frostfs-node/pkg/services/reputation/eigentrust/controller/controller.go

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package eigentrustctrl
import (
"fmt"
"sync"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util"
)
// Prm groups the required parameters of the Controller's constructor.
//
// All values must comply with the requirements imposed on them.
// Passing incorrect parameter values will result in constructor
// failure (error or panic depending on the implementation).
type Prm struct {
// Component of computing iteration of EigenTrust algorithm.
//
// Must not be nil.
DaughtersTrustCalculator DaughtersTrustCalculator
// IterationsProvider provides information about numbers
// of iterations for algorithm.
IterationsProvider IterationsProvider
// Routine execution pool for single epoch iteration.
WorkerPool util.WorkerPool
}
// Controller represents EigenTrust algorithm transient controller.
//
// Controller's main goal is to separate the two main stages of
// the calculation:
// 1. reporting local values to manager nodes
// 2. calculating global trusts of child nodes
//
// Calculation stages are controlled based on external signals
// that come from the application through the Controller's API.
//
// For correct operation, the controller must be created
// using the constructor (New) based on the required parameters
// and optional components. After successful creation,
// the constructor is immediately ready to work through
// API of external control of calculations and data transfer.
type Controller struct {
prm Prm
opts *options
mtx sync.Mutex
mCtx map[uint64]*iterContextCancel
}
const invalidPrmValFmt = "invalid parameter %s (%T):%v"
func panicOnPrmValue(n string, v any) {
panic(fmt.Sprintf(invalidPrmValFmt, n, v, v))
}
// New creates a new instance of the Controller.
//
// Panics if at least one value of the parameters is invalid.
//
// The created Controller does not require additional
// initialization and is completely ready for work.
func New(prm Prm, opts ...Option) *Controller {
switch {
case prm.IterationsProvider == nil:
panicOnPrmValue("IterationNumber", prm.IterationsProvider)
case prm.WorkerPool == nil:
panicOnPrmValue("WorkerPool", prm.WorkerPool)
case prm.DaughtersTrustCalculator == nil:
panicOnPrmValue("DaughtersTrustCalculator", prm.DaughtersTrustCalculator)
}
o := defaultOpts()
for _, opt := range opts {
opt(o)
}
return &Controller{
prm: prm,
opts: o,
mCtx: make(map[uint64]*iterContextCancel),
}
}