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broadcast_group.go
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broadcast_group.go
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package broadcast
import (
"context"
"fmt"
"net"
"sort"
"strings"
"github.com/ansel1/merry"
protov3 "github.com/go-graphite/protocol/carbonapi_v3_pb"
"github.com/lomik/zapwriter"
"github.com/go-graphite/carbonapi/limiter"
"github.com/go-graphite/carbonapi/pathcache"
utilctx "github.com/go-graphite/carbonapi/util/ctx"
"github.com/go-graphite/carbonapi/zipper/helper"
"github.com/go-graphite/carbonapi/zipper/types"
"go.uber.org/zap"
)
type BroadcastGroup struct {
limiter limiter.ServerLimiter
groupName string
timeout types.Timeouts
backends []types.BackendServer
servers []string
maxMetricsPerRequest int
doMultipleRequestsIfSplit bool
tldCacheDisabled bool
concurrencyLimit int
fetcher types.Fetcher
pathCache pathcache.PathCache
logger *zap.Logger
dialer *net.Dialer
}
type Option func(group *BroadcastGroup)
func WithLogger(logger *zap.Logger) Option {
return func(bg *BroadcastGroup) {
bg.logger = logger
}
}
func WithGroupName(name string) Option {
return func(bg *BroadcastGroup) {
bg.groupName = name
}
}
func WithSplitMultipleRequests(multiRequests bool) Option {
if multiRequests {
return func(bg *BroadcastGroup) {
bg.doMultipleRequestsIfSplit = true
bg.fetcher = bg.doMultiFetch
}
}
return func(bg *BroadcastGroup) {
bg.doMultipleRequestsIfSplit = false
bg.fetcher = bg.doSingleFetch
}
}
func WithBackends(backends []types.BackendServer) Option {
return func(bg *BroadcastGroup) {
serverNames := make([]string, 0, len(backends))
for _, b := range backends {
serverNames = append(serverNames, b.Name())
}
bg.backends = backends
bg.servers = serverNames
}
}
func WithPathCache(expireDelaySec int32) Option {
return func(bg *BroadcastGroup) {
bg.pathCache = pathcache.NewPathCache(expireDelaySec)
}
}
func WithLimiter(concurrencyLimit int) Option {
return func(bg *BroadcastGroup) {
bg.concurrencyLimit = concurrencyLimit
}
}
func WithMaxMetricsPerRequest(maxMetricsPerRequest int) Option {
return func(bg *BroadcastGroup) {
bg.maxMetricsPerRequest = maxMetricsPerRequest
}
}
func WithTLDCache(enableTLDCache bool) Option {
return func(bg *BroadcastGroup) {
bg.tldCacheDisabled = !enableTLDCache
}
}
func WithTimeouts(timeouts types.Timeouts) Option {
return func(bg *BroadcastGroup) {
bg.timeout = timeouts
}
}
func WithDialer(dialer *net.Dialer) Option {
return func(bg *BroadcastGroup) {
bg.dialer = dialer
}
}
func New(opts ...Option) (*BroadcastGroup, merry.Error) {
bg := &BroadcastGroup{
limiter: limiter.NoopLimiter{},
}
for _, opt := range opts {
opt(bg)
}
if bg.logger == nil {
logger := zapwriter.Logger("init")
logger.Fatal("failed to initialize backend")
}
bg.logger = bg.logger.With(zap.String("type", "broadcastGroup"), zap.String("groupName", bg.groupName))
if len(bg.backends) == 0 {
return nil, types.ErrNoServersSpecified
}
if bg.concurrencyLimit != 0 {
bg.limiter = limiter.NewServerLimiter(bg.servers, bg.concurrencyLimit)
}
return bg, nil
}
func (bg *BroadcastGroup) Children() []types.BackendServer {
return bg.backends
}
func (bg *BroadcastGroup) SetDoMultipleRequestIfSplit(v bool) {
bg.doMultipleRequestsIfSplit = v
if v {
bg.fetcher = bg.doMultiFetch
} else {
bg.fetcher = bg.doSingleFetch
}
}
func NewBroadcastGroup(logger *zap.Logger, groupName string, doMultipleRequestsIfSplit bool, servers []types.BackendServer, expireDelaySec int32, concurrencyLimit, maxBatchSize int, timeouts types.Timeouts, tldCacheDisabled bool) (*BroadcastGroup, merry.Error) {
return New(
WithLogger(logger),
WithGroupName(groupName),
WithSplitMultipleRequests(doMultipleRequestsIfSplit),
WithBackends(servers),
WithPathCache(expireDelaySec),
WithLimiter(concurrencyLimit),
WithMaxMetricsPerRequest(maxBatchSize),
WithTimeouts(timeouts),
WithTLDCache(!tldCacheDisabled),
)
}
func (bg BroadcastGroup) Name() string {
return bg.groupName
}
func (bg BroadcastGroup) Backends() []string {
return bg.servers
}
func (bg *BroadcastGroup) filterServersByTLD(requests []string, backends []types.BackendServer) []types.BackendServer {
// do not check TLDs if internal routing cache is disabled
if bg.tldCacheDisabled {
return backends
}
tldBackends := make(map[types.BackendServer]bool)
for _, request := range requests {
// TODO(Civil): Tags: improve logic
if strings.HasPrefix(request, "seriesByTag") {
return backends
}
idx := strings.Index(request, ".")
