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util.go
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util.go
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package registry
func addNodes(old, neu []*Node) []*Node {
nodes := make([]*Node, len(neu))
// add all new nodes
for i, n := range neu {
node := *n
nodes[i] = &node
}
// look at old nodes
for _, o := range old {
var exists bool
// check against new nodes
for _, n := range nodes {
// ids match then skip
if o.Id == n.Id {
exists = true
break
}
}
// keep old node
if !exists {
node := *o
nodes = append(nodes, &node)
}
}
return nodes
}
func delNodes(old, del []*Node) []*Node {
var nodes []*Node
for _, o := range old {
var rem bool
for _, n := range del {
if o.Id == n.Id {
rem = true
break
}
}
if !rem {
nodes = append(nodes, o)
}
}
return nodes
}
// Copy makes a copy of services
func Copy(current []*Service) []*Service {
services := make([]*Service, len(current))
for i, service := range current {
// copy service
s := new(Service)
*s = *service
// copy nodes
nodes := make([]*Node, len(service.Nodes))
for j, node := range service.Nodes {
n := new(Node)
*n = *node
nodes[j] = n
}
s.Nodes = nodes
// copy endpoints
eps := make([]*Endpoint, len(service.Endpoints))
for j, ep := range service.Endpoints {
e := new(Endpoint)
*e = *ep
eps[j] = e
}
s.Endpoints = eps
// append service
services[i] = s
}
return services
}
// Merge merges two lists of services and returns a new copy
func Merge(olist []*Service, nlist []*Service) []*Service {
var srv []*Service
for _, n := range nlist {
var seen bool
for _, o := range olist {
if o.Version == n.Version {
sp := new(Service)
// make copy
*sp = *o
// set nodes
sp.Nodes = addNodes(o.Nodes, n.Nodes)
// mark as seen
seen = true
srv = append(srv, sp)
break
} else {
sp := new(Service)
// make copy
*sp = *o
srv = append(srv, sp)
}
}
if !seen {
srv = append(srv, Copy([]*Service{n})...)
}
}
return srv
}
// Remove removes services and returns a new copy
func Remove(old, del []*Service) []*Service {
var services []*Service
for _, o := range old {
srv := new(Service)
*srv = *o
var rem bool
for _, s := range del {
if srv.Version == s.Version {
srv.Nodes = delNodes(srv.Nodes, s.Nodes)
if len(srv.Nodes) == 0 {
rem = true
}
}
}
if !rem {
services = append(services, srv)
}
}
return services
}