-
Notifications
You must be signed in to change notification settings - Fork 2.1k
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Signed-off-by: Roy Chiang <[email protected]>
- Loading branch information
1 parent
986c3cc
commit 3644367
Showing
6 changed files
with
415 additions
and
16 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| package memcache | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/go-kit/kit/log" | ||
| "github.com/go-kit/kit/log/level" | ||
| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/client_golang/prometheus/promauto" | ||
| "github.com/thanos-io/thanos/pkg/errutil" | ||
| "github.com/thanos-io/thanos/pkg/extprom" | ||
| ) | ||
|
|
||
| type Provider struct { | ||
| sync.RWMutex | ||
| resolver Resolver | ||
| clusterConfigs map[string]*ClusterConfig | ||
| logger log.Logger | ||
|
|
||
| configVersion *extprom.TxGaugeVec | ||
| resolvedAddresses *extprom.TxGaugeVec | ||
| resolverFailuresCount prometheus.Counter | ||
| resolverLookupsCount prometheus.Counter | ||
| } | ||
|
|
||
| func NewProvider(logger log.Logger, reg prometheus.Registerer, dialTimeout time.Duration) *Provider { | ||
| p := &Provider{ | ||
| resolver: &memcachedAutoDiscovery{dialTimeout: dialTimeout}, | ||
| clusterConfigs: map[string]*ClusterConfig{}, | ||
| configVersion: extprom.NewTxGaugeVec(reg, prometheus.GaugeOpts{ | ||
| Name: "auto_discovery_config_version", | ||
| Help: "The current auto discovery config version", | ||
| }, []string{"addr"}), | ||
| resolvedAddresses: extprom.NewTxGaugeVec(reg, prometheus.GaugeOpts{ | ||
| Name: "auto_discovery_resolved_addresses", | ||
| Help: "The number of memcached nodes found via auto discovery", | ||
| }, []string{"addr"}), | ||
| resolverLookupsCount: promauto.With(reg).NewCounter(prometheus.CounterOpts{ | ||
| Name: "auto_discovery_total", | ||
| Help: "The number of memcache auto discovery attempts", | ||
| }), | ||
| resolverFailuresCount: promauto.With(reg).NewCounter(prometheus.CounterOpts{ | ||
| Name: "auto_discovery_failures_total", | ||
| Help: "The number of memcache auto discovery failures", | ||
| }), | ||
| } | ||
| return p | ||
| } | ||
|
|
||
| func (p *Provider) Resolve(ctx context.Context, addresses []string) error { | ||
| clusterConfigs := map[string]*ClusterConfig{} | ||
| errs := errutil.MultiError{} | ||
|
|
||
| for _, address := range addresses { | ||
| clusterConfig, err := p.resolver.Resolve(ctx, address) | ||
| p.resolverLookupsCount.Inc() | ||
|
|
||
| if err != nil { | ||
| level.Warn(p.logger).Log( | ||
| "msg", "failed to perform auto-discovery for memcached", | ||
| "address", address, | ||
| ) | ||
| errs.Add(err) | ||
| p.resolverFailuresCount.Inc() | ||
|
|
||
| // Use cached values. | ||
| p.RLock() | ||
| clusterConfigs[address] = p.clusterConfigs[address] | ||
| p.RUnlock() | ||
| } else { | ||
| clusterConfigs[address] = clusterConfig | ||
| } | ||
| } | ||
|
|
||
| p.Lock() | ||
| defer p.Unlock() | ||
|
|
||
| p.resolvedAddresses.ResetTx() | ||
| p.configVersion.ResetTx() | ||
| for address, config := range clusterConfigs { | ||
| p.resolvedAddresses.WithLabelValues(address).Set(float64(len(config.nodes))) | ||
| p.configVersion.WithLabelValues(address).Set(float64(config.version)) | ||
| } | ||
| p.resolvedAddresses.Submit() | ||
| p.configVersion.Submit() | ||
|
|
||
| p.clusterConfigs = clusterConfigs | ||