if idx > 0 {
request = request[:idx]
}
if cachedBackends, ok := bg.pathCache.Get(request); ok && len(backends) > 0 {
for _, cachedBackend := range cachedBackends {
tldBackends[cachedBackend] = true
}
}
}
var filteredBackends []types.BackendServer
for _, k := range backends {
if tldBackends[k] {
filteredBackends = append(filteredBackends, k)
}
}
if len(filteredBackends) == 0 {
return backends
}
return filteredBackends
}
func (bg BroadcastGroup) MaxMetricsPerRequest() int {
return bg.maxMetricsPerRequest
}
func (bg *BroadcastGroup) doMultiFetch(ctx context.Context, logger *zap.Logger, backend types.BackendServer, reqs interface{}, resCh chan types.ServerFetcherResponse) {
logger = logger.With(zap.Bool("multi_fetch", true))
request, ok := reqs.(*protov3.MultiFetchRequest)
if !ok {
logger.Fatal("unhandled error in doMultiFetch",
zap.Stack("stack"),
zap.String("got_type", fmt.Sprintf("%T", reqs)),
zap.String("expected_type", fmt.Sprintf("%T", request)),
)
}
requests, err := bg.splitRequest(ctx, request, backend)
if len(requests) == 0 && err != nil {
response := types.NewServerFetchResponse()
response.Server = backend.Name()
response.AddError(err)
resCh <- response
return
}
for _, req := range requests {
go func(req *protov3.MultiFetchRequest) {
logger = logger.With(zap.String("backend_name", backend.Name()))
logger.Debug("waiting for slot",
zap.Int("max_connections", bg.limiter.Capacity()),
)
response := types.NewServerFetchResponse()
response.Server = backend.Name()
if err := bg.limiter.Enter(ctx, backend.Name()); err != nil {
logger.Debug("timeout waiting for a slot")
resCh <- response.NonFatalError(merry.Prepend(err, "timeout waiting for slot"))
return
}
logger.Debug("got slot")
defer bg.limiter.Leave(ctx, backend.Name())
// uuid := util.GetUUID(ctx)
var err merry.Error
logger.Debug("sending request")
response.Response, response.Stats, err = backend.Fetch(ctx, req)
response.AddError(err)
if response.Response != nil && response.Stats != nil {
logger.Debug("got response",
zap.Int("metrics_in_response", len(response.Response.Metrics)),
zap.Int("errors_count", len(response.Err)),
zap.Uint64("timeouts_count", response.Stats.Timeouts),
zap.Uint64("render_requests_count", response.Stats.RenderRequests),
zap.Uint64("render_errors_count", response.Stats.RenderErrors),
zap.Uint64("render_timeouts_count", response.Stats.RenderTimeouts),
zap.Uint64("zipper_requests_count", response.Stats.ZipperRequests),
zap.Uint64("total_metric_count", response.Stats.TotalMetricsCount),
zap.Int("servers_count", len(response.Stats.Servers)),
zap.Int("failed_servers_count", len(response.Stats.FailedServers)),
)
} else {
logger.Debug("got response",
zap.Bool("response_is_nil", response.Response == nil),
zap.Bool("stats_is_nil", response.Stats == nil),
zap.Any("err", err),
)
}
resCh <- response
}(req)
}
}
func (bg *BroadcastGroup) doSingleFetch(ctx context.Context, logger *zap.Logger, backend types.BackendServer, reqs interface{}, resCh chan types.ServerFetcherResponse) {
logger = logger.With(zap.Bool("multi_fetch", false))
request, ok := reqs.(*protov3.MultiFetchRequest)
if !ok {
logger.Fatal("unhandled error in doSingleFetch",
zap.Stack("stack"),
zap.String("got_type", fmt.Sprintf("%T", reqs)),
zap.String("expected_type", fmt.Sprintf("%T", request)),
)
}
// TODO(Civil): migrate limiter to merry
requests, splitErr := bg.splitRequest(ctx, request, backend)
if len(requests) == 0 && splitErr != nil {
