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>
82 lines
2.1 KiB
Go
82 lines
2.1 KiB
Go
package trustcontroller
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import (
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"context"
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"fmt"
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"sync"
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)
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// Prm groups the required parameters of the Controller's constructor.
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//
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// All values must comply with the requirements imposed on them.
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// Passing incorrect parameter values will result in constructor
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// failure (error or panic depending on the implementation).
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type Prm struct {
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// Iterator over the reputation values
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// collected by the node locally.
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//
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// Must not be nil.
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LocalTrustSource IteratorProvider
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// Place of recording the local values of
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// the used space of containers.
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//
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// Must not be nil.
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LocalTrustTarget WriterProvider
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}
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// Controller represents main handler for starting
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// and interrupting the reporting local trust values.
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//
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// It binds the interfaces of the local value stores
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// to the target storage points. Controller is abstracted
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// from the internal storage device and the network location
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// of the connecting components. At its core, it is a
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// high-level start-stop trigger for reporting.
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//
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// For correct operation, the controller must be created
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// using the constructor (New) based on the required parameters
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// and optional components. After successful creation,
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// the constructor is immediately ready to work through
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// API of external control of calculations and data transfer.
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type Controller struct {
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prm Prm
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opts *options
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mtx sync.Mutex
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mCtx map[uint64]context.CancelFunc
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}
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const invalidPrmValFmt = "invalid parameter %s (%T):%v"
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func panicOnPrmValue(n string, v interface{}) {
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panic(fmt.Sprintf(invalidPrmValFmt, n, v, v))
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}
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// New creates a new instance of the Controller.
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//
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// Panics if at least one value of the parameters is invalid.
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//
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// The created Controller does not require additional
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// initialization and is completely ready for work
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func New(prm Prm, opts ...Option) *Controller {
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switch {
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case prm.LocalTrustSource == nil:
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panicOnPrmValue("LocalTrustSource", prm.LocalTrustSource)
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case prm.LocalTrustTarget == nil:
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panicOnPrmValue("LocalTrustTarget", prm.LocalTrustTarget)
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}
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o := defaultOpts()
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for _, opt := range opts {
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opt(o)
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}
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return &Controller{
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prm: prm,
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opts: o,
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mCtx: make(map[uint64]context.CancelFunc),
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}
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}
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