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api.go
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api.go
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package nomad
import (
"context"
"flag"
"fmt"
"net/http"
"os"
"strconv"
"strings"
"time"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promauth"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discoveryutils"
)
var waitTime = flag.Duration("promscrape.nomad.waitTime", 0, "Wait time used by Nomad service discovery. Default value is used if not set")
// apiConfig contains config for API server.
type apiConfig struct {
tagSeparator string
nomadWatcher *nomadWatcher
}
func (ac *apiConfig) mustStop() {
ac.nomadWatcher.mustStop()
}
var configMap = discoveryutils.NewConfigMap()
func getAPIConfig(sdc *SDConfig, baseDir string) (*apiConfig, error) {
v, err := configMap.Get(sdc, func() (interface{}, error) { return newAPIConfig(sdc, baseDir) })
if err != nil {
return nil, err
}
return v.(*apiConfig), nil
}
func newAPIConfig(sdc *SDConfig, baseDir string) (*apiConfig, error) {
hcc := sdc.HTTPClientConfig
token := os.Getenv("NOMAD_TOKEN")
if token != "" {
if hcc.BearerToken != nil {
return nil, fmt.Errorf("cannot set both NOMAD_TOKEN and bearer_token")
}
hcc.BearerToken = promauth.NewSecret(token)
}
ac, err := hcc.NewConfig(baseDir)
if err != nil {
return nil, fmt.Errorf("cannot parse auth config: %w", err)
}
apiServer := sdc.Server
if apiServer == "" {
apiServer = os.Getenv("NOMAD_ADDR")
if apiServer == "" {
apiServer = "localhost:4646"
}
}
if !strings.Contains(apiServer, "://") {
scheme := "http"
if hcc.TLSConfig != nil {
scheme = "https"
}
apiServer = scheme + "://" + apiServer
}
proxyAC, err := sdc.ProxyClientConfig.NewConfig(baseDir)
if err != nil {
return nil, fmt.Errorf("cannot parse proxy auth config: %w", err)
}
client, err := discoveryutils.NewClient(apiServer, ac, sdc.ProxyURL, proxyAC, sdc.HTTPClientConfig.FollowRedirects)
if err != nil {
return nil, fmt.Errorf("cannot create HTTP client for %q: %w", apiServer, err)
}
tagSeparator := ","
if sdc.TagSeparator != nil {
tagSeparator = *sdc.TagSeparator
}
namespace := sdc.Namespace
if namespace == "" {
namespace = os.Getenv("NOMAD_NAMESPACE")
}
region := sdc.Region
if region == "" {
region = os.Getenv("NOMAD_REGION")
if region == "" {
region = "global"
}
}
nw := newNomadWatcher(client, sdc, namespace, region)
cfg := &apiConfig{
tagSeparator: tagSeparator,
nomadWatcher: nw,
}
return cfg, nil
}
// maxWaitTime is duration for Nomad blocking request.
func maxWaitTime() time.Duration {
d := discoveryutils.BlockingClientReadTimeout
// Nomad adds random delay up to wait/16, so reduce the timeout in order to keep it below BlockingClientReadTimeout.
// See https://developer.hashicorp.com/nomad/api-docs#blocking-queries
d -= d / 16
// The timeout cannot exceed 10 minutes. See https://developer.hashicorp.com/nomad/api-docs#blocking-queries
if d > 10*time.Minute {
d = 10 * time.Minute
}
if *waitTime > time.Second && *waitTime < d {
d = *waitTime
}
return d
}
// getBlockingAPIResponse performs blocking request to Nomad via client and returns response.
// See https://developer.hashicorp.com/nomad/api-docs#blocking-queries .
func getBlockingAPIResponse(ctx context.Context, client *discoveryutils.Client, path string, index int64) ([]byte, int64, error) {
path += "&index=" + strconv.FormatInt(index, 10)
path += "&wait=" + fmt.Sprintf("%ds", int(maxWaitTime().Seconds()))
getMeta := func(resp *http.Response) {
ind := resp.Header.Get("X-Nomad-Index")
if len(ind) == 0 {
logger.Errorf("cannot find X-Nomad-Index header in response from %q", path)
return
}
newIndex, err := strconv.ParseInt(ind, 10, 64)
if err != nil {
logger.Errorf("cannot parse X-Nomad-Index header value in response from %q: %s", path, err)
return
}
// Properly handle the returned newIndex according to https://developer.hashicorp.com/nomad/api-docs#blocking-queries.
// Index implementation details are the same for Consul and Nomad: https://developer.hashicorp.com/consul/api-docs/features/blocking#implementation-details
if newIndex < 1 {
index = 1
return
}
if index > newIndex {
index = 0
return
}
index = newIndex
}
data, err := client.GetBlockingAPIResponseCtx(ctx, path, getMeta)
if err != nil {
return nil, index, fmt.Errorf("cannot perform blocking Nomad API request at %q: %w", path, err)
}
return data, index, nil
}