ForContainer(ident string) bool {
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return g.ident == ident
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}
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