response := types.NewServerFetchResponse()
response.Server = backend.Name()
response.AddError(splitErr)
resCh <- response
return
}
logger = logger.With(zap.String("backend_name", backend.Name()))
logger.Debug("waiting for slot",
zap.Int("max_connections", bg.limiter.Capacity()),
)
response := types.NewServerFetchResponse()
response.Server = backend.Name()
if err := bg.limiter.Enter(ctx, backend.Name()); err != nil {
logger.Debug("timeout waiting for a slot")
resCh <- response.NonFatalError(merry.Prepend(err, "timeout waiting for slot"))
return
}
logger.Debug("got slot")
defer bg.limiter.Leave(ctx, backend.Name())
// uuid := util.GetUUID(ctx)
var err merry.Error
for _, req := range requests {
logger.Debug("sending request")
r := types.NewServerFetchResponse()
r.Response, r.Stats, err = backend.Fetch(ctx, req)
r.AddError(err)
if r.Stats != nil && r.Response != nil {
logger.Debug("got response",
zap.Int("metrics_in_response", len(r.Response.Metrics)),
zap.Int("errors_count", len(r.Err)),
zap.Uint64("timeouts_count", r.Stats.Timeouts),
zap.Uint64("render_requests_count", r.Stats.RenderRequests),
zap.Uint64("render_errors_count", r.Stats.RenderErrors),
zap.Uint64("render_timeouts_count", r.Stats.RenderTimeouts),
zap.Uint64("zipper_requests_count", r.Stats.ZipperRequests),
zap.Uint64("total_metric_count", r.Stats.TotalMetricsCount),
zap.Int("servers_count", len(r.Stats.Servers)),
zap.Int("failed_servers_count", len(r.Stats.FailedServers)),
)
} else {
logger.Debug("got response",
zap.Bool("response_is_nil", r.Response == nil),
zap.Bool("stats_is_nil", r.Stats == nil),
zap.Any("err", err),
)
}
_ = response.Merge(r)
}
logger.Debug("got response (after merge)",
zap.Int("metrics_in_response", len(response.Response.Metrics)),
zap.Int("errors_count", len(response.Err)),
zap.Uint64("timeouts_count", response.Stats.Timeouts),
zap.Uint64("render_requests_count", response.Stats.RenderRequests),
zap.Uint64("render_errors_count", response.Stats.RenderErrors),
zap.Uint64("render_timeouts_count", response.Stats.RenderTimeouts),
zap.Uint64("zipper_requests_count", response.Stats.ZipperRequests),
zap.Uint64("total_metric_count", response.Stats.TotalMetricsCount),
zap.Int("servers_count", len(response.Stats.Servers)),
zap.Int("failed_servers_count", len(response.Stats.FailedServers)),
)
resCh <- response
}
func (bg *BroadcastGroup) splitRequest(ctx context.Context, request *protov3.MultiFetchRequest, backend types.BackendServer) ([]*protov3.MultiFetchRequest, merry.Error) {
if backend.MaxMetricsPerRequest() == 0 {
return []*protov3.MultiFetchRequest{request}, nil
}
var requests []*protov3.MultiFetchRequest
newRequest := &protov3.MultiFetchRequest{}
var err merry.Error
for _, metric := range request.Metrics {
if len(newRequest.Metrics) >= backend.MaxMetricsPerRequest() {
requests = append(requests, newRequest)
newRequest = &protov3.MultiFetchRequest{}
}
// TODO(Civil): Tags: improve logic
if strings.HasPrefix(metric.Name, "seriesByTag") {
newRequest.Metrics = append(newRequest.Metrics, protov3.FetchRequest{
Name: metric.PathExpression,
StartTime: metric.StartTime,
StopTime: metric.StopTime,
PathExpression: metric.PathExpression,
FilterFunctions: metric.FilterFunctions,
})
continue
}
// Do not send Find requests if we have neither globs in the request nor metric expansions
if !strings.ContainsAny(metric.Name, "*{") {
newRequest.Metrics = append(newRequest.Metrics, protov3.FetchRequest{
