Importing agl-service-taskmanager code

The service queries /proc for system statistics data and
collects data for all processes currently running
on the system. The data for each consists of process name,
process ID, user, system CPU usage, user CPU usage, memory and state.
The data is then converted to JSON and sent to the requesting app.

v1
 - removed trailing whitespaces
 - added description in the README file
 - removed URL from config.cmake

v2
 - added project URL to config.cmake

Change-Id: I7670c239191ee9b7333d5a383f1b2fcf6bc774c1
Signed-off-by: Yordan Dimitrov <y.dimitrov.14@gmail.com>

1 files changed, 179 insertions, 0 deletions

diff --git a/binding/task-manager-binding.c b/binding/task-manager-binding.c
new file mode 100644
index 0000000..43c9ee3
--- /dev/null
+++ b/binding/task-manager-binding.c
@@ -0,0 +1,179 @@
+#include <proc/readproc.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <proc/sysinfo.h>
+#include <math.h>
+#include <unistd.h>
+#include <json-c/json.h>
+
+#define AFB_BINDING_VERSION 2
+#include <afb/afb-binding.h>
+
+void get_process_list(struct afb_req request);
+struct pstat* fill_pstat(proc_t *proc_info);
+struct cpu_percentage* cpu_calculate(struct pstat*, struct pstat*);
+struct process_container* process_container_constr(char* process_name, int euid, struct pstat *pstat_values);
+static const struct afb_binding_interface *interface;
+static struct afb_event event;
+
+struct pstat {
+	long long unsigned int utime_ticks;
+	long long unsigned int cutime_ticks;
+	long long unsigned int stime_ticks;
+	long long unsigned int cstime_ticks;
+	long unsigned int cpu_total_time;
+};
+
+struct cpu_percentage {
+	double ucpu_usage;
+	double scpu_usage;
+};
+
+struct process_container {
+	char *process_name;
+	// int tid;
+	int euid;
+	struct pstat *pstat_values;
+};
+
+void get_process_list(struct afb_req request){
+
+	int seconds = 1, page_size;
+	page_size = getpagesize();
+	struct pstat *last_pstat_values, *now_pstat_values;
+	struct cpu_percentage *cpu_usage;
+	struct process_container *process_obj, *elem = NULL;
+	struct process_container* object_container[65535]; // array holding process objects
+	struct json_object *ret_json, *json_array, *json_obj;
+	ret_json = json_object_new_object();
+	json_array = json_object_new_array();
+	char state_str[2] = "\0";
+
+	PROCTAB* proc = openproc(PROC_FILLMEM | PROC_FILLSTAT);
+	if (!proc){
+		AFB_REQ_ERROR(request, "Unable to open /proc!");
+		afb_req_fail_f(request, "Failed", "Error processing arguments.");
+	}
+
+	proc_t* proc_info;
+	while ((proc_info = readproc(proc, NULL)) != NULL) {
+		last_pstat_values = fill_pstat(proc_info);
+		process_obj = process_container_constr(proc_info->cmd, proc_info->euid, last_pstat_values);
+		object_container[proc_info->tid] = process_obj;
+		freeproc(proc_info);
+	}
+
+	sleep(seconds);
+
+	proc = openproc(PROC_FILLMEM | PROC_FILLSTAT);
+	if (!proc){
+		AFB_REQ_ERROR(request, "Unable to open /proc!");
+		afb_req_fail_f(request, "Failed", "Error processing arguments.");
+	}
+
+	proc_t* proc_info2;
+	while ((proc_info2 = readproc(proc, NULL)) != NULL) {
+		now_pstat_values = fill_pstat(proc_info2);
+		elem = object_container[proc_info2->tid];
+		if(elem){
+			cpu_usage = cpu_calculate(elem->pstat_values, now_pstat_values);
+			json_obj = json_object_new_object();
+			json_object_object_add(json_obj, "cmd", json_object_new_string(proc_info2->cmd));
