fluencelabs/fluid
1
0
Fork 0
mirror of https://github.com/fluencelabs/fluid synced 2025-04-24 14:22:18 +00:00
Code Issues Projects Releases Wiki Activity

the first version of c backend

Browse Source
This commit is contained in:
vms 2019-08-20 13:46:02 +02:00
parent cd7a0ba9cc
commit 34815dc578
16 changed files with 1257 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
backend-c/Dockerfile Normal file
View File

@ -0,0 +1,14 @@
FROM ubuntu:19.04
RUN apt-get update \
&& apt-get install -y ca-certificates \
curl \
git \
make \
libtinfo5
RUN curl -L https://github.com/CraneStation/wasi-sdk/releases/download/wasi-sdk-6/wasi-sdk-6.0-linux.tar.gz | tar xz --strip-components=1 -C /
VOLUME /code
WORKDIR /code
CMD make

201
backend-c/LICENSE Normal file
View File

@ -0,0 +1,201 @@
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
"Licensor" shall mean the copyright owner or entity authorized by
the copyright owner that is granting the License.
"Legal Entity" shall mean the union of the acting entity and all
other entities that control, are controlled by, or are under common
control with that entity. For the purposes of this definition,
"control" means (i) the power, direct or indirect, to cause the
direction or management of such entity, whether by contract or
otherwise, or (ii) ownership of fifty percent (50%) or more of the
outstanding shares, or (iii) beneficial ownership of such entity.
"You" (or "Your") shall mean an individual or Legal Entity
exercising permissions granted by this License.
"Source" form shall mean the preferred form for making modifications,
including but not limited to software source code, documentation
source, and configuration files.
"Object" form shall mean any form resulting from mechanical
transformation or translation of a Source form, including but
not limited to compiled object code, generated documentation,
and conversions to other media types.
"Work" shall mean the work of authorship, whether in Source or
Object form, made available under the License, as indicated by a
copyright notice that is included in or attached to the work
(an example is provided in the Appendix below).
"Derivative Works" shall mean any work, whether in Source or Object
form, that is based on (or derived from) the Work and for which the
editorial revisions, annotations, elaborations, or other modifications
represent, as a whole, an original work of authorship. For the purposes
of this License, Derivative Works shall not include works that remain
separable from, or merely link (or bind by name) to the interfaces of,
the Work and Derivative Works thereof.
"Contribution" shall mean any work of authorship, including
the original version of the Work and any modifications or additions
to that Work or Derivative Works thereof, that is intentionally
submitted to Licensor for inclusion in the Work by the copyright owner
or by an individual or Legal Entity authorized to submit on behalf of
the copyright owner. For the purposes of this definition, "submitted"
means any form of electronic, verbal, or written communication sent
to the Licensor or its representatives, including but not limited to
communication on electronic mailing lists, source code control systems,
and issue tracking systems that are managed by, or on behalf of, the
Licensor for the purpose of discussing and improving the Work, but
excluding communication that is conspicuously marked or otherwise
designated in writing by the copyright owner as "Not a Contribution."
"Contributor" shall mean Licensor and any individual or Legal Entity
on behalf of whom a Contribution has been received by Licensor and
subsequently incorporated within the Work.
2. Grant of Copyright License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
copyright license to reproduce, prepare Derivative Works of,
publicly display, publicly perform, sublicense, and distribute the
Work and such Derivative Works in Source or Object form.
3. Grant of Patent License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
(except as stated in this section) patent license to make, have made,
use, offer to sell, sell, import, and otherwise transfer the Work,
where such license applies only to those patent claims licensable
by such Contributor that are necessarily infringed by their
Contribution(s) alone or by combination of their Contribution(s)
with the Work to which such Contribution(s) was submitted. If You
institute patent litigation against any entity (including a
cross-claim or counterclaim in a lawsuit) alleging that the Work
or a Contribution incorporated within the Work constitutes direct
or contributory patent infringement, then any patent licenses
granted to You under this License for that Work shall terminate
as of the date such litigation is filed.
4. Redistribution. You may reproduce and distribute copies of the
Work or Derivative Works thereof in any medium, with or without
modifications, and in Source or Object form, provided that You
meet the following conditions:
(a) You must give any other recipients of the Work or
Derivative Works a copy of this License; and
(b) You must cause any modified files to carry prominent notices
stating that You changed the files; and
(c) You must retain, in the Source form of any Derivative Works
that You distribute, all copyright, patent, trademark, and
attribution notices from the Source form of the Work,
excluding those notices that do not pertain to any part of
the Derivative Works; and
(d) If the Work includes a "NOTICE" text file as part of its
distribution, then any Derivative Works that You distribute must
include a readable copy of the attribution notices contained
within such NOTICE file, excluding those notices that do not
pertain to any part of the Derivative Works, in at least one
of the following places: within a NOTICE text file distributed
as part of the Derivative Works; within the Source form or
documentation, if provided along with the Derivative Works; or,
within a display generated by the Derivative Works, if and
wherever such third-party notices normally appear. The contents
of the NOTICE file are for informational purposes only and
do not modify the License. You may add Your own attribution
notices within Derivative Works that You distribute, alongside
or as an addendum to the NOTICE text from the Work, provided
that such additional attribution notices cannot be construed
as modifying the License.
You may add Your own copyright statement to Your modifications and
may provide additional or different license terms and conditions
for use, reproduction, or distribution of Your modifications, or
for any such Derivative Works as a whole, provided Your use,
reproduction, and distribution of the Work otherwise complies with
the conditions stated in this License.
5. Submission of Contributions. Unless You explicitly state otherwise,
any Contribution intentionally submitted for inclusion in the Work
by You to the Licensor shall be under the terms and conditions of
this License, without any additional terms or conditions.
Notwithstanding the above, nothing herein shall supersede or modify
the terms of any separate license agreement you may have executed
with Licensor regarding such Contributions.
6. Trademarks. This License does not grant permission to use the trade
names, trademarks, service marks, or product names of the Licensor,
except as required for reasonable and customary use in describing the
origin of the Work and reproducing the content of the NOTICE file.
7. Disclaimer of Warranty. Unless required by applicable law or
agreed to in writing, Licensor provides the Work (and each
Contributor provides its Contributions) on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied, including, without limitation, any warranties or conditions
of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
PARTICULAR PURPOSE. You are solely responsible for determining the
appropriateness of using or redistributing the Work and assume any
risks associated with Your exercise of permissions under this License.
8. Limitation of Liability. In no event and under no legal theory,
whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
liable to You for damages, including any direct, indirect, special,
incidental, or consequential damages of any character arising as a
result of this License or out of the use or inability to use the
Work (including but not limited to damages for loss of goodwill,
work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses), even if such Contributor
has been advised of the possibility of such damages.
9. Accepting Warranty or Additional Liability. While redistributing
the Work or Derivative Works thereof, You may choose to offer,
and charge a fee for, acceptance of support, warranty, indemnity,
or other liability obligations and/or rights consistent with this
License. However, in accepting such obligations, You may act only
on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
defend, and hold each Contributor harmless for any liability
incurred by, or claims asserted against, such Contributor by reason
of your accepting any such warranty or additional liability.
END OF TERMS AND CONDITIONS
APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
boilerplate notice, with the fields enclosed by brackets "[]"
replaced with your own identifying information. (Don't include
the brackets!) The text should be enclosed in the appropriate
comment syntax for the file format. We also recommend that a
file or class name and description of purpose be included on the
same "printed page" as the copyright notice for easier
identification within third-party archives.
Copyright [yyyy] [name of copyright owner]
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

