Module 0x2::config

• Resource Config
• Struct Setting
• Struct SettingData
• Constants
• Function new
• Function create
• Function add_for_current_epoch
• Function remove_for_current_epoch
• Function exists_with_type
• Function exists_with_type_for_current_epoch
• Function borrow_for_current_epoch_mut
• Function borrow_most_recent
• Function read_setting
• Function read_setting_impl

use 0x1::option;
use 0x2::dynamic_field;
use 0x2::object;
use 0x2::transfer;
use 0x2::tx_context;

Resource Config

struct Config<WriteCap> has key

Fields

id: object::UID

Struct Setting

struct Setting<Value: copy, drop, store> has drop, store

Fields

data: option::Option<config::SettingData<Value>>

Struct SettingData

struct SettingData<Value: copy, drop, store> has drop, store

Fields

newer_value_epoch: u64

newer_value: option::Option<Value>

older_value_opt: option::Option<Value>

Constants

const EBCSSerializationFailure: u64 = 2;

const EAlreadySetForEpoch: u64 = 0;

const ENotSetForEpoch: u64 = 1;

Function new

public(friend) fun new<WriteCap>(_cap: &mut WriteCap, ctx: &mut tx_context::TxContext): config::Config<WriteCap>

Implementation

public(package) fun new<WriteCap>(_cap: &mut WriteCap, ctx: &mut TxContext): Config<WriteCap> {
    Config<WriteCap> { id: object::new(ctx) }
}

Function create

public(friend) fun create<WriteCap>(cap: &mut WriteCap, ctx: &mut tx_context::TxContext)

Implementation

public(package) fun create<WriteCap>(cap: &mut WriteCap, ctx: &mut TxContext) {
    transfer::share_object(new<WriteCap>(cap, ctx))
}

Function add_for_current_epoch

public(friend) fun add_for_current_epoch<WriteCap, Name: copy, drop, store, Value: copy, drop, store>(config: &mut config::Config<WriteCap>, _cap: &mut WriteCap, name: Name, value: Value, ctx: &mut tx_context::TxContext): option::Option<Value>

Implementation

public(package) fun add_for_current_epoch<
    WriteCap,
    Name: copy + drop + store,
    Value: copy + drop + store,
>(
    config: &mut Config<WriteCap>,
    _cap: &mut WriteCap,
    name: Name,
    value: Value,
    ctx: &mut TxContext,
): Option<Value> {
    let epoch = ctx.epoch();
    if (!field::exists_(&config.id, name)) {
        let sobj = Setting {
            data: option::some(SettingData {
                newer_value_epoch: epoch,
                newer_value: option::some(value),
                older_value_opt: option::none(),
            }),
        };
        field::add(&mut config.id, name, sobj);
        option::none()
    } else {
        let sobj: &mut Setting<Value> = field::borrow_mut(&mut config.id, name);
        let SettingData {
            newer_value_epoch,
            newer_value,
            older_value_opt,
        } = sobj.data.extract();
        let (older_value_opt, removed_value) =
            if (epoch > newer_value_epoch) {
                // if the `newer_value` is for a previous epoch, move it to `older_value_opt`
                (move newer_value, move older_value_opt)
            } else {
                // the current epoch cannot be less than the `newer_value_epoch`
                assert!(epoch == newer_value_epoch);
                // if the `newer_value` is for the current epoch, then the option must be `none`
                assert!(newer_value.is_none(), EAlreadySetForEpoch);
                (move older_value_opt, option::none())
            };
        sobj.data.fill(SettingData {
            newer_value_epoch: epoch,
            newer_value: option::some(value),
            older_value_opt,
        });
        removed_value
    }
}

Function remove_for_current_epoch

public(friend) fun remove_for_current_epoch<WriteCap, Name: copy, drop, store, Value: copy, drop, store>(config: &mut config::Config<WriteCap>, _cap: &mut WriteCap, name: Name, ctx: &mut tx_context::TxContext): option::Option<Value>

Implementation

public(package) fun remove_for_current_epoch<
    WriteCap,
    Name: copy + drop + store,
    Value: copy + drop + store,
>(
    config: &mut Config<WriteCap>,
    _cap: &mut WriteCap,
    name: Name,
    ctx: &mut TxContext,
): Option<Value> {
    let epoch = ctx.epoch();
    if (!field::exists_(&config.id, name)) return option::none();
    let sobj: &mut Setting<Value> = field::borrow_mut(&mut config.id, name);
    let SettingData {
        newer_value_epoch,
        newer_value,
        older_value_opt,
    } = sobj.data.extract();
    let (older_value_opt, removed_value) =
        if (epoch > newer_value_epoch) {
            // if the `newer_value` is for a previous epoch, move it to `older_value_opt`
            (move newer_value, option::none())
        } else {
            // the current epoch cannot be less than the `newer_value_epoch`
            assert!(epoch == newer_value_epoch);
            (move older_value_opt, move newer_value)
        };
    let older_value_opt_is_none = older_value_opt.is_none();
    sobj.data.fill(SettingData {
        newer_value_epoch: epoch,
        newer_value: option::none(),
        older_value_opt,
    });
    if (older_value_opt_is_none) {
        field::remove<_, Setting<Value>>(&mut config.id, name);
    };
    removed_value
}

