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package handler
import (
"net"
"net/http"
"strconv"
"strings"
"sync"
"time"
"github.com/spiral/errors"
"github.com/spiral/roadrunner/v2/pkg/events"
"github.com/spiral/roadrunner/v2/pkg/pool"
"github.com/spiral/roadrunner/v2/plugins/http/config"
"github.com/spiral/roadrunner/v2/plugins/logger"
)
// MB is 1024 bytes
const MB uint64 = 1024 * 1024
// ErrorEvent represents singular http error event.
type ErrorEvent struct {
// Request contains client request, must not be stored.
Request *http.Request
// Error - associated error, if any.
Error error
// event timings
start time.Time
elapsed time.Duration
}
// Elapsed returns duration of the invocation.
func (e *ErrorEvent) Elapsed() time.Duration {
return e.elapsed
}
// ResponseEvent represents singular http response event.
type ResponseEvent struct {
// Request contains client request, must not be stored.
Request *Request
// Response contains service response.
Response *Response
// event timings
start time.Time
elapsed time.Duration
}
// Elapsed returns duration of the invocation.
func (e *ResponseEvent) Elapsed() time.Duration {
return e.elapsed
}
// Handler serves http connections to underlying PHP application using PSR-7 protocol. Context will include request headers,
// parsed files and query, payload will include parsed form dataTree (if any).
type Handler struct {
maxRequestSize uint64
uploads config.Uploads
trusted config.Cidrs
log logger.Logger
pool pool.Pool
mul sync.Mutex
lsn []events.Listener
internalHTTPCode uint64
}
// NewHandler return handle interface implementation
func NewHandler(maxReqSize uint64, internalHTTPCode uint64, uploads config.Uploads, trusted config.Cidrs, pool pool.Pool) (*Handler, error) {
if pool == nil {
return nil, errors.E(errors.Str("pool should be initialized"))
}
return &Handler{
maxRequestSize: maxReqSize * MB,
uploads: uploads,
pool: pool,
trusted: trusted,
internalHTTPCode: internalHTTPCode,
}, nil
}
// AddListener attaches handler event controller.
func (h *Handler) AddListener(l ...events.Listener) {
h.mul.Lock()
defer h.mul.Unlock()
h.lsn = l
}
// mdwr serve using PSR-7 requests passed to underlying application. Attempts to serve static files first if enabled.
func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
const op = errors.Op("serve_http")
start := time.Now()
// validating request size
if h.maxRequestSize != 0 {
const op = errors.Op("http_handler_max_size")
if length := r.Header.Get("content-length"); length != "" {
// try to parse the value from the `content-length` header
size, err := strconv.ParseInt(length, 10, 64)
if err != nil {
// if got an error while parsing -> assign 500 code to the writer and return
http.Error(w, "", 500)
h.sendEvent(ErrorEvent{Request: r, Error: errors.E(op, errors.Str("error while parsing value from the `content-length` header")), start: start, elapsed: time.Since(start)})
return
}
if size > int64(h.maxRequestSize) {
h.sendEvent(ErrorEvent{Request: r, Error: errors.E(op, errors.Str("request body max size is exceeded")), start: start, elapsed: time.Since(start)})
http.Error(w, errors.E(op, errors.Str("request body max size is exceeded")).Error(), http.StatusBadRequest)
return
}
}
}
req, err := NewRequest(r, h.uploads)
if err != nil {
// if pipe is broken, there is no sense to write the header
// in this case we just report about error
if err == errEPIPE {
h.sendEvent(ErrorEvent{Request: r, Error: err, start: start, elapsed: time.Since(start)})
