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default.nix
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default.nix
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{ system ? builtins.currentSystem
, profiling ? false
, iosSdkVersion ? "10.2"
, config ? {}
, reflex-platform-func ? import ./dep/reflex-platform
}:
let
reflex-platform = getReflexPlatform { inherit system; };
inherit (reflex-platform) hackGet nixpkgs;
pkgs = nixpkgs;
inherit (import dep/gitignore.nix { inherit (nixpkgs) lib; }) gitignoreSource;
getReflexPlatform = { system, enableLibraryProfiling ? profiling }: reflex-platform-func {
inherit iosSdkVersion config system enableLibraryProfiling;
nixpkgsOverlays = [
(import ./nixpkgs-overlays)
];
haskellOverlays = [
(import ./haskell-overlays/misc-deps.nix { inherit hackGet; })
pkgs.obeliskExecutableConfig.haskellOverlay
(import ./haskell-overlays/obelisk.nix)
(import ./haskell-overlays/tighten-ob-exes.nix)
];
};
# The haskell environment used to build Obelisk itself, e.g. the 'ob' command
ghcObelisk = reflex-platform.ghc;
# Development environments for obelisk packages.
ghcObeliskEnvs = pkgs.lib.mapAttrs (n: v: reflex-platform.workOn ghcObelisk v) ghcObelisk;
inherit (import ./lib/asset/assets.nix { inherit nixpkgs; }) mkAssets;
haskellLib = pkgs.haskell.lib;
in rec {
inherit reflex-platform;
inherit (reflex-platform) nixpkgs pinBuildInputs;
inherit (nixpkgs) lib;
pathGit = ./.; # Used in CI by the migration graph hash algorithm to correctly ignore files.
path = reflex-platform.filterGit ./.;
obelisk = ghcObelisk;
obeliskEnvs = pkgs.lib.filterAttrs (k: _: pkgs.lib.strings.hasPrefix "obelisk-" k) ghcObeliskEnvs;
command = ghcObelisk.obelisk-command;
shell = pinBuildInputs "obelisk-shell" ([command] ++ command.commandRuntimeDeps);
selftest = pkgs.writeScript "selftest" ''
#!${pkgs.runtimeShell}
set -euo pipefail
PATH="${command}/bin:$PATH"
cd ${./.}
"${ghcObelisk.obelisk-selftest}/bin/obelisk-selftest" +RTS -N -RTS "$@"
'';
skeleton = pkgs.runCommand "skeleton" {
dir = builtins.filterSource (path: type: builtins.trace path (baseNameOf path != ".obelisk")) ./skeleton;
} ''
ln -s "$dir" "$out"
'';
nullIfAbsent = p: if lib.pathExists p then p else null;
#TODO: Avoid copying files within the nix store. Right now, obelisk-asset-manifest-generate copies files into a big blob so that the android/ios static assets can be imported from there; instead, we should get everything lined up right before turning it into an APK, so that copies, if necessary, only exist temporarily.
processAssets = { src, packageName ? "obelisk-generated-static", moduleName ? "Obelisk.Generated.Static" }: pkgs.runCommand "asset-manifest" {
inherit src;
outputs = [ "out" "haskellManifest" "symlinked" ];
nativeBuildInputs = [ ghcObelisk.obelisk-asset-manifest ];
} ''
set -euo pipefail
touch "$out"
mkdir -p "$symlinked"
obelisk-asset-manifest-generate "$src" "$haskellManifest" ${packageName} ${moduleName} "$symlinked"
'';
compressedJs = frontend: optimizationLevel: pkgs.runCommand "compressedJs" {} ''
mkdir $out
cd $out
# TODO profiling + static shouldn't break and need an ad-hoc workaround like that
ln -s "${haskellLib.justStaticExecutables frontend}/bin/frontend.jsexe/all.js" all.unminified.js
${if optimizationLevel == null then ''
ln -s all.unminified.js all.js
'' else ''
${pkgs.closurecompiler}/bin/closure-compiler --externs "${reflex-platform.ghcjsExternsJs}" -O ${optimizationLevel} --jscomp_warning=checkVars --create_source_map="all.js.map" --source_map_format=V3 --js_output_file="all.js" all.unminified.js
echo "//# sourceMappingURL=all.js.map" >> all.js
''}
'';
serverModules = {
mkBaseEc2 = { nixosPkgs, ... }: {...}: {
imports = [
(nixosPkgs.path + /nixos/modules/virtualisation/amazon-image.nix)
];
ec2.hvm = true;
};
mkDefaultNetworking = { adminEmail, enableHttps, hostName, routeHost, ... }: {...}: {
networking = {
inherit hostName;
firewall.allowedTCPPorts = if enableHttps then [ 80 443 ] else [ 80 ];
};
