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V2 #36

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danieljsummers merged 17 commits from v2-out-the-door into main 2023-02-26 18:01:21 +00:00
Conversation 0 Commits 17 Files Changed 36 +55 -64
3 changed files with 55 additions and 64 deletions
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56
src/MyWebLog.Data/Postgres/PostgresCache.fs
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@ -2,6 +2,7 @@ namespace MyWebLog.Data.Postgres
open System.Threading
open System.Threading.Tasks
open BitBadger.Npgsql.FSharp.Documents
open Microsoft.Extensions.Caching.Distributed
open NodaTime
open Npgsql.FSharp
@ -39,35 +40,30 @@ module private Helpers =
typedParam "expireAt"
open Npgsql
/// A distributed cache implementation in PostgreSQL used to handle sessions for myWebLog
type DistributedCache (dataSource : NpgsqlDataSource) =
type DistributedCache () =
// ~~~ INITIALIZATION ~~~
do
task {
let! exists =
Sql.fromDataSource dataSource
Configuration.dataSource ()
|> Sql.fromDataSource
|> Sql.query $"
SELECT EXISTS
(SELECT 1 FROM pg_tables WHERE schemaname = 'public' AND tablename = 'session')
AS {existsName}"
|> Sql.executeRowAsync Map.toExists
if not exists then
let! _ =
Sql.fromDataSource dataSource
|> Sql.query
do! Custom.nonQuery
"CREATE TABLE session (
id TEXT NOT NULL PRIMARY KEY,
payload BYTEA NOT NULL,
expire_at TIMESTAMPTZ NOT NULL,
sliding_expiration INTERVAL,
absolute_expiration TIMESTAMPTZ);
CREATE INDEX idx_session_expiration ON session (expire_at)"
|> Sql.executeNonQueryAsync
()
CREATE INDEX idx_session_expiration ON session (expire_at)" []
} |> sync
// ~~~ SUPPORT FUNCTIONS ~~~
@ -76,16 +72,13 @@ type DistributedCache (dataSource : NpgsqlDataSource) =
let getEntry key = backgroundTask {
let idParam = "@id", Sql.string key
let! tryEntry =
Sql.fromDataSource dataSource
|> Sql.query "SELECT * FROM session WHERE id = @id"
|> Sql.parameters [ idParam ]
|> Sql.executeAsync (fun row ->
Custom.single "SELECT * FROM session WHERE id = @id" [ idParam ]
(fun row ->
{ Id = row.string "id"
Payload = row.bytea "payload"
ExpireAt = row.fieldValue<Instant> "expire_at"
SlidingExpiration = row.fieldValueOrNone<Duration> "sliding_expiration"
AbsoluteExpiration = row.fieldValueOrNone<Instant> "absolute_expiration" })
|> tryHead
match tryEntry with
| Some entry ->
let now = getNow ()
@ -98,11 +91,8 @@ type DistributedCache (dataSource : NpgsqlDataSource) =
true, { entry with ExpireAt = absExp }
else true, { entry with ExpireAt = now.Plus slideExp }
if needsRefresh then
let! _ =
Sql.fromDataSource dataSource
|> Sql.query "UPDATE session SET expire_at = @expireAt WHERE id = @id"
|> Sql.parameters [ expireParam item.ExpireAt; idParam ]
|> Sql.executeNonQueryAsync
do! Custom.nonQuery "UPDATE session SET expire_at = @expireAt WHERE id = @id"
[ expireParam item.ExpireAt; idParam ]
()
return if item.ExpireAt > now then Some entry else None
| None -> return None
@ -115,26 +105,16 @@ type DistributedCache (dataSource : NpgsqlDataSource) =
let purge () = backgroundTask {
let now = getNow ()
if lastPurge.Plus (Duration.FromMinutes 30L) < now then
let! _ =
Sql.fromDataSource dataSource
|> Sql.query "DELETE FROM session WHERE expire_at < @expireAt"
|> Sql.parameters [ expireParam now ]
|> Sql.executeNonQueryAsync
do! Custom.nonQuery "DELETE FROM session WHERE expire_at < @expireAt" [ expireParam now ]
lastPurge <- now
}
/// Remove a cache entry
let removeEntry key = backgroundTask {
let! _ =
Sql.fromDataSource dataSource
|> Sql.query "DELETE FROM session WHERE id = @id"
|> Sql.parameters [ "@id", Sql.string key ]
|> Sql.executeNonQueryAsync
()
}
let removeEntry key =
Delete.byId "session" key
/// Save an entry
let saveEntry (opts : DistributedCacheEntryOptions) key payload = backgroundTask {
let saveEntry (opts : DistributedCacheEntryOptions) key payload =
let now = getNow ()
let expireAt, slideExp, absExp =
if opts.SlidingExpiration.HasValue then
@ -150,9 +130,7 @@ type DistributedCache (dataSource : NpgsqlDataSource) =
// Default to 1 hour sliding expiration
let slide = Duration.FromHours 1
now.Plus slide, Some slide, None
let! _ =
Sql.fromDataSource dataSource
|> Sql.query
Custom.nonQuery
"INSERT INTO session (
id, payload, expire_at, sliding_expiration, absolute_expiration
) VALUES (
@ -162,15 +140,11 @@ type DistributedCache (dataSource : NpgsqlDataSource) =
expire_at = EXCLUDED.expire_at,
sliding_expiration = EXCLUDED.sliding_expiration,
absolute_expiration = EXCLUDED.absolute_expiration"
|> Sql.parameters
[ "@id", Sql.string key
"@payload", Sql.bytea payload
expireParam expireAt
optParam "slideExp" slideExp
optParam "absExp" absExp ]
|> Sql.executeNonQueryAsync
()
}
// ~~~ IMPLEMENTATION FUNCTIONS ~~~

