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refactor(pkg): rename internals so their names actually make sense

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A "program" was in fact a plugin, while a "plugin" represented the
plugin's results.
This commit is contained in:
Emmanuel BENOîT 2024-07-20 00:20:28 +02:00
parent ffbec78937
commit 1a29325c34
Signed by: Emmanuel BENOîT
SSH key fingerprint: SHA256:l7PFUUF5TCDsvYeQC9OnTNz08dFY7Fvf4Hv3neIqYpg
9 changed files with 189 additions and 179 deletions
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38
cmd/sslcert/main.go
View file

@ -16,7 +16,7 @@ import (
"nocternity.net/gomonop/pkg/perfdata"
"nocternity.net/gomonop/pkg/plugin"
"nocternity.net/gomonop/pkg/program"
"nocternity.net/gomonop/pkg/results"
)
//--------------------------------------------------------------------------------------------------------
@ -167,7 +167,7 @@ type programFlags struct {
// Program data including configuration and runtime data.
type checkProgram struct {
programFlags // Flags from the command line
plugin *plugin.Plugin // Plugin output state
plugin *results.Results // Plugin output state
certificate *x509.Certificate // X.509 certificate from the server
}
@ -207,16 +207,16 @@ func (flags *programFlags) parseArguments() {
}
// Initialise the monitoring check program.
func NewProgram() program.Program {
func NewProgram() plugin.Plugin {
program := &checkProgram{
plugin: plugin.New("Certificate check"),
plugin: results.New("Certificate check"),
}
program.parseArguments()
return program
}
// Return the program's output value.
func (program *checkProgram) Output() *plugin.Plugin {
func (program *checkProgram) Results() *results.Results {
return program.plugin
}
@ -224,20 +224,20 @@ func (program *checkProgram) Output() *plugin.Plugin {
// if the arguments made sense.
func (program *checkProgram) CheckArguments() bool {
if program.hostname == "" {
program.plugin.SetState(plugin.StatusUnknown, "no hostname specified")
program.plugin.SetState(results.StatusUnknown, "no hostname specified")
return false
}
if program.port < 1 || program.port > 65535 {
program.plugin.SetState(plugin.StatusUnknown, "invalid or missing port number")
program.plugin.SetState(results.StatusUnknown, "invalid or missing port number")
return false
}
if program.warn != -1 && program.crit != -1 && program.warn <= program.crit {
program.plugin.SetState(plugin.StatusUnknown, "nonsensical thresholds")
program.plugin.SetState(results.StatusUnknown, "nonsensical thresholds")
return false
}
if _, ok := certGetters[program.startTLS]; !ok {
errstr := "unsupported StartTLS protocol " + program.startTLS
program.plugin.SetState(plugin.StatusUnknown, errstr)
program.plugin.SetState(results.StatusUnknown, errstr)
return false
}
program.hostname = strings.ToLower(program.hostname)
@ -262,13 +262,13 @@ func (program *checkProgram) getCertificate() error {
// matches the requested host name.
func (program *checkProgram) checkSANlessCertificate() bool {
if !program.ignoreCnOnly || len(program.extraNames) != 0 {
program.plugin.SetState(plugin.StatusWarning,
program.plugin.SetState(results.StatusWarning,
"certificate doesn't have SAN domain names")
return false
}
dn := strings.ToLower(program.certificate.Subject.String())
if !strings.HasPrefix(dn, fmt.Sprintf("cn=%s,", program.hostname)) {
program.plugin.SetState(plugin.StatusCritical, "incorrect certificate CN")
program.plugin.SetState(results.StatusCritical, "incorrect certificate CN")
return false
}
return true
@ -298,7 +298,7 @@ func (program *checkProgram) checkNames() bool {
certificateIsOk = program.checkHostName(name) && certificateIsOk
}
if !certificateIsOk {
program.plugin.SetState(plugin.StatusCritical, "names missing from SAN domain names")
program.plugin.SetState(results.StatusCritical, "names missing from SAN domain names")
}
return certificateIsOk
}
@ -306,26 +306,26 @@ func (program *checkProgram) checkNames() bool {
// Check a certificate's time to expiry against the warning and critical
// thresholds, returning a status code and description based on these
// values.
func (program *checkProgram) checkCertificateExpiry(tlDays int) (plugin.Status, string) {
func (program *checkProgram) checkCertificateExpiry(tlDays int) (results.Status, string) {
if tlDays <= 0 {
return plugin.StatusCritical, "certificate expired"
return results.StatusCritical, "certificate expired"
}
var limitStr string
var state plugin.Status
var state results.Status
switch {
case program.crit > 0 && tlDays <= program.crit:
limitStr = fmt.Sprintf(" (<= %d)", program.crit)
state = plugin.StatusCritical
state = results.StatusCritical
case program.warn > 0 && tlDays <= program.warn:
limitStr = fmt.Sprintf(" (<= %d)", program.warn)
state = plugin.StatusWarning
state = results.StatusWarning
default:
limitStr = ""
state = plugin.StatusOK
state = results.StatusOK
}
statusString := fmt.Sprintf("certificate will expire in %d days%s",
@ -351,7 +351,7 @@ func (program *checkProgram) setPerfData(tlDays int) {
func (program *checkProgram) RunCheck() {
err := program.getCertificate()
if err != nil {
program.plugin.SetState(plugin.StatusUnknown, err.Error())
program.plugin.SetState(results.StatusUnknown, err.Error())
} else if program.checkNames() {
timeLeft := time.Until(program.certificate.NotAfter)
tlDays := int((timeLeft + 86399*time.Second) / (24 * time.Hour))