23
backend-c/Makefile Normal file
View File

@ -0,0 +1,23 @@
TARGET = hello_world
CC = /opt/wasi-sdk/bin/clang
SYSROOT = /opt/wasi-sdk/share/wasi-sysroot
TARGET_TRIPLE = wasm32-unknown-wasi
CFLAGS = -nostartfiles -fvisibility=hidden
LDFLAGS = -Wl,--no-entry,--demangle,--allow-undefined
EXPORT_FUNCS = --export=allocate,--export=deallocate,--export=invoke
SDK = sdk/allocator.c sdk/logger.c
SRC = src/main.c src/model.c
LIBS = libs/tiny-json/tiny-json.c
.PHONY: default all clean
default: $(TARGET)
all: default
$(TARGET): $(SRC) $(SDK) $(LIBS)
$(CC) --sysroot=$(SYSROOT) --target=$(TARGET_TRIPLE) $(CFLAGS) $(LDFLAGS) -Wl,$(EXPORT_FUNCS) $^ -o $@.wasm
.PRECIOUS: $(TARGET)
clean:
-rm -f $(TARGET).wasm

16
backend-c/README.md Normal file
View File

@ -0,0 +1,16 @@
# Fluid
The twitter-like application for Fluence.
# How to build
This app could be built either with docker
```bash
docker-compose up
```
or by Makefile with [wasi-sdk](https://github.com/CraneStation/wasi-sdk) installed
```bash
make
```

7
backend-c/docker-compose.yml Normal file
View File

@ -0,0 +1,7 @@
version: '3'
services:
hello_world:
build:
context: .
volumes:
- .:/code

