102 lines
3 KiB
Go
102 lines
3 KiB
Go
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package e2eutil
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import (
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"fmt"
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"os/exec"
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"regexp"
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"strings"
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)
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// Command sends a command line argument to Nomad and returns the unbuffered
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// stdout as a string (or, if there's an error, the stderr)
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func Command(cmd string, args ...string) (string, error) {
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out, err := exec.Command(cmd, args...).CombinedOutput()
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return string(out), err
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}
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// GetField returns the value of an output field (ex. the "Submit Date" field
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// of `nomad job status :id`)
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func GetField(output, key string) (string, error) {
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re := regexp.MustCompile(`(?m)^` + key + ` += (.*)$`)
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match := re.FindStringSubmatch(output)
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if match == nil {
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return "", fmt.Errorf("could not find field %q", key)
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}
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return match[1], nil
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}
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// GetSection returns a section, with its field header but without its title.
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// (ex. the Allocations section of `nomad job status :id`)
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func GetSection(output, key string) (string, error) {
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// golang's regex engine doesn't support negative lookahead, so
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// we can't stop at 2 newlines if we also want a section that includes
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// single newlines. so split on the section title, and then split a second time
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// on \n\n
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re := regexp.MustCompile(`(?ms)^` + key + `\n(.*)`)
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match := re.FindStringSubmatch(output)
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if match == nil {
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return "", fmt.Errorf("could not find section %q", key)
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}
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tail := match[1]
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return strings.Split(tail, "\n\n")[0], nil
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}
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// ParseColumns maps the CLI output for a columized section (without title) to
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// a slice of key->value pairs for each row in that section.
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// (ex. the Allocations section of `nomad job status :id`)
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func ParseColumns(section string) ([]map[string]string, error) {
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parsed := []map[string]string{}
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// field names and values are deliminated by two or more spaces, but can have a
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// single space themselves. compress all the delimiters into a tab so we can
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// break the fields on that
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re := regexp.MustCompile(" {2,}")
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section = re.ReplaceAllString(section, "\t")
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rows := strings.Split(section, "\n")
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breakFields := func(row string) []string {
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return strings.FieldsFunc(row, func(c rune) bool { return c == '\t' })
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}
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fieldNames := breakFields(rows[0])
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for _, row := range rows[1:] {
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if row == "" {
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continue
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}
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r := map[string]string{}
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vals := breakFields(row)
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for i, val := range vals {
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if i >= len(fieldNames) {
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return parsed, fmt.Errorf("section is misaligned with header\n%v", section)
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}
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r[fieldNames[i]] = val
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}
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parsed = append(parsed, r)
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}
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return parsed, nil
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}
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// ParseFields maps the CLI output for a key-value section (without title) to
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// map of the key->value pairs in that section
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// (ex. the Latest Deployment section of `nomad job status :id`)
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func ParseFields(section string) (map[string]string, error) {
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parsed := map[string]string{}
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rows := strings.Split(strings.TrimSpace(section), "\n")
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for _, row := range rows {
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kv := strings.Split(row, "=")
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if len(kv) == 0 {
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continue
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}
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key := strings.TrimSpace(kv[0])
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if len(kv) == 1 {
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parsed[key] = ""
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} else {
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parsed[key] = strings.TrimSpace(strings.Join(kv[1:], " "))
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}
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}
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return parsed, nil
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}
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