logcat: test: standardize rest() to let logs land when injecting
Add an internal rest() function to set the standard for how long we
should wait for a log message to land end to end into the logs. Add
a retry on -EBUSY for all descriptive tests along with a rest() after
log injection so the tests can try to survive heavy Denial Of Service
(DOS) loads. Some of the resting was done at a coarse 1 second, when
200ms will do just fine.
Fix a few pesky issues surrounding test reliability and correctness:
- stdint.h include missing.
- missing a logcat_executable, means logcatd.descriptive testing was
testing logcat instead.
- count of interfering tests is 3 now: logcat, liblogcat and logcatd, if
they all run in the same PID, we have to not fail.
- Added a missed opportunity to add uniqueness to logcat.descriptive sync
test.
Test: gTest logcat-unit-tests
Bug: 31456426
Change-Id: Iaf2bee97878957f654613bb2e78e32379bb8d1b7
diff --git a/logcat/tests/logcat_test.cpp b/logcat/tests/logcat_test.cpp
index 21868f2..b2b051e 100644
--- a/logcat/tests/logcat_test.cpp
+++ b/logcat/tests/logcat_test.cpp
@@ -17,6 +17,7 @@
#include <ctype.h>
#include <dirent.h>
#include <signal.h>
+#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -47,6 +48,16 @@
#define BIG_BUFFER (5 * 1024)
+// rest(), let the logs settle.
+//
+// logd is in a background cgroup and under extreme load can take up to
+// 3 seconds to land a log entry. Under moderate load we can do with 200ms.
+static void rest() {
+ static const useconds_t restPeriod = 200000;
+
+ usleep(restPeriod);
+}
+
// enhanced version of LOG_FAILURE_RETRY to add support for EAGAIN and
// non-syscall libs. Since we are only using this in the emergency of
// a signal to stuff a terminating code into the logs, we will spin rather
@@ -70,7 +81,7 @@
#undef LOG_TAG
#define LOG_TAG "inject"
RLOGE(logcat_executable ".buckets");
- sleep(1);
+ rest();
ASSERT_TRUE(NULL !=
(fp = logcat_popen(
@@ -1412,7 +1423,7 @@
LOG_FAILURE_RETRY(__android_log_print(ANDROID_LOG_WARN, logcat_regex_prefix,
logcat_regex_prefix "_aaaa"));
// Let the logs settle
- sleep(1);
+ rest();
ASSERT_TRUE(NULL != (fp = logcat_popen(ctx, buffer)));
@@ -1450,8 +1461,7 @@
LOG_FAILURE_RETRY(
__android_log_print(ANDROID_LOG_WARN, "logcat_test", "logcat_test"));
- // Let the logs settle
- sleep(1);
+ rest();
ASSERT_TRUE(NULL != (fp = logcat_popen(ctx, buffer)));
@@ -1476,8 +1486,7 @@
static bool End_to_End(const char* tag, const char* fmt, ...) {
logcat_define(ctx);
- FILE* fp = logcat_popen(ctx,
- "logcat"
+ FILE* fp = logcat_popen(ctx, logcat_executable
" -v brief"
" -b events"
" -v descriptive"
@@ -1523,13 +1532,12 @@
// Help us pinpoint where things went wrong ...
fprintf(stderr, "Closest match for\n %s\n is\n %s",
expect.c_str(), lastMatch.c_str());
- } else if (count > 2) {
+ } else if (count > 3) {
fprintf(stderr, "Too many matches (%d) for %s\n", count, expect.c_str());
}
- // Expect one the first time around as either liblogcat.descriptive or
- // logcat.descriptive. Expect two the second time as the other.
- return count == 1 || count == 2;
+ // Three different known tests, we can see pollution from the others
+ return count && (count <= 3);
}
TEST(logcat, descriptive) {
@@ -1537,24 +1545,28 @@
uint32_t tagNo;
const char* tagStr;
};
+ int ret;
{
static const struct tag hhgtg = { 42, "answer" };
android_log_event_list ctx(hhgtg.tagNo);
static const char theAnswer[] = "what is five by seven";
ctx << theAnswer;
- ctx.write();
+ // crafted to rest at least once after, and rest between retries.