5
backend-c/libs/tiny-json/.travis.yml Normal file
View File

@ -0,0 +1,5 @@
language: c
sudo: false
script:
- cd test
- make test

463
backend-c/libs/tiny-json/tiny-json.c Normal file
View File

@ -0,0 +1,463 @@
/*
<https://github.com/rafagafe/tiny-json>
Licensed under the MIT License <http://opensource.org/licenses/MIT>.
SPDX-License-Identifier: MIT
Copyright (c) 2016-2018 Rafa Garcia <rafagarcia77@gmail.com>.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#include <string.h>
#include <ctype.h>
#include "tiny-json.h"
/** Structure to handle a heap of JSON properties. */
typedef struct jsonStaticPool_s {
json_t* const mem; /**< Pointer to array of json properties. */
unsigned int const qty; /**< Length of the array of json properties. */
unsigned int nextFree; /**< The index of the next free json property. */
jsonPool_t pool;
} jsonStaticPool_t;
/* Search a property by its name in a JSON object. */
json_t const* json_getProperty( json_t const* obj, char const* property ) {
json_t const* sibling;
for( sibling = obj->u.c.child; sibling; sibling = sibling->sibling )
if ( sibling->name && !strcmp( sibling->name, property ) )
return sibling;
return 0;
}
/* Search a property by its name in a JSON object and return its value. */
char const* json_getPropertyValue( json_t const* obj, char const* property ) {
json_t const* field = json_getProperty( obj, property );
if ( !field ) return 0;
jsonType_t type = json_getType( field );
if ( JSON_ARRAY >= type ) return 0;
return json_getValue( field );
}
/* Internal prototypes: */
static char* goBlank( char* str );
static char* goNum( char* str );
static json_t* poolInit( jsonPool_t* pool );
static json_t* poolAlloc( jsonPool_t* pool );
static char* objValue( char* ptr, json_t* obj, jsonPool_t* pool );
static char* setToNull( char* ch );
static bool isEndOfPrimitive( char ch );
/* Parse a string to get a json. */
json_t const* json_createWithPool( char *str, jsonPool_t *pool ) {
char* ptr = goBlank( str );
if ( !ptr || *ptr != '{' ) return 0;
json_t* obj = pool->init( pool );
obj->name = 0;
obj->sibling = 0;
obj->u.c.child = 0;
ptr = objValue( ptr, obj, pool );
if ( !ptr ) return 0;
return obj;
}
/* Parse a string to get a json. */
json_t const* json_create( char* str, json_t mem[], unsigned int qty ) {
jsonStaticPool_t spool = {
.mem = mem,
.qty = qty,
.pool = {
.init = poolInit,
.alloc = poolAlloc
}
};
return json_createWithPool( str, &spool.pool );
}
/** Get a special character with its escape character. Examples:
* 'b' -> '\b', 'n' -> '\n', 't' -> '\t'
* @param ch The escape character.
* @return The character code. */
static char getEscape( char ch ) {
static struct { char ch; char code; } const pair[] = {
{ '\"', '\"' }, { '\\', '\\' },
{ '/', '/' }, { 'b', '\b' },
{ 'f', '\f' }, { 'n', '\n' },
{ 'r', '\r' }, { 't', '\t' },
};
unsigned int i;
for( i = 0; i < sizeof pair / sizeof *pair; ++i )
if ( pair[i].ch == ch )
return pair[i].code;
return '\0';
}
/** Parse 4 characters.
* @Param str Pointer to first digit.
* @retval '?' If the four characters are hexadecimal digits.
* @retcal '\0' In other cases. */
static unsigned char getCharFromUnicode( unsigned char const* str ) {
unsigned int i;
for( i = 0; i < 4; ++i )
if ( !isxdigit( str[i] ) )
return '\0';
return '?';
}
/** Parse a string and replace the scape characters by their meaning characters.
* This parser stops when finds the character '\"'. Then replaces '\"' by '\0'.
* @param str Pointer to first character.
* @retval Pointer to first non white space after the string. If success.
* @retval Null pointer if any error occur. */
static char* parseString( char* str ) {
unsigned char* head = (unsigned char*)str;
unsigned char* tail = (unsigned char*)str;
for( ; *head >= ' '; ++head, ++tail ) {
if ( *head == '\"' ) {
*tail = '\0';
return (char*)++head;
}
if ( *head == '\\' ) {
if ( *++head == 'u' ) {
char const ch = getCharFromUnicode( ++head );
if ( ch == '\0' ) return 0;
*tail = ch;
head += 3;
}
else {
char const esc = getEscape( *head );
if ( esc == '\0' ) return 0;
*tail = esc;
}
}
else *tail = *head;
}
return 0;
}
/** Parse a string to get the name of a property.
* @param str Pointer to first character.
* @param property The property to assign the name.
* @retval Pointer to first of property value. If success.
* @retval Null pointer if any error occur. */
static char* propertyName( char* ptr, json_t* property ) {
property->name = ++ptr;
ptr = parseString( ptr );
if ( !ptr ) return 0;
ptr = goBlank( ptr );
if ( !ptr ) return 0;
if ( *ptr++ != ':' ) return 0;
return goBlank( ptr );
}
/** Parse a string to get the value of a property when its type is JSON_TEXT.
* @param str Pointer to first character ('\"').
* @param property The property to assign the name.