19
src/MyWebLog.Data/PostgresData.fs
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@ -1,8 +1,8 @@
namespace MyWebLog.Data
open Microsoft.Extensions.Logging
open BitBadger.Npgsql.Documents
open BitBadger.Npgsql.FSharp.Documents
open Microsoft.Extensions.Logging
open MyWebLog
open MyWebLog.Data.Postgres
open Newtonsoft.Json
@ -139,6 +139,23 @@ type PostgresData (source : NpgsqlDataSource, log : ILogger<PostgresData>, ser :
let migrate version = backgroundTask {
match version with
| Some "v2-rc2" -> ()
| Some "v2" ->
printfn "** MANUAL DATABASE UPGRADE REQUIRED **\n"
printfn "The data structure for PostgreSQL changed significantly between v2-rc2 and v2."
printfn "To migrate your data:"
printfn " - Using a v2-rc2 executable, back up each web log"
printfn " - Drop all tables from the database"
printfn " - Using this executable, restore each backup"
let! webLogs =
Configuration.dataSource ()
|> Sql.fromDataSource
|> Sql.query $"SELECT url_base FROM {Table.WebLog}"
|> Sql.executeAsync (fun row -> row.string "url_base")
printfn "\nCommands to back up all web logs:"
webLogs |> List.iter (printfn "myWebLog backup %s")
exit 1
// Future versions will be inserted here
| Some _
| None ->

6
src/MyWebLog/Program.fs
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@ -10,7 +10,7 @@ type WebLogMiddleware (next : RequestDelegate, log : ILogger<WebLogMiddleware>)
/// Is the debug level enabled on the logger?
let isDebug = log.IsEnabled LogLevel.Debug
member this.InvokeAsync (ctx : HttpContext) = task {
member _.InvokeAsync (ctx : HttpContext) = task {
/// Create the full path of the request
let path = $"{ctx.Request.Scheme}://{ctx.Request.Host.Value}{ctx.Request.Path.Value}"
match WebLogCache.tryGet path with
@ -165,8 +165,8 @@ let rec main args =
DataImplementation.createNpgsqlDataSource (sp.GetRequiredService<IConfiguration> ()))
let _ = builder.Services.AddSingleton<IData> postgres
let _ =
builder.Services.AddSingleton<IDistributedCache> (fun sp ->
Postgres.DistributedCache (sp.GetRequiredService<NpgsqlDataSource> ()) :> IDistributedCache)
builder.Services.AddSingleton<IDistributedCache> (fun _ ->
Postgres.DistributedCache () :> IDistributedCache)
()
| _ -> ()