void
test_link_stream(CuTest *tc) {
printf("%s\n", __func__);
char test_dir[] = "test-pagedb-XXXXXX";
mkdtemp(test_dir);
PageDB *db;
int ret = page_db_new(&db, test_dir);
CuAssert(tc,
db!=0? db->error->message: "NULL",
ret == 0);
db->persist = 0;
/* +----------------+
* | |
* a1 --> a2 |
* | ^ |
* | | v
* +----> b1 -----> b2
*/
const char *url_a1 = "http://test_a.org/1";
const char *url_a2 = "http://test_a.org/2";
const char *url_b1 = "http://test_b.org/1";
const char *url_b2 = "http://test_b.org/2";
CrawledPage *cp = crawled_page_new(url_a1);
crawled_page_add_link(cp, url_a2, 1.0);
crawled_page_add_link(cp, url_b1, 1.0);
crawled_page_add_link(cp, url_b2, 1.0);
CuAssert(tc,
db->error->message,
page_db_add(db, cp, 0) == 0);
crawled_page_delete(cp);
cp = crawled_page_new(url_b1);
crawled_page_add_link(cp, url_b2, 1.0);
crawled_page_add_link(cp, url_a2, 1.0);
CuAssert(tc,
db->error->message,
page_db_add(db, cp, 0) == 0);
crawled_page_delete(cp);
uint64_t idx[4];
CuAssert(tc,
db->error->message,
page_db_get_idx(db, page_db_hash(url_a1), idx + 0) == 0);
CuAssert(tc,
db->error->message,
page_db_get_idx(db, page_db_hash(url_a2), idx + 1) == 0);
CuAssert(tc,
db->error->message,
page_db_get_idx(db, page_db_hash(url_b1), idx + 2) == 0);
CuAssert(tc,
db->error->message,
page_db_get_idx(db, page_db_hash(url_b2), idx + 3) == 0);
Link links_diff[] = {
{.from = idx[0], .to = idx[2]}, // a1 -> b1
{.from = idx[0], .to = idx[3]}, // a1 -> b2
/* Checks the accuracy of the HITS computation */
void
test_hits(CuTest *tc) {
/* Compute the HITS score of the following graph
* +-->2---+
* | | |
* | v v
* 1-->5<--3
* ^ ^ |
* | | |
* +---4<--+
*
* The link matrix L[i,j], where L[i,j] = 1 means 'i' links to 'j' is:
*
* +- -+
* | 0 1 0 0 1 |
* | 0 0 1 0 1 |
* L = | 0 0 0 1 1 |
* | 1 0 0 0 1 |
* | 0 0 0 0 0 |
* +- -+
*/
char test_dir[] = "test-pagedb-XXXXXX";
mkdtemp(test_dir);
PageDB *db;
int ret = page_db_new(&db, test_dir);
CuAssert(tc,
db!=0? db->error->message: "NULL",
ret == 0);
db->persist = 0;
char *urls[5] = {"1", "2", "3", "4", "5" };
LinkInfo links_1[] = {{"2", 0.1}, {"5", 0.1}};
LinkInfo links_2[] = {{"3", 0.1}, {"5", 0.1}};
LinkInfo links_3[] = {{"4", 0.1}, {"5", 0.1}};
LinkInfo links_4[] = {{"1", 0.1}, {"5", 0.1}};
LinkInfo *links[5] = {
links_1, links_2, links_3, links_4, 0
};
int n_links[5] = {2, 2, 2, 2, 0};
for (int i=0; i<5; ++i) {
CrawledPage *cp = crawled_page_new(urls[i]);
for (int j=0; j<n_links[i]; ++j)
crawled_page_add_link(cp, links[i][j].url, links[i][j].score);
cp->score = i/5.0;
crawled_page_set_hash64(cp, i);
PageInfoList *pil;
CuAssert(tc,
db->error->message,
page_db_add(db, cp, &pil) == 0);
page_info_list_delete(pil);
crawled_page_delete(cp);
}
PageDBLinkStream *st;
CuAssert(tc,
db->error->message,
page_db_link_stream_new(&st, db) == 0);
st->only_diff_domain = 0;
Hits *hits;
ret = hits_new(&hits, test_dir, 5);
CuAssert(tc,
hits!=0? hits->error->message: "NULL",
ret == 0);
hits->precision = 1e-8;
CuAssert(tc,
hits->error->message,
hits_compute(hits,
st,
page_db_link_stream_next,
page_db_link_stream_reset) == 0);
page_db_link_stream_delete(st);
uint64_t idx;
float *h_score;
float *a_score;
float h_scores[5] = {0.250, 0.250, 0.250, 0.250, 0.000};
float a_scores[5] = {0.125, 0.125, 0.125, 0.125, 0.500};
for (int i=0; i<5; ++i) {