Name: metric.Name,
StartTime: metric.StartTime,
StopTime: metric.StopTime,
PathExpression: metric.PathExpression,
FilterFunctions: metric.FilterFunctions,
})
continue
}
f, _, e := backend.Find(ctx, &protov3.MultiGlobRequest{Metrics: []string{metric.Name}})
if e != nil || f == nil || len(f.Metrics) == 0 {
if e == nil {
e = merry.Errorf("no result fetched")
if f == nil {
e = e.WithCause(types.ErrUnmarshalFailed)
} else {
e = e.WithCause(types.ErrNoMetricsFetched)
}
}
err = e
errStr := ""
if e.Cause() != nil {
errStr = e.Cause().Error()
} else {
// e != nil, but len(f.Metrics) == 0 or f == nil, then Cause could be nil
errStr = e.Error()
}
if ce := bg.logger.Check(zap.DebugLevel, "find request failed when resolving globs (verbose)"); ce != nil {
ce.Write(
zap.String("metric_name", metric.Name),
zap.String("error", errStr),
zap.Any("stack", e),
)
} else {
bg.logger.Warn("find request failed when resolving globs",
zap.String("metric_name", metric.Name),
zap.String("error", errStr),
)
}
if f == nil {
continue
}
}
for _, m := range f.Metrics {
for _, match := range m.Matches {
if !match.IsLeaf {
continue
}
newRequest.Metrics = append(newRequest.Metrics, protov3.FetchRequest{
Name: match.Path,
StartTime: metric.StartTime,
StopTime: metric.StopTime,
PathExpression: metric.PathExpression,
FilterFunctions: metric.FilterFunctions,
})
if len(newRequest.Metrics) >= backend.MaxMetricsPerRequest() {
requests = append(requests, newRequest)
newRequest = &protov3.MultiFetchRequest{}
}
}
}
}
if len(newRequest.Metrics) > 0 {
requests = append(requests, newRequest)
}
return requests, err
}
func (bg *BroadcastGroup) Fetch(ctx context.Context, request *protov3.MultiFetchRequest) (*protov3.MultiFetchResponse, *types.Stats, merry.Error) {
requestNames := make([]string, 0, len(request.Metrics))
for i := range request.Metrics {
requestNames = append(requestNames, request.Metrics[i].Name)
}
logger := bg.logger.With(zap.String("type", "fetch"), zap.Strings("request", requestNames), zap.String("carbonapi_uuid", utilctx.GetUUID(ctx)))
logger.Debug("will try to fetch data")
backends := bg.filterServersByTLD(requestNames, bg.Children())
result := types.NewServerFetchResponse()
ctxNew, cancel := context.WithTimeout(ctx, bg.timeout.Render)
defer cancel()
resultNew, responseCount := types.DoRequest(ctxNew, logger, backends, result, request, bg.fetcher)
result, ok := resultNew.Self().(*types.ServerFetchResponse)
if !ok {
logger.Fatal("unhandled error in Fetch",
zap.Stack("stack"),
zap.String("got_type", fmt.Sprintf("%T", resultNew.Self())),
zap.String("expected_type", fmt.Sprintf("%T", result)),
)
}
if len(result.Response.Metrics) == 0 {
code, errors := helper.MergeHttpErrors(result.Err)
if len(errors) > 0 {
err := types.ErrFailedToFetch.WithHTTPCode(code).WithMessage(strings.Join(errors, "\n"))
logger.Debug("errors while fetching data from backends",
zap.Int("httpCode", code),
zap.Strings("errors", errors),
)
return nil, result.Stats, err
}
return nil, result.Stats, types.ErrNotFound.WithHTTPCode(404)
}
// Recalculate metrics start/step/stop parameters to avoid upstream misbehavior
for i, metric := range result.Response.Metrics {
result.Response.Metrics[i].StopTime = metric.StartTime + int64(len(metric.Values))*metric.StepTime
}
logger.Debug("got some fetch responses",
zap.Int("backends_count", len(backends)),
zap.Int("response_count", responseCount),