26
cmd/zoneserial/main.go
View file

@ -14,7 +14,7 @@ import (
"nocternity.net/gomonop/pkg/perfdata"
"nocternity.net/gomonop/pkg/plugin"
"nocternity.net/gomonop/pkg/program"
"nocternity.net/gomonop/pkg/results"
)
//-------------------------------------------------------------------------------------------------------
@ -56,7 +56,7 @@ type programFlags struct {
// Program data including configuration and runtime data.
type checkProgram struct {
programFlags // Flags from the command line
plugin *plugin.Plugin // Plugin output state
plugin *results.Results // Plugin output state
}
// Parse command line arguments and store their values. If the -h flag is present,
@ -77,39 +77,39 @@ func (flags *programFlags) parseArguments() {
}
// Initialise the monitoring check program.
func NewProgram() program.Program {
func NewProgram() plugin.Plugin {
program := &checkProgram{
plugin: plugin.New("DNS zone serial match check"),
plugin: results.New("DNS zone serial match check"),
}
program.parseArguments()
return program
}
// Return the program's output value.
func (program *checkProgram) Output() *plugin.Plugin {
func (program *checkProgram) Results() *results.Results {
return program.plugin
}
// Check the values that were specified from the command line. Returns true if the arguments made sense.
func (program *checkProgram) CheckArguments() bool {
if program.hostname == "" {
program.plugin.SetState(plugin.StatusUnknown, "no DNS hostname specified")
program.plugin.SetState(results.StatusUnknown, "no DNS hostname specified")
return false
}
if program.port < 1 || program.port > 65535 {
program.plugin.SetState(plugin.StatusUnknown, "invalid DNS port number")
program.plugin.SetState(results.StatusUnknown, "invalid DNS port number")
return false
}
if program.zone == "" {
program.plugin.SetState(plugin.StatusUnknown, "no DNS zone specified")
program.plugin.SetState(results.StatusUnknown, "no DNS zone specified")
return false
}
if program.rsHostname == "" {
program.plugin.SetState(plugin.StatusUnknown, "no reference DNS hostname specified")
program.plugin.SetState(results.StatusUnknown, "no reference DNS hostname specified")
return false
}
if program.rsPort < 1 || program.rsPort > 65535 {
program.plugin.SetState(plugin.StatusUnknown, "invalid reference DNS port number")
program.plugin.SetState(results.StatusUnknown, "invalid reference DNS port number")
return false
}
program.hostname = strings.ToLower(program.hostname)
@ -176,12 +176,12 @@ func (program *checkProgram) RunCheck() {
cOk, cSerial := program.getSerial("checked", checkResponse)
rOk, rSerial := program.getSerial("reference", refResponse)
if !(cOk && rOk) {
program.plugin.SetState(plugin.StatusUnknown, "could not read serials")
program.plugin.SetState(results.StatusUnknown, "could not read serials")
return
}
if cSerial == rSerial {
program.plugin.SetState(plugin.StatusOK, "serials match")
program.plugin.SetState(results.StatusOK, "serials match")
} else {
program.plugin.SetState(plugin.StatusCritical, "serials mismatch")
program.plugin.SetState(results.StatusCritical, "serials mismatch")
}
}

