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package goss
import (
"bytes"
"fmt"
"log"
"net/http"
"strings"
"sync"
"time"
"github.com/fatih/color"
"github.com/goss-org/goss/outputs"
"github.com/goss-org/goss/resource"
"github.com/goss-org/goss/system"
"github.com/goss-org/goss/util"
"github.com/patrickmn/go-cache"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
func Serve(c *util.Config) error {
err := setLogLevel(c)
if err != nil {
return err
}
endpoint := c.Endpoint
health, err := newHealthHandler(c)
if err != nil {
return err
}
http.Handle(endpoint, health)
http.Handle("/metrics", promhttp.Handler())
log.Printf("[INFO] Starting to listen on: %s", c.ListenAddress)
return http.ListenAndServe(c.ListenAddress, nil)
}
func newHealthHandler(c *util.Config) (*healthHandler, error) {
color.NoColor = true
cache := cache.New(c.Cache, 30*time.Second)
cfg, err := getGossConfig(c.Vars, c.VarsInline, c.Spec)
if err != nil {
return nil, err
}
output, err := getOutputer(c.NoColor, c.OutputFormat)
if err != nil {
return nil, err
}
health := &healthHandler{
c: c,
gossConfig: *cfg,
sys: system.New(c.PackageManager),
outputer: output,
cache: cache,
gossMu: &sync.Mutex{},
maxConcurrent: c.MaxConcurrent,
}
return health, nil
}
type res struct {
body bytes.Buffer
statusCode int
}
type healthHandler struct {
c *util.Config
gossConfig GossConfig
sys *system.System
outputer outputs.Outputer
cache *cache.Cache
gossMu *sync.Mutex
maxConcurrent int
}
func (h healthHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
outputFormat, outputer, err := h.negotiateResponseContentType(r)
if err != nil {
log.Printf("[DEBUG] Warn: Using process-level output-format. %s", err)
outputFormat = h.c.OutputFormat
outputer = h.outputer
}
negotiatedContentType := h.responseContentType(outputFormat)
log.Printf("[TRACE] %v: requesting health probe", r.RemoteAddr)
resp := h.processAndEnsureCached(negotiatedContentType, outputer)
w.Header().Set(http.CanonicalHeaderKey("Content-Type"), negotiatedContentType) //nolint:gosimple
w.WriteHeader(resp.statusCode)
logBody := ""
if resp.statusCode != http.StatusOK {
logBody = " - " + resp.body.String()
}
resp.body.WriteTo(w)
log.Printf("[DEBUG] %v: status %d%s", r.RemoteAddr, resp.statusCode, logBody)
}
func (h healthHandler) processAndEnsureCached(negotiatedContentType string, outputer outputs.Outputer) res {
var tra [][]resource.TestResult
cacheKey := "res"
tmp, found := h.cache.Get(cacheKey)
if found {
log.Printf("[TRACE] Returning cached[%s].", cacheKey)
tra = tmp.([][]resource.TestResult)
} else {
log.Printf("Stale cache[%s], running tests", cacheKey)
h.sys = system.New(h.c.PackageManager)
tra = h.validate()
h.cache.SetDefault(cacheKey, tra)
}
trc := testResultArrayToChan(tra)
return h.output(trc, outputer)
}
func (h healthHandler) output(trc <-chan []resource.TestResult, outputer outputs.Outputer) res {
var b bytes.Buffer
outputConfig := util.OutputConfig{
FormatOptions: h.c.FormatOptions,
}
exitCode := outputer.Output(&b, trc, outputConfig)
resp := res{
body: b,
}
if exitCode == 0 {
resp.statusCode = http.StatusOK
} else {
resp.statusCode = http.StatusServiceUnavailable
}
return resp
}
func (h healthHandler) validate() [][]resource.TestResult {
h.sys = system.New(h.c.PackageManager)
res := make([][]resource.TestResult, 0)
tr := validate(h.sys, h.gossConfig, h.c.DisabledResourceTypes, h.maxConcurrent)
for i := range tr {
res = append(res, i)
}
return res
}
func testResultArrayToChan(tra [][]resource.TestResult) <-chan []resource.TestResult {
c := make(chan []resource.TestResult)
go func(c chan []resource.TestResult) {
defer close(c)
for _, i := range tra {
c <- i
}
}(c)
return c
}
const (
// https://en.wikipedia.org/wiki/Media_type
mediaTypePrefix = "application/vnd.goss-"
)
func (h healthHandler) negotiateResponseContentType(r *http.Request) (string, outputs.Outputer, error) {
acceptHeader := r.Header[http.CanonicalHeaderKey("Accept")]
var outputer outputs.Outputer
outputName := ""
for _, acceptCandidate := range acceptHeader {
acceptCandidate = strings.TrimSpace(acceptCandidate)
if strings.HasPrefix(acceptCandidate, mediaTypePrefix) {
outputName = strings.TrimPrefix(acceptCandidate, mediaTypePrefix)
} else if strings.EqualFold("application/json", acceptCandidate) || strings.EqualFold("text/json", acceptCandidate) {
outputName = "json"
} else {
outputName = ""
}
var err error
outputer, err = outputs.GetOutputer(outputName)
if err != nil {
continue
}
}
if outputer == nil {
return "", nil, fmt.Errorf("Accept header on request missing or invalid. Accept header: %v", acceptHeader)
}
return outputName, outputer, nil
}
func (h healthHandler) responseContentType(outputName string) string {
if outputName == "json" {
return "application/json"
}
return fmt.Sprintf("%s%s", mediaTypePrefix, outputName)
}
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