param_service: Split out from the unused OHOS Init service

In OpenHarmony 3.0 Param Service is a part of the whole Init system. This
service is required by many other services. Therefore we have to split out
the service as an independent from Init when Init is not used.

Signed-off-by: Robert Drab <robert.drab@huawei.com>

Closes https://gitlab.eclipse.org/eclipse/oniro-core/meta-openharmony/-/issues/28
Closes https://gitlab.eclipse.org/eclipse/oniro-core/meta-openharmony/-/issues/31

recipes-openharmony/openharmony/openharmony-standard-3.0/param_service-Add-to-build-system.patch

+# SPDX-FileCopyrightText: Huawei Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+Patch for //base/startup/init_lite
+
+param_service: Add to build system
+
+In OpenHarmony 3.0 Param Service is a part of the whole Init system. This
+service is required by many other services. Therefore we have to split out
+the service as an independent from Init when Init is not used.
+
+Signed-off-by: Robert Drab <robert.drab@huawei.com>
+Upstream-Status: Inappropriate
+
+diff --git a/services/BUILD.gn b/services/BUILD.gn
+index 1994c2ef..e094f7ce 100644
+--- a/services/BUILD.gn
++++ b/services/BUILD.gn
+@@ -85,6 +85,25 @@ if (defined(ohos_lite)) {
+ } else {
+   import("//build/ohos.gni")
+ 
++  ohos_executable("param_service") {
++    sources = [ "param/src/param_service_main.c" ]
++    include_dirs = [
++      "//base/startup/init_lite/services/include/param",
++      "//base/startup/init_lite/services/log",
++      "//third_party/cJSON",
++    ]
++    deps = [
++      "//base/startup/init_lite/services/log:init_log",
++      "//base/startup/init_lite/services/param:paramservice",
++    ]
++    install_images = [
++      "system",
++      "updater",
++    ]
++    install_enable = true
++    part_name = "startup_l2"
++  }
++
+   ohos_executable("init") {
+     sources = [
+       "src/device.c",
+@@ -132,6 +151,7 @@ if (defined(ohos_lite)) {
+ 
+   group("startup_init") {
+     deps = [
++      ":param_service",
+       ":init",
+       ":init_etc",
+       "//base/startup/init_lite/interfaces/innerkits/socket:libsocket",
+@@ -180,7 +200,7 @@ if (defined(ohos_lite)) {
+ 
+   ohos_prebuilt_etc("ohos.para") {
+     source = "//base/startup/init_lite/services/etc/ohos.para"
+-    part_name = "init"
++    part_name = "startup_l2"
+   }
+ 
+   group("init_etc") {
+diff --git a/services/param/BUILD.gn b/services/param/BUILD.gn
+index 07e1d278..ba420b66 100644
+--- a/services/param/BUILD.gn
++++ b/services/param/BUILD.gn
+@@ -83,7 +83,7 @@ ohos_executable("getparam") {
+     "//third_party/cJSON:cjson_static",
+   ]
+   install_enable = true
+-  part_name = "init"
++  part_name = "startup_l2"
+ }
+ 
+ ohos_executable("setparam") {
+@@ -100,5 +100,5 @@ ohos_executable("setparam") {
+     "//third_party/cJSON:cjson_static",
+   ]
+   install_enable = true
+-  part_name = "init"
++  part_name = "startup_l2"
+ }
+diff --git a/services/param/service/param_service.c b/services/param/service/param_service.c
+index cd5d93be..03a10ae0 100644
+--- a/services/param/service/param_service.c
++++ b/services/param/service/param_service.c
+@@ -131,7 +131,11 @@ static int ProcessParamSet(const RequestMsg *msg)
+     ret = WritePersistParam(info[0].value, info[1].value);
+     PARAM_CHECK(ret == 0, return ret, "Failed to set param");
+     // notify event to process trigger
++// TODO: add some flag or something instead of if 0
++// The following call is a part of OpenHarmony init system
++#if 0
+     PostTrigger(EVENT_PROPERTY, msg->content, msg->contentSize);
++#endif
+     return 0;
+ }
+ 
+@@ -267,7 +271,11 @@ int SystemWriteParam(const char *name, const char *value)
+     PARAM_CHECK(ret == 0, return ret, "Failed to set persist param %s", name);
+ 
+     // notify event to process trigger
++// TODO: add some flag or something instead of if 0
++// The following call is a part of OpenHarmony init system
++#if 0
+     PostParamTrigger(name, value);
++#endif
+     return ret;
+ }
+ 

