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use cid::Cid;
use crate::peer_task_queue::Task;
/// Extra data associated with each task in the request queue.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct TaskData {
/// Tasks can be either want-have or want-block.
pub is_want_block: bool,
/// Wether to immediately send a response if teh block is not found.
pub send_dont_have: bool,
/// The size of the block corresponding to the task.
pub block_size: usize,
/// Wether the block was found.
pub have_block: bool,
}
#[derive(Default, Debug, Clone, PartialEq, Eq)]
pub struct TaskMerger {}
impl crate::peer_task_queue::TaskMerger<Cid, TaskData> for TaskMerger {
fn has_new_info(&self, task: &Task<Cid, TaskData>, existing: &[Task<Cid, TaskData>]) -> bool {
let mut have_size = false;
let mut is_want_block = false;
for entry in existing {
if entry.data.have_block {
have_size = true;
}
if entry.data.is_want_block {
is_want_block = true;
}
}
// If there is no active want-block and the new task is a want-block
// the new task is better.
let new_task_data = &task.data;
if !is_want_block && new_task_data.is_want_block {
return true;
}
// If there is no size information for the Cid and the new taks has size
// information, the new task is better.
if !have_size && new_task_data.have_block {
return true;
}
false
}
fn merge(&self, task: &Task<Cid, TaskData>, existing: &mut Task<Cid, TaskData>) {
let new_task = &task.data;
let existing_task = &mut existing.data;
// If we now have block size information, update the task with the new block size.
if !existing_task.have_block && new_task.have_block {
existing_task.have_block = new_task.have_block;
existing_task.block_size = new_task.block_size;
}
// If replacing a want-ahve with a want-block
if !existing_task.is_want_block && new_task.is_want_block {
// Change the type form want-have to want-block.
existing_task.is_want_block = true;
// If the want-have was a DONT_HAVAE, or the want-block has a size
if !existing_task.have_block || new_task.have_block {
// Update the entry size
existing_task.have_block = new_task.have_block;
existing.work = task.work;
}
}
// If the task is a want-block, make sure the entry size is equal to the block size
// (because we will send the whole block)
if existing_task.is_want_block && existing_task.have_block {
existing.work = existing_task.block_size;
}
}
}