# `amazon-image.nix` already sets these but if the user provides their own module then
# forgetting these can cause them to lose access to the server!
# https://github.com/NixOS/nixpkgs/blob/fab05f17d15e4e125def4fd4e708d205b41d8d74/nixos/modules/virtualisation/amazon-image.nix#L133-L136
services.openssh.enable = true;
services.openssh.permitRootLogin = "prohibit-password";
security.acme.certs = if enableHttps then {
"${routeHost}".email = adminEmail;
} else {};
};
mkObeliskApp =
{ exe
, routeHost
, enableHttps
, name ? "backend"
, user ? name
, group ? user
, baseUrl ? "/"
, internalPort ? 8000
, backendArgs ? "--port=${toString internalPort}"
, ...
}: {...}: {
services.nginx = {
enable = true;
virtualHosts."${routeHost}" = {
enableACME = enableHttps;
forceSSL = enableHttps;
locations.${baseUrl} = {
proxyPass = "http://127.0.0.1:" + toString internalPort;
proxyWebsockets = true;
};
};
};
systemd.services.${name} = {
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
restartIfChanged = true;
path = [ pkgs.gnutar ];
script = ''
ln -sft . '${exe}'/*
mkdir -p log
exec ./backend ${backendArgs} </dev/null
'';
serviceConfig = {
User = user;
KillMode = "process";
WorkingDirectory = "~";
Restart = "always";
RestartSec = 5;
};
};
users = {
users.${user} = {
description = "${user} service";
home = "/var/lib/${user}";
createHome = true;
isSystemUser = true;
group = group;
};
groups.${group} = {};
};
};
};
inherit mkAssets;
serverExe = backend: frontend: assets: optimizationLevel: version:
pkgs.runCommand "serverExe" {} ''
mkdir $out
set -eux
ln -s "${if profiling then backend else haskellLib.justStaticExecutables backend}"/bin/* $out/
ln -s "${mkAssets assets}" $out/static.assets
ln -s ${mkAssets (compressedJs frontend optimizationLevel)} $out/frontend.jsexe.assets
echo ${version} > $out/version
'';
server = { exe, hostName, adminEmail, routeHost, enableHttps, version, module ? serverModules.mkBaseEc2 }@args:
let
nixos = import (pkgs.path + /nixos);
in nixos {
system = "x86_64-linux";
configuration = {
imports = [
(module { inherit exe hostName adminEmail routeHost enableHttps version; nixosPkgs = pkgs; })
(serverModules.mkDefaultNetworking args)
(serverModules.mkObeliskApp args)
];
};
};
# An Obelisk project is a reflex-platform project with a predefined layout and role for each component
project = base': projectDefinition:
let
projectOut = { system, enableLibraryProfiling ? profiling }: let reflexPlatformProject = (getReflexPlatform { inherit system enableLibraryProfiling; }).project; in reflexPlatformProject (args@{ nixpkgs, ... }:
let
inherit (lib.strings) hasPrefix;
mkProject =
{ android ? null #TODO: Better error when missing
, ios ? null #TODO: Better error when missing
, packages ? {}
, overrides ? _: _: {}
, staticFiles ? null
, tools ? _: []
, shellToolOverrides ? _: _: {}
, withHoogle ? false # Setting this to `true` makes shell reloading far slower
, __closureCompilerOptimizationLevel ? "ADVANCED" # Set this to `null` to skip the closure-compiler step
, __withGhcide ? false
}:
let
allConfig = nixpkgs.lib.makeExtensible (self: {
base = base';
inherit args;
userSettings = {
inherit android ios packages overrides tools shellToolOverrides withHoogle __closureCompilerOptimizationLevel __withGhcide;
staticFiles = if staticFiles == null then self.base + /static else staticFiles;
};
frontendName = "frontend";
backendName = "backend";
commonName = "common";
staticName = "obelisk-generated-static";
staticFilesImpure = let fs = self.userSettings.staticFiles; in if lib.isDerivation fs then fs else toString fs;
processedStatic = processAssets { src = self.userSettings.staticFiles; };
# The packages whose names and roles are defined by this package
predefinedPackages = lib.filterAttrs (_: x: x != null) {
${self.frontendName} = nullIfAbsent (self.base + "/frontend");
${self.commonName} = nullIfAbsent (self.base + "/common");
${self.backendName} = nullIfAbsent (self.base + "/backend");
};
shellPackages = {};
combinedPackages = self.predefinedPackages // self.userSettings.packages // self.shellPackages;
projectOverrides = self': super': {
${self.staticName} = haskellLib.dontHaddock (self'.callCabal2nix self.staticName self.processedStatic.haskellManifest {});