CuAssert(tc,
db->error->message,
page_db_get_idx(db, page_db_hash(urls[i]), &idx) == 0);
CuAssertPtrNotNull(tc,
h_score = mmap_array_idx(hits->h1, idx));
CuAssertPtrNotNull(tc,
a_score = mmap_array_idx(hits->a1, idx));
CuAssertDblEquals(tc, h_scores[i], *h_score, 1e-6);
CuAssertDblEquals(tc, a_scores[i], *a_score, 1e-6);
}
CuAssert(tc,
hits->error->message,
hits_delete(hits) == 0);
page_db_delete(db);
}
/* Tests the loading/dumping of PageInfo from and into LMDB values */
void
test_page_info_serialization(CuTest *tc) {
printf("%s\n", __func__);
MDB_val val;
PageInfo pi1 = {
.url = "test_url_123",
.first_crawl = 123,
.last_crawl = 456,
.n_changes = 100,
.n_crawls = 20,
.score = 0.7,
.content_hash_length = 8,
.content_hash = "1234567"
};
CuAssertTrue(tc, page_info_dump(&pi1, &val) == 0);
CuAssertDblEquals(tc, 0.7, page_info_dump_get_score(&val), 1e-6);
PageInfo *pi2 = page_info_load(&val);
CuAssertPtrNotNull(tc, pi2);
free(val.mv_data);
CuAssertStrEquals(tc, pi1.url, pi2->url);
CuAssertTrue(tc, pi1.first_crawl == pi2->first_crawl);
CuAssertTrue(tc, pi1.last_crawl == pi2->last_crawl);
CuAssertTrue(tc, pi1.n_changes == pi2->n_changes);
CuAssertTrue(tc, pi1.n_crawls == pi2->n_crawls);
CuAssertTrue(tc, pi1.score == pi2->score);
CuAssertTrue(tc, pi1.content_hash_length == pi2->content_hash_length);
CuAssertStrEquals(tc, pi1.content_hash, pi2->content_hash);
page_info_delete(pi2);
}
/* Tests all the database operations on a very simple crawl of just two pages */
void
test_page_db_simple(CuTest *tc) {
printf("%s\n", __func__);
char test_dir[] = "test-pagedb-XXXXXX";
mkdtemp(test_dir);
PageDB *db;
int ret = page_db_new(&db, test_dir);
CuAssert(tc,
db!=0? db->error->message: "NULL",
ret == 0);
db->persist = 0;
CrawledPage *cp1 = crawled_page_new("www.yahoo.com");
crawled_page_add_link(cp1, "a", 0.1);
crawled_page_add_link(cp1, "b", 0.2);
crawled_page_add_link(cp1, "www.google.com", 0.3);
crawled_page_set_hash64(cp1, 1000);
cp1->score = 0.5;
CrawledPage *cp2 = crawled_page_new("www.bing.com");
crawled_page_add_link(cp2, "x", 1.1);
crawled_page_add_link(cp2, "y", 1.2);
crawled_page_set_hash64(cp2, 2000);
cp2->score = 0.2;
PageInfoList *pil;
CuAssert(tc,
db->error->message,
page_db_add(db, cp1, &pil) == 0);
page_info_list_delete(pil);
CuAssert(tc,
db->error->message,
page_db_add(db, cp2, &pil) == 0);
page_info_list_delete(pil);
crawled_page_set_hash64(cp2, 3000);
CuAssert(tc,
db->error->message,
page_db_add(db, cp2, &pil) == 0);
page_info_list_delete(pil);
MMapArray *scores = 0;
CuAssert(tc,
db->error->message,
page_db_get_scores(db, &scores) == 0);
size_t idx;
CuAssert(tc,
db->error->message,
page_db_get_idx(db, page_db_hash("www.yahoo.com"), &idx) == 0);
CuAssertDblEquals(
tc,
0.5,
*(float*)mmap_array_idx(scores, idx),
1e-6);
CuAssert(tc,
db->error->message,
page_db_get_idx(db, page_db_hash("x"), &idx) == 0);
CuAssertDblEquals(
tc,
1.1,
*(float*)mmap_array_idx(scores, idx),
1e-6);
CHECK_DELETE(tc, scores->error->message, mmap_array_delete(scores));
crawled_page_delete(cp1);
crawled_page_delete(cp2);
char pi_out[1000];
char *print_pages[] = {"www.yahoo.com", "www.google.com", "www.bing.com"};
for (size_t i=0; i<3; ++i) {
PageInfo *pi;
CuAssert(tc,
db->error->message,
page_db_get_info(db, page_db_hash(print_pages[i]), &pi) == 0);
