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// Copyright (c) 2023 Canonical Ltd | ||
// | ||
// This program is free software: you can redistribute it and/or modify | ||
// it under the terms of the GNU General Public License version 3 as | ||
// published by the Free Software Foundation. | ||
// | ||
// This program is distributed in the hope that it will be useful, | ||
// but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
// GNU General Public License for more details. | ||
// | ||
// You should have received a copy of the GNU General Public License | ||
// along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
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/* | ||
Package clienterr contains common error types which are recognised by the log | ||
gatherer. logstate.logClient implementations should return these error types | ||
to communicate with the gatherer. | ||
Errors in this package should be pattern-matched using errors.As: | ||
err := client.Flush(ctx) | ||
backoff := &clienterr.Backoff{} | ||
if errors.As(err, &backoff) { | ||
... | ||
} | ||
*/ | ||
package clienterr | ||
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import ( | ||
"bytes" | ||
"fmt" | ||
"io" | ||
"net/http" | ||
"time" | ||
) | ||
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// Backoff should be returned if the server indicates we are sending too many | ||
// requests (e.g. an HTTP 429 response). | ||
type Backoff struct { | ||
RetryAfter *time.Time | ||
} | ||
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func (e *Backoff) Error() string { | ||
errStr := "too many requests" | ||
if e.RetryAfter != nil { | ||
errStr += ", retry after " + e.RetryAfter.String() | ||
} | ||
return errStr | ||
} | ||
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// ErrorResponse represents an HTTP error response from the server | ||
// (4xx or 5xx). | ||
type ErrorResponse struct { | ||
StatusCode int | ||
Body bytes.Buffer | ||
ReadErr error | ||
} | ||
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func (e *ErrorResponse) Error() string { | ||
errStr := fmt.Sprintf("server returned HTTP %d\n", e.StatusCode) | ||
if e.Body.Len() > 0 { | ||
errStr += fmt.Sprintf(`response body: | ||
%s | ||
`, e.Body.String()) | ||
} | ||
if e.ReadErr != nil { | ||
errStr += "cannot read response body: " + e.ReadErr.Error() | ||
} | ||
return errStr | ||
} | ||
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// ErrorFromResponse generates a *ErrorResponse from a failed *http.Response. | ||
// NB: this function reads the response body. | ||
func ErrorFromResponse(resp *http.Response) *ErrorResponse { | ||
err := &ErrorResponse{} | ||
err.StatusCode = resp.StatusCode | ||
_, readErr := io.CopyN(&err.Body, resp.Body, 1024) | ||
err.ReadErr = readErr | ||
return err | ||
} |
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Original file line number | Diff line number | Diff line change |
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// Copyright (c) 2023 Canonical Ltd | ||
// | ||
// This program is free software: you can redistribute it and/or modify | ||
// it under the terms of the GNU General Public License version 3 as | ||
// published by the Free Software Foundation. | ||
// | ||
// This program is distributed in the hope that it will be useful, | ||
// but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
// GNU General Public License for more details. | ||
// | ||
// You should have received a copy of the GNU General Public License | ||
// along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
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package loki | ||
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import "time" | ||
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func SetRequestTimeout(new time.Duration) (restore func()) { | ||
oldRequestTimeout := requestTimeout | ||
requestTimeout = new | ||
return func() { | ||
requestTimeout = oldRequestTimeout | ||
} | ||
} |
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