Add a precompilation workload

Other notable changes:
- Moved `create_profile()` into init.jl so we can use it in `init()` and the
  precompilation workload.
- Added an option to not capture stdin, because during precompilation it's not
  possible to redirect stdin.

Project.toml

@@ -12,9 +12,11 @@ Logging = "56ddb016-857b-54e1-b83d-db4d58db5568"
 Markdown = "d6f4376e-aef5-505a-96c1-9c027394607a"
 MbedTLS = "739be429-bea8-5141-9913-cc70e7f3736d"
 Pkg = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
+PrecompileTools = "aea7be01-6a6a-4083-8856-8a6e6704d82a"
 Printf = "de0858da-6303-5e67-8744-51eddeeeb8d7"
 REPL = "3fa0cd96-eef1-5676-8a61-b3b8758bbffb"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
+Sockets = "6462fe0b-24de-5631-8697-dd941f90decc"
 SoftGlobalScope = "b85f4697-e234-5449-a836-ec8e2f98b302"
 UUIDs = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
 ZMQ = "c2297ded-f4af-51ae-bb23-16f91089e4e1"
@@ -29,9 +31,11 @@ Logging = "1"
 Markdown = "1"
 MbedTLS = "0.5,0.6,0.7,1"
 Pkg = "1"
+PrecompileTools = "1.2.1"
 Printf = "1"
 REPL = "1"
 Random = "1"
+Sockets = "1"
 SoftGlobalScope = "1"
 UUIDs = "1"
 ZMQ = "1.3"

src/IJulia.jl

@@ -86,6 +86,7 @@ end
     n::Int = 0
     capture_stdout::Bool = true
     capture_stderr::Bool = !IJULIA_DEBUG
+    capture_stdin::Bool = true
 
     postexecute_hooks::Vector{Function} = Function[]
     preexecute_hooks::Vector{Function} = Function[]
@@ -168,10 +169,15 @@ function Base.close(kernel::Kernel)
         close(kernel.read_stderr[])
         wait(kernel.watch_stderr_task[])
     end
-    redirect_stdin(orig_stdin[])
+    if kernel.capture_stdin
+        redirect_stdin(orig_stdin[])
+    end
 
     # Reset the logger so that @log statements work and pop the InlineDisplay
-    Logging.global_logger(orig_logger[])
+    if isassigned(orig_logger)
+        # orig_logger seems to not be set during precompilation
+        Logging.global_logger(orig_logger[])
+    end
     popdisplay()
 
     # Close all sockets
@@ -456,5 +462,6 @@ include("execute_request.jl")
 include("handlers.jl")
 include("heartbeat.jl")
 include("inline.jl")
+include("precompile.jl")
 
 end # IJulia

src/init.jl

@@ -1,4 +1,5 @@
 import Random: seed!
+import Sockets
 import Logging
 import Logging: AbstractLogger, ConsoleLogger
 
@@ -30,6 +31,35 @@ end
     const minirepl = Ref{MiniREPL}()
 end
 
+function getports(port_hint, n)
+    ports = Int[]
+
+    for i in 1:n
+        port, server = Sockets.listenany(Sockets.localhost, port_hint)
+        close(server)
+        push!(ports, port)
+        port_hint = port + 1
+    end
+
+    return ports
+end
+
+function create_profile(port_hint=8080; key=uuid4())
+    ports = getports(port_hint, 5)
+
+    Dict(
+        "transport" => "tcp",
+        "ip" => "127.0.0.1",
+        "control_port" => ports[1],
+        "shell_port" => ports[2],
+        "stdin_port" => ports[3],
+        "hb_port" => ports[4],
+        "iopub_port" => ports[5],
+        "signature_scheme" => "hmac-sha256",
+        "key" => key
+    )
+end
+
 """
     init(args, kernel)
 
