micro/util/register/util.go

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package register // import "go.unistack.org/micro/v3/util/register"
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import (
"context"
"time"
"go.unistack.org/micro/v3/register"
jitter "go.unistack.org/micro/v3/util/jitter"
)
func addNodes(old, neu []*register.Node) []*register.Node {
nodes := make([]*register.Node, 0, len(neu))
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// add all new nodes
for _, n := range neu {
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node := *n
nodes = append(nodes, &node)
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}
// 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 {
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exists = true
break
}
}
// keep old node
if !exists {
node := *o
nodes = append(nodes, &node)
}
}
return nodes
}
func delNodes(old, del []*register.Node) []*register.Node {
var nodes []*register.Node
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for _, o := range old {
var rem bool
for _, n := range del {
if o.ID == n.ID {
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rem = true
break
}
}
if !rem {
nodes = append(nodes, o)
}
}
return nodes
}
// CopyService make a copy of service
func CopyService(service *register.Service) *register.Service {
// copy service
s := &register.Service{}
*s = *service
// copy nodes
nodes := make([]*register.Node, len(service.Nodes))
for j, node := range service.Nodes {
n := &register.Node{}
*n = *node
nodes[j] = n
}
s.Nodes = nodes
// copy endpoints
eps := make([]*register.Endpoint, len(service.Endpoints))
for j, ep := range service.Endpoints {
e := &register.Endpoint{}
*e = *ep
eps[j] = e
}
s.Endpoints = eps
return s
}
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// Copy makes a copy of services
func Copy(current []*register.Service) []*register.Service {
services := make([]*register.Service, len(current))
for i, service := range current {
services[i] = CopyService(service)
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}
return services
}
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// Merge merges two lists of services and returns a new copy
func Merge(olist []*register.Service, nlist []*register.Service) []*register.Service {
var srv []*register.Service
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for _, n := range nlist {
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var seen bool
for _, o := range olist {
if o.Version == n.Version {
sp := &register.Service{}
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// make copy
*sp = *o
// set nodes
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sp.Nodes = addNodes(o.Nodes, n.Nodes)
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// mark as seen
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seen = true
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srv = append(srv, sp)
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break
} else {
sp := &register.Service{}
// make copy
*sp = *o
srv = append(srv, sp)
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}
}
if !seen {
srv = append(srv, Copy([]*register.Service{n})...)
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}
}
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return srv
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}
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// Remove removes services and returns a new copy
func Remove(old, del []*register.Service) []*register.Service {
var services []*register.Service
for _, o := range old {
srv := &register.Service{}
*srv = *o
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var rem bool
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for _, s := range del {
if srv.Version == s.Version {
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srv.Nodes = delNodes(srv.Nodes, s.Nodes)
if len(srv.Nodes) == 0 {
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rem = true
}
}
}
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if !rem {
services = append(services, srv)
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}
}
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return services
}
// WaitService using register wait for service to appear with min/max interval for check and optional timeout.
// Timeout can be 0 to wait infinitive.
func WaitService(ctx context.Context, reg register.Register, name string, min time.Duration, max time.Duration, timeout time.Duration, opts ...register.LookupOption) error {
if timeout > 0 {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, timeout)
defer cancel()
}
ticker := jitter.NewTickerContext(ctx, min, max)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return ctx.Err()
case _, ok := <-ticker.C:
if _, err := reg.LookupService(ctx, name, opts...); err == nil {
return nil
}
if ok {
return register.ErrNotFound
}
}
}
}