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handler.go
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/
handler.go
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package httpapp
import (
"context"
"fmt"
"io"
"net/http"
"strings"
"time"
"github.com/go-playground/validator/v10"
"github.com/goccy/go-json"
"github.com/hashicorp/go-retryablehttp"
"github.com/nats-io/nats.go/jetstream"
"github.com/rs/zerolog"
"github.com/hiphops-io/hops/nats"
"github.com/hiphops-io/hops/worker"
)
type (
DoInput struct {
JSON interface{} `json:"json"`
Method string `json:"method" validate:"required,oneof=GET HEAD POST PUT DELETE OPTIONS PATCH"`
Params map[string]string `json:"params"`
Data []byte `json:"data"`
Retries int `json:"retries" validate:"gte=0,lte=3"`
Headers map[string]string `json:"headers"`
URL string `json:"url" validate:"required,http_url"`
}
doJob struct {
msg jetstream.Msg
startedAt time.Time
responseSubject string
}
HTTPHandler struct {
logger zerolog.Logger
natsClient *nats.Client
doJobCh chan doJob
}
)
// NewDoInput creates a DoInput object from a json object given as bytes
func NewDoInput(data []byte) (*DoInput, error) {
doInput := &DoInput{}
// Unmarshal the payload
err := json.Unmarshal(data, &doInput)
if err != nil {
return doInput, fmt.Errorf("Unable to parse input: %w", err)
}
if doInput.Method == "" {
doInput.Method = "GET"
}
doInput.Method = strings.ToUpper(doInput.Method)
// Run field validation
valid := validator.New()
err = valid.Struct(doInput)
if err != nil {
return doInput, fmt.Errorf("Invalid input: %w", err)
}
return doInput, nil
}
func (d *DoInput) HTTPRequest() (*retryablehttp.Request, error) {
var body interface{}
switch {
case d.JSON != nil:
jsonBody, err := json.Marshal(d.JSON)
if err != nil {
return nil, fmt.Errorf("Invalid JSON payload: %w", err)
}
body = jsonBody
case d.Data != nil:
body = []byte(d.Data)
default:
body = nil
}
request, err := retryablehttp.NewRequest(d.Method, d.URL, body)
if err != nil {
return nil, fmt.Errorf("Preparing request failed: %w", err)
}
q := request.URL.Query()
for k, v := range d.Params {
q.Add(k, v)
}
request.URL.RawQuery = q.Encode()
for k, v := range d.Headers {
request.Header.Add(k, v)
}
return request, nil
}
func NewHTTPHandler(ctx context.Context, natsClient *nats.Client, logger zerolog.Logger) (*HTTPHandler, error) {
h := &HTTPHandler{
natsClient: natsClient,
logger: logger,
doJobCh: make(chan doJob, 100),
}
go h.doWorker(ctx, h.doJobCh)
return h, nil
}
func (h *HTTPHandler) AppName() string {
return "http"
}
func (h *HTTPHandler) Do(ctx context.Context, msg jetstream.Msg) error {
startedAt := time.Now()
parsedMsg, err := nats.Parse(msg)
if err != nil {
return fmt.Errorf("Unable to parse response subject from message %s", msg.Subject())
}
job := doJob{
msg: msg,
startedAt: startedAt,
responseSubject: parsedMsg.ResponseSubject(),
}
h.doJobCh <- job
return nil
}
func (h *HTTPHandler) Handlers() map[string]worker.Handler {
handlers := map[string]worker.Handler{}
handlers["do"] = h.Do
return handlers
}
func (h *HTTPHandler) doWorker(ctx context.Context, jobs chan doJob) {
for do := range jobs {
var result interface{}
resultMsg, err := h.handleDoJob(do)
if resultMsg != nil {
result = *resultMsg
}
err, _ = h.natsClient.PublishResult(ctx, do.startedAt, result, err, do.responseSubject)
if err != nil {
h.logger.Error().Err(err).Msgf("Unable to publish result to: %s", do.responseSubject)
}
}
}
func (h *HTTPHandler) handleDoJob(do doJob) (*nats.ResultMsg, error) {
startedAt := do.startedAt
msg := do.msg
doInput, err := NewDoInput(msg.Data())
if err != nil {
return nil, err
}
request, err := doInput.HTTPRequest()
if err != nil {
return nil, err
}
httpC := httpClient(doInput.Retries)
resp, err := httpC.Do(request)
if resp != nil {
defer resp.Body.Close()
}
if err != nil {
return nil, fmt.Errorf("Request failed: %w", err)
}
return createResult(startedAt, resp)
}
func createResult(startedAt time.Time, response *http.Response) (*nats.ResultMsg, error) {
resultMsg := nats.NewResultMsg(startedAt, nil, nil)
responseBody, err := io.ReadAll(response.Body)
if err != nil {
return nil, fmt.Errorf("Unable to read response: %w", err)
}
var jsonData interface{}
if isJsonContent(response) {
err := json.Unmarshal(responseBody, &jsonData)
if err != nil {
jsonData = nil
}
}
headers := map[string]string{}
for k, v := range response.Header {
headers[k] = strings.Join(v, ", ")
}
resultMsg.Headers = headers
resultMsg.Body = string(responseBody)
resultMsg.JSON = jsonData
resultMsg.StatusCode = response.StatusCode
resultMsg.URL = response.Request.URL.String()
return &resultMsg, nil
}
// httpClient creates a new retryable http client with default config
func httpClient(retries int) *retryablehttp.Client {
httpC := retryablehttp.NewClient()
httpC.RetryMax = retries
httpC.HTTPClient.Timeout = time.Second * 10
httpC.Logger = nil
return httpC
}
func isJsonContent(response *http.Response) bool {
contentType := response.Header.Get("Content-Type")
if contentType == "" {
return false
}
mediaType := strings.TrimSpace(strings.Split(contentType, ";")[0])
if strings.ToLower(mediaType) == "application/json" {
return true
}
return false
}