Version 2, ready for beta
This commit was merged in pull request #1.
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395
src/MyWebLog/Maintenance.fs
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395
src/MyWebLog/Maintenance.fs
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module MyWebLog.Maintenance
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open System
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open System.IO
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open Microsoft.Extensions.DependencyInjection
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open MyWebLog.Data
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/// Create the web log information
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let private doCreateWebLog (args : string[]) (sp : IServiceProvider) = task {
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let data = sp.GetRequiredService<IData> ()
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let timeZone =
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let local = TimeZoneInfo.Local.Id
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match TimeZoneInfo.Local.HasIanaId with
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| true -> local
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| false ->
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match TimeZoneInfo.TryConvertWindowsIdToIanaId local with
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| true, ianaId -> ianaId
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| false, _ -> raise <| TimeZoneNotFoundException $"Cannot find IANA timezone for {local}"
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// Create the web log
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let webLogId = WebLogId.create ()
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let userId = WebLogUserId.create ()
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let homePageId = PageId.create ()
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do! data.WebLog.add
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{ WebLog.empty with
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id = webLogId
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name = args[2]
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urlBase = args[1]
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defaultPage = PageId.toString homePageId
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timeZone = timeZone
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}
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// Create the admin user
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let salt = Guid.NewGuid ()
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do! data.WebLogUser.add
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{ WebLogUser.empty with
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id = userId
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webLogId = webLogId
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userName = args[3]
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firstName = "Admin"
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lastName = "User"
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preferredName = "Admin"
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passwordHash = Handlers.User.hashedPassword args[4] args[3] salt
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salt = salt
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authorizationLevel = Administrator
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}
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// Create the default home page
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do! data.Page.add
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{ Page.empty with
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id = homePageId
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webLogId = webLogId
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authorId = userId
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title = "Welcome to myWebLog!"
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permalink = Permalink "welcome-to-myweblog.html"
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publishedOn = DateTime.UtcNow
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updatedOn = DateTime.UtcNow
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text = "<p>This is your default home page.</p>"
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revisions = [
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{ asOf = DateTime.UtcNow
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text = Html "<p>This is your default home page.</p>"
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}
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]
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}
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printfn $"Successfully initialized database for {args[2]} with URL base {args[1]}"
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}
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/// Create a new web log
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let createWebLog args sp = task {
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match args |> Array.length with
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| 5 -> do! doCreateWebLog args sp
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| _ -> printfn "Usage: MyWebLog init [url] [name] [admin-email] [admin-pw]"
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}
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/// Import prior permalinks from a text files with lines in the format "[old] [new]"
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let importPriorPermalinks urlBase file (sp : IServiceProvider) = task {
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let data = sp.GetRequiredService<IData> ()
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match! data.WebLog.findByHost urlBase with
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| Some webLog ->
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let mapping =
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File.ReadAllLines file
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|> Seq.ofArray
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|> Seq.map (fun it ->
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let parts = it.Split " "
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Permalink parts[0], Permalink parts[1])
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for old, current in mapping do
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match! data.Post.findByPermalink current webLog.id with
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| Some post ->
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let! withLinks = data.Post.findFullById post.id post.webLogId
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let! _ = data.Post.updatePriorPermalinks post.id post.webLogId
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(old :: withLinks.Value.priorPermalinks)
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printfn $"{Permalink.toString old} -> {Permalink.toString current}"
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| None -> printfn $"Cannot find current post for {Permalink.toString current}"
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printfn "Done!"
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| None -> eprintfn $"No web log found at {urlBase}"
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}
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/// Import permalinks if all is well
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let importLinks args sp = task {
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match args |> Array.length with
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| 3 -> do! importPriorPermalinks args[1] args[2] sp
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| _ -> printfn "Usage: MyWebLog import-links [url] [file-name]"
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}
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/// Load a theme from the given ZIP file
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let loadTheme (args : string[]) (sp : IServiceProvider) = task {
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if args.Length > 1 then
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let fileName =
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match args[1].LastIndexOf Path.DirectorySeparatorChar with
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| -1 -> args[1]
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| it -> args[1][(it + 1)..]