Function exists_with_type

public(friend) fun exists_with_type<WriteCap, Name: copy, drop, store, Value: copy, drop, store>(config: &config::Config<WriteCap>, name: Name): bool

Implementation

public(package) fun exists_with_type<
    WriteCap,
    Name: copy + drop + store,
    Value: copy + drop + store,
>(
    config: &Config<WriteCap>,
    name: Name,
): bool {
    field::exists_with_type<_, Setting<Value>>(&config.id, name)
}

Function exists_with_type_for_current_epoch

public(friend) fun exists_with_type_for_current_epoch<WriteCap, Name: copy, drop, store, Value: copy, drop, store>(config: &config::Config<WriteCap>, name: Name, ctx: &tx_context::TxContext): bool

Implementation

public(package) fun exists_with_type_for_current_epoch<
    WriteCap,
    Name: copy + drop + store,
    Value: copy + drop + store,
>(
    config: & Config<WriteCap>,
    name: Name,
    ctx: &TxContext,
): bool {
    field::exists_with_type<_, Setting<Value>>(&config.id, name) && {
        let epoch = ctx.epoch();
        let sobj: &Setting<Value> = field::borrow(&config.id, name);
        epoch == sobj.data.borrow().newer_value_epoch &&
        sobj.data.borrow().newer_value.is_some()
    }
}

Function borrow_for_current_epoch_mut

public(friend) fun borrow_for_current_epoch_mut<WriteCap, Name: copy, drop, store, Value: copy, drop, store>(config: &mut config::Config<WriteCap>, _cap: &mut WriteCap, name: Name, ctx: &mut tx_context::TxContext): &mut Value

Implementation

public(package) fun borrow_for_current_epoch_mut<
    WriteCap,
    Name: copy + drop + store,
    Value: copy + drop + store,
>(
    config: &mut Config<WriteCap>,
    _cap: &mut WriteCap,
    name: Name,
    ctx: &mut TxContext,
): &mut Value {
    let epoch = ctx.epoch();
    let sobj: &mut Setting<Value> = field::borrow_mut(&mut config.id, name);
    let data = sobj.data.borrow_mut();
    assert!(data.newer_value_epoch == epoch, ENotSetForEpoch);
    assert!(data.newer_value.is_some(), ENotSetForEpoch);
    data.newer_value.borrow_mut()
}

Function borrow_most_recent

public(friend) fun borrow_most_recent<WriteCap, Name: copy, drop, store, Value: copy, drop, store>(config: &config::Config<WriteCap>, name: Name): &Value

Implementation

public(package) fun borrow_most_recent<
    WriteCap,
    Name: copy + drop + store,
    Value: copy + drop + store,
>(
    config: &Config<WriteCap>,
    name: Name,
): &Value {
    let sobj: &Setting<Value> = field::borrow(&config.id, name);
    let data = sobj.data.borrow();
    assert!(data.newer_value.is_some(), ENotSetForEpoch);
    data.newer_value.borrow()
}

Function read_setting

public(friend) fun read_setting<Name: copy, drop, store, Value: copy, drop, store>(config: object::ID, name: Name, ctx: &tx_context::TxContext): option::Option<Value>

Implementation

public(package) fun read_setting<Name: copy + drop + store, Value: copy + drop + store>(
    config: ID,
    name: Name,
    ctx: &TxContext,
): Option<Value> {
    use sui::dynamic_field::Field;
    let config_id = config.to_address();
    let setting_df = field::hash_type_and_key(config_id, name);
    read_setting_impl<Field<Name, Setting<Value>>, Setting<Value>, SettingData<Value>, Value>(
        config_id,
        setting_df,
        ctx.epoch(),
    )
}

Function read_setting_impl

fun read_setting_impl<FieldSettingValue: key, SettingValue: store, SettingDataValue: store, Value: copy, drop, store>(config: address, name: address, current_epoch: u64): option::Option<Value>

Implementation

native fun read_setting_impl<
    FieldSettingValue: key,
    SettingValue: store,
    SettingDataValue: store,
    Value: copy + drop + store,
>(
    config: address,
    name: address,
    current_epoch: u64,
): Option<Value>;