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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const { assert, reportException } = require("devtools/shared/DevToolsUtils");
const {
actions,
diffingState,
viewState,
} = require("devtools/client/memory/constants");
const {
getSnapshot,
censusIsUpToDate,
snapshotIsDiffable,
findSelectedSnapshot,
} = require("devtools/client/memory/utils");
/**
* Toggle diffing mode on or off.
*/
exports.toggleDiffing = function() {
return function({ dispatch, getState }) {
dispatch({
type: actions.CHANGE_VIEW,
newViewState: getState().diffing ? viewState.CENSUS : viewState.DIFFING,
oldDiffing: getState().diffing,
oldSelected: findSelectedSnapshot(getState()),
});
};
};
/**
* Select the given snapshot for diffing.
*
* @param {snapshotModel} snapshot
*/
const selectSnapshotForDiffing = (exports.selectSnapshotForDiffing = function(
snapshot
) {
assert(
snapshotIsDiffable(snapshot),
"To select a snapshot for diffing, it must be diffable"
);
return { type: actions.SELECT_SNAPSHOT_FOR_DIFFING, snapshot };
});
/**
* Compute the difference between the first and second snapshots.
*
* @param {HeapAnalysesClient} heapWorker
* @param {snapshotModel} first
* @param {snapshotModel} second
*/
const takeCensusDiff = (exports.takeCensusDiff = function(
heapWorker,
first,
second
) {
return async function({ dispatch, getState }) {
assert(
snapshotIsDiffable(first),
`First snapshot must be in a diffable state, found ${first.state}`
);
assert(
snapshotIsDiffable(second),
`Second snapshot must be in a diffable state, found ${second.state}`
);
let report, parentMap;
let display = getState().censusDisplay;
let filter = getState().filter;
if (censusIsUpToDate(filter, display, getState().diffing.census)) {
return;
}
do {
if (
!getState().diffing ||
getState().diffing.firstSnapshotId !== first.id ||
getState().diffing.secondSnapshotId !== second.id
) {
// If we stopped diffing or stopped and then started diffing a different
// pair of snapshots, then just give up with diffing this pair. In the
// latter case, a newly spawned task will handle the diffing for the new
// pair.
return;
}
display = getState().censusDisplay;
filter = getState().filter;
dispatch({
type: actions.TAKE_CENSUS_DIFF_START,
first,
second,
filter,
display,
});
const opts = display.inverted
? { asInvertedTreeNode: true }
: { asTreeNode: true };
opts.filter = filter || null;
try {
({ delta: report, parentMap } = await heapWorker.takeCensusDiff(
first.path,
second.path,
{ breakdown: display.breakdown },
opts
));
} catch (error) {
reportException("actions/diffing/takeCensusDiff", error);
dispatch({ type: actions.DIFFING_ERROR, error });
return;
}
} while (
filter !== getState().filter ||
display !== getState().censusDisplay
);
dispatch({
type: actions.TAKE_CENSUS_DIFF_END,
first,
second,
report,
parentMap,
filter,
display,
});
};
});
/**
* Ensure that the current diffing data is up to date with the currently
* selected display, filter, etc. If the state is not up-to-date, then a
* recompute is triggered.
*
* @param {HeapAnalysesClient} heapWorker
*/
const refreshDiffing = (exports.refreshDiffing = function(heapWorker) {
return function({ dispatch, getState }) {
if (getState().diffing.secondSnapshotId === null) {
return;
}
assert(getState().diffing.firstSnapshotId, "Should have first snapshot id");
if (getState().diffing.state === diffingState.TAKING_DIFF) {
// There is an existing task that will ensure that the diffing data is
// up-to-date.
return;
}
const { firstSnapshotId, secondSnapshotId } = getState().diffing;
const first = getSnapshot(getState(), firstSnapshotId);
const second = getSnapshot(getState(), secondSnapshotId);
dispatch(takeCensusDiff(heapWorker, first, second));
};
});
/**
* Select the given snapshot for diffing and refresh the diffing data if
* necessary (for example, if two snapshots are now selected for diffing).
*
* @param {HeapAnalysesClient} heapWorker
* @param {snapshotModel} snapshot
*/
exports.selectSnapshotForDiffingAndRefresh = function(heapWorker, snapshot) {
return async function({ dispatch, getState }) {
assert(
getState().diffing,
"If we are selecting for diffing, we must be in diffing mode"
);
dispatch(selectSnapshotForDiffing(snapshot));
await dispatch(refreshDiffing(heapWorker));
};
};
/**
* Expand the given node in the diffing's census's delta-report.
*
* @param {CensusTreeNode} node
*/
exports.expandDiffingCensusNode = function(node) {
return {
type: actions.EXPAND_DIFFING_CENSUS_NODE,
node,
};
};
/**
* Collapse the given node in the diffing's census's delta-report.
*
* @param {CensusTreeNode} node
*/
exports.collapseDiffingCensusNode = function(node) {
return {
type: actions.COLLAPSE_DIFFING_CENSUS_NODE,
node,
};
};
/**
* Focus the given node in the snapshot's census's report.
*
* @param {DominatorTreeNode} node
*/
exports.focusDiffingCensusNode = function(node) {
return {
type: actions.FOCUS_DIFFING_CENSUS_NODE,
node,
};
};
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