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prevent transient zrepl status error: Post "http://unix/status": EOF

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See the comment added to client.go in this commit.

fixes https://github.com/zrepl/zrepl/issues/483
fixes https://github.com/zrepl/zrepl/issues/262
fixes https://github.com/zrepl/zrepl/issues/379
fixes https://github.com/zrepl/zrepl/issues/379
This commit is contained in:
Christian Schwarz 2022-06-26 14:19:54 +02:00
parent 2642c64303
commit e0c7ceedd5
2 changed files with 18 additions and 6 deletions
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22
client/status/client/client.go
View File

@ -14,11 +14,11 @@ import (
)
type Client struct {
h http.Client
h *http.Client
}
func New(network, addr string) (*Client, error) {
httpc, err := controlHttpClient(func(_ context.Context) (net.Conn, error) { return net.Dial(network, addr) })
httpc, err := makeControlHttpClient(func(_ context.Context) (net.Conn, error) { return net.Dial(network, addr) })
if err != nil {
return nil, err
}
@ -63,8 +63,8 @@ func (c *Client) SignalReset(job string) error {
return c.signal(job, "reset")
}
func controlHttpClient(dialfunc func(context.Context) (net.Conn, error)) (client http.Client, err error) {
return http.Client{
func makeControlHttpClient(dialfunc func(context.Context) (net.Conn, error)) (client *http.Client, err error) {
return &http.Client{
Transport: &http.Transport{
DialContext: func(ctx context.Context, _, _ string) (net.Conn, error) {
return dialfunc(ctx)
@ -73,14 +73,24 @@ func controlHttpClient(dialfunc func(context.Context) (net.Conn, error)) (client
}, nil
}
func jsonRequestResponse(c http.Client, endpoint string, req interface{}, res interface{}) error {
func jsonRequestResponse(c *http.Client, endpoint string, req interface{}, res interface{}) error {
var buf bytes.Buffer
encodeErr := json.NewEncoder(&buf).Encode(req)
if encodeErr != nil {
return encodeErr
}
resp, err := c.Post("http://unix"+endpoint, "application/json", &buf)
hreq, err := http.NewRequest("POST", "http://unix"+endpoint, &buf)
if err != nil {
return err
}
hreq.Header.Set("Content-Type", "application/json")
// Prevent EOF errors when client request frequency and server keepalive close are at the same time.
// Found this by watching http.Server.ConnState changes, then found
// https://stackoverflow.com/questions/17714494/golang-http-request-results-in-eof-errors-when-making-multiple-requests-successi
// Note: The issue seems even more prounounced with local TCP sockets than unix domain sockets. So, I used that for debugging.
hreq.Close = true
resp, err := c.Do(hreq)
if err != nil {
return err
}

2
docs/changelog.rst
View File

@ -27,6 +27,8 @@ Developers should consult the git commit log or GitHub issue tracker.
But the metric *value* is now the Unix timestamp at the time the daemon was started.
The Grafana dashboard in :repomasterlink:`dist/grafana` has been updated.
* |bugfix| transient zrepl status error: ``Post "http://unix/status": EOF``
0.5
---