return
}
http.Error(w, errors.E(op, err).Error(), 500)
h.sendEvent(ErrorEvent{Request: r, Error: errors.E(op, err), start: start, elapsed: time.Since(start)})
return
}
// proxy IP resolution
h.resolveIP(req)
req.Open(h.log)
defer req.Close(h.log)
p, err := req.Payload()
if err != nil {
h.handleError(w, r, start, err)
h.sendEvent(ErrorEvent{Request: r, Error: errors.E(op, err), start: start, elapsed: time.Since(start)})
return
}
rsp, err := h.pool.Exec(p)
if err != nil {
h.handleError(w, r, start, err)
h.sendEvent(ErrorEvent{Request: r, Error: errors.E(op, err), start: start, elapsed: time.Since(start)})
return
}
resp, err := NewResponse(rsp)
if err != nil {
h.handleError(w, r, start, err)
h.sendEvent(ErrorEvent{Request: r, Error: errors.E(op, err), start: start, elapsed: time.Since(start)})
return
}
h.handleResponse(req, resp, start)
err = resp.Write(w)
if err != nil {
http.Error(w, errors.E(op, err).Error(), 500)
h.sendEvent(ErrorEvent{Request: r, Error: errors.E(op, err), start: start, elapsed: time.Since(start)})
}
}
// handleError will handle internal RR errors and return 500
func (h *Handler) handleError(w http.ResponseWriter, r *http.Request, start time.Time, err error) {
const op = errors.Op("handle_error")
// internal error types, user should not see them
if errors.Is(errors.SoftJob, err) ||
errors.Is(errors.WatcherStopped, err) ||
errors.Is(errors.WorkerAllocate, err) ||
errors.Is(errors.NoFreeWorkers, err) ||
errors.Is(errors.ExecTTL, err) ||
errors.Is(errors.IdleTTL, err) ||
errors.Is(errors.TTL, err) ||
errors.Is(errors.Encode, err) ||
errors.Is(errors.Decode, err) ||
errors.Is(errors.Network, err) {
// write an internal server error
w.WriteHeader(int(h.internalHTTPCode))
h.sendEvent(ErrorEvent{Request: r, Error: errors.E(op, err), start: start, elapsed: time.Since(start)})
}
}
// handleResponse triggers response event.
func (h *Handler) handleResponse(req *Request, resp *Response, start time.Time) {
h.sendEvent(ResponseEvent{Request: req, Response: resp, start: start, elapsed: time.Since(start)})
}
// sendEvent invokes event handler if any.
func (h *Handler) sendEvent(event interface{}) {
if h.lsn != nil {
for _, l := range h.lsn {
l(event)
}
}
}
// get real ip passing multiple proxy
func (h *Handler) resolveIP(r *Request) {
if h.trusted.IsTrusted(r.RemoteAddr) == false { //nolint:gosimple
return
}
if r.Header.Get("X-Forwarded-For") != "" {
ips := strings.Split(r.Header.Get("X-Forwarded-For"), ",")
ipCount := len(ips)
for i := ipCount - 1; i >= 0; i-- {
addr := strings.TrimSpace(ips[i])
if net.ParseIP(addr) != nil {
r.RemoteAddr = addr
return
}
}
return
}
// The logic here is the following:
// In general case, we only expect X-Real-Ip header. If it exist, we get the IP address from header and set request Remote address
// But, if there is no X-Real-Ip header, we also trying to check CloudFlare headers
// True-Client-IP is a general CF header in which copied information from X-Real-Ip in CF.
// CF-Connecting-IP is an Enterprise feature and we check it last in order.
// This operations are near O(1) because Headers struct are the map type -> type MIMEHeader map[string][]string
if r.Header.Get("X-Real-Ip") != "" {
r.RemoteAddr = FetchIP(r.Header.Get("X-Real-Ip"))
return
}
if r.Header.Get("True-Client-IP") != "" {
r.RemoteAddr = FetchIP(r.Header.Get("True-Client-IP"))
return
}
if r.Header.Get("CF-Connecting-IP") != "" {
r.RemoteAddr = FetchIP(r.Header.Get("CF-Connecting-IP"))
}
}
|