CuAssertPtrNotNull(tc, pi);
switch(i) {
case 0:
CuAssertIntEquals(tc, 1, pi->n_crawls);
CuAssertIntEquals(tc, 0, pi->n_changes);
break;
case 1:
CuAssertIntEquals(tc, 0, pi->n_crawls);
break;
case 2:
CuAssertIntEquals(tc, 2, pi->n_crawls);
CuAssertIntEquals(tc, 1, pi->n_changes);
break;
}
page_info_print(pi, pi_out);
page_info_delete(pi);
/* show on screen the page info:
*
* Mon Apr 6 15:34:50 2015|Mon Apr 6 15:34:50 2015|1.00e+00|0.00e+00|www.yahoo.com
* Thu Jan 1 01:00:00 1970|Thu Jan 1 01:00:00 1970|0.00e+00|0.00e+00|www.google.com
* Mon Apr 6 15:34:50 2015|Mon Apr 6 15:34:50 2015|2.00e+00|1.00e+00|www.bing.com
*/
#if 0
printf("%s\n", pi_out);
#endif
}
PageDBLinkStream *es;
CuAssert(tc,
db->error->message,
page_db_link_stream_new(&es, db) == 0);
es->only_diff_domain = 0;
if (es->state == stream_state_init) {
Link link;
int i=0;
while (page_db_link_stream_next(es, &link) == stream_state_next) {
switch(i++) {
case 0:
CuAssertIntEquals(tc, 0, link.from);
CuAssertIntEquals(tc, 1, link.to);
break;
case 1:
CuAssertIntEquals(tc, 0, link.from);
CuAssertIntEquals(tc, 2, link.to);
break;
case 2:
CuAssertIntEquals(tc, 0, link.from);
CuAssertIntEquals(tc, 3, link.to);
break;
case 3:
CuAssertIntEquals(tc, 4, link.from);
CuAssertIntEquals(tc, 5, link.to);
break;
case 4:
CuAssertIntEquals(tc, 4, link.from);
CuAssertIntEquals(tc, 6, link.to);
break;
default:
CuFail(tc, "too many links");
break;
}
}
CuAssertTrue(tc, es->state != stream_state_error);
}
page_db_link_stream_delete(es);
page_db_delete(db);
}
/* Checks the accuracy of the PageRank computation */
void
test_page_rank(CuTest *tc) {
printf("%s\n", __func__);
/* Compute the PageRank score of the following graph
* +-->2---+
* | | |
* | v v
* 1-->5<--3
* ^ ^ |
* | | |
* +---4<--+
*
* The link matrix L[i,j], where L[i,j] = 1 means 'i' links to 'j' is:
*
* +- -+
* | 0 1 0 0 1 |
* | 0 0 1 0 1 |
* L = | 0 0 0 1 1 |
* | 1 0 0 0 1 |
* | 0 0 0 0 0 |
* +- -+
*
* Since page "5" has no outbound links, it is assumed it links to every other page:
*
* +- -+
* | 0 1 0 0 1 |
* | 0 0 1 0 1 |
* L = | 0 0 0 1 1 |
* | 1 0 0 0 1 |
* | 1 1 1 1 1 |
* +- -+
*
* The out degree is:
*
* deg = {2, 2, 2, 2, 5}
*
* Dividing each row with the out degree and transposing we get the matrix:
*
* M[i, j] = L[j, i]/deg[j]
*
* we get:
*
* +- -+
* | 0 0 0 0.5 0.2 |
* | 0.5 0 0 0 0.2 |
* M = | 0 0.5 0 0 0.2 |
* | 0 0 0.5 0 0.2 |
* | 0.5 0.5 0.5 0.5 0.2 |
* +- -+
*
* If 'd' is the damping then the PageRank 'PR' is:
*
* 1 - d
* PR = ----- + (d * M)*PR
* N
*
* For d=0.85 the numerical solution is:
*
* PR(1) = PR(2) = PR(3) = PR(4) = 0.15936255
* PR(5) = 0.3625498
*/
char test_dir[] = "test-pagedb-XXXXXX";
mkdtemp(test_dir);
PageDB *db;
int ret = page_db_new(&db, test_dir);
CuAssert(tc,
db!=0? db->error->message: "NULL",
ret == 0);
db->persist = 0;
char *urls[5] = {"1", "2", "3", "4", "5" };
LinkInfo links_1[] = {{"2", 0.1}, {"5", 0.1}};
LinkInfo links_2[] = {{"3", 0.1}, {"5", 0.1}};
LinkInfo links_3[] = {{"4", 0.1}, {"5", 0.1}};
LinkInfo links_4[] = {{"1", 0.1}, {"5", 0.1}};
LinkInfo *links[5] = {
links_1, links_2, links_3, links_4, 0
};
int n_links[5] = {2, 2, 2, 2, 0};
for (int i=0; i<5; ++i) {
CrawledPage *cp = crawled_page_new(urls[i]);
for (int j=0; j<n_links[i]; ++j)
crawled_page_add_link(cp, links[i][j].url, links[i][j].score);
