3b3f786d68
This commit adds support for OpenCensus tracing and metrics collection. This required support for context.Context propogation throughout the cluster codebase, and in particular, the ipfscluster component interfaces. The tracing propogates across RPC and HTTP boundaries. The current default tracing backend is Jaeger. The metrics currently exports the metrics exposed by the opencensus http plugin as well as the pprof metrics to a prometheus endpoint for scraping. The current default metrics backend is Prometheus. Metrics are currently exposed by default due to low overhead, can be turned off if desired, whereas tracing is off by default as it has a much higher performance overhead, though the extent of the performance hit can be adjusted with smaller sampling rates. License: MIT Signed-off-by: Adrian Lanzafame <adrianlanzafame92@gmail.com>
165 lines
3.3 KiB
Go
165 lines
3.3 KiB
Go
package client
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import (
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"context"
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"encoding/json"
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"io"
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"io/ioutil"
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"net/http"
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"strings"
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"go.opencensus.io/trace"
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"github.com/ipfs/ipfs-cluster/api"
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)
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type responseDecoder func(d *json.Decoder) error
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func (c *defaultClient) do(
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ctx context.Context,
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method, path string,
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headers map[string]string,
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body io.Reader,
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obj interface{},
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) error {
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resp, err := c.doRequest(ctx, method, path, headers, body)
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if err != nil {
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return &api.Error{Code: 0, Message: err.Error()}
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}
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return c.handleResponse(resp, obj)
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}
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func (c *defaultClient) doStream(
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ctx context.Context,
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method, path string,
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headers map[string]string,
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body io.Reader,
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outHandler responseDecoder,
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) error {
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resp, err := c.doRequest(ctx, method, path, headers, body)
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if err != nil {
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return &api.Error{Code: 0, Message: err.Error()}
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}
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return c.handleStreamResponse(resp, outHandler)
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}
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func (c *defaultClient) doRequest(
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ctx context.Context,
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method, path string,
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headers map[string]string,
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body io.Reader,
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) (*http.Response, error) {
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span := trace.FromContext(ctx)
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span.AddAttributes(
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trace.StringAttribute("method", method),
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trace.StringAttribute("path", path),
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)
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defer span.End()
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urlpath := c.net + "://" + c.hostname + "/" + strings.TrimPrefix(path, "/")
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logger.Debugf("%s: %s", method, urlpath)
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r, err := http.NewRequest(method, urlpath, body)
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if err != nil {
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return nil, err
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}
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if c.config.DisableKeepAlives {
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r.Close = true
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}
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if c.config.Username != "" {
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r.SetBasicAuth(c.config.Username, c.config.Password)
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}
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if headers != nil {
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for k, v := range headers {
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r.Header.Set(k, v)
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}
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}
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if body != nil {
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r.ContentLength = -1 // this lets go use "chunked".
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}
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ctx = trace.NewContext(ctx, span)
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r = r.WithContext(ctx)
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return c.client.Do(r)
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}
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func (c *defaultClient) handleResponse(resp *http.Response, obj interface{}) error {
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body, err := ioutil.ReadAll(resp.Body)
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resp.Body.Close()
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if err != nil {
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return &api.Error{Code: resp.StatusCode, Message: err.Error()}
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}
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logger.Debugf("Response body: %s", body)
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switch {
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case resp.StatusCode == http.StatusAccepted:
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logger.Debug("Request accepted")
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case resp.StatusCode == http.StatusNoContent:
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logger.Debug("Request suceeded. Response has no content")
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default:
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if resp.StatusCode > 399 && resp.StatusCode < 600 {
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var apiErr api.Error
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err = json.Unmarshal(body, &apiErr)
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if err != nil {
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// not json. 404s etc.
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return &api.Error{
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Code: resp.StatusCode,
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Message: string(body),
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}
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}
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return &apiErr
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}
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err = json.Unmarshal(body, obj)
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if err != nil {
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return &api.Error{
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Code: resp.StatusCode,
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Message: err.Error(),
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}
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}
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}
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return nil
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}
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func (c *defaultClient) handleStreamResponse(resp *http.Response, handler responseDecoder) error {
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if resp.StatusCode > 399 && resp.StatusCode < 600 {
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return c.handleResponse(resp, nil)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return &api.Error{
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Code: resp.StatusCode,
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Message: "expected streaming response with code 200",
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}
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}
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dec := json.NewDecoder(resp.Body)
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for {
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err := handler(dec)
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if err == io.EOF {
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// we need to check trailers
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break
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}
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if err != nil {
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logger.Error(err)
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return err
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}
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}
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errTrailer := resp.Trailer.Get("X-Stream-Error")
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if errTrailer != "" {
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return &api.Error{
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Code: 500,
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Message: errTrailer,
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}
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}
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return nil
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}
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