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match Handlers.Admin.getThemeName fileName with
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| Ok themeName ->
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let data = sp.GetRequiredService<IData> ()
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let clean = if args.Length > 2 then bool.Parse args[2] else true
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use stream = File.Open (args[1], FileMode.Open)
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use copy = new MemoryStream ()
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do! stream.CopyToAsync copy
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do! Handlers.Admin.loadThemeFromZip themeName copy clean data
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printfn $"Theme {themeName} loaded successfully"
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| Error message -> eprintfn $"{message}"
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else
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printfn "Usage: MyWebLog load-theme [theme-zip-file-name] [*clean-load]"
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printfn " * optional, defaults to true"
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}
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/// Back up a web log's data
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module Backup =
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open System.Threading.Tasks
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open MyWebLog.Converters
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open Newtonsoft.Json
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/// A theme asset, with the data base-64 encoded
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type EncodedAsset =
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{ /// The ID of the theme asset
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id : ThemeAssetId
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/// The updated date for this asset
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updatedOn : DateTime
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/// The data for this asset, base-64 encoded
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data : string
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}
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/// Create an encoded theme asset from the original theme asset
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static member fromAsset (asset : ThemeAsset) =
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{ id = asset.id
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updatedOn = asset.updatedOn
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data = Convert.ToBase64String asset.data
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}
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/// Create a theme asset from an encoded theme asset
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static member fromAsset (asset : EncodedAsset) : ThemeAsset =
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{ id = asset.id
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updatedOn = asset.updatedOn
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data = Convert.FromBase64String asset.data
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}
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/// A unified archive for a web log
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type Archive =
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{ /// The web log to which this archive belongs
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webLog : WebLog
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/// The users for this web log
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users : WebLogUser list
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/// The theme used by this web log at the time the archive was made
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theme : Theme
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/// Assets for the theme used by this web log at the time the archive was made
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assets : EncodedAsset list
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/// The categories for this web log
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categories : Category list
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/// The tag mappings for this web log
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tagMappings : TagMap list
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/// The pages for this web log (containing only the most recent revision)
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pages : Page list
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/// The posts for this web log (containing only the most recent revision)
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posts : Post list
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}
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/// Create a JSON serializer (uses RethinkDB data implementation's JSON converters)
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let private getSerializer prettyOutput =
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let serializer = JsonSerializer.CreateDefault ()
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Json.all () |> Seq.iter serializer.Converters.Add
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if prettyOutput then serializer.Formatting <- Formatting.Indented
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serializer
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/// Display statistics for a backup archive
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let private displayStats (msg : string) (webLog : WebLog) archive =
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let userCount = List.length archive.users
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let assetCount = List.length archive.assets
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let categoryCount = List.length archive.categories
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let tagMapCount = List.length archive.tagMappings
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let pageCount = List.length archive.pages
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let postCount = List.length archive.posts
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// Create a pluralized output based on the count
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let plural count ifOne ifMany =
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if count = 1 then ifOne else ifMany
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printfn ""
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printfn $"""{msg.Replace ("{{NAME}}", webLog.name)}"""
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printfn $""" - The theme "{archive.theme.name}" with {assetCount} asset{plural assetCount "" "s"}"""
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printfn $""" - {userCount} user{plural userCount "" "s"}"""
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printfn $""" - {categoryCount} categor{plural categoryCount "y" "ies"}"""
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printfn $""" - {tagMapCount} tag mapping{plural tagMapCount "" "s"}"""
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printfn $""" - {pageCount} page{plural pageCount "" "s"}"""
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printfn $""" - {postCount} post{plural postCount "" "s"}"""
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/// Create a backup archive
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let private createBackup webLog (fileName : string) prettyOutput (data : IData) = task {
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// Create the data structure
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let themeId = ThemeId webLog.themePath
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printfn "- Exporting theme..."
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let! theme = data.Theme.findById themeId
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let! assets = data.ThemeAsset.findByThemeWithData themeId
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printfn "- Exporting users..."
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let! users = data.WebLogUser.findByWebLog webLog.id
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printfn "- Exporting categories and tag mappings..."
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let! categories = data.Category.findByWebLog webLog.id
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let! tagMaps = data.TagMap.findByWebLog webLog.id
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printfn "- Exporting pages..."
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let! pages = data.Page.findFullByWebLog webLog.id
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printfn "- Exporting posts..."
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let! posts = data.Post.findFullByWebLog webLog.id
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printfn "- Writing archive..."
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let archive = {
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webLog = webLog
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users = users
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theme = Option.get theme
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assets = assets |> List.map EncodedAsset.fromAsset
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categories = categories
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tagMappings = tagMaps
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pages = pages |> List.map (fun p -> { p with revisions = List.truncate 1 p.revisions })
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posts = posts |> List.map (fun p -> { p with revisions = List.truncate 1 p.revisions })
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}
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// Write the structure to the backup file
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if File.Exists fileName then File.Delete fileName
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let serializer = getSerializer prettyOutput
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use writer = new StreamWriter (fileName)
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serializer.Serialize (writer, archive)
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writer.Close ()
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displayStats "{{NAME}} backup contains:" webLog archive
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}
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let private doRestore archive newUrlBase (data : IData) = task {
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let! restore = task {
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match! data.WebLog.findById archive.webLog.id with
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| Some webLog when defaultArg newUrlBase webLog.urlBase = webLog.urlBase ->
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do! data.WebLog.delete webLog.id
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return archive
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| Some _ ->
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// Err'body gets new IDs...