cp->score = i/5.0;
crawled_page_set_hash64(cp, i);
PageInfoList *pil;
CuAssert(tc,
db->error->message,
page_db_add(db, cp, &pil) == 0);
page_info_list_delete(pil);
crawled_page_delete(cp);
}
// Without content scores
// ------------------------------------------------------------------------
PageDBLinkStream *st;
CuAssert(tc,
db->error->message,
page_db_link_stream_new(&st, db) == 0);
st->only_diff_domain = 0;
PageRank *pr;
ret = page_rank_new(&pr, test_dir, 5);
CuAssert(tc,
pr!=0? pr->error->message: "NULL",
ret == 0);
pr->precision = 1e-6;
CuAssert(tc,
pr->error->message,
page_rank_compute(pr,
st,
page_db_link_stream_next,
page_db_link_stream_reset) == 0);
page_db_link_stream_delete(st);
uint64_t idx;
float *score;
float scores[5] = {0.15936255, 0.15936255, 0.15936255, 0.15936255, 0.3625498};
for (int i=0; i<5; ++i) {
CuAssert(tc,
db->error->message,
page_db_get_idx(db, page_db_hash(urls[i]), &idx) == 0);
CuAssertPtrNotNull(tc,
score = mmap_array_idx(pr->value1, idx));
CuAssertDblEquals(tc, scores[i], *score, 1e-6);
}
CHECK_DELETE(tc, pr->error->message, page_rank_delete(pr));
// With content scores, damping = 0
// ------------------------------------------------------------------------
CuAssert(tc,
db->error->message,
page_db_link_stream_new(&st, db) == 0);
st->only_diff_domain = 0;
ret = page_rank_new(&pr, test_dir, 5);
CuAssert(tc,
pr!=0? pr->error->message: "NULL",
ret == 0);
pr->precision = 1e-6;
pr->damping = 0.0;
CuAssert(tc,
db->error->message,
page_db_get_scores(db, &pr->scores) == 0);
CuAssert(tc,
pr->error->message,
page_rank_compute(pr,
st,
page_db_link_stream_next,
page_db_link_stream_reset) == 0);
page_db_link_stream_delete(st);
float total_score = 0.0;
for (int i=0; i<5; ++i)
total_score += scores[i] = *((float*)mmap_array_idx(pr->scores, i));
for (int i=0; i<5; ++i) {
CuAssert(tc,
db->error->message,
page_db_get_idx(db, page_db_hash(urls[i]), &idx) == 0);
CuAssertPtrNotNull(tc,
score = mmap_array_idx(pr->value1, idx));
CuAssertDblEquals(tc, scores[idx]/total_score, *score, 1e-6);
}
CHECK_DELETE(tc, pr->scores->error->message, mmap_array_delete(pr->scores));
CHECK_DELETE(tc, pr->error->message, page_rank_delete(pr));
// With content scores, damping = 0.5
// ------------------------------------------------------------------------
CuAssert(tc,
db->error->message,
page_db_link_stream_new(&st, db) == 0);
st->only_diff_domain = 0;
ret = page_rank_new(&pr, test_dir, 5);
CuAssert(tc,
pr!=0? pr->error->message: "NULL",
ret == 0);
pr->precision = 1e-6;
pr->damping = 0.5;
CuAssert(tc,
db->error->message,
page_db_get_scores(db, &pr->scores) == 0);
CuAssert(tc,
pr->error->message,
page_rank_compute(pr,
st,
page_db_link_stream_next,
page_db_link_stream_reset) == 0);
page_db_link_stream_delete(st);
float expected_pr[] = {
0.06386554621848739,
0.08739495798319329,
0.1647058823529412,
0.25546218487394956,
0.4285714285714286
};
for (int i=0; i<5; ++i) {
CuAssert(tc,
db->error->message,
page_db_get_idx(db, page_db_hash(urls[i]), &idx) == 0);
CuAssertPtrNotNull(tc,
score = mmap_array_idx(pr->value1, idx));
CuAssertDblEquals(tc, expected_pr[i], *score, 1e-6);
}
CHECK_DELETE(tc, pr->scores->error->message, mmap_array_delete(pr->scores));
CHECK_DELETE(tc, pr->error->message, page_rank_delete(pr));
page_db_delete(db);
}
