source: Evidence/DColl/DColl.cc@ 142

Last change on this file since 142 was 142, checked in by ogrimm, 17 years ago
Various updates
File size: 12.3 KB
Line 
1/********************************************************************\
2
3 Central data collector of the Evidence Control System
4
5 - DColl subscribes to all services given by the configuration
6 server and writes these to the data file at every update.
7 - One data file per day is generated, with roll-over at 13:00 local time.
8 - For each service, it creates a new service with '.hist' appended
9 that contains a history of events kept within a ring buffer. Each
10 entry will be the result of a conversion to double of the text
11 written to the data file. Only if the new value has changed by a
12 minimum amout it will be added to the ring buffer.
13 - The command 'DColl/Log' writes the associated string to the log
14 file specified in the configuration.
15
16 Oliver Grimm, December 2009
17
18\********************************************************************/
19
20#define SERVER_NAME "DColl"
21
22#define DATE_ROLLOVER 12 // localtime hour after which next date is used
23
24#include "../Evidence.h"
25#include <math.h>
26#include <float.h>
27#include <sys/stat.h>
28#include <ctype.h>
29#include <sys/types.h>
30#include <regex.h>
31
32//
33// Class declaration
34//
35class DataHandler: public DimClient, public DimBrowser,
36 public EvidenceServer {
37
38 struct Item {
39 DimStampedInfo *DataItem;
40 DimService *HistService;
41 struct EvidenceHistoryItem *HistBuffer;
42 int HistPointer;
43 double LastValue;
44 double MinAbsChange;
45 } *List;
46
47 DimCommand *LogCommand;
48
49 unsigned int NumItems;
50 FILE *DataFile;
51 FILE *LogFile;
52 float DataSizekB, LogSizekB;
53 int DataSizeLastUpdate, LogSizeLastUpdate;
54 char *DataDir;
55 DimService *LogSizeService, *DataSizeService;
56 int HistSize;
57 int SizeUpdateDelay;
58 int TimeForNextFile;
59
60 int RegExCount;
61 regex_t *RegEx;
62 double *MinChange;
63
64 void infoHandler();
65 void commandHandler();
66 void AddService(char *);
67 float FileSize(FILE *);
68
69 public:
70 DataHandler();
71 ~DataHandler();
72};
73
74//
75// Constructor
76//
77DataHandler::DataHandler(): EvidenceServer(SERVER_NAME) {
78
79 // Initialization to prevent freeing unallocated memory
80 DataFile = NULL;
81 LogFile = NULL;
82 List = NULL;
83 LogSizeService = NULL;
84 DataSizeService = NULL;
85
86 DataSizeLastUpdate = 0;
87 LogSizeLastUpdate = 0;
88 TimeForNextFile = 0;
89
90 // Request configuration data
91 char *Change = GetConfig(SERVER_NAME " minchange");
92 DataDir = GetConfig(SERVER_NAME " datadir");
93 char *Logname = GetConfig(SERVER_NAME " logfile");
94 SizeUpdateDelay = atoi(GetConfig(SERVER_NAME " sizeupdate"));
95 HistSize = atoi(GetConfig(SERVER_NAME " histsize"));
96 if (HistSize < 1) HistSize = 1; // Minimum one items
97
98 // Open log file
99 if ((LogFile = fopen(Logname, "a")) == NULL) {
100 State(FATAL, "Could not open log file '%s' (%s)", Logname, strerror(errno));
101 }
102
103 // Provide logging command
104 LogCommand = new DimCommand("DColl/Log", (char *) "C", this);
105
106 // Create services for file sizes
107 DataSizekB = 0;
