From patchwork Thu Oct 21 14:24:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Hostetler X-Patchwork-Id: 12575191 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5337BC433EF for ; Thu, 21 Oct 2021 14:25:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 38D2F61221 for ; Thu, 21 Oct 2021 14:25:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231425AbhJUO1m (ORCPT ); Thu, 21 Oct 2021 10:27:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38328 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230372AbhJUO1a (ORCPT ); Thu, 21 Oct 2021 10:27:30 -0400 Received: from mail-wr1-x430.google.com (mail-wr1-x430.google.com [IPv6:2a00:1450:4864:20::430]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F3668C0613B9 for ; Thu, 21 Oct 2021 07:25:13 -0700 (PDT) Received: by mail-wr1-x430.google.com with SMTP id m22so1521152wrb.0 for ; Thu, 21 Oct 2021 07:25:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=message-id:in-reply-to:references:from:date:subject:fcc :content-transfer-encoding:mime-version:to:cc; bh=LDTU64WFptNk/iCaHfjIEBqLqjrKE0oTr84qceM5FAQ=; b=LBBZk1yyk8W/OmNCQX58j6OFLPyU7pFzvktuRPnahv53XcJY/2k4/CooKNsaWuIZoE 0EQveBjDY7SEFxXs8hkdrQ4l+x+MaQAnWoUphaAHQxC5kCSpQewoUD6jCQ+igt0KnycF aqLPWjqLwHIc6CUSShctYsfybR6ypvsHGI4gKMxW37Oxt533yS7kbSP12luhpMXEOidq XhSw38sx3CLoNW24SZ3z44bNrFQ+fgh5/QslstNSIB94TttQ0Ud3Sj0dc1eurREch3C0 QUfX+yRLElJzFe3H+xvIc4YaJLA2BtDtzDAX6ODbS9UUpZ5YU9hogtEgaAgDh5nnnsd8 ephg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:in-reply-to:references:from:date :subject:fcc:content-transfer-encoding:mime-version:to:cc; bh=LDTU64WFptNk/iCaHfjIEBqLqjrKE0oTr84qceM5FAQ=; b=CEBMDj7f7WfE/mblAmH6NDn82LE9nNuSnNFhbyHgQ69yQtsdhSAKNjbgsIFBc6H/3g RrEG530HBXlP0VFnQxigl7DZNk/u2yV55mi/LmqFWMLmtfN+6Pr7cUXHpHxKsVl9tikQ NHxtmZaoEunnBydnw29mpkZj+iojvHnPjaMmbVPQsKjDQDtiBoSmSILkSN9JVXfY/G9U AK3J86NYfHUCWRVP1cBa1AWlyj6XwtBaWJIE6078t5iHqEPRWoh5ISZfQPoYl0EbNXJB XxsNGPvhCvPzQMtps3TyHqUF2nItwGt1ABMKQ+Ia5xvTVNMZ5g+6F88/XOFXlCXj//CD DtRA== X-Gm-Message-State: AOAM533M8FbKtmPMFJicNX5OV0Yzq5WbnYjgETzOP7XREU7WGygLt7hK Kr8wkX7BssjVFAfI/n2Zz8fZQvuUS3Q= X-Google-Smtp-Source: ABdhPJwjWaUdKZ/qj/O/7JKu3bBcBFp6IGC0gua1/cTdZmcDdVZ2gE5PO1x8Z5EWZz5D818LNDQTZw== X-Received: by 2002:a5d:5989:: with SMTP id n9mr4273917wri.8.1634826312529; Thu, 21 Oct 2021 07:25:12 -0700 (PDT) Received: from [127.0.0.1] ([13.74.141.28]) by smtp.gmail.com with ESMTPSA id f24sm4992060wmb.33.2021.10.21.07.25.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Oct 2021 07:25:12 -0700 (PDT) Message-Id: <82f176921282d13daee08bde7244df5d22e01ce6.1634826309.git.gitgitgadget@gmail.com> In-Reply-To: References: Date: Thu, 21 Oct 2021 14:24:42 +0000 Subject: [PATCH v4 02/29] fsmonitor-ipc: create client routines for git-fsmonitor--daemon Fcc: Sent MIME-Version: 1.0 To: git@vger.kernel.org Cc: Jeff Hostetler , Jeff Hostetler , Jeff Hostetler Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org From: Jeff Hostetler From: Jeff Hostetler Create fsmonitor_ipc__*() client routines to spawn the built-in file system monitor daemon and send it an IPC request using the `Simple IPC` API. Stub in empty fsmonitor_ipc__*() functions for