30
main.go
View file

@ -8,33 +8,33 @@ import (
"nocternity.net/gomonop/cmd/sslcert"
"nocternity.net/gomonop/cmd/zoneserial"
"nocternity.net/gomonop/pkg/plugin"
"nocternity.net/gomonop/pkg/program"
"nocternity.net/gomonop/pkg/results"
"nocternity.net/gomonop/pkg/version"
)
var (
programs map[string]program.Builder = map[string]program.Builder{
plugins map[string]plugin.Builder = map[string]plugin.Builder{
"check_ssl_certificate": sslcert.NewProgram,
"check_zone_serial": zoneserial.NewProgram,
}
)
func getProgram() program.Program {
func getPlugin() plugin.Plugin {
ownName := filepath.Base(os.Args[0])
if builder, ok := programs[ownName]; ok {
if builder, ok := plugins[ownName]; ok {
return builder()
}
if len(os.Args) < 2 {
fmt.Printf("Syntax: %s <program> [arguments]\n", ownName)
fmt.Printf(" %s --programs|-p\n", ownName)
fmt.Printf("Syntax: %s <plugin> [arguments]\n", ownName)
fmt.Printf(" %s --plugin|-p\n", ownName)
fmt.Printf(" %s --version|-v", ownName)
}
switch os.Args[1] {
case "--programs", "-p":
for name := range programs {
case "--plugins", "-p":
for name := range plugins {
fmt.Println(name)
}
os.Exit(0)
@ -44,30 +44,30 @@ func getProgram() program.Program {
os.Exit(0)
}
if builder, ok := programs[os.Args[1]]; ok {
if builder, ok := plugins[os.Args[1]]; ok {
os.Args = os.Args[1:]
return builder()
}
fmt.Printf("Unknown program: %s\n", os.Args[1])
fmt.Printf("Unknown plugin: %s\n", os.Args[1])
os.Exit(1)
return nil
}
func main() {
program := getProgram()
runPlugin := getPlugin()
output := program.Output()
output := runPlugin.Results()
defer func() {
if r := recover(); r != nil {
output.SetState(plugin.StatusUnknown, "Internal error")
output.SetState(results.StatusUnknown, "Internal error")
output.AddLinef("Error info: %v", r)
}
fmt.Println(output.String())
os.Exit(output.ExitCode())
}()
if program.CheckArguments() {
program.RunCheck()
if runPlugin.CheckArguments() {
runPlugin.RunCheck()
}
}

114
pkg/plugin/plugin.go
View file

@ -1,106 +1,20 @@
// Package plugin implements a helper that can be used to implement a Nagios,
// Centreon, Icinga... service monitoring plugin.
package plugin // import nocternity.net/gomonop/pkg/plugin
import (
"container/list"
"fmt"
"strings"
import "nocternity.net/gomonop/pkg/results"
"nocternity.net/gomonop/pkg/perfdata"
)
// Plugin represents the interface to a monitoring plugin.
type Plugin interface {
// Results accesses the results of the monitoring plugin.
Results() *results.Results
// Plugin represents the monitoring plugin's state, including its name,
// return status and message, additional lines of text, and performance
// data to be encoded in the output.
type Plugin struct {
name string
status Status
message string
extraText *list.List
perfData map[string]*perfdata.PerfData
// CheckArguments ensures that the arguments that were passed to the plugin
// actually make sense. Errors should be stored in the plugin's results.
CheckArguments() bool
// RunCheck actually runs whatever checks are implemented by the plugin and
// updates the results accordingly.
RunCheck()
}
// New creates the plugin with `name` as its name and an unknown status.
func New(name string) *Plugin {
p := new(Plugin)
p.name = name
p.status = StatusUnknown
p.message = "no status set"
p.perfData = make(map[string]*perfdata.PerfData)
return p
}
// SetState sets the plugin's output code to `status` and its message to
// the specified `message`.
func (p *Plugin) SetState(status Status, message string) {
p.status = status
p.message = message
}
// AddLine adds the specified string to the extra output text buffer.
func (p *Plugin) AddLine(line string) {
if p.extraText == nil {
p.extraText = list.New()
}
p.extraText.PushBack(line)
}
// AddLinef formats the input and adds it to the text buffer.
func (p *Plugin) AddLinef(format string, data ...interface{}) {
p.AddLine(fmt.Sprintf(format, data...))
}
// AddLines add the specified `lines` to the output text.
func (p *Plugin) AddLines(lines []string) {
for _, line := range lines {
p.AddLine(line)
}
}
// AddPerfData adds performance data described by the "pd" argument to the
// output's performance data. If two performance data records are added for
// the same label, the program panics.
func (p *Plugin) AddPerfData(pd *perfdata.PerfData) {
_, exists := p.perfData[pd.Label]
if exists {
panic("duplicate performance data " + pd.Label)
}
p.perfData[pd.Label] = pd
}
// String generates the plugin's text output from its name, status, text data
// and performance data.
func (p *Plugin) String() string {
var strBuilder strings.Builder
strBuilder.WriteString(p.name)
strBuilder.WriteString(" ")
strBuilder.WriteString(p.status.String())
strBuilder.WriteString(": ")
strBuilder.WriteString(p.message)
if len(p.perfData) > 0 {
strBuilder.WriteString(" | ")
needSep := false
for _, data := range p.perfData {
if needSep {
strBuilder.WriteString(", ")
} else {
needSep = true
}
strBuilder.WriteString(data.String())
}
}
if p.extraText != nil {
for em := p.extraText.Front(); em != nil; em = em.Next() {
strBuilder.WriteString("\n")
//nolint:forcetypeassert // we want to panic if this isn't a string
strBuilder.WriteString(em.Value.(string))
}
}
return strBuilder.String()
}
// ExitCode returns the plugin's exit code.
func (p *Plugin) ExitCode() int {
return int(p.status)
}
// Builder is a function that can be called in order to instantiate a plugin.
type Builder func() Plugin