zap.Bool("have_errors", len(result.Err) != 0),
zap.Any("errors", result.Err),
zap.Int("metrics_in_response", len(result.Response.Metrics)),
)
var err merry.Error
if result.Err != nil && len(result.Err) > 0 {
err = types.ErrNonFatalErrors
for _, e := range result.Err {
err = err.WithCause(e)
}
}
return result.Response, result.Stats, err
}
// Find request handling
func (bg *BroadcastGroup) doFind(ctx context.Context, logger *zap.Logger, backend types.BackendServer, reqs interface{}, resCh chan types.ServerFetcherResponse) {
request, ok := reqs.(*protov3.MultiGlobRequest)
if !ok {
logger.Fatal("unhandled error",
zap.Stack("stack"),
zap.String("got_type", fmt.Sprintf("%T", reqs)),
zap.String("expected_type", fmt.Sprintf("%T", request)),
)
}
logger = logger.With(
zap.String("group_name", bg.groupName),
zap.String("backend_name", backend.Name()),
)
logger.Debug("waiting for a slot")
r := types.NewServerFindResponse()
r.Server = backend.Name()
if err := bg.limiter.Enter(ctx, backend.Name()); err != nil {
logger.Debug("timeout waiting for a slot")
r.AddError(merry.Prepend(err, "timeout waiting for slot"))
resCh <- r
return
}
logger.Debug("got slot")
defer bg.limiter.Leave(ctx, backend.Name())
var err merry.Error
r.Response, r.Stats, err = backend.Find(ctx, request)
r.AddError(err)
logger.Debug("fetched response",
zap.Any("response", r),
)
resCh <- r
}
func (bg *BroadcastGroup) Find(ctx context.Context, request *protov3.MultiGlobRequest) (*protov3.MultiGlobResponse, *types.Stats, merry.Error) {
logger := bg.logger.With(zap.String("type", "find"), zap.Strings("request", request.Metrics))
backends := bg.Children()
logger.Debug("will do query with timeout",
zap.Any("backends", backends),
zap.Float64("timeout", bg.timeout.Find.Seconds()),
)
ctxNew, cancel := context.WithTimeout(ctx, bg.timeout.Find)
defer cancel()
result := types.NewServerFindResponse()
result.Server = bg.Name()
result.Stats.ZipperRequests = uint64(len(backends))
resultNew, responseCount := types.DoRequest(ctxNew, logger, backends, result, request, bg.doFind)
result, ok := resultNew.Self().(*types.ServerFindResponse)
if !ok {
logger.Fatal("unhandled error in Find",
zap.Stack("stack"),
zap.String("got_type", fmt.Sprintf("%T", resultNew.Self())),
zap.String("expected_type", fmt.Sprintf("%T", result)),
)
}
if len(result.Response.Metrics) == 0 {
nonNotFoundErrors := types.ReturnNonNotFoundError(result.Err)
if nonNotFoundErrors != nil {
err := types.ErrFailedToFetch.WithHTTPCode(500)
for _, e := range nonNotFoundErrors {
err = err.WithCause(e)
}
logger.Debug("non-404 errors while fetching data from backends",
zap.Any("errors", result.Err),
)
return &protov3.MultiGlobResponse{}, result.Stats, err
}
return &protov3.MultiGlobResponse{}, result.Stats, types.ErrNotFound.WithHTTPCode(404)
}
result.Stats.TotalMetricsCount = 0
for _, x := range result.Response.Metrics {
result.Stats.TotalMetricsCount += uint64(len(x.Matches))
}
logger.Debug("got some find responses",
zap.Int("backends_count", len(backends)),
zap.Int("response_count", responseCount),
zap.Bool("have_errors", len(result.Err) != 0),
zap.Any("errors", result.Err),
zap.Any("response", result.Response),
)
var err merry.Error
if result.Err != nil {
err = types.ErrNonFatalErrors
for _, e := range result.Err {
err = err.WithCause(e)
}
}
return result.Response, result.Stats, err
}
// Info request handling
