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grpc_group.go
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grpc_group.go
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package grpc
import (
"context"
"math"
"github.com/go-graphite/carbonzipper/limiter"
"github.com/go-graphite/carbonzipper/zipper/errors"
"github.com/go-graphite/carbonzipper/zipper/metadata"
"github.com/go-graphite/carbonzipper/zipper/types"
protov3grpc "github.com/go-graphite/protocol/carbonapi_v3_grpc"
protov3 "github.com/go-graphite/protocol/carbonapi_v3_pb"
"google.golang.org/grpc"
_ "google.golang.org/grpc/balancer/roundrobin"
"google.golang.org/grpc/resolver"
"google.golang.org/grpc/resolver/manual"
"go.uber.org/zap"
)
func init() {
aliases := []string{"carbonapi_v3_grpc", "proto_v3_grpc", "v3_grpc"}
metadata.Metadata.Lock()
for _, name := range aliases {
metadata.Metadata.SupportedProtocols[name] = struct{}{}
metadata.Metadata.ProtocolInits[name] = NewClientGRPCGroup
metadata.Metadata.ProtocolInitsWithLimiter[name] = NewClientGRPCGroupWithLimiter
}
defer metadata.Metadata.Unlock()
}
// RoundRobin is used to connect to backends inside clientGRPCGroups, implements ServerClient interface
type ClientGRPCGroup struct {
groupName string
servers []string
r *manual.Resolver
conn *grpc.ClientConn
dialerrc chan error
cleanup func()
timeout types.Timeouts
maxMetricsPerRequest int
client protov3grpc.CarbonV1Client
logger *zap.Logger
}
func NewClientGRPCGroupWithLimiter(logger *zap.Logger, config types.BackendV2, limiter *limiter.ServerLimiter) (types.ServerClient, *errors.Errors) {
return NewClientGRPCGroup(logger, config)
}
func NewClientGRPCGroup(logger *zap.Logger, config types.BackendV2) (types.ServerClient, *errors.Errors) {
logger = logger.With(zap.String("type", "grpcGroup"), zap.String("name", config.GroupName))
// TODO: Implement normal resolver
if len(config.Servers) == 0 {
return nil, errors.Fatal("no servers specified")
}
r, cleanup := manual.GenerateAndRegisterManualResolver()
var resolvedAddrs []resolver.Address
for _, addr := range config.Servers {
resolvedAddrs = append(resolvedAddrs, resolver.Address{Addr: addr})
}
r.NewAddress(resolvedAddrs)
opts := []grpc.DialOption{
grpc.WithUserAgent("carbonzipper"),
grpc.WithCompressor(grpc.NewGZIPCompressor()),
grpc.WithDecompressor(grpc.NewGZIPDecompressor()),
grpc.WithBalancerName("round_robin"), // TODO: Make that configurable
grpc.WithMaxMsgSize(math.MaxUint32), // TODO: make that configurable
grpc.WithInsecure(), // TODO: Make configurable
}
conn, err := grpc.Dial(r.Scheme()+":///server", opts...)
if err != nil {
cleanup()
return nil, errors.FromErr(err)
}
client := &ClientGRPCGroup{
groupName: config.GroupName,
servers: config.Servers,
maxMetricsPerRequest: config.MaxGlobs,
r: r,
cleanup: cleanup,
conn: conn,
client: protov3grpc.NewCarbonV1Client(conn),
timeout: *config.Timeouts,
logger: logger,
}
return client, nil
}
func (c ClientGRPCGroup) MaxMetricsPerRequest() int {
return c.maxMetricsPerRequest
}
func (c ClientGRPCGroup) Name() string {
return c.groupName
}
func (c ClientGRPCGroup) Backends() []string {
return c.servers
}
func (c *ClientGRPCGroup) Fetch(ctx context.Context, request *protov3.MultiFetchRequest) (*protov3.MultiFetchResponse, *types.Stats, *errors.Errors) {
stats := &types.Stats{
Servers: []string{c.Name()},
}
ctx, cancel := context.WithTimeout(ctx, c.timeout.Render)
defer cancel()
res, err := c.client.FetchMetrics(ctx, request)
if err != nil {
stats.RenderErrors++
stats.FailedServers = stats.Servers
stats.Servers = []string{}
}
stats.MemoryUsage = int64(res.Size())
return res, stats, errors.FromErrNonFatal(err)
}
func (c *ClientGRPCGroup) Find(ctx context.Context, request *protov3.MultiGlobRequest) (*protov3.MultiGlobResponse, *types.Stats, *errors.Errors) {
stats := &types.Stats{
Servers: []string{c.Name()},
}
ctx, cancel := context.WithTimeout(ctx, c.timeout.Find)
defer cancel()
res, err := c.client.FindMetrics(ctx, request)
if err != nil {
stats.RenderErrors++
stats.FailedServers = stats.Servers
stats.Servers = []string{}
}
stats.MemoryUsage = int64(res.Size())
return res, stats, errors.FromErrNonFatal(err)
}
func (c *ClientGRPCGroup) Info(ctx context.Context, request *protov3.MultiMetricsInfoRequest) (*protov3.ZipperInfoResponse, *types.Stats, *errors.Errors) {
stats := &types.Stats{
Servers: []string{c.Name()},
}
ctx, cancel := context.WithTimeout(ctx, c.timeout.Render)
defer cancel()
res, err := c.client.MetricsInfo(ctx, request)
if err != nil {
stats.RenderErrors++
stats.FailedServers = stats.Servers
stats.Servers = []string{}
}
stats.MemoryUsage = int64(res.Size())
r := &protov3.ZipperInfoResponse{
Info: map[string]protov3.MultiMetricsInfoResponse{
c.Name(): *res,
},
}
return r, stats, errors.FromErrNonFatal(err)
}
func (c *ClientGRPCGroup) List(ctx context.Context) (*protov3.ListMetricsResponse, *types.Stats, *errors.Errors) {
stats := &types.Stats{
Servers: []string{c.Name()},
}
ctx, cancel := context.WithTimeout(ctx, c.timeout.Render)
defer cancel()
res, err := c.client.ListMetrics(ctx, types.EmptyMsg)
if err != nil {
stats.RenderErrors++
stats.FailedServers = stats.Servers
stats.Servers = []string{}
}
stats.MemoryUsage = int64(res.Size())
return res, stats, errors.FromErrNonFatal(err)
}
func (c *ClientGRPCGroup) Stats(ctx context.Context) (*protov3.MetricDetailsResponse, *types.Stats, *errors.Errors) {
stats := &types.Stats{
Servers: []string{c.Name()},
}
ctx, cancel := context.WithTimeout(ctx, c.timeout.Render)
defer cancel()
res, err := c.client.Stats(ctx, types.EmptyMsg)
if err != nil {
stats.RenderErrors++
stats.FailedServers = stats.Servers
stats.Servers = []string{}
}
stats.MemoryUsage = int64(res.Size())
return res, stats, errors.FromErrNonFatal(err)
}
func (c *ClientGRPCGroup) ProbeTLDs(ctx context.Context) ([]string, *errors.Errors) {
logger := c.logger.With(zap.String("type", "probe"))
ctx, cancel := context.WithTimeout(ctx, c.timeout.Find)
defer cancel()
req := &protov3.MultiGlobRequest{
Metrics: []string{"*"},
}
logger.Debug("doing request",
zap.Any("request", req),
)
res, _, err := c.Find(ctx, req)
if err != nil {
return nil, err
}
var tlds []string
for _, m := range res.Metrics {
for _, v := range m.Matches {
tlds = append(tlds, v.Path)
}
}
return tlds, nil
}