+			json_object_object_add(json_obj, "tid", json_object_new_int(proc_info2->tid));
+			json_object_object_add(json_obj, "euid", json_object_new_int(proc_info2->euid));
+			json_object_object_add(json_obj, "scpu", json_object_new_double(cpu_usage->scpu_usage));
+			json_object_object_add(json_obj, "ucpu", json_object_new_double(cpu_usage->ucpu_usage));
+			json_object_object_add(json_obj, "resident_mem", json_object_new_double((proc_info2->resident * page_size)/ pow(1024, 2)));
+			state_str[0] = proc_info2->state;
+			json_object_object_add(json_obj, "state", json_object_new_string(state_str));
+			json_object_array_add(json_array, json_obj);
+		}
+		freeproc(proc_info2);
+	}
+	json_object_object_add(ret_json, "processes", json_array);
+	afb_req_success(request, ret_json, NULL);
+
+	closeproc(proc);
+	// printf ("The json object created: %s\n", json_object_to_json_string(ret_json));
+}
+
+struct pstat* fill_pstat(proc_t *proc_info){
+
+	long unsigned int cpu_total_time;
+	long unsigned int cpu_time[10];
+	struct pstat *pstat_values = malloc(sizeof(struct pstat));
+
+	pstat_values->utime_ticks = proc_info->utime;
+	pstat_values->cutime_ticks = proc_info->cutime;
+	pstat_values->stime_ticks = proc_info->stime;
+	pstat_values->cstime_ticks = proc_info->cstime;
+
+	FILE *fstat = fopen("/proc/stat", "r");
+	if (fstat == NULL) {
+		perror("FOPEN ERROR ");
+		fclose(fstat);
+	}
+
+	memset(cpu_time, 0, sizeof(cpu_time));
+	if (fscanf(fstat, "%*s %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu",
+				&cpu_time[0], &cpu_time[1], &cpu_time[2], &cpu_time[3],
+				&cpu_time[4], &cpu_time[5], &cpu_time[6], &cpu_time[7],
+				&cpu_time[8], &cpu_time[9]) == EOF) {
+		fclose(fstat);
+	}
+
+	fclose(fstat);
+
+	/*
+	 * Returns total CPU time. It is a sum of user, nice, system, idle, iowait, irq, softirq, steal, guest, guest_nice
+	 */
+	for(int i = 0; i < 10; i++)
+		pstat_values->cpu_total_time += cpu_time[i];
+
+	return pstat_values;
+}
+
+struct cpu_percentage* cpu_calculate(struct pstat *last_pstat_values, struct pstat *now_pstat_values){
+
+	long unsigned int total_time_diff = now_pstat_values->cpu_total_time - last_pstat_values->cpu_total_time;
+
+	struct cpu_percentage *cpu_values = malloc(sizeof(struct cpu_percentage));
+
+	cpu_values->ucpu_usage = 100 * (((now_pstat_values->utime_ticks + now_pstat_values->cutime_ticks)
+	- (last_pstat_values->utime_ticks + last_pstat_values->cutime_ticks)) / (double) total_time_diff);
+
+	cpu_values->scpu_usage = 100 * (((now_pstat_values->stime_ticks + now_pstat_values->cstime_ticks)
+	- (last_pstat_values->stime_ticks + last_pstat_values->cstime_ticks)) / (double) total_time_diff);
+
+	return cpu_values;
+}
+
+struct process_container* process_container_constr(char* process_name, int euid, struct pstat *pstat_values) {
+
+	struct process_container *r = malloc(sizeof(struct process_container));
+	r->process_name = process_name;
+	r->euid = euid;
+	r->pstat_values = pstat_values;
+
+	return r;
+}
+
+static const struct afb_verb_v2 _afb_verbs_v2_taskmanager[] = {
+	{
+		.verb = "get_process_list",
+		.callback = get_process_list,
+		.auth = NULL,
+		.info = "Get an array of all processes currently running on the system",
+		.session = AFB_SESSION_NONE_V2
+	}
+};
+
+
+const struct afb_binding_v2 afbBindingV2 = {
+	.api = "taskmanager",
+	.specification = NULL,
+	.info = "Task Manager service",
+	.verbs = _afb_verbs_v2_taskmanager,
+	.noconcurrency = 0
+};
\ No newline at end of file