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parser.go
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parser.go
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// pmm-managed
// Copyright (C) 2017 Percona LLC
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
// Package envvars contains environment variables parser.
package envvars
import (
"fmt"
"net"
"os"
"strconv"
"strings"
"time"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/percona/pmm-managed/models"
)
const (
defaultSaaSHost = "check.percona.com:443"
envSaaSHost = "PERCONA_TEST_SAAS_HOST"
// TODO REMOVE PERCONA_TEST_DBAAS IN FUTURE RELEASES.
envTestDbaas = "PERCONA_TEST_DBAAS"
envEnableDbaas = "ENABLE_DBAAS"
)
// InvalidDurationError invalid duration error.
type InvalidDurationError string
func (e InvalidDurationError) Error() string { return string(e) }
// ParseEnvVars parses given environment variables.
//
// Returns valid setting and two lists with errors and warnings.
// This function is mainly used in pmm-managed-init to early validate passed
// environment variables, and provide user warnings about unknown variables.
// In case of error, the docker run terminates.
// Short description of environment variables:
// - PATH, HOSTNAME, TERM, HOME are default environment variables that will be ignored;
// - DISABLE_UPDATES is a boolean flag to enable or disable pmm-server update;
// - DISABLE_TELEMETRY is a boolean flag to enable or disable pmm telemetry (and disable STT if telemetry is disabled);
// - METRICS_RESOLUTION, METRICS_RESOLUTION, METRICS_RESOLUTION_HR, METRICS_RESOLUTION_LR are durations of metrics resolution;
// - DATA_RETENTION is the duration of how long keep time-series data in ClickHouse;
// - ENABLE_ALERTING enables Integrated Alerting;
// - ENABLE_AZUREDISCOVER enables Azure Discover;
// - ENABLE_DBAAS enables Database as a Service feature, it's a replacement for deprecated PERCONA_TEST_DBAAS which still works but will be removed eventually;
// - the environment variables prefixed with GF_ passed as related to Grafana.
func ParseEnvVars(envs []string) (envSettings *models.ChangeSettingsParams, errs []error, warns []string) {
envSettings = new(models.ChangeSettingsParams)
for _, env := range envs {
p := strings.SplitN(env, "=", 2)
if len(p) != 2 {
errs = append(errs, fmt.Errorf("failed to parse environment variable %q", env))
continue
}
k, v := strings.ToUpper(p[0]), strings.ToLower(p[1])
logrus.Tracef("ParseEnvVars: %#q: k=%#q v=%#q", env, k, v)
var err error
switch k {
case "_", "HOME", "HOSTNAME", "LANG", "PATH", "PWD", "SHLVL", "TERM":
// skip default environment variables
continue
case "PMM_DEBUG", "PMM_TRACE":
// skip cross-component environment variables that are already handled by kingpin
continue
case "DISABLE_UPDATES":
envSettings.DisableUpdates, err = strconv.ParseBool(v)
if err != nil {
err = fmt.Errorf("invalid value %q for environment variable %q", v, k)
}
case "DISABLE_TELEMETRY":
envSettings.DisableTelemetry, err = strconv.ParseBool(v)
if err != nil {
err = fmt.Errorf("invalid value %q for environment variable %q", v, k)
} else if envSettings.DisableTelemetry {
// special case
envSettings.DisableSTT = true
}
case "METRICS_RESOLUTION", "METRICS_RESOLUTION_HR":
if envSettings.MetricsResolutions.HR, err = parseStringDuration(v); err != nil {
err = formatEnvVariableError(err, env, v)
}
case "METRICS_RESOLUTION_MR":
if envSettings.MetricsResolutions.MR, err = parseStringDuration(v); err != nil {
err = formatEnvVariableError(err, env, v)
}
case "METRICS_RESOLUTION_LR":
if envSettings.MetricsResolutions.LR, err = parseStringDuration(v); err != nil {
err = formatEnvVariableError(err, env, v)
