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Support serialization of fixed-size arrays in abi_serializer. #1918

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Support serialization of fixed-size arrays in abi_serializer. #1918

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c574f08
wip to support arrays in abi_serializer.
greg7mdp Nov 18, 2023
f2c478c
Fix issue - now `abi_tests.cpp` do pass.
greg7mdp Nov 18, 2023
401cf8a
Better support for fixed-size arrays (don't serialize the size)
greg7mdp Nov 18, 2023
e41b934
Update abi name in test: `currency_abi` -> `test_abi`
greg7mdp Nov 18, 2023
96ad7e4
Add test where fixed-size array is serialized with wrong number of va…
greg7mdp Nov 18, 2023
8fc8ec2
Merge branch 'main' of github.com:AntelopeIO/leap into abi_serializer…
greg7mdp Nov 21, 2023
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81 changes: 51 additions & 30 deletions libraries/chain/abi_serializer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -218,17 +218,23 @@ namespace eosio { namespace chain {
return ends_with(type, "[]");
}

bool abi_serializer::is_szarray(const string_view& type)const {
std::optional<fc::unsigned_int> abi_serializer::is_szarray(const string_view& type)const {
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auto pos1 = type.find_last_of('[');
auto pos2 = type.find_last_of(']');
if(pos1 == string_view::npos || pos2 == string_view::npos) return false;
if(pos1 == string_view::npos || pos2 == string_view::npos)
return {};
auto pos = pos1 + 1;
if(pos == pos2) return false;
if(pos == pos2)
return {};

fc::unsigned_int sz = 0;
while(pos < pos2) {
if( ! (type[pos] >= '0' && type[pos] <= '9') ) return false;
if( ! (type[pos] >= '0' && type[pos] <= '9') )
return {};
sz = 10 * sz + (type[pos] - '0');
++pos;
}
return true;
return sz;
}

bool abi_serializer::is_optional(const string_view& type)const {
Expand Down Expand Up @@ -400,8 +406,26 @@ namespace eosio { namespace chain {
auto h = ctx.enter_scope();
auto rtype = resolve_type(type);
auto ftype = fundamental_type(rtype);
auto btype = built_in_types.find(ftype );
if( btype != built_in_types.end() ) {
auto fixed_array_sz = is_szarray(rtype);

auto read_array = [&](fc::unsigned_int::base_uint sz) {
ctx.hint_array_type_if_in_array();
vector<fc::variant> vars;
vars.reserve(sz);
auto h1 = ctx.push_to_path( impl::array_index_path_item{} );
for( fc::unsigned_int::base_uint i = 0; i < sz; ++i ) {
ctx.set_array_index_of_path_back(i);
auto v = _binary_to_variant(ftype, stream, ctx);
// The exception below is commented out to allow array of optional as input data
//EOS_ASSERT( !v.is_null(), unpack_exception, "Invalid packed array '${p}'", ("p", ctx.get_path_string()) );
vars.emplace_back(std::move(v));
}
return fc::variant( std::move(vars) );
};

if (fixed_array_sz) {
return read_array(*fixed_array_sz);
} else if( auto btype = built_in_types.find(ftype ); btype != built_in_types.end() ) {
try {
return btype->second.first(stream, is_array(rtype), is_optional(rtype), ctx.get_yield_function());
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} EOS_RETHROW_EXCEPTIONS( unpack_exception, "Unable to unpack ${class} type '${type}' while processing '${p}'",
Expand All @@ -414,21 +438,7 @@ namespace eosio { namespace chain {
try {
fc::raw::unpack(stream, size);
} EOS_RETHROW_EXCEPTIONS( unpack_exception, "Unable to unpack size of array '${p}'", ("p", ctx.get_path_string()) )
vector<fc::variant> vars;
auto h1 = ctx.push_to_path( impl::array_index_path_item{} );
for( decltype(size.value) i = 0; i < size; ++i ) {
ctx.set_array_index_of_path_back(i);
auto v = _binary_to_variant(ftype, stream, ctx);
// The exception below is commented out to allow array of optional as input data
//EOS_ASSERT( !v.is_null(), unpack_exception, "Invalid packed array '${p}'", ("p", ctx.get_path_string()) );
vars.emplace_back(std::move(v));
}
// QUESTION: Why would the assert below ever fail?
EOS_ASSERT( vars.size() == size.value,
unpack_exception,
"packed size does not match unpacked array size, packed size ${p} actual size ${a}",
("p", size)("a", vars.size()) );
return fc::variant( std::move(vars) );
return read_array(size.value);
} else if ( is_optional(rtype) ) {
char flag;
try {
Expand Down Expand Up @@ -496,14 +506,9 @@ namespace eosio { namespace chain {
auto v_itr = variants.end();
auto s_itr = structs.end();

auto btype = built_in_types.find(fundamental_type(rtype));
if( btype != built_in_types.end() ) {
btype->second.second(var, ds, is_array(rtype), is_optional(rtype), ctx.get_yield_function());
} else if ( is_array(rtype) ) {
ctx.hint_array_type_if_in_array();
vector<fc::variant> vars = var.get_array();
fc::raw::pack(ds, (fc::unsigned_int)vars.size());
auto fixed_array_sz = is_szarray(rtype);

auto pack_array = [&](const vector<fc::variant>& vars) {
auto h1 = ctx.push_to_path( impl::array_index_path_item{} );
auto h2 = ctx.disallow_extensions_unless(false);

