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data_adapter.go
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/
data_adapter.go
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package backend
import (
"context"
"net/http"
"github.com/kosimas/grafana-plugin-sdk-go/backend/httpclient"
"github.com/kosimas/grafana-plugin-sdk-go/genproto/pluginv2"
)
// dataSDKAdapter adapter between low level plugin protocol and SDK interfaces.
type dataSDKAdapter struct {
queryDataHandler QueryDataHandler
}
func newDataSDKAdapter(handler QueryDataHandler) *dataSDKAdapter {
return &dataSDKAdapter{
queryDataHandler: handler,
}
}
func withHeaderMiddleware(ctx context.Context, headers http.Header) context.Context {
if len(headers) > 0 {
ctx = httpclient.WithContextualMiddleware(ctx,
httpclient.MiddlewareFunc(func(opts httpclient.Options, next http.RoundTripper) http.RoundTripper {
if !opts.ForwardHTTPHeaders {
return next
}
return httpclient.RoundTripperFunc(func(qreq *http.Request) (*http.Response, error) {
// Only set a header if it is not already set.
for k, v := range headers {
if qreq.Header.Get(k) == "" {
for _, vv := range v {
qreq.Header.Add(k, vv)
}
}
}
return next.RoundTrip(qreq)
})
}))
}
return ctx
}
func (a *dataSDKAdapter) QueryData(ctx context.Context, req *pluginv2.QueryDataRequest) (*pluginv2.QueryDataResponse, error) {
ctx = propagateTenantIDIfPresent(ctx)
parsedRequest := FromProto().QueryDataRequest(req)
ctx = withHeaderMiddleware(ctx, parsedRequest.GetHTTPHeaders())
resp, err := a.queryDataHandler.QueryData(ctx, parsedRequest)
if err != nil {
return nil, err
}
return ToProto().QueryDataResponse(resp)
}