108 DataSizeService = new DimService(SERVER_NAME "/DataSizekB", DataSizekB);
109
110 LogSizekB = FileSize(LogFile);
111 LogSizeService = new DimService(SERVER_NAME "/LogSizekB", LogSizekB);
112
113 // Count how many minimum change value regular expressions are present
114 RegExCount = 0;
115 char *Token = strtok(Change, "\t ");
116 while (Token != NULL) {
117 RegExCount++;
118 Token = strtok(NULL, "\t ");
119 }
120
121 // Allocate memory for regular expressions and minimum change values
122 RegEx = new regex_t[RegExCount];
123 MinChange = new double [RegExCount];
124
125 // Compile regular expressions
126 int Pos = 0;
127 for (int i=0; i<RegExCount; i++) {
128 int Len = strlen(Change+Pos) + 1;
129 Token = strtok(Change + Pos, ": \t");
130
131 int Ret = regcomp(&RegEx[i], Token, REG_EXTENDED|REG_NOSUB);
132 if (Ret != 0) {
133 char ErrMsg[200];
134 regerror(Ret, &RegEx[i], ErrMsg, sizeof(ErrMsg));
135 State(WARN, "Error compiling regular expression '%s' (%s)", Token, ErrMsg);
136 }
137 else {
138 if ((Token=strtok(NULL, "")) != NULL) MinChange[i] = atof(Token);
139 else MinChange[i] = 0;
140 }
141 Pos += Len;
142 }
143
144 // Subscribe to list of servers at DIS_DNS
145 AddService((char *) "DIS_DNS/SERVER_LIST");
146
147 DimClient::sendCommand("DColl/Log", SERVER_NAME" *** Logging started ***");
148}
149
150//
151// Destructor: Close files and free memory
152//
153DataHandler::~DataHandler() {
154
155 // Delete DIM services and command first so handlers and not called anymore
156 for (int i=0; i<NumItems; i++) {
157 delete List[i].HistService;
158 delete List[i].DataItem;
159 delete[] List[i].HistBuffer;
160 }
161 free(List);
162
163 //delete LogSizeService; // These create segmentation faults?!
164 //delete DataSizeService;
165
166 delete LogCommand;
167
168 // Close files
169 if (LogFile != NULL) if (fclose(LogFile) != 0) {
170 State(ERROR, "Could not close log file (%s)", strerror(errno));
171 }
172 if (DataFile != NULL && fclose(DataFile) != 0) {
173 State(ERROR, "Error: Could not close data file (%s)", strerror(errno));
174 }
175
176 // Free memory for regular expressions handling
177 for (int i=0; i<RegExCount; i++) {
178 regfree(&RegEx[i]);
179 }
180 delete[] MinChange;
181 delete[] RegEx;
182}
183
184//
185// Implementation of data handling
186//
187// DIM ensures infoHandler() is called serialized, therefore
188// no mutex is needed to serialize writing to the file
189void DataHandler::infoHandler() {
190
191 DimInfo *Info = getInfo();
192
193 // Check if service available
194 if (Info->getSize()==strlen(NO_LINK)+1 && strcmp(Info->getString(), NO_LINK)==0) return;
195
196 // If service is DIS_DNS/SERVER_LIST, subscribe to all SERVICE_LIST services
197 if (strcmp(Info->getName(), "DIS_DNS/SERVER_LIST") == 0) {
198 char *Token = strtok(Info->getString(), "+-!|@");
199 while (Token != NULL) {
200 char *Buf;
201 if (MakeString(&Buf, "%s/SERVICE_LIST", Token) != -1) {
202 AddService(Buf);
203 free(Buf);
204 }
205 else State(ERROR, "MakeString() failed for server %s", Token);
206
207 Token = strtok(NULL, "|");
208 Token = strtok(NULL, "+-!|@");
209 }
210 return;
211 }
212
213 // If service is SERVICE_LIST of any server, scan all services.
