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https://github.com/grafana/grafana.git
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3fb6319d1b
* Move files to prometheus-library * refactor core prometheus to use prometheus-library * modify client transport options * mock * have a type * import aliases * rename * call the right method * remove unrelated test from the library * update codeowners * go work sync * update go.work.sum * make swagger-clean && make openapi3-gen * add promlib to makefile * remove clilogger * Export the function * update unit test * add prometheus_test.go * fix mock type * use mapUtil from grafana-plugin-sdk-go
31 lines
1.0 KiB
Go
31 lines
1.0 KiB
Go
package middleware
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import (
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"net/http"
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sdkhttpclient "github.com/grafana/grafana-plugin-sdk-go/backend/httpclient"
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"github.com/grafana/grafana-plugin-sdk-go/backend/log"
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)
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func ForceHttpGet(logger log.Logger) sdkhttpclient.Middleware {
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return sdkhttpclient.NamedMiddlewareFunc("force-http-get", func(opts sdkhttpclient.Options, next http.RoundTripper) http.RoundTripper {
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// the prometheus library we use does not allow us to set the http method.
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// it's behavior is to first try POST, and if it fails in certain ways
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// (for example, by returning a method-not-allowed error), it will try GET.
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// so here, we check if the http-method is POST, and if it is, we
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// return an artificial method-not-allowed response.
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// this will cause the prometheus library to retry with GET.
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return sdkhttpclient.RoundTripperFunc(func(req *http.Request) (*http.Response, error) {
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if req.Method == http.MethodPost {
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resp := &http.Response{
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StatusCode: http.StatusMethodNotAllowed,
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}
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return resp, nil
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}
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return next.RoundTrip(req)
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})
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})
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}
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