HAXY

▄▄▄▄▀▄ ▄▀▀▀▀▀▀▀▀ ▄▄▄▄ ▀▀▀▀▀▄▀▀▀▀▄ ▄▀▀▀▀▀▄ ▀▀▀▀▀▄▄▄▀▀▀ ▄▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▄▀▀▀ ▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▄▀▄▄ ▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▄▀▀ ▀▀▀▀▀▀ ▀▀▀▀▀▀▄▀▀▀▀▀▀▀▀▄ ▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▄ ▀▀▀ ▀▀▀▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▄ ▀▀▀ ▄▀▀▀▀▄▀▀▀▀▀▀▀▀▀▄▄▀▀▀ ▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▄▄▄▄▀ ▀▀ ▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀▄▀▀▀▀ ▀ ▀▀▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▄▀▀▀▄ ▄▀▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀ ▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀ ▀▀▀▀▀▀▀▄▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀▀▀▄ ▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀▀▀▀▀▄▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀▀▄▀▄▄▀▀▄▀▀ ▀▀▀▀▀▀▄▄▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀ ▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀▀▄▄▄▀▀▀▀▄▀▀▀▄▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▄▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▄ ▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀ ▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀ ▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▄▄▀▀ ▀▀▀▄▀ ▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀ ▀ ▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀▀▀▀▀ ▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀▀ ▀ ▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▄▀ ▀▄ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀ ▀▀ ▀▀▀▀▀▀▀▄▄▄▀▀▀▀▀▀▀▀▀▀▀▀ ▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀

╭ event.zig ────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯

╭────╮ ╭ clone ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╮ │http│ ssh │ │ ╰────╯ ╰ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╯

.. test/ command.zig ╭─────────────────────────────────╮ │event.zig │ ╰─────────────────────────────────╯ lib.zig main.zig serve.zig ssh_helper.zig test.zig testnet.zig

1 const std = @import("std"); 2 const xit = @import("xit"); 3 const rp = xit.repo; 4 const hash = xit.hash; 5 6 const event_id_size: usize = 32; 7 8 pub const EventData = union(enum) { 9 issue: struct { 10 title: []const u8, 11 description: []const u8, 12 tags: []const []const u8, 13 }, 14 }; 15 16 pub const Event = struct { 17 id: [event_id_size * 2]u8, 18 data: EventData, 19 }; 20 21 /// associates an Event with a git object id. 22 /// we save this oid in the database so we can reliably re-consume 23 /// events if their oid changed. this can happen if the branch 24 /// is rebased and force-pushed. 25 pub fn RepoEvent(comptime hash_kind: hash.HashKind) type { 26 return struct { 27 oid: [hash.byteLen(hash_kind)]u8, 28 event: Event, 29 }; 30 } 31 32 pub fn randomId(random: std.Random) [event_id_size]u8 { 33 var id_bytes: [event_id_size]u8 = undefined; 34 random.bytes(&id_bytes); 35 return id_bytes; 36 } 37 38 pub fn consume( 39 comptime DB: type, 40 comptime hash_kind: hash.HashKind, 41 io: std.Io, 42 db: *DB, 43 db_file: std.Io.File, 44 repo_events: []RepoEvent(hash_kind), 45 ) !void { 46 const Ctx = struct { 47 repo_events: []RepoEvent(hash_kind), 48 49 pub fn run(ctx: @This(), cursor: *DB.Cursor(.read_write)) !void { 50 const moment = try DB.HashMap(.read_write).init(cursor.*); 51 52 // the map with all of haxy's state and materialized views 53 const haxy_cursor = try moment.putCursor(hash.hashInt(hash_kind, "haxy")); 54 const haxy = try DB.HashMap(.read_write).init(haxy_cursor); 55 56 // try reading the last object id that was consumed 57 var last_object_id_maybe: ?[hash.byteLen(hash_kind)]u8 = null; 58 if (try haxy.getCursor(hash.hashInt(hash_kind, "last-object-id"))) |last_object_id_cursor| { 59 var last_object_id_buffer: [hash.byteLen(hash_kind)]u8 = undefined; 60 _ = try last_object_id_cursor.readBytes(&last_object_id_buffer); 61 last_object_id_maybe = last_object_id_buffer; 62 } 63 64 // for each event we want to consume... 65 for (ctx.repo_events) |repo_event| { 66 // map with the views as they appeared when each event was consumed. 67 // we can use this to see (and revert) the views to any previous state. 68 const object_id_to_views_cursor = try haxy.putCursor(hash.hashInt(hash_kind, "object-id->views")); 69 const object_id_to_views = try DB.HashMap(.read_write).init(object_id_to_views_cursor); 70 71 // create a new views map for the current event we are consuming 72 var views_cursor = try object_id_to_views.putCursor(hash.bytesToInt(hash_kind, &repo_event.oid)); 73 74 // if there was a previous event, set the views map to have the same value as it. 75 // this efficiently "clones" the map so we make further modifications based on it. 76 if (last_object_id_maybe) |*last_object_id| { 77 if (try object_id_to_views.getCursor(hash.bytesToInt(hash_kind, last_object_id))) |last_view_cursor| { 78 try views_cursor.write(.{ .slot = last_view_cursor.slot() }); 79 } 80 } 81 82 // consume the event into the views map 83 { 84 const event = repo_event.event; 85 86 // get the id of the current event as bytes 87 var current_event_id: [event_id_size]u8 = undefined; 88 _ = try std.fmt.hexToBytes(&current_event_id, &event.id); 89 90 const views = try DB.HashMap(.read_write).init(views_cursor); 91 92 switch (event.data) { 93 .issue => |data| { 94 const event_id_to_issue_cursor = try views.putCursor(hash.hashInt(hash_kind, "event-id->issue")); 95 const event_id_to_issue = try DB.HashMap(.read_write).init(event_id_to_issue_cursor); 96 97 const issue_cursor = try event_id_to_issue.putCursor(hash.hashInt(hash_kind, &current_event_id)); 98 const issue = try DB.HashMap(.read_write).init(issue_cursor); 99 100 try putIfDifferent(issue, hash.hashInt(hash_kind, "title"), data.title); 101 try putIfDifferent(issue, hash.hashInt(hash_kind, "description"), data.description); 102 }, 103 } 104 } 105 106 // the current object id is now the last one 107 last_object_id_maybe = repo_event.oid; 108 109 // prevent any of the data created above from being mutated by future iterations of this loop 110 try cursor.db.freeze(); 111 } 112 113 if (last_object_id_maybe) |*last_object_id| { 114 try haxy.put(hash.hashInt(hash_kind, "last-object-id"), .{ .bytes = last_object_id }); 115 } 116 } 117 118 fn putIfDifferent(map: DB.HashMap(.read_write), key: hash.HashInt(hash_kind), value: []const u8) !void { 119 if (try map.getCursor(key)) |value_cursor| { 120 var buffer: [4096]u8 = undefined; 121 const existing_value = try value_cursor.readBytes(&buffer); 122 if (std.mem.eql(u8, existing_value, value)) { 123 return; 124 } 125 } 126 127 try map.put(key, .{ .bytes = value }); 128 } 129 }; 130 131 try db_file.lock(io, .exclusive); 132 defer db_file.unlock(io); 133 134 // create a new transaction in the database that runs the above-defined Ctx function 135 const history = try DB.ArrayList(.read_write).init(db.rootCursor()); 136 try history.appendContext(.{ .slot = try history.getSlot(-1) }, Ctx{ .repo_events = repo_events }); 137 } 138