* @retval Pointer to first non white space after the string. If success.
* @retval Null pointer if any error occur. */
static char* textValue( char* ptr, json_t* property ) {
++property->u.value;
ptr = parseString( ++ptr );
if ( !ptr ) return 0;
property->type = JSON_TEXT;
return ptr;
}
/** Compare two strings until get the null character in the second one.
* @param ptr sub string
* @param str main string
* @retval Pointer to next character.
* @retval Null pointer if any error occur. */
static char* checkStr( char* ptr, char const* str ) {
while( *str )
if ( *ptr++ != *str++ )
return 0;
return ptr;
}
/** Parser a string to get a primitive value.
* If the first character after the value is different of '}' or ']' is set to '\0'.
* @param str Pointer to first character.
* @param property Property handler to set the value and the type, (true, false or null).
* @param value String with the primitive literal.
* @param type The code of the type. ( JSON_BOOLEAN or JSON_NULL )
* @retval Pointer to first non white space after the string. If success.
* @retval Null pointer if any error occur. */
static char* primitiveValue( char* ptr, json_t* property, char const* value, jsonType_t type ) {
ptr = checkStr( ptr, value );
if ( !ptr || !isEndOfPrimitive( *ptr ) ) return 0;
ptr = setToNull( ptr );
property->type = type;
return ptr;
}
/** Parser a string to get a true value.
* If the first character after the value is different of '}' or ']' is set to '\0'.
* @param str Pointer to first character.
* @param property Property handler to set the value and the type, (true, false or null).
* @retval Pointer to first non white space after the string. If success.
* @retval Null pointer if any error occur. */
static char* trueValue( char* ptr, json_t* property ) {
return primitiveValue( ptr, property, "true", JSON_BOOLEAN );
}
/** Parser a string to get a false value.
* If the first character after the value is different of '}' or ']' is set to '\0'.
* @param str Pointer to first character.
* @param property Property handler to set the value and the type, (true, false or null).
* @retval Pointer to first non white space after the string. If success.
* @retval Null pointer if any error occur. */
static char* falseValue( char* ptr, json_t* property ) {
return primitiveValue( ptr, property, "false", JSON_BOOLEAN );
}
/** Parser a string to get a null value.
* If the first character after the value is different of '}' or ']' is set to '\0'.
* @param str Pointer to first character.
* @param property Property handler to set the value and the type, (true, false or null).
* @retval Pointer to first non white space after the string. If success.
* @retval Null pointer if any error occur. */
static char* nullValue( char* ptr, json_t* property ) {
return primitiveValue( ptr, property, "null", JSON_NULL );
}
/** Analyze the exponential part of a real number.
* @param str Pointer to first character.
* @retval Pointer to first non numerical after the string. If success.
* @retval Null pointer if any error occur. */
static char* expValue( char* ptr ) {
if ( *ptr == '-' || *ptr == '+' ) ++ptr;
if ( !isdigit( *ptr ) ) return 0;
ptr = goNum( ++ptr );
return ptr;
}
/** Analyze the decimal part of a real number.
* @param str Pointer to first character.
* @retval Pointer to first non numerical after the string. If success.
* @retval Null pointer if any error occur. */
static char* fraqValue( char* ptr ) {
if ( !isdigit( *ptr ) ) return 0;
ptr = goNum( ++ptr );
if ( !ptr ) return 0;
return ptr;
}
/** Parser a string to get a numerical value.
* If the first character after the value is different of '}' or ']' is set to '\0'.
* @param str Pointer to first character.
* @param property Property handler to set the value and the type: JSON_REAL or JSON_INTEGER.
* @retval Pointer to first non white space after the string. If success.
* @retval Null pointer if any error occur. */
static char* numValue( char* ptr, json_t* property ) {
if ( *ptr == '-' ) ++ptr;
if ( !isdigit( *ptr ) ) return 0;
if ( *ptr != '0' ) {
ptr = goNum( ptr );
if ( !ptr ) return 0;
}
else if ( isdigit( *++ptr ) ) return 0;
property->type = JSON_INTEGER;
if ( *ptr == '.' ) {
ptr = fraqValue( ++ptr );
if ( !ptr ) return 0;
property->type = JSON_REAL;
}
if ( *ptr == 'e' || *ptr == 'E' ) {
ptr = expValue( ++ptr );
if ( !ptr ) return 0;
property->type = JSON_REAL;
}
if ( !isEndOfPrimitive( *ptr ) ) return 0;
if ( JSON_INTEGER == property->type ) {
char const* value = property->u.value;
bool const negative = *value == '-';
static char const min[] = "-9223372036854775808";
static char const max[] = "9223372036854775807";
unsigned int const maxdigits = ( negative? sizeof min: sizeof max ) - 1;
unsigned int const len = ptr - value;
if ( len > maxdigits ) return 0;
if ( len == maxdigits ) {
