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processor.go
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processor.go
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package main
import (
"bytes"
"fmt"
"net"
"sync"
"sync/atomic"
"time"
"github.com/blind-oracle/go-common/logger"
"github.com/gogo/protobuf/proto"
"github.com/golang/snappy"
"github.com/google/uuid"
me "github.com/hashicorp/go-multierror"
"github.com/pkg/errors"
"github.com/prometheus/prometheus/prompb"
fh "github.com/valyala/fasthttp"
)
type result struct {
code int
body []byte
err error
}
type processor struct {
cfg config
srv *fh.Server
cli *fh.Client
shuttingDown uint32
logger.Logger
}
func newProcessor(c config) *processor {
p := &processor{
cfg: c,
Logger: logger.NewSimpleLogger("proc"),
}
p.srv = &fh.Server{
Name: "cortex-tenant",
Handler: p.handle,
MaxRequestBodySize: 8 * 1024 * 1024,
ReadTimeout: c.Timeout,
WriteTimeout: c.Timeout,
IdleTimeout: 60 * time.Second,
Concurrency: c.Concurrency,
}
p.cli = &fh.Client{
Name: "cortex-tenant",
ReadTimeout: c.Timeout,
WriteTimeout: c.Timeout,
MaxConnWaitTimeout: 1 * time.Second,
MaxConnsPerHost: 64,
}
// For testing
if c.pipeOut != nil {
p.cli.Dial = func(a string) (net.Conn, error) {
return c.pipeOut.Dial()
}
}
return p
}
func (p *processor) run() (err error) {
var l net.Listener
// For testing
if p.cfg.pipeIn == nil {
if l, err = net.Listen("tcp", p.cfg.Listen); err != nil {
return
}
} else {
l = p.cfg.pipeIn
}
go p.srv.Serve(l)
return
}
func (p *processor) handle(ctx *fh.RequestCtx) {
if bytes.Equal(ctx.Path(), []byte("/alive")) {
if atomic.LoadUint32(&p.shuttingDown) == 1 {
ctx.SetStatusCode(fh.StatusServiceUnavailable)
}
return
}
if !bytes.Equal(ctx.Request.Header.Method(), []byte("POST")) {
ctx.Error("Expecting POST", fh.StatusBadRequest)
return
}
if !bytes.Equal(ctx.Path(), []byte("/push")) {
ctx.SetStatusCode(fh.StatusNotFound)
return
}
wrReqIn, err := p.unmarshal(ctx.Request.Body())
if err != nil {
ctx.Error(err.Error(), fh.StatusBadRequest)
return
}
clientIP := ctx.RemoteAddr()
reqID, _ := uuid.NewRandom()
if len(wrReqIn.Timeseries) == 0 {
// If there's metadata - just accept the request and drop it
if len(wrReqIn.Metadata) > 0 {
if p.cfg.Metadata && p.cfg.Tenant.Default != "" {
code, body, err := p.send(clientIP, reqID, p.cfg.Tenant.Default, wrReqIn)
if err != nil {
ctx.Error(err.Error(), fh.StatusInternalServerError)
p.Errorf("src=%s req_id=%s: unable to proxy metadata: %s", clientIP, reqID, err)
return
}
ctx.SetStatusCode(code)
ctx.SetBody(body)
}
return
}
ctx.Error("No timeseries found in the request", fh.StatusBadRequest)
return
}
m, err := p.createWriteRequests(wrReqIn)
if err != nil {
ctx.Error(err.Error(), fh.StatusBadRequest)
return
}
var errs *me.Error
results := p.dispatch(clientIP, reqID, m)
code, body := 0, []byte("Ok")
// Return 204 regardless of errors if AcceptAll is enabled
if p.cfg.Tenant.AcceptAll {
code, body = 204, nil
goto out
}
for _, r := range results {
if r.err != nil {
errs = me.Append(errs, r.err)
p.Errorf("src=%s %s", clientIP, r.err)
continue
}
if r.code < 200 || r.code >= 300 {
p.Errorf("src=%s req_id=%s HTTP code %d (%s)", clientIP, reqID, r.code, string(r.body))
}
if r.code > code {
code, body = r.code, r.body
}
}
if errs.ErrorOrNil() != nil {
