Major database refactor (again)
This commit is contained in:
Ske
236
PluralKit.Core/Database/Repository/ModelRepository.Switch.cs
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236
PluralKit.Core/Database/Repository/ModelRepository.Switch.cs
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading.Tasks;
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using Dapper;
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using NodaTime;
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using NpgsqlTypes;
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namespace PluralKit.Core
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{
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public partial class ModelRepository
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{
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public async Task AddSwitch(IPKConnection conn, SystemId system, IReadOnlyCollection<MemberId> members)
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{
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// Use a transaction here since we're doing multiple executed commands in one
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await using var tx = await conn.BeginTransactionAsync();
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// First, we insert the switch itself
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var sw = await conn.QuerySingleAsync<PKSwitch>("insert into switches(system) values (@System) returning *",
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new {System = system});
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// Then we insert each member in the switch in the switch_members table
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await using (var w = conn.BeginBinaryImport("copy switch_members (switch, member) from stdin (format binary)"))
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{
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foreach (var member in members)
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{
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await w.StartRowAsync();
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await w.WriteAsync(sw.Id.Value, NpgsqlDbType.Integer);
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await w.WriteAsync(member.Value, NpgsqlDbType.Integer);
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}
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await w.CompleteAsync();
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}
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// Finally we commit the tx, since the using block will otherwise rollback it
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await tx.CommitAsync();
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_logger.Information("Created {SwitchId} in {SystemId}: {Members}", sw.Id, system, members);
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}
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public async Task MoveSwitch(IPKConnection conn, SwitchId id, Instant time)
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{
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await conn.ExecuteAsync("update switches set timestamp = @Time where id = @Id",
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new {Time = time, Id = id});
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_logger.Information("Updated {SwitchId} timestamp: {SwitchTimestamp}", id, time);
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}
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public async Task DeleteSwitch(IPKConnection conn, SwitchId id)
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{
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await conn.ExecuteAsync("delete from switches where id = @Id", new {Id = id});
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_logger.Information("Deleted {Switch}", id);
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}
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public async Task DeleteAllSwitches(IPKConnection conn, SystemId system)
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{
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await conn.ExecuteAsync("delete from switches where system = @Id", new {Id = system});
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_logger.Information("Deleted all switches in {SystemId}", system);
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}
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public IAsyncEnumerable<PKSwitch> GetSwitches(IPKConnection conn, SystemId system)
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{
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// TODO: refactor the PKSwitch data structure to somehow include a hydrated member list
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return conn.QueryStreamAsync<PKSwitch>(
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"select * from switches where system = @System order by timestamp desc",
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new {System = system});
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}
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public async Task<int> GetSwitchCount(IPKConnection conn, SystemId system)
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{
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return await conn.QuerySingleAsync<int>("select count(*) from switches where system = @Id", new { Id = system });
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}
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public async IAsyncEnumerable<SwitchMembersListEntry> GetSwitchMembersList(IPKConnection conn,
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SystemId system, Instant start, Instant end)
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{
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// Wrap multiple commands in a single transaction for performance
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await using var tx = await conn.BeginTransactionAsync();
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// Find the time of the last switch outside the range as it overlaps the range
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// If no prior switch exists, the lower bound of the range remains the start time
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var lastSwitch = await conn.QuerySingleOrDefaultAsync<Instant>(
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@"SELECT COALESCE(MAX(timestamp), @Start)
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FROM switches
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WHERE switches.system = @System
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AND switches.timestamp < @Start",
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new {System = system, Start = start});
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// Then collect the time and members of all switches that overlap the range
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var switchMembersEntries = conn.QueryStreamAsync<SwitchMembersListEntry>(
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@"SELECT switch_members.member, switches.timestamp
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FROM switches
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LEFT JOIN switch_members
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ON switches.id = switch_members.switch
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WHERE switches.system = @System
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AND (
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switches.timestamp >= @Start
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OR switches.timestamp = @LastSwitch
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)
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AND switches.timestamp < @End
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ORDER BY switches.timestamp DESC",
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new {System = system, Start = start, End = end, LastSwitch = lastSwitch});
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// Yield each value here
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await foreach (var entry in switchMembersEntries)
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yield return entry;
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// Don't really need to worry about the transaction here, we're not doing any *writes*
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}
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public IAsyncEnumerable<PKMember> GetSwitchMembers(IPKConnection conn, SwitchId sw)
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{
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return conn.QueryStreamAsync<PKMember>(
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"select * from switch_members, members where switch_members.member = members.id and switch_members.switch = @Switch order by switch_members.id",