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let newWebLogId = WebLogId.create ()
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let newCatIds = archive.categories |> List.map (fun cat -> cat.id, CategoryId.create ()) |> dict
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let newMapIds = archive.tagMappings |> List.map (fun tm -> tm.id, TagMapId.create ()) |> dict
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let newPageIds = archive.pages |> List.map (fun page -> page.id, PageId.create ()) |> dict
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let newPostIds = archive.posts |> List.map (fun post -> post.id, PostId.create ()) |> dict
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let newUserIds = archive.users |> List.map (fun user -> user.id, WebLogUserId.create ()) |> dict
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return
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{ archive with
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webLog = { archive.webLog with id = newWebLogId; urlBase = Option.get newUrlBase }
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users = archive.users
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|> List.map (fun u -> { u with id = newUserIds[u.id]; webLogId = newWebLogId })
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categories = archive.categories
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|> List.map (fun c -> { c with id = newCatIds[c.id]; webLogId = newWebLogId })
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tagMappings = archive.tagMappings
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|> List.map (fun tm -> { tm with id = newMapIds[tm.id]; webLogId = newWebLogId })
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pages = archive.pages
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|> List.map (fun page ->
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{ page with
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id = newPageIds[page.id]
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webLogId = newWebLogId
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authorId = newUserIds[page.authorId]
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})
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posts = archive.posts
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|> List.map (fun post ->
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{ post with
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id = newPostIds[post.id]
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webLogId = newWebLogId
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authorId = newUserIds[post.authorId]
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categoryIds = post.categoryIds |> List.map (fun c -> newCatIds[c])
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})
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}
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| None ->
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return
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{ archive with
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webLog = { archive.webLog with urlBase = defaultArg newUrlBase archive.webLog.urlBase }
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}
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}
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// Restore theme and assets (one at a time, as assets can be large)
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printfn ""
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printfn "- Importing theme..."
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do! data.Theme.save restore.theme
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let! _ = restore.assets |> List.map (EncodedAsset.fromAsset >> data.ThemeAsset.save) |> Task.WhenAll
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// Restore web log data
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printfn "- Restoring web log..."
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do! data.WebLog.add restore.webLog
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printfn "- Restoring users..."
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do! data.WebLogUser.restore restore.users
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printfn "- Restoring categories and tag mappings..."
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do! data.TagMap.restore restore.tagMappings
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do! data.Category.restore restore.categories
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printfn "- Restoring pages..."
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do! data.Page.restore restore.pages
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printfn "- Restoring posts..."
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do! data.Post.restore restore.posts
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// TODO: comments not yet implemented
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displayStats "Restored for {{NAME}}:" restore.webLog restore
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}
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/// Decide whether to restore a backup
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let private restoreBackup (fileName : string) newUrlBase promptForOverwrite data = task {
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let serializer = getSerializer false
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use stream = new FileStream (fileName, FileMode.Open)
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use reader = new StreamReader (stream)
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use jsonReader = new JsonTextReader (reader)
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let archive = serializer.Deserialize<Archive> jsonReader
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let mutable doOverwrite = not promptForOverwrite
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if promptForOverwrite then
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printfn "** WARNING: Restoring a web log will delete existing data for that web log"
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printfn " (unless restoring to a different URL base), and will overwrite the"
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printfn " theme in either case."
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printfn ""
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printf "Continue? [Y/n] "
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doOverwrite <- not ((Console.ReadKey ()).Key = ConsoleKey.N)
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if doOverwrite then
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do! doRestore archive newUrlBase data
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else
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printfn $"{archive.webLog.name} backup restoration canceled"
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}
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/// Generate a backup archive
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let generateBackup (args : string[]) (sp : IServiceProvider) = task {
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if args.Length = 3 || args.Length = 4 then
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let data = sp.GetRequiredService<IData> ()
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match! data.WebLog.findByHost args[1] with
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| Some webLog ->
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let fileName = if args[2].EndsWith ".json" then args[2] else $"{args[2]}.json"
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let prettyOutput = args.Length = 4 && args[3] = "pretty"
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do! createBackup webLog fileName prettyOutput data
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| None -> printfn $"Error: no web log found for {args[1]}"
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else
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printfn """Usage: MyWebLog backup [url-base] [backup-file-name] [*"pretty"]"""
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printfn """ * optional - default is non-pretty JSON output"""
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}
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/// Restore a backup archive
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let restoreFromBackup (args : string[]) (sp : IServiceProvider) = task {
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if args.Length = 2 || args.Length = 3 then
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let data = sp.GetRequiredService<IData> ()
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let newUrlBase = if args.Length = 3 then Some args[2] else None
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do! restoreBackup args[1] newUrlBase (args[0] <> "do-restore") data
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else
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printfn "Usage: MyWebLog restore [backup-file-name] [*url-base]"
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printfn " * optional - will restore to original URL base if omitted"
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printfn " (use do-restore to skip confirmation prompt)"
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}
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