11
pkg/program/program.go
View file

@ -1,11 +0,0 @@
package program // import nocternity.net/gomonop/pkg/program
import "nocternity.net/gomonop/pkg/plugin"
type Program interface {
Output() *plugin.Plugin
CheckArguments() bool
RunCheck()
}
type Builder func() Program

107
pkg/results/results.go Normal file
View file

@ -0,0 +1,107 @@
// Package results implements a helper that can be used to store the results of
// a Nagios, Centreon, Icinga... service monitoring plugin, and convert them to
// text which can be sent to the monitoring server.
package results // import nocternity.net/gomonop/pkg/results
import (
"container/list"
"fmt"
"strings"
"nocternity.net/gomonop/pkg/perfdata"
)
// Results represents the monitoring plugin's results, including its name,
// return status and message, additional lines of text, and performance
// data to be encoded in the output.
type Results struct {
name string
status Status
message string
extraText *list.List
perfData map[string]*perfdata.PerfData
}
// New creates the plugin with `name` as its name and an unknown status.
func New(name string) *Results {
p := new(Results)
p.name = name
p.status = StatusUnknown
p.message = "no status set"
p.perfData = make(map[string]*perfdata.PerfData)
return p
}
// SetState sets the plugin's output code to `status` and its message to
// the specified `message`.
func (p *Results) SetState(status Status, message string) {
p.status = status
p.message = message
}
// AddLine adds the specified string to the extra output text buffer.
func (p *Results) AddLine(line string) {
if p.extraText == nil {
p.extraText = list.New()
}
p.extraText.PushBack(line)
}
// AddLinef formats the input and adds it to the text buffer.
func (p *Results) AddLinef(format string, data ...interface{}) {
p.AddLine(fmt.Sprintf(format, data...))
}
// AddLines add the specified `lines` to the output text.
func (p *Results) AddLines(lines []string) {
for _, line := range lines {
p.AddLine(line)
}
}
// AddPerfData adds performance data described by the "pd" argument to the
// output's performance data. If two performance data records are added for
// the same label, the program panics.
func (p *Results) AddPerfData(pd *perfdata.PerfData) {
_, exists := p.perfData[pd.Label]
if exists {
panic("duplicate performance data " + pd.Label)
}
p.perfData[pd.Label] = pd
}
// String generates the plugin's text output from its name, status, text data
// and performance data.
func (p *Results) String() string {
var strBuilder strings.Builder
strBuilder.WriteString(p.name)
strBuilder.WriteString(" ")
strBuilder.WriteString(p.status.String())
strBuilder.WriteString(": ")
strBuilder.WriteString(p.message)
if len(p.perfData) > 0 {
strBuilder.WriteString(" | ")
needSep := false
for _, data := range p.perfData {
if needSep {
strBuilder.WriteString(", ")
} else {
needSep = true
}
strBuilder.WriteString(data.String())
}
}
if p.extraText != nil {
for em := p.extraText.Front(); em != nil; em = em.Next() {
strBuilder.WriteString("\n")
//nolint:forcetypeassert // we want to panic if this isn't a string
strBuilder.WriteString(em.Value.(string))
}
}
return strBuilder.String()
}
// ExitCode returns the plugin's exit code.
func (p *Results) ExitCode() int {
return int(p.status)
}

