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seal: Rework contracts API (#6573)

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* Transition getter functions to not use scratch buffer

* Remove scratch buffer from ext_get_storage

* Remove scratch buffer from ext_call

* Remove scratch buffer from ext_instantiate

* Add ext_input and remove scratch buffer

* Rework error handling (changes RPC exposed data)

* ext_return passes a flags field instead of a return code
	* Flags is only for seal and not for the caller
	* flags: u32 replaced status_code: u8 in RPC exposed type
* API functions use a unified error type (ReturnCode)
* ext_transfer now traps on error to be consistent with call and instantiate

* Remove the no longer used `Dispatched` event

* Updated inline documentation

* Prevent skipping of copying the output for getter API

* Return gas_consumed from the RPC contracts call interface

* Updated COMPLEXTITY.md

* Rename ext_gas_price to ext_weight_to_fee

* Align comments with spaces

* Removed no longer used `ExecError`

* Remove possible panic in `from_typed_value`

* Use a struct as associated data for SpecialTrap::Return

* Fix nits in COMPLEXITY.md

* Renamed SpecialTrap to TrapReason

* Fix test

* Finish renaming special_trap -> trap_reason

* Remove no longer used get_runtime_storage

* fixup! Remove no longer used get_runtime_storage

* Removed tabs for comment aligment
This commit is contained in:
Alexander Theißen
2020-07-09 15:07:02 +02:00
committed by GitHub
parent a4427f3635
commit 25de5b5c78
26 changed files with 1116 additions and 1256 deletions
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substrate/frame/contracts/fixtures/crypto_hashes.wat
+15 -14
View File
@@ -1,7 +1,6 @@
(module
(import "env" "ext_scratch_size" (func $ext_scratch_size (result i32)))
(import "env" "ext_scratch_read" (func $ext_scratch_read (param i32 i32 i32)))
(import "env" "ext_scratch_write" (func $ext_scratch_write (param i32 i32)))
(import "env" "ext_input" (func $ext_input (param i32 i32)))
(import "env" "ext_return" (func $ext_return (param i32 i32 i32)))
(import "env" "ext_hash_sha2_256" (func $ext_hash_sha2_256 (param i32 i32 i32)))
(import "env" "ext_hash_keccak_256" (func $ext_hash_keccak_256 (param i32 i32 i32)))
@@ -25,8 +24,7 @@
;; Called by the tests.
;;
;; The `call` function expects data in a certain format in the scratch
;; buffer.
;; The `call` function expects data in a certain format in the input buffer.
;;
;; 1. The first byte encodes an identifier for the crypto hash function
;; under test. (*)
@@ -34,7 +32,7 @@
;; crypto hash function chosen in 1.
;;
;; The `deploy` function then computes the chosen crypto hash function
;; given the input and puts the result back into the scratch buffer.
;; given the input and puts the result into the output buffer.
;; After contract execution the test driver then asserts that the returned
;; values are equal to the expected bytes for the input and chosen hash
;; function.
@@ -48,33 +46,36 @@
;; | 2 | BLAKE2 | 256 |
;; | 3 | BLAKE2 | 128 |
;; ---------------------------------
(func (export "call") (result i32)
(func (export "call")
(local $chosen_hash_fn i32)
(local $input_len_ptr i32)
(local $input_ptr i32)
(local $input_len i32)
(local $output_ptr i32)
(local $output_len i32)
(local.set $input_len_ptr (i32.const 256))
(local.set $input_ptr (i32.const 10))
(call $ext_scratch_read (local.get $input_ptr) (i32.const 0) (call $ext_scratch_size))
(i32.store (local.get $input_len_ptr) (i32.const 246))
(call $ext_input (local.get $input_ptr) (local.get $input_len_ptr))
(local.set $chosen_hash_fn (i32.load8_u (local.get $input_ptr)))
(if (i32.gt_u (local.get $chosen_hash_fn) (i32.const 7))
;; We check that the chosen hash fn identifier is within bounds: [0,7]
(unreachable)
)
(local.set $input_ptr (i32.add (local.get $input_ptr) (i32.const 1)))
(local.set $input_len (i32.sub (call $ext_scratch_size) (i32.const 1)))
(local.set $output_ptr (i32.const 100))
(local.set $input_len (i32.sub (i32.load (local.get $input_len_ptr)) (i32.const 1)))
(local.set $output_len (i32.load8_u (local.get $chosen_hash_fn)))
(call_indirect (type $hash_fn_sig)
(local.get $input_ptr)
(local.get $input_len)
(local.get $output_ptr)
(local.get $input_ptr)
(local.get $chosen_hash_fn) ;; Which crypto hash function to execute.
)
(call $ext_scratch_write
(local.get $output_ptr) ;; Linear memory location of the output buffer.
(call $ext_return
(i32.const 0)
(local.get $input_ptr) ;; Linear memory location of the output buffer.
(local.get $output_len) ;; Number of output buffer bytes.
)
(i32.const 0)
(unreachable)
)
)