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version_check.go
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version_check.go
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/**
* @license
* Copyright 2020 Dynatrace LLC
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package rest
import (
"encoding/json"
"fmt"
"net/http"
"strconv"
"strings"
)
type Version struct {
Major int
Minor int
Patch int
}
func (v *Version) String() string {
return fmt.Sprintf("%d.%d.%d", v.Major, v.Minor, v.Patch)
}
type ApiVersionObject struct {
Version string `json:"version"`
}
const versionPath = "/api/v1/config/clusterversion"
func GetDynatraceVersion(client *http.Client, environmentUrl string, apiToken string) (Version, error) {
versionUrl := environmentUrl + versionPath
resp, err := get(client, versionUrl, apiToken)
if err != nil {
return Version{}, fmt.Errorf("failed to query version of Dynatrace environment: %w", err)
}
if resp.StatusCode != http.StatusOK {
return Version{}, fmt.Errorf("failed to query version of Dynatrace environment: (HTTP %v) %v", resp.StatusCode, string(resp.Body))
}
var jsonResp ApiVersionObject
if err := json.Unmarshal(resp.Body, &jsonResp); err != nil {
return Version{}, fmt.Errorf("failed to parse Dynatrace version JSON: %w", err)
}
return parseVersion(jsonResp.Version)
}
func MinimumDynatraceVersionReached(expectedMinVersion Version, currentVersion Version) bool {
if currentVersion.Major < expectedMinVersion.Major {
return false
}
if currentVersion.Major == expectedMinVersion.Major &&
currentVersion.Minor < expectedMinVersion.Minor {
return false
}
if currentVersion.Major == expectedMinVersion.Major &&
currentVersion.Minor == expectedMinVersion.Minor &&
currentVersion.Patch < expectedMinVersion.Patch {
return false
}
return true
}
// parseVersion turns a Dynatrace version string in the format MAJOR.MINOR.PATCH.DATE into a Version object
// for the version check purposes of monaco the build date part is ignored, assuming correct semantic versioning and
// not needing to check anything but >= feature versions for our compatibility usecases
func parseVersion(versionString string) (version Version, err error) {
split := strings.Split(versionString, ".")
if len(split) != 4 {
return version, fmt.Errorf("failed to parse Dynatrace version: format did not meet expected MAJOR.MINOR.PATCH.DATE pattern: %v", versionString)
}
version.Major, err = strconv.Atoi(split[0])
if err != nil {
return version, fmt.Errorf("failed to parse Dynatrace version: major %v is not a number", split[0])
}
version.Minor, err = strconv.Atoi(split[1])
if err != nil {
return version, fmt.Errorf("failed to parse Dynatrace version: minor %v is not a number", split[1])
}
version.Patch, err = strconv.Atoi(split[2])
if err != nil {
return version, fmt.Errorf("failed to parse Dynatrace version: patch %v is not a number", split[2])
}
return
}