@@ -48,16 +78,7 @@ function init(args, kernel, profile=nothing)
     else
         # generate profile and save
         let port0 = 5678
-            merge!(kernel.profile, Dict{String,Any}(
-                "ip" => "127.0.0.1",
-                "transport" => "tcp",
-                "stdin_port" => port0,
-                "control_port" => port0+1,
-                "hb_port" => port0+2,
-                "shell_port" => port0+3,
-                "iopub_port" => port0+4,
-                "key" => uuid4()
-            ))
+            merge!(kernel.profile, create_profile(port0))
             fname = "profile-$(getpid()).json"
             kernel.connection_file = "$(pwd())/$fname"
             println("connect ipython with --existing $(kernel.connection_file)")
@@ -108,7 +129,10 @@ function init(args, kernel, profile=nothing)
         kernel.read_stderr[], = redirect_stderr()
         redirect_stderr(IJuliaStdio(stderr, kernel, "stderr"))
     end
-    redirect_stdin(IJuliaStdio(stdin, kernel, "stdin"))
+    if kernel.capture_stdin
+        redirect_stdin(IJuliaStdio(stdin, kernel, "stdin"))
+    end
+
     @static if VERSION < v"1.11"
         minirepl[] = MiniREPL(TextDisplay(stdout))
     end

src/msg.jl

@@ -86,6 +86,16 @@ function recv_ipython(socket, kernel)
         if signature != hmac(header, parent_header, metadata, content, kernel)
             error("Invalid HMAC signature") # What should we do here?
         end
+
+        # Note: don't remove these lines, they're useful for creating a
+        # precompilation workload.
+        # @show idents
+        # @show signature
+        # @show header
+        # @show parent_header
+        # @show metadata
+        # @show content
+
         m = Msg(idents, JSON.parse(header), JSON.parse(content), JSON.parse(parent_header), JSON.parse(metadata))
         @vprintln("RECEIVED $m")
         return m

src/precompile.jl

@@ -0,0 +1,69 @@
+import PrecompileTools: @compile_workload
+
+# This key is used by the tests and precompilation workload to keep some
+# consistency in the message signatures.
+const _TEST_KEY = "a0436f6c-1916-498b-8eb9-e81ab9368e84"
+
+# How to update the precompilation workload:
+# 1. Uncomment the `@show` expressions in `recv_ipython()` in msg.jl.
+# 2. Copy this workload into tests/kernel.jl and update as desired:
+#
+#     Kernel(profile; capture_stdout=false, capture_stderr=false) do kernel
+#         jupyter_client(profile) do client
+#             kernel_info(client)
+#             execute(client, "42")
+#             execute(client, "error(42)")
+#         end
+#     end
+#
+# 3. When the above runs it will print out the contents of the received messages
+#    as strings. You can copy these verbatim into the precompilation workload
+#    below. Note that if you modify any step of the workload you will need to
+#    update *all* the messages to ensure they have the right parent
+#    headers/signatures.
+@compile_workload begin
+    profile = create_profile(45_000; key=_TEST_KEY)
+
+    Kernel(profile; capture_stdout=false, capture_stderr=false, capture_stdin=false) do kernel
+        # Connect as a client to the kernel
+        requests_socket = ZMQ.Socket(ZMQ.DEALER)
+        ip = profile["ip"]
+        port = profile["shell_port"]
+        ZMQ.connect(requests_socket, "tcp://$(ip):$(port)")
+
+        # kernel_info
+        idents = ["d2bd8e47-b2c9cd130d2967a19f52c1a3"]
+        signature = "3c4f523a0e8b80e5b3e35756d75f62d12b851e1fd67c609a9119872e911f83d2"
+        header = "{\"msg_id\": \"d2bd8e47-b2c9cd130d2967a19f52c1a3_3534705_0\", \"msg_type\": \"kernel_info_request\", \"username\": \"james\", \"session\": \"d2bd8e47-b2c9cd130d2967a19f52c1a3\", \"date\": \"2025-02-20T22:29:47.616834Z\", \"version\": \"5.4\"}"
+        parent_header = "{}"
+        metadata = "{}"
+        content = "{}"
+
+        ZMQ.send_multipart(requests_socket, [only(idents), "<IDS|MSG>", signature, header, parent_header, metadata, content])
+        ZMQ.recv_multipart(requests_socket, String)
+
+        # Execute `42`
+        idents = ["d2bd8e47-b2c9cd130d2967a19f52c1a3"]
+        signature = "758c034ba5efb4fd7fd5a5600f913bc634739bf6a2c1e1d87e88b008706337bc"
+        header = "{\"msg_id\": \"d2bd8e47-b2c9cd130d2967a19f52c1a3_3534705_1\", \"msg_type\": \"execute_request\", \"username\": \"james\", \"session\": \"d2bd8e47-b2c9cd130d2967a19f52c1a3\", \"date\": \"2025-02-20T22:29:49.835131Z\", \"version\": \"5.4\"}"
+        parent_header = "{}"
+        metadata = "{}"
+        content = "{\"code\": \"42\", \"silent\": false, \"store_history\": true, \"user_expressions\": {}, \"allow_stdin\": true, \"stop_on_error\": true}"
+
+        ZMQ.send_multipart(requests_socket, [only(idents), "<IDS|MSG>", signature, header, parent_header, metadata, content])
+        ZMQ.recv_multipart(requests_socket, String)
+
+        # Execute `error(42)`
+        idents = ["d2bd8e47-b2c9cd130d2967a19f52c1a3"]
+        signature = "953702763b65d9b0505f34ae0eb195574b9c2c65eebedbfa8476150133649801"
+        header = "{\"msg_id\": \"d2bd8e47-b2c9cd130d2967a19f52c1a3_3534705_2\", \"msg_type\": \"execute_request\", \"username\": \"james\", \"session\": \"d2bd8e47-b2c9cd130d2967a19f52c1a3\", \"date\": \"2025-02-20T22:29:50.320836Z\", \"version\": \"5.4\"}"
+        parent_header = "{}"
+        metadata = "{}"
+        content = "{\"code\": \"error(42)\", \"silent\": false, \"store_history\": true, \"user_expressions\": {}, \"allow_stdin\": true, \"stop_on_error\": true}"
+
+        ZMQ.send_multipart(requests_socket, [only(idents), "<IDS|MSG>", signature, header, parent_header, metadata, content])
+        ZMQ.recv_multipart(requests_socket, String)
+
+        close(requests_socket)
+    end
+end