unsupported platforms. Signed-off-by: Jeff Hostetler --- Makefile | 1 + fsmonitor-ipc.c | 176 ++++++++++++++++++++++++++++++++++++++++++++++++ fsmonitor-ipc.h | 48 +++++++++++++ 3 files changed, 225 insertions(+) create mode 100644 fsmonitor-ipc.c create mode 100644 fsmonitor-ipc.h diff --git a/Makefile b/Makefile index 381bed2c1d2..d51fd8b33ce 100644 --- a/Makefile +++ b/Makefile @@ -897,6 +897,7 @@ LIB_OBJS += fetch-pack.o LIB_OBJS += fmt-merge-msg.o LIB_OBJS += fsck.o LIB_OBJS += fsmonitor.o +LIB_OBJS += fsmonitor-ipc.o LIB_OBJS += gettext.o LIB_OBJS += gpg-interface.o LIB_OBJS += graph.o diff --git a/fsmonitor-ipc.c b/fsmonitor-ipc.c new file mode 100644 index 00000000000..ccc32d2a17e --- /dev/null +++ b/fsmonitor-ipc.c @@ -0,0 +1,176 @@ +#include "cache.h" +#include "fsmonitor.h" +#include "simple-ipc.h" +#include "fsmonitor-ipc.h" +#include "run-command.h" +#include "strbuf.h" +#include "trace2.h" + +#ifdef HAVE_FSMONITOR_DAEMON_BACKEND + +int fsmonitor_ipc__is_supported(void) +{ + return 1; +} + +GIT_PATH_FUNC(fsmonitor_ipc__get_path, "fsmonitor--daemon.ipc") + +enum ipc_active_state fsmonitor_ipc__get_state(void) +{ + return ipc_get_active_state(fsmonitor_ipc__get_path()); +} + +static int spawn_daemon(void) +{ + const char *args[] = { "fsmonitor--daemon", "start", NULL }; + + return run_command_v_opt_tr2(args, RUN_COMMAND_NO_STDIN | RUN_GIT_CMD, + "fsmonitor"); +} + +int fsmonitor_ipc__send_query(const char *since_token, + struct strbuf *answer) +{ + int ret = -1; + int tried_to_spawn = 0; + enum ipc_active_state state = IPC_STATE__OTHER_ERROR; + struct ipc_client_connection *connection = NULL; + struct ipc_client_connect_options options + = IPC_CLIENT_CONNECT_OPTIONS_INIT; + const char *tok = since_token ? since_token : ""; + size_t tok_len = since_token ? strlen(since_token) : 0; + + options.wait_if_busy = 1; + options.wait_if_not_found = 0; + + trace2_region_enter("fsm_client", "query", NULL); + trace2_data_string("fsm_client", NULL, "query/command", tok); + +try_again: + state = ipc_client_try_connect(fsmonitor_ipc__get_path(), &options, + &connection); + + switch (state) { + case IPC_STATE__LISTENING: + ret = ipc_client_send_command_to_connection( + connection, tok, tok_len, answer); + ipc_client_close_connection(connection); + + trace2_data_intmax("fsm_client", NULL, + "query/response-length", answer->len); + + if (fsmonitor_is_trivial_response(answer)) + trace2_data_intmax("fsm_client", NULL, + "query/trivial-response", 1); + + goto done; + + case IPC_STATE__NOT_LISTENING: + case IPC_STATE__PATH_NOT_FOUND: + if (tried_to_spawn) + goto done; + + tried_to_spawn++; + if (spawn_daemon()) + goto done; + + /* + * Try again, but this time give the daemon a chance to + * actually create the pipe/socket. + * + * Granted, the daemon just started so it can't possibly have + * any FS cached yet, so we'll always get a trivial answer. + * BUT the answer should include a new token that can serve + * as the basis for subsequent requests. + */ + options.wait_if_not_found = 1; + goto try_again; + + case IPC_STATE__INVALID_PATH: + ret = error(_("fsmonitor_ipc__send_query: invalid path '%s'"), + fsmonitor_ipc__get_path()); + goto done; + + case IPC_STATE__OTHER_ERROR: + default: + ret = error(_("fsmonitor_ipc__send_query: unspecified error on '%s'"), + fsmonitor_ipc__get_path()); + goto done; + } + +done: + trace2_region_leave("fsm_client", "query", NULL); + + return ret; +} + +int fsmonitor_ipc__send_command(const char *command, + struct strbuf *answer) +{ + struct ipc_client_connection *connection = NULL; + struct ipc_client_connect_options options + = IPC_CLIENT_CONNECT_OPTIONS_INIT; + int ret; + enum ipc_active_state state; + const char *c = command ? command : ""; + size_t c_len = command ? strlen(command) : 0; + + strbuf_reset(answer); + + options.wait_if_busy = 1; + options.wait_if_not_found = 0; + + state = ipc_client_try_connect(fsmonitor_ipc__get_path(), &options, + &connection); + if (state != IPC_STATE__LISTENING) { + die("fsmonitor--daemon is not running"); + return -1; + } + + ret = ipc_client_send_command_to_connection(connection, c, c_len, + answer); + ipc_client_close_connection(connection); + + if (ret == -1) { + die("could not send '%s' command to fsmonitor--daemon", c); + return -1; + } + + return 0; +} + +#else + +/* + * A trivial implementation of the fsmonitor_ipc__ API for unsupported + * platforms. + */ + +int fsmonitor_ipc__is_supported(void) +{ + return 0; +} + +const char *fsmonitor_ipc__get_path(void) +{ + return NULL; +} + +enum ipc_active_state fsmonitor_ipc__get_state(void) +{ + return IPC_STATE__OTHER_ERROR; +} + +int fsmonitor_ipc__send_query(const char *since_token, + struct strbuf *answer) +{ + return -1; +} + +int fsmonitor_ipc__send_command(const char *command, + struct strbuf *answer) +{ + return -1; +} + +#endif diff --git a/fsmonitor-ipc.h b/fsmonitor-ipc.h new file mode 100644 index 00000000000..b6a7067c3af --- /dev/null +++ b/fsmonitor-ipc.h @@ -0,0 +1,48 @@ +#ifndef FSMONITOR_IPC_H +#define FSMONITOR_IPC_H + +#include "simple-ipc.h" + +/* + * Returns true if built-in file system monitor daemon is defined + * for this platform. + */ +int fsmonitor_ipc__is_supported(void); + +/* + * Returns the pathname to the IPC named pipe or Unix domain socket + * where a `git-fsmonitor--daemon` process will listen. This is a + * per-worktree value. + * + * Returns NULL if the daemon is not supported on this platform. + */ +const char *fsmonitor_ipc__get_path(void); + +/* + * Try to determine whether there is a `git-fsmonitor--daemon` process + * listening on the IPC pipe/socket. + */ +enum ipc_active_state fsmonitor_ipc__get_state(void); + +/* + * Connect to a `git-fsmonitor--daemon` process via simple-ipc + * and ask for the set of changed files since the given token. + * + * Spawn a daemon process in the background if necessary. + * + * Returns -1 on error; 0 on success. + */ +int fsmonitor_ipc__send_query(const char *since_token, + struct strbuf *answer); + +/* + * Connect to a `git-fsmonitor--daemon` process via simple-ipc and + * send a command verb. If no daemon is available, we DO NOT try to + * start one. + * + * Returns -1 on error; 0 on success. + */ +int fsmonitor_ipc__send_command(const char *command, + struct strbuf *answer); + +#endif /* FSMONITOR_IPC_H */