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http_post.go
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http_post.go
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package kapacitor
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"strconv"
"sync"
"time"
"bytes"
"context"
"github.com/influxdata/kapacitor/edge"
"github.com/influxdata/kapacitor/keyvalue"
"github.com/influxdata/kapacitor/models"
"github.com/influxdata/kapacitor/pipeline"
"github.com/influxdata/kapacitor/services/httppost"
"github.com/pkg/errors"
)
type HTTPPostNode struct {
node
c *pipeline.HTTPPostNode
endpoint *httppost.Endpoint
mu sync.RWMutex
timeout time.Duration
hc *http.Client
}
// Create a new HTTPPostNode which submits received items via POST to an HTTP endpoint
func newHTTPPostNode(et *ExecutingTask, n *pipeline.HTTPPostNode, d NodeDiagnostic) (*HTTPPostNode, error) {
hn := &HTTPPostNode{
node: node{Node: n, et: et, diag: d},
c: n,
timeout: n.Timeout,
}
// Should only ever be 0 or 1 from validation of n
if len(n.URLs) == 1 {
temp, err := httppost.GetTemplate(n.URLs[0], "")
if err != nil {
return nil, errors.Wrap(err, "error in url templating")
}
e := httppost.NewEndpoint(temp, nil, httppost.BasicAuth{}, nil, nil)
hn.endpoint = e
}
// Should only ever be 0 or 1 from validation of n
if len(n.Endpoints) == 1 {
endpointName := n.Endpoints[0]
e, ok := et.tm.HTTPPostService.Endpoint(endpointName)
if !ok {
return nil, fmt.Errorf("endpoint '%s' does not exist", endpointName)
}
hn.endpoint = e
}
hn.node.runF = hn.runPost
return hn, nil
}
func (n *HTTPPostNode) runPost([]byte) error {
consumer := edge.NewGroupedConsumer(
n.ins[0],
n,
)
n.statMap.Set(statCardinalityGauge, consumer.CardinalityVar())
return consumer.Consume()
}
func (n *HTTPPostNode) NewGroup(group edge.GroupInfo, first edge.PointMeta) (edge.Receiver, error) {
g := &httpPostGroup{
n: n,
buffer: new(edge.BatchBuffer),
}
return edge.NewReceiverFromForwardReceiverWithStats(
n.outs,
edge.NewTimedForwardReceiver(n.timer, g),
), nil
}
type httpPostGroup struct {
n *HTTPPostNode
buffer *edge.BatchBuffer
}
func (g *httpPostGroup) BeginBatch(begin edge.BeginBatchMessage) (edge.Message, error) {
return nil, g.buffer.BeginBatch(begin)
}
func (g *httpPostGroup) BatchPoint(bp edge.BatchPointMessage) (edge.Message, error) {
return nil, g.buffer.BatchPoint(bp)
}
func (g *httpPostGroup) EndBatch(end edge.EndBatchMessage) (edge.Message, error) {
return g.BufferedBatch(g.buffer.BufferedBatchMessage(end))
}
func (g *httpPostGroup) BufferedBatch(batch edge.BufferedBatchMessage) (edge.Message, error) {
row := batch.ToRow()
code := g.n.doPost(row)
if g.n.c.CodeField != "" {
//Add code to all points
batch = batch.ShallowCopy()
points := make([]edge.BatchPointMessage, len(batch.Points()))
for i, bp := range batch.Points() {
fields := bp.Fields().Copy()
fields[g.n.c.CodeField] = int64(code)
points[i] = edge.NewBatchPointMessage(
fields,
bp.Tags(),
bp.Time(),
)
}
batch.SetPoints(points)
}
return batch, nil
}
func (g *httpPostGroup) Point(p edge.PointMessage) (edge.Message, error) {
row := p.ToRow()
code := g.n.doPost(row)
if g.n.c.CodeField != "" {
//Add code to point
p = p.ShallowCopy()
fields := p.Fields().Copy()
fields[g.n.c.CodeField] = int64(code)
p.SetFields(fields)
}
return p, nil
}
func (g *httpPostGroup) Barrier(b edge.BarrierMessage) (edge.Message, error) {
return b, nil
}
func (g *httpPostGroup) DeleteGroup(d edge.DeleteGroupMessage) (edge.Message, error) {
return d, nil
}
func (g *httpPostGroup) Done() {}
func (n *HTTPPostNode) doPost(row *models.Row) int {
resp, err := n.postRow(row)
if err != nil {
n.diag.Error("failed to POST data", err)
return 0
}
defer resp.Body.Close()
if resp.StatusCode/100 != 2 {
var err error
if n.c.CaptureResponseFlag {
var body []byte
body, err = ioutil.ReadAll(resp.Body)
if err == nil {
// Use the body content as the error
err = errors.New(string(body))
}
} else {
err = errors.New("unknown error, use .captureResponse() to capture the HTTP response")
}
n.diag.Error("POST returned non 2xx status code", err, keyvalue.KV("code", strconv.Itoa(resp.StatusCode)))
}
return resp.StatusCode
}
func (n *HTTPPostNode) postRow(row *models.Row) (*http.Response, error) {
body := new(bytes.Buffer)
var contentType string
var mr *mappedRow
if n.endpoint.RowTemplate() != nil || n.endpoint.URL() != nil {
mr = newMappedRow(row)
}
if n.endpoint.RowTemplate() != nil {
err := n.endpoint.RowTemplate().Execute(body, mr)
if err != nil {
return nil, errors.Wrap(err, "failed to execute template")
}
} else {
result := new(models.Result)
result.Series = []*models.Row{row}
err := json.NewEncoder(body).Encode(result)
if err != nil {
return nil, errors.Wrap(err, "failed to marshal row data json")
}
contentType = "application/json"
}
req, err := n.endpoint.NewHTTPRequest(body, mr)
if err != nil {
return nil, errors.Wrap(err, "failed to marshal row data json")
}
// Set content type and other headers
if contentType != "" {
req.Header.Set("Content-Type", contentType)
}
for k, v := range n.c.Headers {
req.Header.Set(k, v)
}
// Set timeout
if n.timeout > 0 {
ctx, cancel := context.WithTimeout(req.Context(), n.timeout)
defer cancel()
req = req.WithContext(ctx)
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
return resp, nil
}
type mappedRow struct {
Name string
Tags map[string]string
Values []map[string]interface{}
}
func newMappedRow(row *models.Row) *mappedRow {
values := make([]map[string]interface{}, len(row.Values))
for i, v := range row.Values {
values[i] = make(map[string]interface{}, len(row.Columns))
for c, col := range row.Columns {
values[i][col] = v[c]
}
}
return &mappedRow{
Name: row.Name,
Tags: row.Tags,
Values: values,
}
}