test/Project.toml

@@ -10,3 +10,4 @@ JSON = "682c06a0-de6a-54ab-a142-c8b1cf79cde6"
 PythonCall = "6099a3de-0909-46bc-b1f4-468b9a2dfc0d"
 Sockets = "6462fe0b-24de-5631-8697-dd941f90decc"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+ZMQ = "c2297ded-f4af-51ae-bb23-16f91089e4e1"

test/kernel.jl

@@ -14,6 +14,7 @@ using Test
 import Sockets
 import Sockets: listenany
 
+import ZMQ
 import PythonCall
 import PythonCall: Py, pyimport, pyconvert, pytype, pystr
 
@@ -31,35 +32,6 @@ import IJulia: Kernel
 import IJulia: ans, In, Out
 
 
-function getports(port_hint, n)
-    ports = Int[]
-
-    for i in 1:n
-        port, server = listenany(Sockets.localhost, port_hint)
-        close(server)
-        push!(ports, port)
-        port_hint = port + 1
-    end
-
-    return ports
-end
-
-function create_profile(port_hint=8080)
-    ports = getports(port_hint, 5)
-
-    Dict(
-        "transport" => "tcp",
-        "ip" => "127.0.0.1",
-        "control_port" => ports[1],
-        "shell_port" => ports[2],
-        "stdin_port" => ports[3],
-        "hb_port" => ports[4],
-        "iopub_port" => ports[5],
-        "signature_scheme" => "hmac-sha256",
-        "key" => "a0436f6c-1916-498b-8eb9-e81ab9368e84"
-    )
-end
-
 function test_py_get!(get_func, result)
     try
         result[] = get_func(timeout=0)
@@ -156,7 +128,7 @@ function jupyter_client(f, profile)
 end
 
 @testset "Kernel" begin
-    profile = create_profile()
+    profile = IJulia.create_profile(; key=IJulia._TEST_KEY)
     profile_kwargs = Dict([Symbol(key) => value for (key, value) in profile])
     profile_kwargs[:key] = pystr(profile_kwargs[:key]).encode()