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fix: use grpc load-balancing when connecting to trustd
Instead of doing our homegrown "try all the endpoints" method, use gRPC load-balancing across configured endpoints. Generalize load-balancer via gRPC resolver we had in Talos API client, use it in remote certificate generator code. Generalized resolver is still under `machinery/`, as `pkg/grpc` is not in `machinery/`, and we can't depend on Talos code from `machinery/`. Related to: #3068 Full fix for #3068 requires dynamic updates to control plane endpoints while apid is running, this is coming in the next PR. Signed-off-by: Andrey Smirnov <smirnov.andrey@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,6 @@ | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
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| // Package resolver implements gRPC resolvers. | ||
| package resolver |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
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| package resolver | ||
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| import ( | ||
| "fmt" | ||
| "math/rand" | ||
| "strings" | ||
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| "github.com/talos-systems/net" | ||
| "google.golang.org/grpc/resolver" | ||
| ) | ||
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| // RegisterRoundRobinResolver registers round-robin gRPC resolver for specified port and returns scheme to use in grpc.Dial. | ||
| func RegisterRoundRobinResolver(port int) (scheme string) { | ||
| scheme = fmt.Sprintf(roundRobinResolverScheme, port) | ||
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| resolver.Register(&roundRobinResolverBuilder{ | ||
| port: port, | ||
| scheme: scheme, | ||
| }) | ||
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| return | ||
| } | ||
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| const roundRobinResolverScheme = "taloslist-%d" | ||
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| type roundRobinResolverBuilder struct { | ||
| port int | ||
| scheme string | ||
| } | ||
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| // Build implements resolver.Builder. | ||
| func (b *roundRobinResolverBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) { | ||
| r := &roundRobinResolver{ | ||
| target: target, | ||
| cc: cc, | ||
| port: b.port, | ||
| } | ||
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| if err := r.start(); err != nil { | ||
| return nil, err | ||
| } | ||
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| return r, nil | ||
| } | ||
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| // Build implements resolver.Builder. | ||
| func (b *roundRobinResolverBuilder) Scheme() string { | ||
| return b.scheme | ||
| } | ||
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| type roundRobinResolver struct { | ||
| target resolver.Target | ||
| cc resolver.ClientConn | ||
| port int | ||
| } | ||
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| func (r *roundRobinResolver) start() error { | ||
| var addrs []resolver.Address // nolint: prealloc | ||
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| for _, a := range strings.Split(r.target.Endpoint, ",") { | ||
| addrs = append(addrs, resolver.Address{ | ||
| ServerName: a, | ||
| Addr: fmt.Sprintf("%s:%d", net.FormatAddress(a), r.port), | ||
| }) | ||
| } | ||
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| // shuffle the list in case client does just one request | ||
| rand.Shuffle(len(addrs), func(i, j int) { | ||
| addrs[i], addrs[j] = addrs[j], addrs[i] | ||
| }) | ||
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| serviceConfigJSON := `{ | ||
| "loadBalancingConfig": [{ | ||
| "round_robin": {} | ||
| }] | ||
| }` | ||
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| parsedServiceConfig := r.cc.ParseServiceConfig(serviceConfigJSON) | ||
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| if parsedServiceConfig.Err != nil { | ||
| return parsedServiceConfig.Err | ||
| } | ||
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| r.cc.UpdateState(resolver.State{ | ||
| Addresses: addrs, | ||
| ServiceConfig: parsedServiceConfig, | ||
| }) | ||
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| return nil | ||
| } | ||
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| // ResolveNow implements resolver.Resolver. | ||
| func (r *roundRobinResolver) ResolveNow(o resolver.ResolveNowOptions) {} | ||
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| // ResolveNow implements resolver.Resolver. | ||
| func (r *roundRobinResolver) Close() {} |