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cmd/cloner,*: optimize nillable slice cloner

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A wild @josharian appears with a good suggestion for a refactor, thanks
Josh!

Updates #9410
Signed-off-by: James Tucker <james@tailscale.com>
This commit is contained in:
James Tucker
2023-09-29 17:29:17 -07:00
committed by James Tucker
parent e91e96dfa5
commit ee90cd02fd
5 changed files with 34 additions and 58 deletions
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40
tailcfg/tailcfg_clone.go
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@@ -74,11 +74,9 @@ func (src *Node) Clone() *Node {
if dst.SelfNodeV6MasqAddrForThisPeer != nil {
dst.SelfNodeV6MasqAddrForThisPeer = ptr.To(*src.SelfNodeV6MasqAddrForThisPeer)
}
if src.ExitNodeDNSResolvers != nil {
dst.ExitNodeDNSResolvers = make([]*dnstype.Resolver, len(src.ExitNodeDNSResolvers))
for i := range dst.ExitNodeDNSResolvers {
dst.ExitNodeDNSResolvers[i] = src.ExitNodeDNSResolvers[i].Clone()
}
dst.ExitNodeDNSResolvers = append([]*dnstype.Resolver(nil), make([]*dnstype.Resolver, len(src.ExitNodeDNSResolvers))...)
for i := range dst.ExitNodeDNSResolvers {
dst.ExitNodeDNSResolvers[i] = src.ExitNodeDNSResolvers[i].Clone()
}
return dst
}
@@ -237,11 +235,9 @@ func (src *DNSConfig) Clone() *DNSConfig {
}
dst := new(DNSConfig)
*dst = *src
if src.Resolvers != nil {
dst.Resolvers = make([]*dnstype.Resolver, len(src.Resolvers))
for i := range dst.Resolvers {
dst.Resolvers[i] = src.Resolvers[i].Clone()
}
dst.Resolvers = append([]*dnstype.Resolver(nil), make([]*dnstype.Resolver, len(src.Resolvers))...)
for i := range dst.Resolvers {
dst.Resolvers[i] = src.Resolvers[i].Clone()
}
if dst.Routes != nil {
dst.Routes = map[string][]*dnstype.Resolver{}
@@ -249,11 +245,9 @@ func (src *DNSConfig) Clone() *DNSConfig {
dst.Routes[k] = append([]*dnstype.Resolver{}, src.Routes[k]...)
}
}
if src.FallbackResolvers != nil {
dst.FallbackResolvers = make([]*dnstype.Resolver, len(src.FallbackResolvers))
for i := range dst.FallbackResolvers {
dst.FallbackResolvers[i] = src.FallbackResolvers[i].Clone()
}
dst.FallbackResolvers = append([]*dnstype.Resolver(nil), make([]*dnstype.Resolver, len(src.FallbackResolvers))...)
for i := range dst.FallbackResolvers {
dst.FallbackResolvers[i] = src.FallbackResolvers[i].Clone()
}
dst.Domains = append(src.Domains[:0:0], src.Domains...)
dst.Nameservers = append(src.Nameservers[:0:0], src.Nameservers...)
@@ -387,11 +381,9 @@ func (src *DERPRegion) Clone() *DERPRegion {
}
dst := new(DERPRegion)
*dst = *src
if src.Nodes != nil {
dst.Nodes = make([]*DERPNode, len(src.Nodes))
for i := range dst.Nodes {
dst.Nodes[i] = src.Nodes[i].Clone()
}
dst.Nodes = append([]*DERPNode(nil), make([]*DERPNode, len(src.Nodes))...)
for i := range dst.Nodes {
dst.Nodes[i] = src.Nodes[i].Clone()
}
return dst
}
@@ -468,11 +460,9 @@ func (src *SSHRule) Clone() *SSHRule {
if dst.RuleExpires != nil {
dst.RuleExpires = ptr.To(*src.RuleExpires)
}
if src.Principals != nil {
dst.Principals = make([]*SSHPrincipal, len(src.Principals))
for i := range dst.Principals {
dst.Principals[i] = src.Principals[i].Clone()
}
dst.Principals = append([]*SSHPrincipal(nil), make([]*SSHPrincipal, len(src.Principals))...)
for i := range dst.Principals {
dst.Principals[i] = src.Principals[i].Clone()
}
dst.SSHUsers = maps.Clone(src.SSHUsers)
dst.Action = src.Action.Clone()