${self.backendName} = haskellLib.addBuildDepend super'.${self.backendName} self'.obelisk-run;
};
totalOverrides = lib.composeExtensions self.projectOverrides self.userSettings.overrides;
privateConfigDirs = ["config/backend"];
injectableConfig = builtins.filterSource (path: _:
!(lib.lists.any (x: hasPrefix (toString self.base + "/" + toString x) (toString path)) self.privateConfigDirs)
);
__androidWithConfig = configPath: {
${if self.userSettings.android == null then null else self.frontendName} = {
executableName = "frontend";
${if builtins.pathExists self.userSettings.staticFiles then "assets" else null} =
nixpkgs.obeliskExecutableConfig.platforms.android.inject
(self.injectableConfig configPath)
self.processedStatic.symlinked;
} // self.userSettings.android;
};
__iosWithConfig = configPath: {
${if self.userSettings.ios == null then null else self.frontendName} = {
executableName = "frontend";
${if builtins.pathExists self.userSettings.staticFiles then "staticSrc" else null} =
nixpkgs.obeliskExecutableConfig.platforms.ios.inject
(self.injectableConfig configPath)
self.processedStatic.symlinked;
} // self.userSettings.ios;
};
shells-ghc = builtins.attrNames (self.predefinedPackages // self.shellPackages);
shells-ghcjs = [
self.frontendName
self.commonName
];
shells-ghcSavedSplices = [
self.commonName
self.frontendName
];
shellToolOverrides = lib.composeExtensions
self.userSettings.shellToolOverrides
(if self.userSettings.__withGhcide
then (import ./haskell-overlays/ghcide.nix)
else (_: _: {})
);
project = reflexPlatformProject ({...}: self.projectConfig);
projectConfig = {
inherit (self) shellToolOverrides;
inherit (self.userSettings) tools withHoogle;
overrides = self.totalOverrides;
packages = self.combinedPackages;
shells = {
${if self.userSettings.android == null && self.userSettings.ios == null then null else "ghcSavedSplices"} =
lib.filter (x: lib.hasAttr x self.combinedPackages) self.shells-ghcSavedSplices;
ghc = lib.filter (x: lib.hasAttr x self.combinedPackages) self.shells-ghc;
ghcjs = lib.filter (x: lib.hasAttr x self.combinedPackages) self.shells-ghcjs;
};
android = self.__androidWithConfig (self.base + "/config");
ios = self.__iosWithConfig (self.base + "/config");
passthru = {
__unstable__.self = allConfig;
inherit (self)
staticFilesImpure processedStatic
__iosWithConfig __androidWithConfig
;
inherit (self.userSettings)
android ios overrides packages shellToolOverrides staticFiles tools withHoogle
__closureCompilerOptimizationLevel
;
};
};
});
in allConfig;
in (mkProject (projectDefinition args)).projectConfig);
mainProjectOut = projectOut { inherit system; };
serverOn = projectInst: version: serverExe
projectInst.ghc.backend
mainProjectOut.ghcjs.frontend
projectInst.passthru.staticFiles
projectInst.passthru.__closureCompilerOptimizationLevel
version;
linuxExe = serverOn (projectOut { system = "x86_64-linux"; });
dummyVersion = "Version number is only available for deployments";
in mainProjectOut // {
__unstable__.profiledObRun = let
profiled = projectOut { inherit system; enableLibraryProfiling = true; };
exeSource = builtins.toFile "ob-run.hs" ''
module Main where
import Control.Exception
import Reflex.Profiled
import System.Environment
import qualified Obelisk.Run
import qualified Frontend
import qualified Backend
main :: IO ()
main = do
args <- getArgs
let port = read $ args !! 0
assets = args !! 1
profileFile = (args !! 2) <> ".rprof"
Obelisk.Run.run port (Obelisk.Run.runServeAsset assets) Backend.backend Frontend.frontend `finally` writeProfilingData profileFile
'';
in nixpkgs.runCommand "ob-run" {
buildInputs = [ (profiled.ghc.ghcWithPackages (p: [ p.backend p.frontend])) ];
} ''
mkdir -p $out/bin/
ghc -x hs -prof -fno-prof-auto -threaded ${exeSource} -o $out/bin/ob-run
'';
linuxExeConfigurable = linuxExe;
linuxExe = linuxExe dummyVersion;
exe = serverOn mainProjectOut dummyVersion;
server = args@{ hostName, adminEmail, routeHost, enableHttps, version, module ? serverModules.mkBaseEc2 }:
server (args // { exe = linuxExe version; });
obelisk = import (base' + "/.obelisk/impl") {};
};
haskellPackageSets = {
inherit (reflex-platform) ghc ghcjs;
};
}