func (bg *BroadcastGroup) doInfoRequest(ctx context.Context, logger *zap.Logger, backend types.BackendServer, reqs interface{}, resCh chan types.ServerFetcherResponse) {
logger = logger.With(
zap.String("group_name", bg.groupName),
zap.String("backend_name", backend.Name()),
)
request, ok := reqs.(*protov3.MultiMetricsInfoRequest)
if !ok {
logger.Fatal("unhandled error",
zap.Stack("stack"),
zap.String("got_type", fmt.Sprintf("%T", reqs)),
zap.String("expected_type", fmt.Sprintf("%T", request)),
)
}
r := &types.ServerInfoResponse{
Server: backend.Name(),
}
if err := bg.limiter.Enter(ctx, backend.Name()); err != nil {
logger.Debug("timeout waiting for a slot")
r.AddError(merry.Prepend(err, "timeout waiting for slot"))
resCh <- r
return
}
defer bg.limiter.Leave(ctx, backend.Name())
logger.Debug("got a slot")
var err merry.Error
r.Response, r.Stats, err = backend.Info(ctx, request)
r.AddError(err)
resCh <- r
}
func (bg *BroadcastGroup) Info(ctx context.Context, request *protov3.MultiMetricsInfoRequest) (*protov3.ZipperInfoResponse, *types.Stats, merry.Error) {
logger := bg.logger.With(zap.String("type", "info"), zap.Strings("request", request.Names))
ctxNew, cancel := context.WithTimeout(ctx, bg.timeout.Render)
defer cancel()
backends := bg.Children()
result := types.NewServerInfoResponse()
result.Server = bg.Name()
result.Stats.ZipperRequests = uint64(len(backends))
resultNew, responseCount := types.DoRequest(ctxNew, logger, backends, result, request, bg.doInfoRequest)
result, ok := resultNew.Self().(*types.ServerInfoResponse)
if !ok {
logger.Fatal("unhandled error in Find",
zap.Stack("stack"),
zap.String("got_type", fmt.Sprintf("%T", resultNew.Self())),
zap.String("expected_type", fmt.Sprintf("%T", result)),
)
}
logger.Debug("got some responses",
zap.Int("backends_count", len(backends)),
zap.Int("response_count", responseCount),
zap.Bool("have_errors", len(result.Err) != 0),
)
var err merry.Error
if result.Err != nil {
err = types.ErrNonFatalErrors
for _, e := range result.Err {
err = err.WithCause(e)
}
}
return result.Response, result.Stats, err
}
func (bg *BroadcastGroup) List(ctx context.Context) (*protov3.ListMetricsResponse, *types.Stats, merry.Error) {
return nil, nil, types.ErrNotImplementedYet
}
func (bg *BroadcastGroup) Stats(ctx context.Context) (*protov3.MetricDetailsResponse, *types.Stats, merry.Error) {
return nil, nil, types.ErrNotImplementedYet
}
type tagQuery struct {
Query string
Limit int64
IsName bool
}
// Info request handling
func (bg *BroadcastGroup) doTagRequest(ctx context.Context, logger *zap.Logger, backend types.BackendServer, reqs interface{}, resCh chan types.ServerFetcherResponse) {
request, ok := reqs.(tagQuery)
logger = logger.With(
zap.String("group_name", bg.groupName),
zap.String("backend_name", backend.Name()),
)
if !ok {
logger.Fatal("unhandled error",
zap.Stack("stack"),
zap.String("got_type", fmt.Sprintf("%T", reqs)),
zap.String("expected_type", fmt.Sprintf("%T", request)),
)
}
r := &types.ServerTagResponse{
Server: backend.Name(),
Response: []string{},
}
logger.Debug("waiting for a slot")
if err := bg.limiter.Enter(ctx, backend.Name()); err != nil {
logger.Debug("timeout waiting for a slot")
r.AddError(merry.Prepend(err, "timeout waiting for slot"))
resCh <- r
return
}
defer bg.limiter.Leave(ctx, backend.Name())
logger.Debug("got a slot")
var err merry.Error
if request.IsName {
r.Response, err = backend.TagNames(ctx, request.Query, request.Limit)
} else {