36
pkg/plugin/plugin_test.go → pkg/results/results_test.go
View file

@ -1,4 +1,4 @@
package plugin // import nocternity.net/gomonop/pkg/plugin
package results // import nocternity.net/gomonop/pkg/results
import (
"container/list"
@ -19,7 +19,7 @@ func TestNew(t *testing.T) {
}
func TestSetState(t *testing.T) {
p := Plugin{}
p := Results{}
p.SetState(StatusWarning, "test")
@ -28,7 +28,7 @@ func TestSetState(t *testing.T) {
}
func TestAddLineFirst(t *testing.T) {
p := Plugin{}
p := Results{}
p.AddLine("test")
@ -38,7 +38,7 @@ func TestAddLineFirst(t *testing.T) {
}
func TestAddLineNext(t *testing.T) {
p := Plugin{}
p := Results{}
p.extraText = list.New()
p.AddLine("test")
@ -48,7 +48,7 @@ func TestAddLineNext(t *testing.T) {
}
func TestAddLinef(t *testing.T) {
p := Plugin{}
p := Results{}
p.AddLinef("test %d", 123)
@ -57,7 +57,7 @@ func TestAddLinef(t *testing.T) {
}
func TestAddLines(t *testing.T) {
p := Plugin{}
p := Results{}
p.AddLines([]string{"test", "test2"})
@ -67,7 +67,7 @@ func TestAddLines(t *testing.T) {
}
func TestAddPerfData(t *testing.T) {
p := Plugin{}
p := Results{}
p.perfData = make(map[string]*perfdata.PerfData)
p.AddPerfData(&perfdata.PerfData{Label: "test"})
@ -78,7 +78,7 @@ func TestAddPerfData(t *testing.T) {
}
func TestAddPerfDataDuplicate(t *testing.T) {
p := Plugin{}
p := Results{}
p.perfData = make(map[string]*perfdata.PerfData)
p.perfData["test"] = &perfdata.PerfData{Label: "test"}
@ -87,14 +87,14 @@ func TestAddPerfDataDuplicate(t *testing.T) {
func TestString(t *testing.T) {
type Test struct {
Plugin
Results
expected string
}
pdat := perfdata.PerfData{Label: "test"}
tests := []Test{
{
Plugin{
Results{
name: "test",
status: StatusWarning,
message: "test",
@ -103,8 +103,8 @@ func TestString(t *testing.T) {
"test WARNING: test",
},
{
func() Plugin {
p := Plugin{
func() Results {
p := Results{
name: "test",
status: StatusWarning,
message: "test",
@ -118,8 +118,8 @@ func TestString(t *testing.T) {
"test WARNING: test\ntest 1\ntest 2",
},
{
func() Plugin {
p := Plugin{
func() Results {
p := Results{
name: "test",
status: StatusWarning,
message: "test",
@ -133,8 +133,8 @@ func TestString(t *testing.T) {
pdat.String(),
},
{
func() Plugin {
p := Plugin{
func() Results {
p := Results{
name: "test",
status: StatusWarning,
message: "test",
@ -153,13 +153,13 @@ func TestString(t *testing.T) {
}
for _, test := range tests {
result := test.Plugin.String()
result := test.Results.String()
assert.Equal(t, test.expected, result, "Expected '%s', got '%s'", test.expected, result)
}
}
func TestExitCode(t *testing.T) {
p := Plugin{}
p := Results{}
p.status = StatusOK
assert.Equal(t, int(StatusOK), p.ExitCode())

2
pkg/plugin/status.go → pkg/results/status.go
View file

@ -1,4 +1,4 @@
package plugin // import nocternity.net/gomonop/pkg/plugin
package results // import nocternity.net/gomonop/pkg/results
// Status represents the return status of the monitoring plugin. The
// corresponding integer value will be used as the program's exit code,

2
pkg/plugin/status_test.go → pkg/results/status_test.go
View file

@ -1,4 +1,4 @@
package plugin // import nocternity.net/gomonop/pkg/plugin
package results // import nocternity.net/gomonop/pkg/results
import (
"testing"