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lib.rs
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lib.rs
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#![allow(non_snake_case)]
use ic_cdk::{
export::{
candid::{CandidType, Deserialize},
Principal,
},
query, update
};
use std::cell::RefCell;
use std::collections::BTreeMap;
#[derive(Clone, Debug, CandidType, Deserialize)]
enum Content {
Text(String),
Image(Vec<u8>),
Video(Vec<u8>)
}
#[derive(Clone, Debug, CandidType, Deserialize)]
struct Message {
content: Content,
vote: i128,
creator: Principal
}
thread_local! {
static MESSAGE_ID: RefCell<u128> = RefCell::new(0);
static WALL: RefCell<BTreeMap<u128, Message>> = RefCell::new(BTreeMap::new());
}
#[update]
fn writeMessage(content: Content) -> u128 {
MESSAGE_ID.with(|message_id| {
let message = Message {
creator: ic_cdk::api::caller(),
vote: 0,
content
};
let mut id = message_id.borrow_mut();
WALL.with(|wall| {
wall.borrow_mut().insert(*id, message);
});
*id += 1;
*id - 1
})
}
#[query]
fn getMessage(messageId: u128) -> Result<Message, String> {
WALL.with(|wall| {
match wall.borrow().get(&messageId) {
Some(message) => Ok(message.clone()),
None => Err(format!("Message not found: {}", messageId))
}
})
}
#[update]
fn updateMessage(messageId: u128, content: Content) -> Result<(), String> {
WALL.with(|wall| {
let mut w = wall.borrow_mut();
match w.get_mut(&messageId) {
Some(message) => {
let caller = &ic_cdk::api::caller();
if message.creator.eq(&caller) {
message.content = content;
Ok(())
} else {
Err(String::from("Not owner"))
}
},
None => {
Err(format!("Message not found: {}", messageId))
}
}
})
}
#[update]
fn deleteMessage(messageId : u128) -> Result<(), String> {
WALL.with(|wall| {
match wall.borrow_mut().remove(&messageId) {
Some(_) => Ok(()),
None => Err(format!("Message not found: {}", messageId))
}
})
}
#[update]
fn upVote(messageId: u128) -> Result<(), String> {
WALL.with(|wall| {
let mut w = wall.borrow_mut();
match w.get_mut(&messageId) {
Some(message) => {
message.vote += 1;
Ok(())
},
None => {
Err(format!("Message not found: {}", messageId))
}
}
})
}
#[update]
fn downVote(messageId: u128) -> Result<(), String> {
WALL.with(|wall| {
let mut w = wall.borrow_mut();
match w.get_mut(&messageId) {
Some(message) => {
message.vote -= 1;
Ok(())
},
None => {
Err(format!("Message not found: {}", messageId))
}
}
})
}
#[query]
fn getAllMessages() -> Vec<Message> {
WALL.with(|wall| {
wall.borrow().values().cloned().collect()
})
}
#[query]
fn getAllMessagesRanked() -> Vec<Message> {
WALL.with(|wall| {
let mut values: Vec<Message> = wall.borrow().values().cloned().collect();
// values.sort_by(|a, b| b.vote.cmp(&a.vote)); // Decending order
values.sort_by(|a, b|
if a.vote == b.vote {
std::cmp::Ordering::Equal
} else if a.vote > b.vote {
std::cmp::Ordering::Less
} else {
std::cmp::Ordering::Greater
});
values
})
}