HAXY

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

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

.. Assignment.zig Attachment.zig Comment.zig Discussion.zig Fork.zig ╭─────────────────────────────────╮ │Grant.zig │ ╰─────────────────────────────────╯ Issue.zig Notify.zig Patch.zig PatchRev.zig Repo.zig User.zig

1 const std = @import("std"); 2 const evt = @import("../event.zig"); 3 const xit = @import("xit"); 4 const hash = xit.hash; 5 6 // what the grant gives access to, held in the same user repo 7 target_id: [evt.event_id_size * 2]u8, 8 // who it gives access to 9 user_id: [evt.event_id_size * 2]u8, 10 role: evt.Repo.Role, 11 12 // what the db stores: the event's data plus the commit-derived fields 13 pub const Record = struct { 14 event: Self, 15 removed: bool = false, 16 created_order: u64 = 0, 17 updated_order: u64 = 0, 18 }; 19 20 const Self = @This(); 21 22 // the moment keys `evt.merge` reads and writes for this kind 23 pub const merge_policy: evt.MergePolicy = .target_wins; 24 pub const record_map_key = "event-id->grant"; 25 pub const all_id_set_key = "grant-id-set"; 26 pub const target_to_grant_id_set_key = "target->grant-id-set"; 27 28 // the id of the one grant a user can hold on a target 29 pub fn idOf(target_id: *const [evt.event_id_size]u8, user_id: *const [evt.event_id_size]u8) [evt.event_id_size]u8 { 30 var hasher = std.crypto.hash.sha2.Sha256.init(.{}); 31 hasher.update(target_id); 32 hasher.update(user_id); 33 var digest: [std.crypto.hash.sha2.Sha256.digest_length]u8 = undefined; 34 hasher.final(&digest); 35 return digest[0..evt.event_id_size].*; 36 } 37 38 // only what the event says about itself is checked. a grant naming a missing 39 // target or user is inert. 40 fn validate(event_id: *const [evt.event_id_size]u8, record: Record) !void { 41 const target_id = try evt.parseEventId(&record.event.target_id); 42 const user_id = try evt.parseEventId(&record.event.user_id); 43 if (!std.mem.eql(u8, event_id, &idOf(&target_id, &user_id))) return error.InvalidGrantId; 44 } 45 46 pub fn consume( 47 comptime DB: type, 48 comptime hash_kind: hash.HashKind, 49 haxy_moment: DB.HashMap(.read_write), 50 event_id: *const [evt.event_id_size]u8, 51 record_maybe: ?Record, 52 arena: *std.heap.ArenaAllocator, 53 _: ?[]const u8, 54 ) !void { 55 const grant_key = hash.hashInt(hash_kind, event_id); 56 const records = try DB.HashMap(.read_write).init(try haxy_moment.putCursor(hash.hashInt(hash_kind, record_map_key))); 57 const by_target = try DB.HashMap(.read_write).init(try haxy_moment.putCursor(hash.hashInt(hash_kind, target_to_grant_id_set_key))); 58 59 var existing_maybe: ?Record = null; 60 const existing_cursor_maybe = try records.getCursor(grant_key); 61 if (existing_cursor_maybe) |cursor| { 62 existing_maybe = try evt.read(Record, DB, hash_kind, arena, try DB.HashMap(.read_only).init(cursor)); 63 } 64 65 var record = record_maybe orelse try evt.removedRecord(Record, DB, hash_kind, haxy_moment.readOnly(), existing_maybe); 66 67 if (!record.removed) try validate(event_id, record); 68 69 if (existing_maybe) |existing| { 70 // updates preserve the original creation metadata 71 record.created_order = existing.created_order; 72 } 73 74 const grant_cursor = try records.putCursor(grant_key); 75 try evt.upsert(Record, DB, hash_kind, try DB.HashMap(.read_write).init(grant_cursor), record); 76 try evt.indexEvent(DB, hash_kind, haxy_moment, event_id, .grant, existing_maybe, record); 77 78 const order_key = evt.orderKeyDesc(record.created_order, event_id); 79 80 // the id set retains removed records so merges can carry removals 81 if (existing_cursor_maybe == null) { 82 const ids = try DB.SortedSet(.read_write).init(try haxy_moment.putCursor(hash.hashInt(hash_kind, all_id_set_key))); 83 try ids.put(&order_key); 84 } 85 86 // the id fixes the target, so a grant never moves between sets 87 const target_id = try evt.parseEventId(&record.event.target_id); 88 const target_grants = try DB.SortedSet(.read_write).init(try by_target.putCursor(hash.hashInt(hash_kind, &target_id))); 89 if (record.removed) { 90 _ = try target_grants.remove(&order_key); 91 } else { 92 try target_grants.put(&order_key); 93 } 94 } 95 96 // the role a user was granted on a target, or null without an active grant 97 pub fn readRole( 98 comptime DB: type, 99 comptime hash_kind: hash.HashKind, 100 haxy_moment: DB.HashMap(.read_only), 101 arena: *std.heap.ArenaAllocator, 102 target_id: *const [evt.event_id_size]u8, 103 user_id: *const [evt.event_id_size]u8, 104 ) !?evt.Repo.Role { 105 const Granted = struct { event: struct { role: evt.Repo.Role }, removed: bool }; 106 const grant = (try evt.readRecordSubset(Self, Granted, DB, hash_kind, haxy_moment, arena, &idOf(target_id, user_id))) orelse return null; 107 return if (grant.removed) null else grant.event.role; 108 } 109 110 // a target's active grants, newest first 111 pub fn readByTarget( 112 comptime DB: type, 113 comptime hash_kind: hash.HashKind, 114 haxy_moment: DB.HashMap(.read_only), 115 arena: *std.heap.ArenaAllocator, 116 target_id: *const [evt.event_id_size]u8, 117 ) ![]const Self { 118 var grants: std.ArrayList(Self) = .empty; 119 const by_target_cursor = try haxy_moment.getCursor(hash.hashInt(hash_kind, target_to_grant_id_set_key)) orelse return grants.items; 120 const by_target = try DB.HashMap(.read_only).init(by_target_cursor); 121 const target_grants_cursor = try by_target.getCursor(hash.hashInt(hash_kind, target_id)) orelse return grants.items; 122 const target_grants = try DB.SortedSet(.read_only).init(target_grants_cursor); 123 124 var iter = try target_grants.iteratorFromIndex(0); 125 while (try iter.next()) |kv_cursor| { 126 const grant_id = try evt.readOrderKeyId(DB, kv_cursor); 127 const grant = (try evt.readRecordSubset(Self, struct { event: Self }, DB, hash_kind, haxy_moment, arena, &grant_id)) orelse continue; 128 try grants.append(arena.allocator(), grant.event); 129 } 130 return grants.items; 131 } 132