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/
errors.go
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/
errors.go
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// Copyright (c) 2018 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 terraformer
import (
"fmt"
"regexp"
"sort"
"strings"
)
// retrieveTerraformErrors gets a map <logList> whose keys are pod names and whose values are the corresponding logs,
// and it parses the logs for Terraform errors. If none are found, it will return nil, and otherwise the list of
// found errors as string slice.
func retrieveTerraformErrors(logList map[string]string) []string {
var (
foundErrors = map[string]string{}
errorList = []string{}
)
for podName, output := range logList {
errorMessage := findTerraformErrors(output)
// Add the errorMessage to the list of found errors (only if it does not already exist).
if _, ok := foundErrors[errorMessage]; !ok && errorMessage != "" {
foundErrors[errorMessage] = podName
}
}
for errorMessage, podName := range foundErrors {
errorList = append(errorList, fmt.Sprintf("-> Pod '%s' reported:\n%s", podName, errorMessage))
}
if len(errorList) == 0 {
return nil
}
return errorList
}
// findTerraformErrors gets the <output> of a Terraform run and parses it to find the occurred
// errors (which will be returned). If no errors occurred, an empty string will be returned.
func findTerraformErrors(output string) string {
var (
regexTerraformError = regexp.MustCompile(`(?:Error): *([\s\S]*)`)
regexUUID = regexp.MustCompile(`(?i)[0-9a-f]{8}(?:-[0-9a-f]{4}){3}-[0-9a-f]{12}`)
regexMultiNewline = regexp.MustCompile(`\n{2,}`)
errorMessage = output
valid = []string{}
)
// Strip optional explanation how Terraform behaves in case of errors.
if suffixIndex := strings.Index(errorMessage, "\n\nTerraform does not automatically rollback"); suffixIndex != -1 {
errorMessage = errorMessage[:suffixIndex]
}
// Strip optional explanation that nothing will happen.
if suffixIndex := strings.Index(errorMessage, "\n\nNothing to do."); suffixIndex != -1 {
errorMessage = errorMessage[:suffixIndex]
}
// Search for errors in Terraform output.
if terraformErrorMatch := regexTerraformError.FindStringSubmatch(errorMessage); len(terraformErrorMatch) > 1 {
// Remove leading and tailing spaces and newlines.
errorMessage = strings.TrimSpace(terraformErrorMatch[0])
// Omit (request) uuid's to allow easy determination of duplicates.
errorMessage = regexUUID.ReplaceAllString(errorMessage, "<omitted>")
// Get all errors
var currentError string
for _, line := range strings.Split(errorMessage, "\n") {
if strings.HasPrefix(line, "Error: ") {
if len(currentError) > 0 {
valid = append(valid, currentError)
currentError = ""
}
line = strings.TrimPrefix(line, "Error: ")
}
currentError += line + "\n"
}
if len(currentError) > 0 {
valid = append(valid, currentError)
}
// Sort the occurred errors alphabetically
sort.Strings(valid)
errorMessage = "* " + strings.Join(valid, "\n* ")
// Strip multiple newlines to one newline
errorMessage = regexMultiNewline.ReplaceAllString(errorMessage, "\n")
// Remove leading and tailing spaces and newlines.
errorMessage = strings.TrimSpace(errorMessage)
return errorMessage
}
return ""
}