67 lines
1.5 KiB
Go
67 lines
1.5 KiB
Go
package resolver
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import (
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"context"
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"io"
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"time"
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"github.com/FAU-CDI/wisski-distillery/pkg/logging"
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"github.com/FAU-CDI/wisski-distillery/pkg/timex"
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)
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// updatePrefixes starts updating prefixes
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func (resolver *Resolver) updatePrefixes(ctx context.Context, progress io.Writer) {
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go func() {
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for t := range timex.TickContext(ctx, resolver.RefreshInterval) {
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logging.ProgressF(progress, ctx, "[%s]: reloading prefixes\n", t.Format(time.Stamp))
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err := (func() (err error) {
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ctx, cancel := context.WithTimeout(ctx, resolver.RefreshInterval)
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defer cancel()
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prefixes, err := resolver.AllPrefixes(ctx)
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if err != nil {
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return err
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}
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resolver.prefixes.Set(prefixes)
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return nil
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})()
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if err != nil {
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logging.ProgressF(progress, ctx, "error reloading prefixes: %s", err.Error())
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}
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}
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}()
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}
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// AllPrefixes returns a list of all prefixes from the server.
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// Prefixes may be cached on the server
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func (resolver *Resolver) AllPrefixes(ctx context.Context) (map[string]string, error) {
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instances, err := resolver.Instances.All(ctx)
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if err != nil {
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return nil, err
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}
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gPrefixes := make(map[string]string)
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var lastErr error
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for _, instance := range instances {
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if instance.Prefixes().NoPrefix() {
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continue
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}
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url := instance.URL().String()
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// failed to fetch prefixes for this particular instance
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// => skip it!
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prefixes, err := instance.Prefixes().AllCached(ctx)
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if err != nil {
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lastErr = err
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continue
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}
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for _, p := range prefixes {
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gPrefixes[p] = url
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}
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}
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return gPrefixes, lastErr
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}
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