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fda720b880
issue: #33285 - add two grpc resolver (by session and by streaming coord assignment service) - add one grpc balancer (by serverID and roundrobin) - add lazy conn to avoid block by first service discovery - add some utility function for streaming service Signed-off-by: chyezh <chyezh@outlook.com>
47 lines
1.6 KiB
Go
47 lines
1.6 KiB
Go
package resolver
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import (
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"context"
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"errors"
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"google.golang.org/grpc/resolver"
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"github.com/milvus-io/milvus/internal/util/streamingutil/service/discoverer"
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)
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type VersionedState = discoverer.VersionedState
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var (
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ErrCanceled = errors.New("canceled")
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ErrInterrupted = errors.New("interrupted")
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)
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// Builder is the interface for the grpc resolver builder.
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// It owns a Resolver instance and build grpc.Resolver from it.
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type Builder interface {
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resolver.Builder
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// Resolver returns the underlying resolver instance.
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Resolver() Resolver
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// Close the builder, release the underlying resolver instance.
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Close()
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}
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// Resolver is the interface for the service discovery in grpc.
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// Allow the user to get the grpc service discovery results and watch the changes.
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// Not all changes can be arrived by these api, only the newest state is guaranteed.
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type Resolver interface {
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// GetLatestState returns the latest state of the resolver.
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// The returned state should be read only, applied any change to it will cause data race.
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GetLatestState() VersionedState
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// Watch watch the state change of the resolver.
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// cb will be called with latest state after call, and will be called with new state when state changed.
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// version may be skipped if the state is changed too fast, and latest version can be seen by cb.
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// Watch is keep running until ctx is canceled or cb first return error.
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// - Return error with ErrCanceled mark when ctx is canceled.
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// - Return error with ErrInterrupted when cb returns.
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Watch(ctx context.Context, cb func(VersionedState) error) error
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}
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