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new {Switch = sw});
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}
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public async Task<PKSwitch> GetLatestSwitch(IPKConnection conn, SystemId system) =>
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// TODO: should query directly for perf
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await GetSwitches(conn, system).FirstOrDefaultAsync();
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public async Task<IEnumerable<SwitchListEntry>> GetPeriodFronters(IPKConnection conn,
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SystemId system, Instant periodStart,
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Instant periodEnd)
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{
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// TODO: IAsyncEnumerable-ify this one
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// TODO: this doesn't belong in the repo
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// Returns the timestamps and member IDs of switches overlapping the range, in chronological (newest first) order
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var switchMembers = await GetSwitchMembersList(conn, system, periodStart, periodEnd).ToListAsync();
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// query DB for all members involved in any of the switches above and collect into a dictionary for future use
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// this makes sure the return list has the same instances of PKMember throughout, which is important for the dictionary
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// key used in GetPerMemberSwitchDuration below
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var membersList = await conn.QueryAsync<PKMember>(
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"select * from members where id = any(@Switches)", // lol postgres specific `= any()` syntax
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new {Switches = switchMembers.Select(m => m.Member.Value).Distinct().ToList()});
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var memberObjects = membersList.ToDictionary(m => m.Id);
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// Initialize entries - still need to loop to determine the TimespanEnd below
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var entries =
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from item in switchMembers
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group item by item.Timestamp
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into g
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select new SwitchListEntry
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{
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TimespanStart = g.Key,
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Members = g.Where(x => x.Member != default(MemberId)).Select(x => memberObjects[x.Member])
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.ToList()
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};
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// Loop through every switch that overlaps the range and add it to the output list
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// end time is the *FOLLOWING* switch's timestamp - we cheat by working backwards from the range end, so no dates need to be compared
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var endTime = periodEnd;
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var outList = new List<SwitchListEntry>();
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foreach (var e in entries)
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{
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// Override the start time of the switch if it's outside the range (only true for the "out of range" switch we included above)
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var switchStartClamped = e.TimespanStart < periodStart
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? periodStart
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: e.TimespanStart;
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outList.Add(new SwitchListEntry
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{
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Members = e.Members, TimespanStart = switchStartClamped, TimespanEnd = endTime
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});
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// next switch's end is this switch's start (we're working backward in time)
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endTime = e.TimespanStart;
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}
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return outList;
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}
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public async Task<FrontBreakdown> GetFrontBreakdown(IPKConnection conn, SystemId system, Instant periodStart,
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Instant periodEnd)
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{
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// TODO: this doesn't belong in the repo
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var dict = new Dictionary<PKMember, Duration>();
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var noFronterDuration = Duration.Zero;
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// Sum up all switch durations for each member
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// switches with multiple members will result in the duration to add up to more than the actual period range
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var actualStart = periodEnd; // will be "pulled" down
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var actualEnd = periodStart; // will be "pulled" up
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foreach (var sw in await GetPeriodFronters(conn, system, periodStart, periodEnd))
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{
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var span = sw.TimespanEnd - sw.TimespanStart;
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foreach (var member in sw.Members)
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{
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if (!dict.ContainsKey(member)) dict.Add(member, span);
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else dict[member] += span;
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}
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if (sw.Members.Count == 0) noFronterDuration += span;
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if (sw.TimespanStart < actualStart) actualStart = sw.TimespanStart;
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if (sw.TimespanEnd > actualEnd) actualEnd = sw.TimespanEnd;
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}
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return new FrontBreakdown
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{
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MemberSwitchDurations = dict,
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NoFronterDuration = noFronterDuration,
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RangeStart = actualStart,
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RangeEnd = actualEnd
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};
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}
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}
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public struct SwitchListEntry
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{
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public ICollection<PKMember> Members;
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public Instant TimespanStart;
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public Instant TimespanEnd;
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}
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public struct FrontBreakdown
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{
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public Dictionary<PKMember, Duration> MemberSwitchDurations;
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public Duration NoFronterDuration;
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public Instant RangeStart;
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public Instant RangeEnd;
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}
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public struct SwitchMembersListEntry
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{
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public MemberId Member;
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public Instant Timestamp;
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}
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}
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