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Implement all storage after prefix (#4227)

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* Implement all storage after prefix

* fix test, bump version and fix doc

* bump metadata version

* Update frame/support/procedural/src/storage/storage_struct.rs
This commit is contained in:
thiolliere
2019-11-27 19:23:20 +01:00
committed by Gavin Wood
parent dcaabbaacf
commit f4035cd5ac
15 changed files with 310 additions and 325 deletions
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substrate/frame/support/procedural/src/lib.rs
+38 -8
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@@ -56,7 +56,15 @@ use proc_macro::TokenStream;
/// * Value: `Foo: type`: Implements the
/// [`StorageValue`](../frame_support/storage/trait.StorageValue.html) trait using the
/// [`StorageValue generator`](../frame_support/storage/generator/trait.StorageValue.html).
/// The generator `unhashed_key` is `$module_prefix ++ " " ++ $storage_name`
///
/// The generator is implemented with:
/// * `module_prefix`: module_prefix
/// * `storage_prefix`: storage_name
///
/// Thus the storage value is finally stored at:
/// ```nocompile
/// Twox128(module_prefix) ++ Twox128(storage_prefix)
/// ```
///
/// * Map: `Foo: map hasher($hash) type => type`: Implements the
/// [`StorageMap`](../frame_support/storage/trait.StorageMap.html) trait using the
@@ -69,9 +77,15 @@ use proc_macro::TokenStream;
/// with care, see generator documentation.
///
/// The generator is implemented with:
/// * `prefix`: `$module_prefix ++ " " ++ $storage_name`
/// * `module_prefix`: $module_prefix
/// * `storage_prefix`: storage_name
/// * `Hasher`: $hash
///
/// Thus the keys are stored at:
/// ```nocompile
/// twox128(module_prefix) ++ twox128(storage_prefix) ++ hasher(encode(key))
/// ```
///
/// * Linked map: `Foo: linked_map hasher($hash) type => type`: Implements the
/// [`StorageLinkedMap`](../frame_support/storage/trait.StorageLinkedMap.html) trait using the
/// [`StorageLinkedMap generator`](../frame_support/storage/generator/trait.StorageLinkedMap.html).
@@ -82,15 +96,25 @@ use proc_macro::TokenStream;
/// `hasher($hash)` is optional and its default is `blake2_256`. One should use another hasher
/// with care, see generator documentation.
///
/// The generator is implemented with:
/// * `prefix`: `$module_prefix ++ " " ++ $storage_name`
/// * `head_key`: `"head of " ++ $module_prefix ++ " " ++ $storage_name`
/// * `Hasher`: $hash
///
/// All key formatting logic can be accessed in a type-agnostic format via the
/// [`KeyFormat`](../srml_support/storage/generator/trait.KeyFormat.html) trait, which
/// is implemented for the storage linked map type as well.
///
/// The generator key format is implemented with:
/// * `module_prefix`: $module_prefix
/// * `storage_prefix`: storage_name
/// * `head_prefix`: `"HeadOf" ++ storage_name`
/// * `Hasher`: $hash
///
/// Thus the keys are stored at:
/// ```nocompile
/// Twox128(module_prefix) ++ Twox128(storage_prefix) ++ Hasher(encode(key))
/// ```
/// and head is stored at:
/// ```nocompile
/// Twox128(module_prefix) ++ Twox128(head_prefix)
/// ```
///
/// * Double map: `Foo: double_map hasher($hash1) u32, $hash2(u32) => u32`: Implements the
/// [`StorageDoubleMap`](../frame_support/storage/trait.StorageDoubleMap.html) trait using the
/// [`StorageDoubleMap generator`](../frame_support/storage/generator/trait.StorageDoubleMap.html).
@@ -111,10 +135,16 @@ use proc_macro::TokenStream;
/// Otherwise, other items in storage with the same first key can be compromised.
///
/// The generator is implemented with:
/// * `key1_prefix`: `$module_prefix ++ " " ++ $storage_name`
/// * `module_prefix`: $module_prefix
/// * `storage_prefix`: storage_name
/// * `Hasher1`: $hash1
/// * `Hasher2`: $hash2
///
/// Thus keys are stored at:
/// ```nocompile
/// Twox128(module_prefix) ++ Twox128(storage_prefix) ++ Hasher1(encode(key1)) ++ Hasher2(encode(key2))
/// ```
///
/// Supported hashers (ordered from least to best security):
///
/// * `twox_64_concat` - TwoX with 64bit + key concatenated.