}
case "DATA_RETENTION":
if envSettings.DataRetention, err = parseStringDuration(v); err != nil {
err = formatEnvVariableError(err, env, v)
}
case "ENABLE_VM_CACHE":
envSettings.EnableVMCache, err = strconv.ParseBool(v)
if err != nil {
err = fmt.Errorf("invalid value %q for environment variable %q", v, k)
}
if !envSettings.EnableVMCache {
// disable cache explicitly
envSettings.DisableVMCache = true
}
case "PERCONA_TEST_IA": // FIXME remove
warns = append(warns, fmt.Sprintf("Environment variable %q WILL BE REMOVED SOON, please use %q instead.", k, "ENABLE_ALERTING"))
fallthrough
case "ENABLE_ALERTING":
envSettings.EnableAlerting, err = strconv.ParseBool(v)
if err != nil {
err = fmt.Errorf("invalid value %q for environment variable %q", v, k)
}
case "ENABLE_AZUREDISCOVER":
envSettings.EnableAzurediscover, err = strconv.ParseBool(v)
if err != nil {
err = fmt.Errorf("invalid value %q for environment variable %q", v, k)
}
case "ENABLE_BACKUP_MANAGEMENT":
envSettings.EnableBackupManagement, err = strconv.ParseBool(v)
if err != nil {
err = fmt.Errorf("invalid value %q for environment variable %q", v, k)
}
case "PERCONA_TEST_AUTH_HOST", "PERCONA_TEST_CHECKS_HOST", "PERCONA_TEST_TELEMETRY_HOST":
err = fmt.Errorf("environment variable %q is removed and replaced by %q", k, envSaaSHost)
case envEnableDbaas, envTestDbaas:
envSettings.EnableDBaaS, err = strconv.ParseBool(v)
if err != nil {
err = fmt.Errorf("invalid value %q for environment variable %q", v, k)
errs = append(errs, err)
continue
}
envSettings.DisableDBaaS = !envSettings.EnableDBaaS
if k == envTestDbaas {
warns = append(warns, fmt.Sprintf("environment variable %q IS DEPRECATED AND WILL BE REMOVED, USE %q INSTEAD", envTestDbaas, envEnableDbaas))
}
default:
// handle prefixes
// skip Grafana's environment variables
if strings.HasPrefix(k, "GF_") {
continue
}
// skip supervisord environment variables
if strings.HasPrefix(k, "SUPERVISOR_") {
continue
}
if !strings.HasPrefix(k, "PERCONA_TEST_") {
warns = append(warns, fmt.Sprintf("unknown environment variable %q", env))
continue
}
warns = append(warns, fmt.Sprintf("environment variable %q IS NOT SUPPORTED and WILL BE REMOVED IN THE FUTURE", k))
}
if err != nil {
errs = append(errs, err)
}
}
return envSettings, errs, warns
}
// parseStringDuration validate duration as string value.
func parseStringDuration(value string) (time.Duration, error) {
d, err := time.ParseDuration(value)
if err != nil {
return d, InvalidDurationError("invalid duration error")
}
return d, nil
}
// GetSAASHost returns SaaS host env variable value if it's present and valid.
// Otherwise returns defaultSaaSHost.
func GetSAASHost() (string, error) {
v := os.Getenv(envSaaSHost)
host, err := parseSAASHost(v)
if err != nil {
return "", err
}
logrus.Infof("Using SaaS host %q.", host)
return host, nil
}
// parseSAASHost parses, validates and returns SAAS host, otherwise returns error.
func parseSAASHost(v string) (string, error) {
if v == "" {
logrus.Infof("Using default SaaS host %q.", defaultSaaSHost)
return defaultSaaSHost, nil
}
if strings.HasPrefix(v, ":") {
return "", fmt.Errorf("environment variable %q has invalid format %q. Expected host[:port]", envSaaSHost, v)
}
host, port, err := net.SplitHostPort(v)
if err != nil && strings.Count(v, ":") >= 1 {
return "", err
}
if host == "" {
host = v
}
if port == "" {
port = "443"
}
v = net.JoinHostPort(host, port)
return v, nil
}
func formatEnvVariableError(err error, env, value string) error {
switch e := err.(type) {
case InvalidDurationError:
return fmt.Errorf("environment variable %q has invalid duration %s", env, value)
default:
return errors.Wrap(e, "unknown error")
}
}