char const tmp = *ptr;
*ptr = '\0';
char const* const threshold = negative ? min: max;
if ( 0 > strcmp( threshold, value ) ) return 0;
*ptr = tmp;
}
}
ptr = setToNull( ptr );
return ptr;
}
/** Add a property to a JSON object or array.
* @param obj The handler of the JSON object or array.
* @param property The handler of the property to be added. */
static void add( json_t* obj, json_t* property ) {
property->sibling = 0;
if ( !obj->u.c.child ){
obj->u.c.child = property;
obj->u.c.last_child = property;
} else {
obj->u.c.last_child->sibling = property;
obj->u.c.last_child = property;
}
}
/** Parser a string to get a json object value.
* @param str Pointer to first character.
* @param pool The handler of a json pool for creating json instances.
* @retval Pointer to first character after the value. If success.
* @retval Null pointer if any error occur. */
static char* objValue( char* ptr, json_t* obj, jsonPool_t* pool ) {
obj->type = JSON_OBJ;
obj->u.c.child = 0;
obj->sibling = 0;
ptr++;
for(;;) {
ptr = goBlank( ptr );
if ( !ptr ) return 0;
if ( *ptr == ',' ) {
++ptr;
continue;
}
char const endchar = ( obj->type == JSON_OBJ )? '}': ']';
if ( *ptr == endchar ) {
*ptr = '\0';
json_t* parentObj = obj->sibling;
if ( !parentObj ) return ++ptr;
obj->sibling = 0;
obj = parentObj;
++ptr;
continue;
}
json_t* property = pool->alloc( pool );
if ( !property ) return 0;
if( obj->type != JSON_ARRAY ) {
if ( *ptr != '\"' ) return 0;
ptr = propertyName( ptr, property );
if ( !ptr ) return 0;
}
else property->name = 0;
add( obj, property );
property->u.value = ptr;
switch( *ptr ) {
case '{':
property->type = JSON_OBJ;
property->u.c.child = 0;
property->sibling = obj;
obj = property;
++ptr;
break;
case '[':
property->type = JSON_ARRAY;
property->u.c.child = 0;
property->sibling = obj;
obj = property;
++ptr;
break;
case '\"': ptr = textValue( ptr, property ); break;
case 't': ptr = trueValue( ptr, property ); break;
case 'f': ptr = falseValue( ptr, property ); break;
case 'n': ptr = nullValue( ptr, property ); break;
default: ptr = numValue( ptr, property ); break;
}
if ( !ptr ) return 0;
}
}
/** Initialize a json pool.
* @param pool The handler of the pool.
* @return a instance of a json. */
static json_t* poolInit( jsonPool_t* pool ) {
jsonStaticPool_t *spool = json_containerOf( pool, jsonStaticPool_t, pool );
spool->nextFree = 1;
return spool->mem;
}
/** Create an instance of a json from a pool.
* @param pool The handler of the pool.
* @retval The handler of the new instance if success.
* @retval Null pointer if the pool was empty. */
static json_t* poolAlloc( jsonPool_t* pool ) {
jsonStaticPool_t *spool = json_containerOf( pool, jsonStaticPool_t, pool );
if ( spool->nextFree >= spool->qty ) return 0;
return spool->mem + spool->nextFree++;
}
/** Checks whether an character belongs to set.
* @param ch Character value to be checked.
* @param set Set of characters. It is just a null-terminated string.
* @return true or false there is membership or not. */
static bool isOneOfThem( char ch, char const* set ) {
while( *set != '\0' )
if ( ch == *set++ )
return true;
return false;
}
/** Increases a pointer while it points to a character that belongs to a set.
* @param str The initial pointer value.
* @param set Set of characters. It is just a null-terminated string.
* @return The final pointer value or null pointer if the null character was found. */
static char* goWhile( char* str, char const* set ) {
for(; *str != '\0'; ++str ) {
if ( !isOneOfThem( *str, set ) )
return str;
}
return 0;
}
/** Set of characters that defines a blank. */
static char const* const blank = " \n\r\t\f";
/** Increases a pointer while it points to a white space character.
* @param str The initial pointer value.
* @return The final pointer value or null pointer if the null character was found. */
static char* goBlank( char* str ) {
return goWhile( str, blank );
}
/** Increases a pointer while it points to a decimal digit character.
* @param str The initial pointer value.
* @return The final pointer value or null pointer if the null character was found. */
static char* goNum( char* str ) {
for( ; *str != '\0'; ++str ) {
if ( !isdigit( *str ) )
return str;
}
return 0;
}
/** Set of characters that defines the end of an array or a JSON object. */
static char const* const endofblock = "}]";
/** Set a char to '\0' and increase its pointer if the char is different to '}' or ']'.
* @param ch Pointer to character.
* @return Final value pointer. */
static char* setToNull( char* ch ) {
if ( !isOneOfThem( *ch, endofblock ) ) *ch++ = '\0';
return ch;
}
/** Indicate if a character is the end of a primitive value. */
static bool isEndOfPrimitive( char ch ) {
return ch == ',' || isOneOfThem( ch, blank ) || isOneOfThem( ch, endofblock );
}