r.Response, err = backend.TagValues(ctx, request.Query, request.Limit)
}
if err != nil {
r.AddError(err)
}
if r.Response == nil {
r.Response = []string{}
}
resCh <- r
}
func (bg *BroadcastGroup) tagEverything(ctx context.Context, isTagName bool, query string, limit int64) ([]string, merry.Error) {
logger := bg.logger.With(zap.String("query", query))
if isTagName {
logger = logger.With(zap.String("type", "tagName"))
} else {
logger = logger.With(zap.String("type", "tagValues"))
}
request := tagQuery{
Query: query,
Limit: limit,
IsName: isTagName,
}
ctxNew, cancel := context.WithTimeout(ctx, bg.timeout.Find)
defer cancel()
backends := bg.Children()
result := types.NewServerTagResponse()
result.Server = bg.Name()
resultNew, responseCount := types.DoRequest(ctxNew, logger, backends, result, request, bg.doTagRequest)
result, ok := resultNew.Self().(*types.ServerTagResponse)
if !ok {
logger.Fatal("unhandled error in Find",
zap.Stack("stack"),
zap.String("got_type", fmt.Sprintf("%T", resultNew.Self())),
zap.String("expected_type", fmt.Sprintf("%T", result)),
)
}
if limit != -1 && int64(len(result.Response)) > limit {
sort.Strings(result.Response)
result.Response = result.Response[:limit-1]
}
logger.Debug("got some responses",
zap.Int("backends_count", len(backends)),
zap.Int("response_count", responseCount),
zap.Bool("have_errors", len(result.Err) != 0),
)
var err merry.Error
if result.Err != nil {
err = types.ErrNonFatalErrors
for _, e := range result.Err {
err = err.WithCause(e)
}
}
return result.Response, err
}
func (bg *BroadcastGroup) TagNames(ctx context.Context, query string, limit int64) ([]string, merry.Error) {
return bg.tagEverything(ctx, true, query, limit)
}
func (bg *BroadcastGroup) TagValues(ctx context.Context, query string, limit int64) ([]string, merry.Error) {
return bg.tagEverything(ctx, false, query, limit)
}
type tldResponse struct {
server types.BackendServer
tlds []string
err merry.Error
}
func doProbe(ctx context.Context, backend types.BackendServer, resCh chan<- tldResponse) {
res, err := backend.ProbeTLDs(ctx)
resCh <- tldResponse{
server: backend,
tlds: res,
err: err,
}
}
func (bg *BroadcastGroup) ProbeTLDs(ctx context.Context) ([]string, merry.Error) {
logger := bg.logger.With(zap.String("function", "prober"))
ctx, cancel := context.WithTimeout(ctx, bg.timeout.Find)
defer cancel()
backends := bg.Children()
resCh := make(chan tldResponse, len(backends))
for _, backend := range backends {
go doProbe(ctx, backend, resCh)
}
responses := 0
var errs []merry.Error
answeredServers := make(map[string]struct{})
cache := make(map[string][]types.BackendServer)
tldSet := make(map[string]struct{})
GATHER:
for {
if responses == len(backends) {
break GATHER
}
select {
case r := <-resCh:
answeredServers[r.server.Name()] = struct{}{}
responses++
if r.err != nil {
errs = append(errs, r.err)
continue
}
for _, tld := range r.tlds {
tldSet[tld] = struct{}{}
cache[tld] = append(cache[tld], r.server)
}
case <-ctx.Done():
logger.Warn("timeout waiting for more responses",
zap.Strings("no_answers_from", types.NoAnswerBackends(backends, answeredServers)),
)
errs = append(errs, types.ErrTimeoutExceeded)
break GATHER
}
}
var tlds []string
for tld := range tldSet {
tlds = append(tlds, tld)
}
for k, v := range cache {
bg.pathCache.Set(k, v)
}
var err merry.Error
if errs != nil {
err = types.ErrNonFatalErrors
for _, e := range errs {
err = err.WithCause(e)
}
}
return tlds, err
}