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remote_querier.go
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remote_querier.go
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package storage
import (
"context"
"math"
"time"
"github.com/cloudfoundry/metric-store-release/src/internal/api"
shared_api "github.com/cloudfoundry/metric-store-release/src/internal/api"
shared_tls "github.com/cloudfoundry/metric-store-release/src/internal/tls"
"github.com/cloudfoundry/metric-store-release/src/pkg/logger"
prom_api_client "github.com/prometheus/client_golang/api/prometheus/v1"
config_util "github.com/prometheus/common/config"
"github.com/prometheus/prometheus/model/labels"
prom_storage "github.com/prometheus/prometheus/storage"
"github.com/prometheus/prometheus/storage/remote"
)
type RemoteQuerier struct {
ctx context.Context
index int
addr string
publicClient remote.ReadClient
privateClient prom_api_client.API
log *logger.Logger
minTime time.Time
maxTime time.Time
}
func NewRemoteQuerier(
ctx context.Context,
index int,
addr string,
egressTLSConfig *config_util.TLSConfig,
logger *logger.Logger,
) (prom_storage.Querier, error) {
// TODO - remote query timeout should probably not be a hardcoded value?
publicClient, err := api.NewPromReadClient(
index,
addr,
30*time.Second,
egressTLSConfig,
)
if err != nil {
return nil, err
}
privateTLSConfig, err := shared_tls.NewMutualTLSClientConfig(
egressTLSConfig.CAFile,
egressTLSConfig.CertFile,
egressTLSConfig.KeyFile,
egressTLSConfig.ServerName,
)
if err != nil {
return nil, err
}
privateClient, err := shared_api.NewPromHTTPClient(
addr,
"/private",
privateTLSConfig,
)
if err != nil {
return nil, err
}
minTime := time.Unix(math.MinInt64/1000+62135596801, 0).UTC()
maxTime := time.Unix(math.MaxInt64/1000-62135596801, 999999999).UTC()
querier := &RemoteQuerier{
ctx: ctx,
index: index,
addr: addr,
publicClient: publicClient,
privateClient: privateClient,
log: logger,
minTime: minTime,
maxTime: maxTime,
}
return querier, nil
}
func (r *RemoteQuerier) Select(sortSeries bool, params *prom_storage.SelectHints, matchers ...*labels.Matcher) prom_storage.SeriesSet {
query, err := remote.ToQuery(0, 0, matchers, params)
if err != nil {
return nil
}
res, err := r.publicClient.Read(r.ctx, query)
if err != nil {
return nil
}
return remote.FromQueryResult(sortSeries, res)
}
func (r *RemoteQuerier) LabelValues(name string, matchers ...*labels.Matcher) ([]string,
prom_storage.Warnings, error) {
var results []string
result := make([]string, len(matchers))
for i, matcher := range matchers {
result[i] = matcher.String()
}
labelValuesResult, _, err := r.privateClient.LabelValues(r.ctx, name, result, r.minTime,
r.maxTime)
if err != nil {
return nil, nil, err
}
for _, labelValue := range labelValuesResult {
results = append(results, string(labelValue))
}
return results, nil, nil
}
func (r *RemoteQuerier) LabelNames(matchers ...*labels.Matcher) ([]string, prom_storage.Warnings, error) {
result := make([]string, len(matchers))
for i, matcher := range matchers {
result[i] = matcher.String()
}
res, _, err := r.privateClient.LabelNames(r.ctx, result, r.minTime, r.maxTime)
return res, nil, err
}
func (r *RemoteQuerier) Close() error {
return nil
}