176
backend-c/libs/tiny-json/tiny-json.h Normal file
View File

@ -0,0 +1,176 @@
/*
<https://github.com/rafagafe/tiny-json>
Licensed under the MIT License <http://opensource.org/licenses/MIT>.
SPDX-License-Identifier: MIT
Copyright (c) 2016-2018 Rafa Garcia <rafagarcia77@gmail.com>.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#ifndef _TINY_JSON_H_
#define _TINY_JSON_H_
#ifdef __cplusplus
extern "C" {
#endif
#include <stddef.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdint.h>
#define json_containerOf( ptr, type, member ) \
((type*)( (char*)ptr - offsetof( type, member ) ))
/** @defgroup tinyJson Tiny JSON parser.
* @{ */
/** Enumeration of codes of supported JSON properties types. */
typedef enum {
JSON_OBJ, JSON_ARRAY, JSON_TEXT, JSON_BOOLEAN,
JSON_INTEGER, JSON_REAL, JSON_NULL
} jsonType_t;
/** Structure to handle JSON properties. */
typedef struct json_s {
struct json_s* sibling;
char const* name;
union {
char const* value;
struct {
struct json_s* child;
struct json_s* last_child;
} c;
} u;
jsonType_t type;
} json_t;
/** Parse a string to get a json.
* @param str String pointer with a JSON object. It will be modified.
* @param mem Array of json properties to allocate.
* @param qty Number of elements of mem.
* @retval Null pointer if any was wrong in the parse process.
* @retval If the parser process was successfully a valid handler of a json.
* This property is always unnamed and its type is JSON_OBJ. */
json_t const* json_create( char* str, json_t mem[], unsigned int qty );
/** Get the name of a json property.
* @param json A valid handler of a json property.
* @retval Pointer to null-terminated if property has name.
* @retval Null pointer if the property is unnamed. */
static inline char const* json_getName( json_t const* json ) {
return json->name;
}
/** Get the value of a json property.
* The type of property cannot be JSON_OBJ or JSON_ARRAY.
* @param json A valid handler of a json property.
* @return Pointer to null-terminated string with the value. */
static inline char const* json_getValue( json_t const* property ) {
return property->u.value;
}
/** Get the type of a json property.
* @param json A valid handler of a json property.
* @return The code of type.*/
static inline jsonType_t json_getType( json_t const* json ) {
return json->type;
}
/** Get the next sibling of a JSON property that is within a JSON object or array.
* @param json A valid handler of a json property.
* @retval The handler of the next sibling if found.
* @retval Null pointer if the json property is the last one. */
static inline json_t const* json_getSibling( json_t const* json ) {
return json->sibling;
}
/** Search a property by its name in a JSON object.
* @param obj A valid handler of a json object. Its type must be JSON_OBJ.
* @param property The name of property to get.
* @retval The handler of the json property if found.
* @retval Null pointer if not found. */
json_t const* json_getProperty( json_t const* obj, char const* property );
/** Search a property by its name in a JSON object and return its value.
* @param obj A valid handler of a json object. Its type must be JSON_OBJ.
* @param property The name of property to get.
* @retval If found a pointer to null-terminated string with the value.
* @retval Null pointer if not found or it is an array or an object. */
char const* json_getPropertyValue( json_t const* obj, char const* property );
/** Get the first property of a JSON object or array.
* @param json A valid handler of a json property.
* Its type must be JSON_OBJ or JSON_ARRAY.
* @retval The handler of the first property if there is.
* @retval Null pointer if the json object has not properties. */
static inline json_t const* json_getChild( json_t const* json ) {
return json->u.c.child;
}
/** Get the value of a json boolean property.
* @param property A valid handler of a json object. Its type must be JSON_BOOLEAN.
* @return The value stdbool. */
static inline bool json_getBoolean( json_t const* property ) {
return *property->u.value == 't';
}
/** Get the value of a json integer property.
* @param property A valid handler of a json object. Its type must be JSON_INTEGER.
* @return The value stdint. */
static inline int64_t json_getInteger( json_t const* property ) {
return atoll( property->u.value );
}
/** Get the value of a json real property.
* @param property A valid handler of a json object. Its type must be JSON_REAL.
* @return The value. */
static inline double json_getReal( json_t const* property ) {
return atof( property->u.value );
}
/** Structure to handle a heap of JSON properties. */
typedef struct jsonPool_s jsonPool_t;
struct jsonPool_s {
json_t* (*init)( jsonPool_t* pool );
json_t* (*alloc)( jsonPool_t* pool );
};
/** Parse a string to get a json.
* @param str String pointer with a JSON object. It will be modified.
* @param pool Custom json pool pointer.
* @retval Null pointer if any was wrong in the parse process.
* @retval If the parser process was successfully a valid handler of a json.
* This property is always unnamed and its type is JSON_OBJ. */
json_t const* json_createWithPool( char* str, jsonPool_t* pool );
/** @ } */
#ifdef __cplusplus
}
#endif
#endif /* _TINY_JSON_H_ */

13
backend-c/sdk/allocator.c Normal file
View File

@ -0,0 +1,13 @@
#include "allocator.h"
#include <stdlib.h>
#define UNUSED(x) (void)(x)
void *allocate(size_t size) {
return malloc(size);
}
void deallocate(void *ptr, size_t size) {
UNUSED(size);
free(ptr);
}

27
backend-c/sdk/allocator.h Normal file
View File

@ -0,0 +1,27 @@
#ifndef FLUENCE_C_SDK_ALLOCATOR_H
#define FLUENCE_C_SDK_ALLOCATOR_H
#include <stddef.h> // for size_t
/**
* Allocates a memory region of a given size.
*
* Used by Wasm VM for byte array passing. Should be exported from module.
*
* @param size a size of allocated memory region.
* @return a pointer to the allocated memory region.
*/
void *allocate(size_t size);
/**
* Frees a memory region.
*
* Used by Wasm VM for freeing previous memory allocated by `allocate` function.
* Should be exported from module.
*
* @param ptr a pointer to the previously allocated memory region.
* @param size a size of the previously allocated memory region.
*/
void deallocate(void *ptr, size_t size);
#endif //FLUENCE_C_SDK_ALLOCATOR_H

15
backend-c/sdk/logger.c Normal file
View File

@ -0,0 +1,15 @@
#include "logger.h"
#define __LOGGER_IMPORT(name) \
__attribute__((__import_module__("logger"), __import_name__(#name)))
void __write(char ch) __LOGGER_IMPORT(write);
void __flush() __LOGGER_IMPORT(flush);
void wasm_log(const char *str, int len) {
for(int byteId = 0; byteId < len; ++byteId) {
__write(str[byteId]);
}
__flush();
}