Expand All @@ -512,7 +517,23 @@ namespace eosio { namespace chain {
ctx.set_array_index_of_path_back(i);
_variant_to_binary(fundamental_type(rtype), var, ds, ctx);
++i;
}
}
};

if (fixed_array_sz) {
size_t sz = *fixed_array_sz;
ctx.hint_array_type_if_in_array();
const vector<fc::variant>& vars = var.get_array();
EOS_ASSERT( vars.size() == sz, pack_exception,
"Incorrect number of values provided (${a}) for fixed-size (${b}) array type", ("a", sz)("b", vars.size()));
pack_array(vars);
} else if( auto btype = built_in_types.find(fundamental_type(rtype)); btype != built_in_types.end() ) {
btype->second.second(var, ds, is_array(rtype), is_optional(rtype), ctx.get_yield_function());
} else if ( is_array(rtype) ) {
ctx.hint_array_type_if_in_array();
const vector<fc::variant>& vars = var.get_array();
fc::raw::pack(ds, (fc::unsigned_int)vars.size());
pack_array(vars);
} else if( is_optional(rtype) ) {
char flag = !var.is_null();
fc::raw::pack(ds, flag);
Expand Down
2 changes: 1 addition & 1 deletion libraries/chain/include/eosio/chain/abi_serializer.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -47,7 +47,7 @@ struct abi_serializer {
/// @return string_view of `t` or internal string type
std::string_view resolve_type(const std::string_view& t)const;
bool is_array(const std::string_view& type)const;
bool is_szarray(const std::string_view& type)const;
std::optional<fc::unsigned_int> is_szarray(const std::string_view& type)const;
bool is_optional(const std::string_view& type)const;
bool is_type( const std::string_view& type, const yield_function_t& yield )const;
bool is_type(const std::string_view& type, const fc::microseconds& max_serialization_time)const;
Expand Down
21 changes: 11 additions & 10 deletions libraries/libfc/include/fc/io/varint.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,8 @@
namespace fc {

struct unsigned_int {
unsigned_int( uint32_t v = 0 ):value(v){}
using base_uint = uint32_t;
unsigned_int( base_uint v = 0 ):value(v){}

template<typename T>
unsigned_int( T v ):value(v){}
Expand All @@ -14,22 +15,22 @@ struct unsigned_int {

unsigned_int& operator=( int32_t v ) { value = v; return *this; }

uint32_t value;
base_uint value;

friend bool operator==( const unsigned_int& i, const uint32_t& v ) { return i.value == v; }
friend bool operator==( const uint32_t& i, const unsigned_int& v ) { return i == v.value; }
friend bool operator==( const unsigned_int& i, const base_uint& v ) { return i.value == v; }
friend bool operator==( const base_uint& i, const unsigned_int& v ) { return i == v.value; }
friend bool operator==( const unsigned_int& i, const unsigned_int& v ) { return i.value == v.value; }

friend bool operator!=( const unsigned_int& i, const uint32_t& v ) { return i.value != v; }
friend bool operator!=( const uint32_t& i, const unsigned_int& v ) { return i != v.value; }
friend bool operator!=( const unsigned_int& i, const base_uint& v ) { return i.value != v; }
friend bool operator!=( const base_uint& i, const unsigned_int& v ) { return i != v.value; }
friend bool operator!=( const unsigned_int& i, const unsigned_int& v ) { return i.value != v.value; }

friend bool operator<( const unsigned_int& i, const uint32_t& v ) { return i.value < v; }
friend bool operator<( const uint32_t& i, const unsigned_int& v ) { return i < v.value; }
friend bool operator<( const unsigned_int& i, const base_uint& v ) { return i.value < v; }
friend bool operator<( const base_uint& i, const unsigned_int& v ) { return i < v.value; }
friend bool operator<( const unsigned_int& i, const unsigned_int& v ) { return i.value < v.value; }

friend bool operator>=( const unsigned_int& i, const uint32_t& v ) { return i.value >= v; }
friend bool operator>=( const uint32_t& i, const unsigned_int& v ) { return i >= v.value; }
friend bool operator>=( const unsigned_int& i, const base_uint& v ) { return i.value >= v; }
friend bool operator>=( const base_uint& i, const unsigned_int& v ) { return i >= v.value; }
friend bool operator>=( const unsigned_int& i, const unsigned_int& v ) { return i.value >= v.value; }
};

Expand Down
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