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Copy pathlocation_endpoint.go
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Copy pathlocation_endpoint.go
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139 lines (114 loc) · 3.37 KB
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/*
Copyright 2026 Google LLC
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package spanner
import (
"context"
"sync"
"google.golang.org/grpc"
)
// channelEndpoint represents a routable server endpoint.
type channelEndpoint interface {
Address() string
IsHealthy() bool
IsTransientFailure() bool
GetConn() *grpc.ClientConn
IncrementActiveRequests()
DecrementActiveRequests()
ActiveRequestCount() int
}
// channelEndpointCache caches endpoints by server address.
type channelEndpointCache interface {
Get(ctx context.Context, address string) channelEndpoint
GetIfPresent(address string) channelEndpoint
Evict(address string)
DefaultChannel() channelEndpoint
ClientFor(ep channelEndpoint) spannerClient
Close() error
}
type passthroughChannelEndpoint struct {
address string
}
var (
_ channelEndpoint = (*passthroughChannelEndpoint)(nil)
_ channelEndpointCache = (*passthroughChannelEndpointCache)(nil)
)
func (e *passthroughChannelEndpoint) Address() string {
return e.address
}
func (*passthroughChannelEndpoint) IsHealthy() bool {
return true
}
func (*passthroughChannelEndpoint) IsTransientFailure() bool {
return false
}
func (*passthroughChannelEndpoint) GetConn() *grpc.ClientConn {
return nil
}
func (*passthroughChannelEndpoint) IncrementActiveRequests() {}
func (*passthroughChannelEndpoint) DecrementActiveRequests() {}
func (*passthroughChannelEndpoint) ActiveRequestCount() int {
return 0
}
type passthroughChannelEndpointCache struct {
mu sync.Mutex
endpoints map[string]*passthroughChannelEndpoint
defaultEndpoint *passthroughChannelEndpoint
}
func newPassthroughChannelEndpointCache() *passthroughChannelEndpointCache {
return &passthroughChannelEndpointCache{
endpoints: make(map[string]*passthroughChannelEndpoint),
defaultEndpoint: &passthroughChannelEndpoint{address: ""},
}
}
func (c *passthroughChannelEndpointCache) Get(_ context.Context, address string) channelEndpoint {
if address == "" {
return c.defaultEndpoint
}
c.mu.Lock()
defer c.mu.Unlock()
if endpoint, ok := c.endpoints[address]; ok {
return endpoint
}
endpoint := &passthroughChannelEndpoint{address: address}
c.endpoints[address] = endpoint
return endpoint
}
func (c *passthroughChannelEndpointCache) GetIfPresent(address string) channelEndpoint {
if address == "" {
return c.defaultEndpoint
}
c.mu.Lock()
defer c.mu.Unlock()
endpoint, ok := c.endpoints[address]
if !ok {
return nil
}
return endpoint
}
func (c *passthroughChannelEndpointCache) Evict(address string) {
if address == c.defaultEndpoint.Address() {
return
}
c.mu.Lock()
defer c.mu.Unlock()
delete(c.endpoints, address)
}
func (c *passthroughChannelEndpointCache) DefaultChannel() channelEndpoint {
return c.defaultEndpoint
}
func (c *passthroughChannelEndpointCache) ClientFor(_ channelEndpoint) spannerClient {
return nil
}
func (c *passthroughChannelEndpointCache) Close() error {
return nil
}