0g-chain/x/committee/spec/02_state.md

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# State
## Genesis state
`GenesisState` defines the state that must be persisted when the blockchain stops/restarts in order for normal function of the committee module to resume.
```go
// GenesisState is state that must be provided at chain genesis.
type GenesisState struct {
NextProposalID uint64 `json:"next_proposal_id" yaml:"next_proposal_id"`
Committees []Committee `json:"committees" yaml:"committees"`
Proposals []Proposal `json:"proposals" yaml:"proposals"`
Votes []Vote `json:"votes" yaml:"votes"`
}
```
## Committees
Each committee conforms to the `Committee` interface and is defined as either a `MemberCommittee` or a `TokenCommittee`:
```go
// Committee is an interface for handling common actions on committees
type Committee interface {
GetID() uint64
GetType() string
GetDescription() string
GetMembers() []sdk.AccAddress
SetMembers([]sdk.AccAddress) BaseCommittee
HasMember(addr sdk.AccAddress) bool
GetPermissions() []Permission
SetPermissions([]Permission) Committee
HasPermissionsFor(ctx sdk.Context, appCdc *codec.Codec, pk ParamKeeper, proposal PubProposal) bool
GetProposalDuration() time.Duration
SetProposalDuration(time.Duration) BaseCommittee
GetVoteThreshold() sdk.Dec
SetVoteThreshold(sdk.Dec) BaseCommittee
GetTallyOption() TallyOption
Validate() error
}
// BaseCommittee is a common type shared by all Committees
type BaseCommittee struct {
ID uint64 `json:"id" yaml:"id"`
Description string `json:"description" yaml:"description"`
Members []sdk.AccAddress `json:"members" yaml:"members"`
Permissions []Permission `json:"permissions" yaml:"permissions"`
VoteThreshold sdk.Dec `json:"vote_threshold" yaml:"vote_threshold"` // Smallest percentage that must vote for a proposal to pass
ProposalDuration time.Duration `json:"proposal_duration" yaml:"proposal_duration"` // The length of time a proposal remains active for. Proposals will close earlier if they get enough votes.
TallyOption TallyOption `json:"tally_option" yaml:"tally_option"`
}
// MemberCommittee is an alias of BaseCommittee
type MemberCommittee struct {
BaseCommittee `json:"base_committee" yaml:"base_committee"`
}
// TokenCommittee supports voting on proposals by token holders
type TokenCommittee struct {
BaseCommittee `json:"base_committee" yaml:"base_committee"`
Quorum sdk.Dec `json:"quorum" yaml:"quorum"`
TallyDenom string `json:"tally_denom" yaml:"tally_denom"`
}
```
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## Store
For complete implementation details for how items are stored, see [keys.go](../types/keys.go). The committee module store state consists of committees, proposals, and votes. When a proposal expires or passes, the proposal and associated votes are deleted from state.