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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>
30 lines
898 B
Go
30 lines
898 B
Go
package discoverer
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import (
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"context"
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"google.golang.org/grpc/resolver"
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"github.com/milvus-io/milvus/pkg/util/typeutil"
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)
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// Discoverer is the interface for the discoverer.
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// Do not promise
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// 1. concurrent safe.
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// 2. the version of discovery may be repeated or decreasing. So user should check the version in callback.
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type Discoverer interface {
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// NewVersionedState returns a lowest versioned state.
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NewVersionedState() VersionedState
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// Discover watches the service discovery on these goroutine.
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// 1. Call the callback when the discovery is changed, and block until the discovery is canceled or break down.
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// 2. Discover should always send the current state first and then block.
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Discover(ctx context.Context, cb func(VersionedState) error) error
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}
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// VersionedState is the state with version.
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type VersionedState struct {
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Version typeutil.Version
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State resolver.State
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}
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