127 lines
3.2 KiB
Go
127 lines
3.2 KiB
Go
/*
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Copyright 2016 The Fission Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package client
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import (
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"bytes"
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"context"
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"encoding/json"
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"io/ioutil"
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"net/http"
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"net/url"
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"strings"
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"time"
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"github.com/pkg/errors"
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"go.opencensus.io/plugin/ochttp"
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"go.uber.org/zap"
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"golang.org/x/net/context/ctxhttp"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"github.com/fission/fission"
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)
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type Client struct {
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logger *zap.Logger
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executorUrl string
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tappedByUrl map[string]bool
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requestChan chan string
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httpClient *http.Client
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}
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func MakeClient(logger *zap.Logger, executorUrl string) *Client {
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c := &Client{
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logger: logger.Named("executor_client"),
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executorUrl: strings.TrimSuffix(executorUrl, "/"),
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tappedByUrl: make(map[string]bool),
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requestChan: make(chan string),
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httpClient: &http.Client{
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Transport: &ochttp.Transport{},
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},
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}
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go c.service()
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return c
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}
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func (c *Client) GetServiceForFunction(ctx context.Context, metadata *metav1.ObjectMeta) (string, error) {
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executorUrl := c.executorUrl + "/v2/getServiceForFunction"
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body, err := json.Marshal(metadata)
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if err != nil {
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return "", errors.Wrap(err, "could not marshal request body for getting service for function")
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}
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resp, err := ctxhttp.Post(ctx, c.httpClient, executorUrl, "application/json", bytes.NewReader(body))
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if err != nil {
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return "", errors.Wrap(err, "error posting to getting service for function")
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}
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defer resp.Body.Close()
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if resp.StatusCode != 200 {
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return "", fission.MakeErrorFromHTTP(resp)
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}
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svcName, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return "", errors.Wrap(err, "error reading response body from getting service for function")
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}
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return string(svcName), nil
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}
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func (c *Client) service() {
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ticker := time.NewTicker(time.Second * 5)
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for {
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select {
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case serviceUrl := <-c.requestChan:
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c.tappedByUrl[serviceUrl] = true
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case <-ticker.C:
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urls := c.tappedByUrl
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c.tappedByUrl = make(map[string]bool)
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if len(urls) > 0 {
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go func() {
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for u := range urls {
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err := c._tapService(u)
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if err != nil {
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c.logger.Error("error tapping function service address", zap.Error(err), zap.String("address", u))
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}
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}
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c.logger.Info("tapped services in batch", zap.Int("service_count", len(urls)))
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}()
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}
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}
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}
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}
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func (c *Client) TapService(serviceUrl *url.URL) {
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c.requestChan <- serviceUrl.String()
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}
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func (c *Client) _tapService(serviceUrlStr string) error {
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executorUrl := c.executorUrl + "/v2/tapService"
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resp, err := http.Post(executorUrl, "application/octet-stream", bytes.NewReader([]byte(serviceUrlStr)))
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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if resp.StatusCode != 200 {
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return fission.MakeErrorFromHTTP(resp)
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}
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return nil
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}
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