|
|
||
| return errs.Err() | ||
| } | ||
|
|
||
| func (p *Provider) Addresses() []string { | ||
| var result []string | ||
| for _, config := range p.clusterConfigs { | ||
| for _, node := range config.nodes { | ||
| result = append(result, fmt.Sprintf("%s:%d", node.dns, node.port)) | ||
| } | ||
| } | ||
| return result | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| package memcache | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "sort" | ||
| "testing" | ||
| "time" | ||
|
|
||
| "github.com/go-kit/kit/log" | ||
| "github.com/thanos-io/thanos/pkg/testutil" | ||
| ) | ||
|
|
||
| func TestProviderUpdatesAddresses(t *testing.T) { | ||
| ctx := context.TODO() | ||
| clusters := []string{"memcached-cluster-1", "memcached-cluster-2"} | ||
| provider := NewProvider(log.NewNopLogger(), nil, 5*time.Second) | ||
| resolver := mockResolver{ | ||
| configs: map[string]*ClusterConfig{ | ||
| "memcached-cluster-1": {nodes: []Node{{dns: "dns-1", ip: "ip-1", port: 11211}}}, | ||
| "memcached-cluster-2": {nodes: []Node{{dns: "dns-2", ip: "ip-2", port: 8080}}}, | ||
| }, | ||
| } | ||
| provider.resolver = &resolver | ||
|
|
||
| err := provider.Resolve(ctx, clusters) | ||
| addresses := provider.Addresses() | ||
| sort.Strings(addresses) | ||
|
|
||
| testutil.Ok(t, err) | ||
| testutil.Equals(t, []string{"dns-1:11211", "dns-2:8080"}, addresses) | ||
|
|
||
| resolver.configs = map[string]*ClusterConfig{ | ||
| "memcached-cluster-1": {nodes: []Node{{dns: "dns-1", ip: "ip-1", port: 11211}, {dns: "dns-3", ip: "ip-3", port: 11211}}}, | ||
| "memcached-cluster-2": {nodes: []Node{{dns: "dns-2", ip: "ip-2", port: 8080}}}, | ||
| } | ||
| err = provider.Resolve(ctx, clusters) | ||
| addresses = provider.Addresses() | ||
| sort.Strings(addresses) | ||
|
|
||
| testutil.Ok(t, err) | ||
| testutil.Equals(t, []string{"dns-1:11211", "dns-2:8080", "dns-3:11211"}, addresses) | ||
| } | ||
|
|
||
| func TestProviderDoesNotUpdateAddressIfFailed(t *testing.T) { | ||
| ctx := context.TODO() | ||
| clusters := []string{"memcached-cluster-1", "memcached-cluster-2"} | ||
| provider := NewProvider(log.NewNopLogger(), nil, 5*time.Second) | ||
| resolver := mockResolver{ | ||
| configs: map[string]*ClusterConfig{ | ||
| "memcached-cluster-1": {nodes: []Node{{dns: "dns-1", ip: "ip-1", port: 11211}}}, | ||
| "memcached-cluster-2": {nodes: []Node{{dns: "dns-2", ip: "ip-2", port: 8080}}}, | ||
| }, | ||
| } | ||
| provider.resolver = &resolver | ||
|
|
||
| err := provider.Resolve(ctx, clusters) | ||
| addresses := provider.Addresses() | ||
| sort.Strings(addresses) | ||
|
|
||
| testutil.Ok(t, err) | ||
| testutil.Equals(t, []string{"dns-1:11211", "dns-2:8080"}, addresses) | ||
|
|
||
| resolver.configs = nil | ||
| resolver.err = errors.New("oops") | ||
| err = provider.Resolve(ctx, clusters) | ||
| addresses = provider.Addresses() | ||
| sort.Strings(addresses) | ||
|
|
||
| testutil.NotOk(t, err) | ||
| testutil.Equals(t, []string{"dns-1:11211", "dns-2:8080"}, addresses) | ||
| } | ||
|
|
||
| type mockResolver struct { | ||
| configs map[string]*ClusterConfig | ||
| err error | ||
| } | ||
|
|
||
| func (r *mockResolver) Resolve(_ context.Context, address string) (*ClusterConfig, error) { | ||
| if r.err != nil { | ||
| return nil, r.err | ||
| } | ||
| return r.configs[address], nil | ||
| } |
Oops, something went wrong.