86 lines
2.4 KiB
Go
86 lines
2.4 KiB
Go
package eigentrustctrl
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import (
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"fmt"
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"sync"
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"github.com/TrueCloudLab/frostfs-node/pkg/util"
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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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// Component of computing iteration of EigenTrust algorithm.
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//
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// Must not be nil.
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DaughtersTrustCalculator DaughtersTrustCalculator
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// IterationsProvider provides information about numbers
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// of iterations for algorithm.
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IterationsProvider IterationsProvider
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// Routine execution pool for single epoch iteration.
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WorkerPool util.WorkerPool
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}
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// Controller represents EigenTrust algorithm transient controller.
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//
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// Controller's main goal is to separate the two main stages of
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// the calculation:
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// 1. reporting local values to manager nodes
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// 2. calculating global trusts of child nodes
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//
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// Calculation stages are controlled based on external signals
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// that come from the application through the Controller's API.
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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]*iterContextCancel
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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.IterationsProvider == nil:
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panicOnPrmValue("IterationNumber", prm.IterationsProvider)
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case prm.WorkerPool == nil:
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panicOnPrmValue("WorkerPool", prm.WorkerPool)
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case prm.DaughtersTrustCalculator == nil:
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panicOnPrmValue("DaughtersTrustCalculator", prm.DaughtersTrustCalculator)
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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]*iterContextCancel),
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}
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}
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