ctx.Error(errs.Error(), fh.StatusInternalServerError)
return
}
out:
// Pass back max status code from upstream response
ctx.SetBody(body)
ctx.SetStatusCode(code)
}
func (p *processor) createWriteRequests(wrReqIn *prompb.WriteRequest) (map[string]*prompb.WriteRequest, error) {
// Create per-tenant write requests
m := map[string]*prompb.WriteRequest{}
for _, ts := range wrReqIn.Timeseries {
tenant, err := p.processTimeseries(&ts)
if err != nil {
return nil, err
}
wrReqOut, ok := m[tenant]
if !ok {
wrReqOut = &prompb.WriteRequest{}
m[tenant] = wrReqOut
}
wrReqOut.Timeseries = append(wrReqOut.Timeseries, ts)
}
return m, nil
}
func (p *processor) unmarshal(b []byte) (*prompb.WriteRequest, error) {
decoded, err := snappy.Decode(nil, b)
if err != nil {
return nil, errors.Wrap(err, "Unable to unpack Snappy")
}
req := &prompb.WriteRequest{}
if err = proto.Unmarshal(decoded, req); err != nil {
return nil, errors.Wrap(err, "Unable to unmarshal protobuf")
}
return req, nil
}
func (p *processor) marshal(wr *prompb.WriteRequest) (bufOut []byte, err error) {
b := make([]byte, wr.Size())
// Marshal to Protobuf
if _, err = wr.MarshalTo(b); err != nil {
return
}
// Compress with Snappy
return snappy.Encode(nil, b), nil
}
func (p *processor) dispatch(clientIP net.Addr, reqID uuid.UUID, m map[string]*prompb.WriteRequest) (res []result) {
var wg sync.WaitGroup
res = make([]result, len(m))
i := 0
for tenant, wrReq := range m {
wg.Add(1)
go func(idx int, tenant string, wrReq *prompb.WriteRequest) {
defer wg.Done()
var r result
r.code, r.body, r.err = p.send(clientIP, reqID, tenant, wrReq)
res[idx] = r
}(i, tenant, wrReq)
i++
}
wg.Wait()
return
}
func (p *processor) processTimeseries(ts *prompb.TimeSeries) (tenant string, err error) {
idx := 0
for i, l := range ts.Labels {
if l.Name == p.cfg.Tenant.Label {
tenant, idx = l.Value, i
break
}
}
if tenant == "" {
if p.cfg.Tenant.Default == "" {
return "", fmt.Errorf("label '%s' not found", p.cfg.Tenant.Label)
}
return p.cfg.Tenant.Default, nil
}
if p.cfg.Tenant.LabelRemove {
l := len(ts.Labels)
ts.Labels[idx] = ts.Labels[l-1]
ts.Labels = ts.Labels[:l-1]
}
return
}
func (p *processor) send(clientIP net.Addr, reqID uuid.UUID, tenant string, wr *prompb.WriteRequest) (code int, body []byte, err error) {
req := fh.AcquireRequest()
resp := fh.AcquireResponse()
defer func() {
fh.ReleaseRequest(req)
fh.ReleaseResponse(resp)
}()
buf, err := p.marshal(wr)
if err != nil {
return
}
req.Header.SetMethod("POST")
req.Header.Set("Content-Encoding", "snappy")
req.Header.Set("Content-Type", "application/x-protobuf")
req.Header.Set("X-Prometheus-Remote-Write-Version", "0.1.0")
req.Header.Set("X-Cortex-Tenant-Client", clientIP.String())
req.Header.Set("X-Cortex-Tenant-ReqID", reqID.String())
req.Header.Set(p.cfg.Tenant.Header, tenant)
req.SetRequestURI(p.cfg.Target)
req.SetBody(buf)
if err = p.cli.DoTimeout(req, resp, p.cfg.Timeout); err != nil {
return
}
code = resp.Header.StatusCode()
body = make([]byte, len(resp.Body()))
copy(body, resp.Body())
return
}
func (p *processor) close() (err error) {
// Signal that we're shutting down
atomic.StoreUint32(&p.shuttingDown, 1)
// Let healthcheck detect that we're offline
time.Sleep(p.cfg.TimeoutShutdown)
// Shutdown
return p.srv.Shutdown()
}