214 // Subscribe to all services (but not to commands and RPCs)
215 if (strstr(Info->getName(), "/SERVICE_LIST") != NULL) {
216 char *Name = strtok(Info->getString(), "+-!|");
217 while (Name != NULL) {
218 char *Type = strtok(NULL, "\n");
219 if (Type == NULL) return; // for safety, should not happen
220 if (strstr(Type, "|CMD")==NULL && strstr(Type, "|RPC")==NULL) {
221 AddService(Name);
222 }
223 Name = strtok(NULL, "+-!|");
224 }
225 return;
226 }
227
228 // If it is time to open new data file, close the current one
229 if (time(NULL) >= TimeForNextFile) {
230 if (DataFile != NULL && fclose(DataFile) != 0) {
231 State(ERROR, "Error: Could not close data file (%s)", strerror(errno));
232 }
233 DataFile = NULL;
234 }
235
236 // Open new data file if necessary
237 if (DataFile == NULL) {
238 time_t Time = time(NULL);
239 struct tm *T = localtime(&Time);
240
241 if(T->tm_hour >= DATE_ROLLOVER) T->tm_mday++;
242 if (mktime(T) == -1) State(ERROR, "mktime() failed, check filename");
243
244 char *Filename;
245 if (MakeString(&Filename, "%s/%d%02d%02d.slow", DataDir, T->tm_year+1900, T->tm_mon+1, T->tm_mday) == -1) State(FATAL, "Could not create filename, MakeString() failed");
246 if ((DataFile = fopen(Filename, "a")) == NULL) {
247 State(FATAL, "Could not open data file '%s' (%s)", Filename, strerror(errno));
248 }
249 else State(INFO, "Opened data file '%s'", Filename);
250 free(Filename);
251
252 // Calculate time for next file opening
253 T->tm_sec = 0;
254 T->tm_min = 0;
255 T->tm_hour = DATE_ROLLOVER;
256 TimeForNextFile = mktime(T);
257 }
258
259 // Identify index of service
260 int Service;
261 for (Service=0; Service<NumItems; Service++) if (Info == List[Service].DataItem) break;
262 if (Service == NumItems) return; // Service not found
263
264 // If negative value for absolute change, ignore this entry
265 if (List[Service].MinAbsChange < 0) return;
266
267 // Write data header
268 time_t RawTime = Info->getTimestamp();
269 struct tm *TM = localtime(&RawTime);
270
271 fprintf(DataFile, "%s %d %d %d %d %d %d %d %lu ", Info->getName(), TM->tm_year+1900, TM->tm_mon+1, TM->tm_mday, TM->tm_hour, TM->tm_min, TM->tm_sec, Info->getTimestampMillisecs(), Info->getTimestamp());
272
273 // Translate data into ASCII
274 char *Text = EvidenceServer::ToString(Info);
275 if (Text != NULL) {
276 // Replace all control characters by white space
277 for (int i=0; i<strlen(Text); i++) if (iscntrl(Text[i])) Text[i] = ' ';
278
279 // Write to file
280 fprintf(DataFile, "%s\n", Text);
281
282 // Add to history buffer if change large enough
283 if ((fabs(atof(Text)-List[Service].LastValue) > List[Service].MinAbsChange)) {
284 List[Service].HistBuffer[List[Service].HistPointer].Seconds = Info->getTimestamp();
285 List[Service].HistBuffer[List[Service].HistPointer].Value = atof(Text);
286 List[Service].HistService->updateService();
287 List[Service].HistPointer++;
288 if (List[Service].HistPointer >= HistSize) List[Service].HistPointer = 0;
289 List[Service].LastValue = atof(Text);
290 }
291 free(Text);
292 }
293 else fprintf(DataFile, "Cannot interpret format identifier\n");
294
295 fflush(DataFile);
296
297 // Terminate if error because otherwise infinite loop might result as
298 // next call to this infoHandler() will try to (re-)open file
299 if(ferror(DataFile)) {
300 fclose(DataFile);
301 DataFile = NULL;
302 State(FATAL, "Error writing to data file, closed file (%s)", strerror(errno));
303 }
304
305 // Update datafile size service
306 if (time(NULL) - DataSizeLastUpdate > SizeUpdateDelay) {
307 DataSizekB = FileSize(DataFile);