recipes-openharmony/openharmony/openharmony-standard-3.0/param_service-Add-to-startup-l2-part.patch

+# SPDX-FileCopyrightText: Huawei Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+Patch for //base/startup/appspawn_standard
+
+appspawn_standard: Add param_service to startup l2 part
+
+In OpenHarmony 3.0 param service is a part of init part which is we don not
+use and therefore we have to add it to a different part.
+
+Signed-off-by: Robert Drab <robert.drab@huawei.com>
+Upstream-Status: Inappropriate
+
+diff --git a/ohos.build b/ohos.build
+index 650790f..85b3bde 100644
+--- a/ohos.build
++++ b/ohos.build
+@@ -9,7 +9,11 @@
+         "//base/startup/appspawn_standard:appspawn.rc",
+         "//base/startup/syspara_lite/interfaces/innerkits/native/syspara:syspara",
+         "//base/startup/syspara_lite/interfaces/kits/js:deviceinfo",
+-        "//base/startup/syspara_lite/interfaces/kits/js:systemparameter"
++        "//base/startup/syspara_lite/interfaces/kits/js:systemparameter",
++        "//base/startup/init_lite/services:param_service",
++        "//base/startup/init_lite/services:ohos.para",
++        "//base/startup/init_lite/services/param:getparam",
++        "//base/startup/init_lite/services/param:setparam"
+       ],
+       "inner_kits": [
+           {

recipes-openharmony/openharmony/openharmony-standard-3.0/param_service.c-Fix-stopping-param_service.patch

+# SPDX-FileCopyrightText: Huawei Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+Patch for //base/startup/init_lite
+
+param_service.c: Fix stopping param_service
+
+StopParamService() have to be called from the uv_loop context to be able to
+successfully stop the uv_loop. To achieve that we need an uv_idle callback.
+
+Signed-off-by: Robert Drab <robert.drab@huawei.com>
+Upstream-Status: Pending
+
+diff --git a/services/param/service/param_service.c b/services/param/service/param_service.c
+index cd5d93be..6634fa3d 100644
+--- a/services/param/service/param_service.c
++++ b/services/param/service/param_service.c
+@@ -241,12 +241,36 @@ void StopParamService()
+     PARAM_LOGI("StopParamService.");
+ }
+ 
++/*
++ * uv_stop() must be called from the uv_loop context and therefore
++ * StopParamService() cannot do it's job when called from the signal handler.
++ * We need a uv_idle callback that will call StopParamService() which calls
++ * uv_stop() from the uv_loop context to actually stop the param service loop.
++ */
++int g_paramService_asyncStopRequest = 0;
++
++int ParamServiceAsyncStopRequest() {
++    g_paramService_asyncStopRequest = 0;
++    return 0;
++}
++
++void ParamServiceLoopIdleCallback(uv_idle_t *handle) {
++    if (g_paramService_asyncStopRequest) {
++        PARAM_LOGI("%s(): %d Stopping param service...", __FUNCTION__, __LINE__);
++        StopParamService();
++    }
++}
++
+ int StartParamService()
+ {
+     PARAM_LOGI("StartParamService.");
+     uv_fs_t req;
+     uv_fs_unlink(uv_default_loop(), &req, PIPE_NAME, NULL);
+ 
++    uv_idle_t idler;
++    uv_idle_init(uv_default_loop(), &idler);
++    uv_idle_start(&idler, ParamServiceLoopIdleCallback);
++
+     uv_pipe_t pipeServer;
+     int ret = uv_pipe_init(uv_default_loop(), &pipeServer, 0);
+     PARAM_CHECK(ret == 0, return ret, "Failed to uv_pipe_init %d", ret);
+diff --git a/services/include/param/init_param.h b/services/include/param/init_param.h
+index 73a06795..4574cbaa 100644
+--- a/services/include/param/init_param.h
++++ b/services/include/param/init_param.h
+@@ -51,6 +51,14 @@ int StartParamService();
+  */
+ void StopParamService();
+ 
++/**
++ * ParamServiceAsyncStopRequest interface
++ * Allows stopping ParamService from outside event loop context,
++ * e.g. from signal handler
++ *
++ */
++int ParamServiceAsyncStopRequest(void);
++
+ /**
+  * Init 接口
+  * 加载默认的参数值