12
backend-c/sdk/logger.h Normal file
View File

@ -0,0 +1,12 @@
#ifndef FLUENCE_C_SDK_LOGGER_H
#define FLUENCE_C_SDK_LOGGER_H
/**
* Writes provided string to Wasm VM logger.
*
* @param str a pointer to a message that should be logged.
* @param len a size of a message that should be logged.
*/
void wasm_log(const char *str, int len);
#endif //FLUENCE_C_SDK_LOGGER_H

61
backend-c/sdk/side_module_api.h Normal file
View File

@ -0,0 +1,61 @@
#ifndef C_TEMPLATE_SIDE_MODULE_API_H
#define C_TEMPLATE_SIDE_MODULE_API_H
//#include <string.h>
/*
* Concatenate preprocessor tokens A and B without expanding macro definitions
* (however, if invoked from a macro, macro arguments are expanded).
*/
#define PPCAT_NX(A, B) A ## B
/*
* Concatenate preprocessor tokens A and B after macro-expanding them.
*/
#define PPCAT(A, B) PPCAT_NX(A, B)
/*
* Turn A into a string literal without expanding macro definitions
* (however, if invoked from a macro, macro arguments are expanded).
*/
#define STRINGIZE_NX(A) #A
/*
* Turn A into a string literal after macro-expanding it.
*/
#define STRINGIZE(A) STRINGIZE_NX(A)
#define __MODULE_IMPORT(module_name) \
void module_name ## _store(char *ptr, char byte) __attribute__((__import_module__(#module_name), __import_name__(STRINGIZE(PPCAT(module_name, _store))))); \
unsigned char module_name ## _load(char *ptr) __attribute__((__import_module__(#module_name), __import_name__(STRINGIZE(PPCAT(module_name, _load))))); \
char* module_name ## _allocate(unsigned int size) __attribute__((__import_module__(#module_name), __import_name__(STRINGIZE(PPCAT(module_name, _allocate))))); \
void module_name ## _deallocate(char *ptr, unsigned int size) __attribute__((__import_module__(#module_name), __import_name__(STRINGIZE(PPCAT(module_name, _deallocate))))); \
char* module_name ## _invoke(char *ptr, int size) __attribute__((__import_module__(#module_name), __import_name__(STRINGIZE(PPCAT(module_name, _invoke))))); \
\
char * module_name ## _call(const char *ptr, int length) { \
char *request_ptr = module_name ## _allocate(length); \
\
for(int i = 0; i < length; ++i) { \
module_name ## _store(request_ptr + i, ptr[i]); \
} \
char *result = module_name ## _invoke(request_ptr, length); \
\
unsigned int result_size = 0; \
for (int i = 0; i < 4; ++i) { \
result_size = result_size | ((unsigned int)result[i] << 8*i); \
} \
\
char *result_out = malloc(result_size + 1); \
for(int i = 0; i < result_size; ++i) { \
result_out[i] = module_name ## _load(result + 4 + i); \
}\
\
result_out[result_size] = '\0'; \
\
module_name ## _deallocate(result, result_size); \
\
return result_out;\
}
#endif //C_TEMPLATE_SIDE_MODULE_API_H

