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Merge pull request #4 from fluencelabs/backend_c

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add backend example on C
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vms 2019-08-20 16:34:41 +02:00 committed by GitHub
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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

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Apache License
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TARGET = fluid
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

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# 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
```

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version: '3'
services:
hello_world:
build:
context: .
volumes:
- .:/code

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language: c
sudo: false
script:
- cd test
- make test

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backend-c/libs/tiny-json/tiny-json.c Normal file
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/*
<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 );
}

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/*
<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_ */

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#!/usr/bin/env bash
set -e
set -o pipefail
mkdir -p wasm
# Download SQLite
SQLITE="sqlite3_0.2.0.wasm"
if [ ! -f "wasm/$SQLITE" ]; then
echo "Downloading $SQLITE..."
wget -q https://github.com/fluencelabs/sqlite/releases/download/v0.2.0_w/$SQLITE -O ./wasm/$SQLITE
fi
# Build fluid WASM module
echo "Building to WASM..."
docker-compose up --build
cp fluid.wasm wasm/
echo
# Run it all on 30000 port with default Fluence API
echo "Running..."
docker rm -f frun &>/dev/null || true
echo 'docker run -d --name frun --rm -v "$(pwd)/wasm:/code" -p 30000:30000 fluencelabs/frun:latest'
docker run -d --name frun --rm -v "$(pwd)/wasm:/code" -p 30000:30000 fluencelabs/frun:latest >/dev/null
echo
# Wait for app to be initialized
sleep 1 && (docker logs -f frun 2>&1 &) | grep -q initialized && sleep 1
############################################
### *** --- === Sending post === --- *** ###
############################################
# Assign json to a variable using heredoc technique
JSON=$(cat <<JSON
{"action":"Post","message":"I'm nice, you're nice, it's nice!","username":"random_joe"}
JSON
)
echo -e "Sending post: $JSON"
# Send json as a request, and receive result
RESPONSE=$(curl -s 'http://localhost:30000/apps/0/tx' --data $'sessionId/0\n'"$JSON" --compressed)
RESPONSE=$(echo "$RESPONSE" | jq -r .result.data | base64 --decode 2>/dev/null || echo "$RESPONSE")
# Parse json or print response as is
echo "$RESPONSE" | jq . 2>/dev/null || echo "$RESPONSE"
##############################################
### *** --- === Fetching posts === --- *** ###
##############################################
# Assign json to a variable using heredoc technique
JSON=$(cat <<JSON
{"action":"Fetch", "handle": "random_joe", "offset": 0, "count": 10}
JSON
)
echo -e "Fetching posts: $JSON"
# Send json as a request, and receive result
RESPONSE=$(curl -s 'http://localhost:30000/apps/0/tx' --data $'sessionId/1\n'"$JSON" --compressed)
RESPONSE=$(echo "$RESPONSE" | jq -r .result.data | base64 --decode 2>/dev/null || echo "$RESPONSE")
# Parse json or print response as is
echo "$RESPONSE" | jq . 2>/dev/null || echo "$RESPONSE"
# Remove frun container
echo -e "Stopping..."
docker rm -f frun >/dev/null

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#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);
}

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#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

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#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();
}

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#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

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#ifndef C_TEMPLATE_SIDE_MODULE_API_H
#define C_TEMPLATE_SIDE_MODULE_API_H
#include <string.h>
#include <stdlib.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 | (module_name ## _load(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

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#include <stdio.h>
size_t __stdio_write(FILE *f, const unsigned char *buf, size_t len) {
return 1;
}
int __stdio_close(FILE *f) {
return 1;
}
off_t __stdio_seek(FILE *_f, off_t _offset, int _value) {
return 1;
}

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#include "model.h"
#include "../sdk/allocator.h"
#include "../sdk/logger.h"
#include "../sdk/syscalls_stubs.c"
#include "../libs/tiny-json/tiny-json.h"
#include <string.h>
#include <stdlib.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);
bool isInited = 0;
const char *invoke(char *str, int length) {
// initialize SQLite by creating schema
if(0 == isInited) {
create_scheme();
isInited = 1;
}
json_t pool[10];
const unsigned int pool_size = sizeof pool / sizeof *pool;
// try to parse json and extract action field
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);
// use action to determine the desired activity
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 {
// no suitable action given
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", action);
result = prepare_response(error, error_size);
}
return result;
}
const char *add_post_request(const json_t *json) {
// try to extract username and message properties
const json_t *username_json = json_getProperty(json, "username");
const json_t *message_json = json_getProperty(json, "message");
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 *username = json_getValue(username_json);
const char *message = json_getValue(message_json);
const char *add_post_result = add_post(username, strlen(username),
message, strlen(message));
if(0 == add_post_result) {
const char error[] = "add_post failed";
return prepare_response(error, sizeof error);
}
// returns the updated post count to the client
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) {
// try to extract username, offset and count fields
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) {
// if no username specified, jsut return all posts
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);
}

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#include "../sdk/side_module_api.h"
#include "../sdk/logger.h"
#include <stdlib.h>
#include <stdio.h>
__MODULE_IMPORT(sqlite)
// 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 *username, int username_length, const char *message, int message_length) {
// at now wasm-ld has 1024 bytes for stack permission by default - that why dynamic allocation here
const int request_size = username_length + message_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("
" json_object('message', message, 'username', username)"
" ) AS json_result FROM ("
" SELECT * FROM messages LIMIT %d OFFSET %d"
" )", 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("
" json_object('message', message, 'username', username)"
" ) AS json_result FROM ("
" SELECT * FROM messages where username = '%s' LIMIT %d OFFSET %d"
" )",
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));
}

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#ifndef FLUID_MODEL_H
#define FLUID_MODEL_H
void create_scheme();
char *add_post(const char *username, int username_length, const char *message, int message_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