forked from TrueCloudLab/frostfs-node
29e974df93
Implement `Controller` designed to analyze the values collected by the local node (the source is hidden behind Writer/WriterProvider interfaces) and transfer them to the destination (hidden behind Iterator / IteratorProvider interface). Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
83 lines
2.5 KiB
Go
83 lines
2.5 KiB
Go
package trustcontroller
|
|
|
|
import (
|
|
"context"
|
|
"io"
|
|
|
|
"github.com/nspcc-dev/neofs-node/pkg/services/reputation"
|
|
)
|
|
|
|
// Context wraps stdlib context
|
|
// with accompanying meta values.
|
|
type Context interface {
|
|
context.Context
|
|
|
|
// Must return epoch number to select the values.
|
|
Epoch() uint64
|
|
}
|
|
|
|
// Writer describes the interface for storing reputation.Trust values.
|
|
//
|
|
// This interface is provided by both local storage
|
|
// of values and remote (wrappers over the RPC).
|
|
type Writer interface {
|
|
// Write performs a write operation of reputation.Trust value
|
|
// and returns any error encountered.
|
|
//
|
|
// All values after the Close call must be flushed to the
|
|
// physical target. Implementations can cache values before
|
|
// Close operation.
|
|
//
|
|
// Put must not be called after Close.
|
|
Write(reputation.Trust) error
|
|
|
|
// Close exits with method-providing Writer.
|
|
//
|
|
// All cached values must be flushed before
|
|
// the Close's return.
|
|
//
|
|
// Methods must not be called after Close.
|
|
io.Closer
|
|
}
|
|
|
|
// WriterProvider is a group of methods provided
|
|
// by entity which generates keepers of
|
|
// reputation.Trust values.
|
|
type WriterProvider interface {
|
|
// InitWriter should return an initialized Writer.
|
|
//
|
|
// Initialization problems are reported via error.
|
|
// If no error was returned, then the Writer must not be nil.
|
|
//
|
|
// Implementations can have different logic for different
|
|
// contexts, so specific ones may document their own behavior.
|
|
InitWriter(Context) (Writer, error)
|
|
}
|
|
|
|
// Iterator is a group of methods provided by entity
|
|
// which can iterate over a group of reputation.Trust values.
|
|
type Iterator interface {
|
|
// Iterate must start an iterator over all trust values.
|
|
// For each value should call a handler, the error
|
|
// of which should be directly returned from the method.
|
|
//
|
|
// Internal failures of the iterator are also signaled via
|
|
// an error. After a successful call to the last value
|
|
// handler, nil should be returned.
|
|
Iterate(reputation.TrustHandler) error
|
|
}
|
|
|
|
// IteratorProvider is a group of methods provided
|
|
// by entity which generates iterators over
|
|
// reputation.Trust values.
|
|
type IteratorProvider interface {
|
|
// InitIterator should return an initialized Iterator
|
|
// that iterates over values from IteratorContext.Epoch() epoch.
|
|
//
|
|
// Initialization problems are reported via error.
|
|
// If no error was returned, then the Iterator must not be nil.
|
|
//
|
|
// Implementations can have different logic for different
|
|
// contexts, so specific ones may document their own behavior.
|
|
InitIterator(Context) (Iterator, error)
|
|
}
|