VictoriaMetrics/app/vmalert/datasource/init.go

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package datasource
import (
"flag"
"fmt"
"net/http"
"strings"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vmalert/utils"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promauth"
)
var (
addr = flag.String("datasource.url", "", "VictoriaMetrics or vmselect url. Required parameter. "+
"E.g. http://127.0.0.1:8428")
appendTypePrefix = flag.Bool("datasource.appendTypePrefix", false, "Whether to add type prefix to -datasource.url based on the query type. Set to true if sending different query types to the vmselect URL.")
basicAuthUsername = flag.String("datasource.basicAuth.username", "", "Optional basic auth username for -datasource.url")
basicAuthPassword = flag.String("datasource.basicAuth.password", "", "Optional basic auth password for -datasource.url")
basicAuthPasswordFile = flag.String("datasource.basicAuth.passwordFile", "", "Optional path to basic auth password to use for -datasource.url")
bearerToken = flag.String("datasource.bearerToken", "", "Optional bearer auth token to use for -datasource.url.")
bearerTokenFile = flag.String("datasource.bearerTokenFile", "", "Optional path to bearer token file to use for -datasource.url.")
tlsInsecureSkipVerify = flag.Bool("datasource.tlsInsecureSkipVerify", false, "Whether to skip tls verification when connecting to -datasource.url")
tlsCertFile = flag.String("datasource.tlsCertFile", "", "Optional path to client-side TLS certificate file to use when connecting to -datasource.url")
tlsKeyFile = flag.String("datasource.tlsKeyFile", "", "Optional path to client-side TLS certificate key to use when connecting to -datasource.url")
tlsCAFile = flag.String("datasource.tlsCAFile", "", `Optional path to TLS CA file to use for verifying connections to -datasource.url. By default, system CA is used`)
tlsServerName = flag.String("datasource.tlsServerName", "", `Optional TLS server name to use for connections to -datasource.url. By default, the server name from -datasource.url is used`)
lookBack = flag.Duration("datasource.lookback", 0, `Lookback defines how far into the past to look when evaluating queries. For example, if the datasource.lookback=5m then param "time" with value now()-5m will be added to every query.`)
queryStep = flag.Duration("datasource.queryStep", 0, "queryStep defines how far a value can fallback to when evaluating queries. "+
"For example, if datasource.queryStep=15s then param \"step\" with value \"15s\" will be added to every query."+
"If queryStep isn't specified, rule's evaluationInterval will be used instead.")
maxIdleConnections = flag.Int("datasource.maxIdleConnections", 100, `Defines the number of idle (keep-alive connections) to each configured datasource. Consider setting this value equal to the value: groups_total * group.concurrency. Too low a value may result in a high number of sockets in TIME_WAIT state.`)
roundDigits = flag.Int("datasource.roundDigits", 0, `Adds "round_digits" GET param to datasource requests. `+
`In VM "round_digits" limits the number of digits after the decimal point in response values.`)
)
// Param represents an HTTP GET param
type Param struct {
Key, Value string
}
// Init creates a Querier from provided flag values.
// Provided extraParams will be added as GET params to
// each request.
func Init(extraParams []Param) (QuerierBuilder, error) {
if *addr == "" {
return nil, fmt.Errorf("datasource.url is empty")
}
tr, err := utils.Transport(*addr, *tlsCertFile, *tlsKeyFile, *tlsCAFile, *tlsServerName, *tlsInsecureSkipVerify)
if err != nil {
return nil, fmt.Errorf("failed to create transport: %w", err)
}
tr.MaxIdleConnsPerHost = *maxIdleConnections
if *roundDigits > 0 {
extraParams = append(extraParams, Param{
Key: "round_digits",
Value: fmt.Sprintf("%d", *roundDigits),
})
}
baCfg := &promauth.BasicAuthConfig{
Username: *basicAuthUsername,
Password: *basicAuthPassword,
PasswordFile: *basicAuthPasswordFile,
}
authCfg, err := promauth.NewConfig(".", nil, baCfg, *bearerToken, *bearerTokenFile, nil, nil)
if err != nil {
return nil, fmt.Errorf("failed to configure auth: %w", err)
}
return &VMStorage{
c: &http.Client{Transport: tr},
authCfg: authCfg,
datasourceURL: strings.TrimSuffix(*addr, "/"),
appendTypePrefix: *appendTypePrefix,
lookBack: *lookBack,
queryStep: *queryStep,
dataSourceType: NewPrometheusType(),
extraParams: extraParams,
}, nil
}