+ for (ret = -EBUSY; ret == -EBUSY; rest()) ret = ctx.write();
+ EXPECT_LE(0, ret);
EXPECT_TRUE(
End_to_End(hhgtg.tagStr, "to life the universe etc=%s", theAnswer));
}
{
static const struct tag sync = { 2720, "sync" };
- static const char id[] = "logcat.decriptive";
+ static const char id[] = ___STRING(logcat) ".descriptive-sync";
{
android_log_event_list ctx(sync.tagNo);
ctx << id << (int32_t)42 << (int32_t)-1 << (int32_t)0;
- ctx.write();
+ for (ret = -EBUSY; ret == -EBUSY; rest()) ret = ctx.write();
+ EXPECT_LE(0, ret);
EXPECT_TRUE(End_to_End(sync.tagStr,
"[id=%s,event=42,source=-1,account=0]", id));
}
@@ -1563,7 +1575,8 @@
{
android_log_event_list ctx(sync.tagNo);
ctx << id << (int32_t)43 << (int64_t)-1 << (int32_t)0;
- ctx.write();
+ for (ret = -EBUSY; ret == -EBUSY; rest()) ret = ctx.write();
+ EXPECT_LE(0, ret);
EXPECT_TRUE(End_to_End(sync.tagStr, "[id=%s,event=43,-1,0]", id));
}
@@ -1571,7 +1584,8 @@
{
android_log_event_list ctx(sync.tagNo);
ctx << id << (int32_t)44 << (int32_t)-1 << (int64_t)0;
- ctx.write();
+ for (ret = -EBUSY; ret == -EBUSY; rest()) ret = ctx.write();
+ EXPECT_LE(0, ret);
fprintf(stderr, "Expect a \"Closest match\" message\n");
EXPECT_FALSE(End_to_End(
sync.tagStr, "[id=%s,event=44,source=-1,account=0]", id));
@@ -1583,7 +1597,8 @@
{
android_log_event_list ctx(sync.tagNo);
ctx << (uint64_t)30 << (int32_t)2;
- ctx.write();
+ for (ret = -EBUSY; ret == -EBUSY; rest()) ret = ctx.write();
+ EXPECT_LE(0, ret);
EXPECT_TRUE(
End_to_End(sync.tagStr, "[aggregation time=30ms,count=2]"));
}
@@ -1591,7 +1606,8 @@
{
android_log_event_list ctx(sync.tagNo);
ctx << (uint64_t)31570 << (int32_t)911;
- ctx.write();
+ for (ret = -EBUSY; ret == -EBUSY; rest()) ret = ctx.write();
+ EXPECT_LE(0, ret);
EXPECT_TRUE(
End_to_End(sync.tagStr, "[aggregation time=31.57s,count=911]"));
}
@@ -1602,42 +1618,48 @@
{
android_log_event_list ctx(sync.tagNo);
ctx << (uint32_t)512;
- ctx.write();
+ for (ret = -EBUSY; ret == -EBUSY; rest()) ret = ctx.write();
+ EXPECT_LE(0, ret);
EXPECT_TRUE(End_to_End(sync.tagStr, "current=512B"));
}
{
android_log_event_list ctx(sync.tagNo);
ctx << (uint32_t)3072;
- ctx.write();
+ for (ret = -EBUSY; ret == -EBUSY; rest()) ret = ctx.write();
+ EXPECT_LE(0, ret);
EXPECT_TRUE(End_to_End(sync.tagStr, "current=3KB"));
}
{
android_log_event_list ctx(sync.tagNo);
ctx << (uint32_t)2097152;
- ctx.write();
+ for (ret = -EBUSY; ret == -EBUSY; rest()) ret = ctx.write();
+ EXPECT_LE(0, ret);
EXPECT_TRUE(End_to_End(sync.tagStr, "current=2MB"));
}
{
android_log_event_list ctx(sync.tagNo);
ctx << (uint32_t)2097153;
- ctx.write();
+ for (ret = -EBUSY; ret == -EBUSY; rest()) ret = ctx.write();
+ EXPECT_LE(0, ret);
EXPECT_TRUE(End_to_End(sync.tagStr, "current=2097153B"));
}
{
android_log_event_list ctx(sync.tagNo);
ctx << (uint32_t)1073741824;
- ctx.write();
+ for (ret = -EBUSY; ret == -EBUSY; rest()) ret = ctx.write();
+ EXPECT_LE(0, ret);
EXPECT_TRUE(End_to_End(sync.tagStr, "current=1GB"));
}
{
android_log_event_list ctx(sync.tagNo);
ctx << (uint32_t)3221225472; // 3MB, but on purpose overflowed
- ctx.write();
+ for (ret = -EBUSY; ret == -EBUSY; rest()) ret = ctx.write();
+ EXPECT_LE(0, ret);
EXPECT_TRUE(End_to_End(sync.tagStr, "current=-1GB"));
}
}
@@ -1645,7 +1667,8 @@
{
static const struct tag sync = { 27501, "notification_panel_hidden" };
android_log_event_list ctx(sync.tagNo);
- ctx.write();
+ for (ret = -EBUSY; ret == -EBUSY; rest()) ret = ctx.write();
+ EXPECT_LE(0, ret);
EXPECT_TRUE(End_to_End(sync.tagStr, ""));
}
}