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Refactor ChangeProcessor loop to get rid of panics

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This commit is contained in:
Lucien Greathouse
2020-03-21 17:47:25 -07:00
parent cf0ff60d31
commit 330c92c9a8
1 changed files with 49 additions and 39 deletions
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88
src/change_processor.rs
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@@ -272,12 +272,11 @@ fn compute_and_apply_changes(tree: &mut RojoTree, vfs: &Vfs, id: RbxId) -> Optio
let instigating_source = match &metadata.instigating_source {
Some(path) => path,
None => {
log::warn!(
log::error!(
"Instance {} did not have an instigating source, but was considered for an update.",
id
);
log::warn!("This is a Rojo bug. Please file an issue!");
log::error!("This is a bug. Please file an issue!");
return None;
}
};
@@ -285,43 +284,49 @@ fn compute_and_apply_changes(tree: &mut RojoTree, vfs: &Vfs, id: RbxId) -> Optio
// How we process a file change event depends on what created this
// file/folder in the first place.
let applied_patch_set = match instigating_source {
InstigatingSource::Path(path) => {
let maybe_meta = vfs.metadata(path).with_not_found().unwrap();
InstigatingSource::Path(path) => match vfs.metadata(path).with_not_found() {
Ok(Some(_)) => {
// Our instance was previously created from a path and that
// path still exists. We can generate a snapshot starting at
// that path and use it as the source for our patch.
match maybe_meta {
Some(_meta) => {
// Our instance was previously created from a path and
// that path still exists. We can generate a snapshot
// starting at that path and use it as the source for
// our patch.
let snapshot = match snapshot_from_vfs(&metadata.context, &vfs, &path) {
Ok(Some(snapshot)) => snapshot,
Ok(None) => {
log::error!(
"Snapshot did not return an instance from path {}",
path.display()
);
log::error!("This may be a bug!");
return None;
}
Err(err) => {
log::error!("Snapshot error: {}", ErrorDisplay(err));
return None;
}
};
let snapshot = match snapshot_from_vfs(&metadata.context, &vfs, &path) {
Ok(maybe_snapshot) => {
maybe_snapshot.expect("snapshot did not return an instance")
}
Err(err) => {
log::error!("Snapshot error: {}", ErrorDisplay(err));
return None;
}
};
let patch_set = compute_patch_set(&snapshot, &tree, id);
apply_patch_set(tree, patch_set)
}
None => {
// Our instance was previously created from a path, but
// that path no longer exists.
//
// We associate deleting the instigating file for an
// instance with deleting that instance.
let mut patch_set = PatchSet::new();
patch_set.removed_instances.push(id);
apply_patch_set(tree, patch_set)
}
let patch_set = compute_patch_set(&snapshot, &tree, id);
apply_patch_set(tree, patch_set)
}
}
Ok(None) => {
// Our instance was previously created from a path, but that
// path no longer exists.
//
// We associate deleting the instigating file for an
// instance with deleting that instance.
let mut patch_set = PatchSet::new();
patch_set.removed_instances.push(id);
apply_patch_set(tree, patch_set)
}
Err(err) => {
log::error!("Error processing filesystem change: {}", ErrorDisplay(err));
return None;
}
},
InstigatingSource::ProjectNode(project_path, instance_name, project_node) => {
// This instance is the direct subject of a project node. Since
// there might be information associated with our instance from
@@ -336,9 +341,14 @@ fn compute_and_apply_changes(tree: &mut RojoTree, vfs: &Vfs, id: RbxId) -> Optio
);
let snapshot = match snapshot_result {
Ok(maybe_snapshot) => maybe_snapshot.expect("snapshot did not return an instance"),
Ok(Some(snapshot)) => snapshot,
Ok(None) => {
log::error!("Snapshot did not return an instance from a project node.");
log::error!("This is a bug!");
return None;
}
Err(err) => {
log::error!("Snapshot error: {}", ErrorDisplay(err));
log::error!("{}", ErrorDisplay(err));
return None;
}
};