recipes-openharmony/openharmony/openharmony-standard-3.0/param_service_main.c

+/*
+ * SPDX-FileCopyrightText: Huawei Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <init_log.h>
+#include <init_param.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include <signal.h>
+
+void sig_handler(int signum) {
+    INIT_LOGI("Requesting param service to stop...");
+    ParamServiceAsyncStopRequest();
+}
+
+char *parse_args(int argc, char **argv) {
+    char *fpath = NULL;
+
+    if (argc == 2 && argv[1]) {
+        if (access(argv[1], R_OK) == 0) {
+            fpath = argv[1];
+        }
+    }
+
+    return fpath;
+}
+
+int main(int argc, char **argv)
+{
+    char *params_fpath = "/system/etc/ohos.para";
+
+    if (argc > 1)
+        params_fpath = parse_args(argc, argv);
+
+    if (!params_fpath) {
+        INIT_LOGI("Invalid params file path!");
+        return -EINVAL;
+    }
+
+    InitParamService();
+    int ret = LoadDefaultParams(params_fpath);
+    if (ret) {
+        INIT_LOGE("Failed to load default params! Error code: %d", ret);
+    }
+    ret = LoadPersistParams();
+    if (ret) {
+        INIT_LOGE("Failed to load persist params! Error code: %d", ret);
+    }
+
+    struct sigaction action = { 0 };
+    action.sa_handler = sig_handler;
+
+    sigaction(SIGTERM, &action, NULL);
+    sigaction(SIGINT, &action, NULL);
+    sigaction(SIGHUP, &action, NULL);
+
+    // Following call spins up libuv event loop that will keep service running
+    INIT_LOGI("Starting param service...");
+    StartParamService();
+    INIT_LOGI("Param service stopped.");
+
+    return 0;
+}

recipes-openharmony/openharmony/openharmony-standard_3.0.bb

@@ -61,6 +61,11 @@ SRC_URI += "file://appspawn-procps.patch;patchdir=${S}/base/startup/appspawn_sta
 SRC_URI += "file://base_startup_appspawn_standard-disable-longProcName-resetting.patch;patchdir=${S}/base/startup/appspawn_standard"
 SRC_URI += "file://test_xts_acts-Align-tests-list-with-mandatory-set.patch;patchdir=${S}/test/xts/acts"
 
+SRC_URI += "file://param_service_main.c;subdir=${S}/base/startup/init_lite/services/param/src"
+SRC_URI += "file://param_service-Add-to-build-system.patch;patchdir=${S}/base/startup/init_lite"
+SRC_URI += "file://param_service.c-Fix-stopping-param_service.patch;patchdir=${S}/base/startup/init_lite"
+SRC_URI += "file://param_service-Add-to-startup-l2-part.patch;patchdir=${S}/base/startup/appspawn_standard"
+
 inherit python3native gn_base ptest
 
 B = "${S}/out/ohos-arm-release"