143
backend-c/src/main.c Normal file
View File

@ -0,0 +1,143 @@
#include "../sdk/allocator.h"
#include "../sdk/logger.h"
#include "model.h"
#include "../libs/tiny-json/tiny-json.h"
//#include <string.h>
char *prepare_response(const char *response, int response_length) {
const int RESPONSE_SIZE_BYTES = 4;
char *result = (char *)allocate(response_length + RESPONSE_SIZE_BYTES);
for(int i = 0; i < RESPONSE_SIZE_BYTES; ++i) {
result[i] = (response_length >> 8*i) & 0xFF;
}
memcpy(result + RESPONSE_SIZE_BYTES, response, response_length);
return result;
}
const char *add_post_request(const json_t *json);
const char *fetch_posts_request(const json_t *json);
char *invoke(char *str, int length) {
wasm_log(str, length);
json_t pool[10];
const unsigned int pool_size = sizeof pool / sizeof *pool;
const json_t *json = json_create(str, pool, pool_size);
if(!json) {
const char error[] = "Mailformed json given";
return prepare_response(error, sizeof error);
}
json_t const *action_json = json_getProperty(json, "action");
if(0 == action_json) {
const char error[] = "Given json doesn't contain action field";
return prepare_response(error, sizeof error);
}
if(JSON_TEXT != json_getType(action_json)) {
const char error[] = "action field is mailformed";
return prepare_response(error, sizeof error);
}
const char *action = json_getValue(action_json);
const char *result = "";
if(0 == strcmp(action, "Post")) {
result = add_post_request(json);
} else if(0 == strcmp(action, "Fetch")) {
result = fetch_posts_request(json);
} else {
char *error = (char *)malloc(1024);
const int error_size = snprintf(error, 1024, "%s given as the action field, but only `Post` and `Fetch` are supported");
result = prepare_response(error, error_size);
}
return result;
}
const char *add_post_request(const json_t *json) {
const json_t *message_json = json_getProperty(json, "message");
const json_t *username_json = json_getProperty(json, "username");
if(0 == message_json || 0 == username_json) {
const char error[] = "Given json doesn't contain message or username field";
return prepare_response(error, sizeof error);
}
if(JSON_TEXT != json_getType(message_json) || JSON_TEXT != json_getType(username_json)) {
const char error[] = "message or action fields are mailformed";
return prepare_response(error, sizeof error);
}
const char *message = json_getValue(message_json);
const char *username = json_getValue(username_json);
const char *add_post_result = add_post(message, strlen(message),
username, strlen(username));
if(0 == add_post_result) {
const char error[] = "add_post failed";
return prepare_response(error, sizeof error);
}
const char *count = get_posts_count();
if(0 == count) {
const char error[] = "get_posts_count failed";
return prepare_response(error, sizeof error);
}
char result[256];
const int result_len = snprintf(result, 256, "{ count: \"%s\" }", count);
return prepare_response(result, result_len);
}
const char *fetch_posts_request(const json_t *json) {
const json_t *username_json = json_getProperty(json, "username");
const json_t *offset_json = json_getProperty(json, "offset");
const json_t *count_json = json_getProperty(json, "count");
if((0 != username_json && JSON_TEXT != json_getType(username_json)) ||
(0 != offset_json && JSON_INTEGER != json_getType(offset_json)) ||
(0 != count_json && JSON_INTEGER != json_getType(count_json))
) {
const char error[] = "json fields are mailformed";
return prepare_response(error, sizeof(error));
}
int count = 100;
if(0 != count_json) {
count = json_getInteger(count_json);
}
int offset = 0;
if(0 != offset_json) {
offset = json_getInteger(offset_json);
}
char *result = "";
if(0 == username_json) {
result = get_all_posts(offset, count);
if(0 == result) {
const char error[] = "get_all_posts failed";
return prepare_response(error, sizeof(error));
}
} else {
const char *username = json_getValue(username_json);
result = get_posts_by_username(username, strlen(username), offset, count);
if(0 == result) {
const char error[] = "get_posts_by_username failed";
return prepare_response(error, sizeof(error));
}
}
const int result_len = strlen(result) + 100;
char *result_out = malloc(result_len);
const int result_out_len = snprintf(result_out, result_len, "{ posts: \"%s\" }", result);
return prepare_response(result_out, result_out_len);
}

67
backend-c/src/model.c Normal file
View File

@ -0,0 +1,67 @@
#include "../sdk/side_module_api.h"
//#include <string.h>
//#include <stdlib.h>
__MODULE_IMPORT(sqlite)
int snprintf ( char * s, int n, const char * format, ... );
// TODO: introduce error codes and security checks
void create_scheme() {
const char create_sql[] = "CREATE TABLE messages(message text, username text)";
sqlite_call(create_sql, sizeof(create_sql));
}
char *add_post(const char *message, int message_length, const char *username, int username_length) {
// at now wasm-ld has 1024 bytes for stack permission by default - that why dynamic allocation here
const int request_size = message_length + username_length + 50;
char *add_sql = (char *)malloc(request_size);
const int add_sql_length = snprintf(add_sql, request_size, "INSERT INTO messages VALUES(%s, %s)", message, username);
if(add_sql_length < 0) {
return 0;
}
return sqlite_call(add_sql, add_sql_length);
}
char *get_all_posts(int offset, int count) {
// at now wasm-ld has 1024 bytes for stack permission by default - that why dynamic allocation here
char *get_sql = (char *)malloc(256);
const int get_sql_length = snprintf(get_sql, 256,
"SELECT json_group_array(\n"
" json_object('message', message, 'username', username)\n"
" ) AS json_result FROM (\n"
" SELECT * FROM messages LIMIT %d OFFSET %d\n"
" )", count, offset);
if(get_sql_length < 0) {
return 0;
}
return sqlite_call(get_sql, get_sql_length);
}
char *get_posts_by_username(const char *username, int username_length, int offset, int count) {
// at now wasm-ld has 1024 bytes for stack permission by default - that why dynamic allocation here
const int request_size = username_length + 300;
char *get_sql = (char *)malloc(request_size);
const int add_sql_length = snprintf(get_sql, request_size,
"\"SELECT json_group_array(\n"
" json_object('message', message, 'username', username)\n"
" ) AS json_result FROM (\n"
" SELECT * FROM messages where username = '%s' LIMIT %d OFFSET %d\n"
" )",
username, count, offset);
if(add_sql_length < 0) {
return 0;
}
return sqlite_call(get_sql, add_sql_length);
}
char *get_posts_count() {
const char count_sql[] = "SELECT COUNT(*) from messages";
return sqlite_call(count_sql, sizeof(count_sql));
}

14
backend-c/src/model.h Normal file
View File

@ -0,0 +1,14 @@
#ifndef FLUID_MODEL_H
#define FLUID_MODEL_H
void create_scheme();
char *add_post(const char *message, int message_length, const char *username, int username_length);
char *get_all_posts(int offset, int count);
char *get_posts_by_username(const char *username, int username_length, int offset, int count);
char *get_posts_count();
#endif //FLUID_MODEL_H