308 DataSizeService->updateService();
309 DataSizeLastUpdate = time(NULL);
310 }
311}
312
313//
314// Implementation of log writing
315//
316void DataHandler::commandHandler() {
317
318 if (getCommand() != LogCommand || LogFile == NULL) return;
319
320 // Replace all carriage-return by line feed and non-printable characters
321 char *Text = getCommand()->getString();
322 for (unsigned int i=0; i<strlen(Text); i++) {
323 if (Text[i] == '\r') Text[i] = '\n';
324 if(isprint(Text[i])==0 && isspace(Text[i])==0) Text[i] = ' ';
325 }
326
327 time_t RawTime = time(NULL);
328 struct tm *TM = localtime(&RawTime);
329
330 fprintf(LogFile, "%d/%d/%d %d:%d:%d: %s\n",
331 TM->tm_mday, TM->tm_mon+1, TM->tm_year+1900,
332 TM->tm_hour, TM->tm_min, TM->tm_sec, Text);
333
334 fflush(LogFile);
335
336 // If error close file (otherwise infinite loop because State() also writes to log)
337 if(ferror(LogFile)) {
338 fclose(LogFile);
339 LogFile = NULL;
340 State(ERROR, "Error writing to log file, closing file (%s)", strerror(errno));
341 }
342
343 // Update logfile size service
344 if (time(NULL) - LogSizeLastUpdate > SizeUpdateDelay) {
345 LogSizekB = FileSize(LogFile);
346 LogSizeService->updateService();
347 LogSizeLastUpdate = time(NULL);
348 }
349}
350
351
352//
353// Add service to watch list
354//
355void DataHandler::AddService(char *Name) {
356
357 // Do not subscribe to history services (otherwise infinite loop)
358 if (strstr(Name, ".hist") != NULL) return;
359
360 // Check if already subscribed to this service
361 for (int i=0; i<NumItems; i++) {
362 if(strcmp(Name, List[i].DataItem->getName()) == 0) return;
363 }
364
365 // Increase capacity of item list
366 struct Item *New = (struct Item *) realloc(List, (NumItems+1)*sizeof(struct Item));
367 if (New != NULL) List = New;
368 else {
369 State(ERROR, "Could not allocate memory for item list, service '' not added (%s)", Name, strerror(errno));
370 return;
371 }
372
373 // Set minimum required change by comparing to regular expressions
374 List[NumItems].MinAbsChange = 0;
375 for (int i=0; i<RegExCount; i++) {
376 if (regexec(&RegEx[i], Name, (size_t) 0, NULL, 0) == 0) {
377 List[NumItems].MinAbsChange = MinChange[i];
378 }
379 }
380
381 List[NumItems].LastValue = DBL_MAX;
382
383 // Create history service
384 List[NumItems].HistBuffer = new struct EvidenceHistoryItem [HistSize];
385 memset(List[NumItems].HistBuffer, 0, HistSize*sizeof(EvidenceHistoryItem));
386 List[NumItems].HistPointer = 0;
387
388 char *Buf;
389 if (MakeString(&Buf, "%s.hist", Name) == -1) {
390 State(ERROR, "Could not create history service for '%s', MakeString() failed", Name);
391 }
392 else {
393 List[NumItems].HistService = new DimService (Buf, (char *) "C",
394 List[NumItems].HistBuffer, HistSize*sizeof(EvidenceHistoryItem));
395 free(Buf);
396 }
397
398 // Subscribe to service
399 List[NumItems].DataItem = new DimStampedInfo(Name, NO_LINK, this);
400
401 // Increase number only after all set-up
402 NumItems++;
403}
404
405//
406// Determine size of file in kB
407//
408float DataHandler::FileSize(FILE *File) {
409
410 struct stat FileStatus;
411
412 if (fstat(fileno(File), &FileStatus) == -1) {
413 State(WARN, "Could not determine size of file (%s)", strerror(errno));
414 return -1;
415 }
416
417 return (float) FileStatus.st_size/1024;
418}
419
420//
421// Main program
422//
423int main() {
424
425 // Static ensures calling of destructor by exit()
426 static DataHandler Data;
427
428 // Sleep until signal caught
429 pause();
430}
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