77 lines
1.9 KiB
Go
77 lines
1.9 KiB
Go
package health
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import (
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"context"
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"github.com/hashicorp/consul/agent/cache"
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"github.com/hashicorp/consul/agent/structs"
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)
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type Client struct {
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NetRPC NetRPC
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Cache CacheGetter
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// CacheName to use for service health.
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CacheName string
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}
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type NetRPC interface {
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RPC(method string, args interface{}, reply interface{}) error
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}
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type CacheGetter interface {
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Get(ctx context.Context, t string, r cache.Request) (interface{}, cache.ResultMeta, error)
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Notify(ctx context.Context, t string, r cache.Request, cID string, ch chan<- cache.UpdateEvent) error
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}
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func (c *Client) ServiceNodes(
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ctx context.Context,
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req structs.ServiceSpecificRequest,
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) (structs.IndexedCheckServiceNodes, cache.ResultMeta, error) {
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out, md, err := c.getServiceNodes(ctx, req)
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if err != nil {
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return out, md, err
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}
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// TODO: DNSServer emitted a metric here, do we still need it?
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if req.QueryOptions.AllowStale && req.QueryOptions.MaxStaleDuration > 0 && out.QueryMeta.LastContact > req.MaxStaleDuration {
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req.AllowStale = false
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err := c.NetRPC.RPC("Health.ServiceNodes", &req, &out)
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return out, cache.ResultMeta{}, err
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}
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return out, md, err
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}
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func (c *Client) getServiceNodes(
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ctx context.Context,
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req structs.ServiceSpecificRequest,
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) (structs.IndexedCheckServiceNodes, cache.ResultMeta, error) {
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var out structs.IndexedCheckServiceNodes
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if !req.QueryOptions.UseCache {
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err := c.NetRPC.RPC("Health.ServiceNodes", &req, &out)
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return out, cache.ResultMeta{}, err
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}
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raw, md, err := c.Cache.Get(ctx, c.CacheName, &req)
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if err != nil {
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return out, md, err
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}
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value, ok := raw.(*structs.IndexedCheckServiceNodes)
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if !ok {
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panic("wrong response type for cachetype.HealthServicesName")
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}
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return *value, md, nil
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}
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func (c *Client) Notify(
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ctx context.Context,
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req structs.ServiceSpecificRequest,
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correlationID string,
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ch chan<- cache.UpdateEvent,
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) error {
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return c.Cache.Notify(ctx, c.CacheName, &req, correlationID, ch)
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}
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