journalctl: add json, export, short and verbose output modes

1 files changed, 324 insertions, 23 deletions

diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
index c947730441..6f4342e597 100644
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -27,15 +27,328 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <sys/poll.h>
+#include <time.h>
 
 #include "sd-journal.h"
 #include "log.h"
+#include "util.h"
 
-static bool arg_follow = true;
+#define PRINT_THRESHOLD 128
+
+static enum {
+        OUTPUT_SHORT,
+        OUTPUT_VERBOSE,
+        OUTPUT_EXPORT,
+        OUTPUT_JSON,
+        _OUTPUT_MAX
+} arg_output = OUTPUT_JSON;
+
+static bool arg_follow = false;
+static bool arg_show_all = false;
+
+static bool contains_unprintable(const void *p, size_t l) {
+        const char *j;
+
+        for (j = p; j < (const char *) p + l; j++)
+                if (*j < ' ' || *j >= 127)
+                        return true;
+
+        return false;
+}
+
+static int output_short(sd_journal *j, unsigned line) {
+        int r;
+        uint64_t realtime;
+        time_t t;
+        struct tm tm;
+        char buf[64];
+        const void *data;
+        size_t length;
+        size_t n = 0;
+
+        assert(j);
+
+        r = sd_journal_get_realtime_usec(j, &realtime);
+        if (r < 0) {
+                log_error("Failed to get realtime: %s", strerror(-r));
+                return r;
+        }
+
+        t = (time_t) (realtime / USEC_PER_SEC);
+        if (strftime(buf, sizeof(buf), "%b %d %H:%M:%S", localtime_r(&t, &tm)) <= 0) {
+                log_error("Failed to format time.");
+                return -EINVAL;
+        }
+
+        fputs(buf, stdout);
+        n += strlen(buf);
+
+        if (sd_journal_get_data(j, "_HOSTNAME", &data, &length) >= 0 &&
+            (arg_show_all || (!contains_unprintable(data, length) &&
+                              length < PRINT_THRESHOLD))) {
+                printf(" %.*s", (int) length - 10, ((const char*) data) + 10);
+                n += length - 10 + 1;
+        }
+
+        if (sd_journal_get_data(j, "MESSAGE", &data, &length) >= 0) {
+                if (arg_show_all)
+                        printf(" %.*s", (int) length - 8, ((const char*) data) + 8);
+                else if (contains_unprintable(data, length))
+                        fputs(" [blob data]", stdout);
+                else if (length - 8 + n < columns())
+                        printf(" %.*s", (int) length - 8, ((const char*) data) + 8);
+                else if (n < columns()) {
+                        char *e;
+
+                        e = ellipsize_mem((const char *) data + 8, length - 8, columns() - n - 2, 90);
+
+                        if (!e)
+                                printf(" %.*s", (int) length - 8, ((const char*) data) + 8);
+                        else
+                                printf(" %s", e);
+
+                        free(e);
+                }
+        }
+
+        fputc('\n', stdout);
+
+        return 0;
+}
+
+static int output_verbose(sd_journal *j, unsigned line) {
+        const void *data;
+        size_t length;
+        char *cursor;
+        uint64_t realtime;
+        char ts[FORMAT_TIMESTAMP_MAX];
+        int r;
+
+        assert(j);
+
+        r = sd_journal_get_realtime_usec(j, &realtime);
+        if (r < 0) {
+                log_error("Failed to get realtime timestamp: %s", strerror(-r));
+                return r;
+        }
+
+        r = sd_journal_get_cursor(j, &cursor);
+        if (r < 0) {
+                log_error("Failed to get cursor: %s", strerror(-r));
+                return r;
+        }
+
+        printf("%s [%s]\n",
+               format_timestamp(ts, sizeof(ts), realtime),
+               cursor);
+
+        free(cursor);
+
+        SD_JOURNAL_FOREACH_DATA(j, data, length) {
+                if (!arg_show_all && (length > PRINT_THRESHOLD ||
+                                      contains_unprintable(data, length))) {
+                        const char *c;
+
+                        c = memchr(data, '=', length);
+                        if (!c) {
+                                log_error("Invalid field.");
+                                return -EINVAL;
+                        }
+
+                        printf("\t%.*s=[blob data]\n",
+                               (int) (c - (const char*) data),
+                               (const char*) data);
+                } else
+                        printf("\t%.*s\n", (int) length, (const char*) data);
+        }
+
+        return 0;
+}
+
+static int output_export(sd_journal *j, unsigned line) {
+        sd_id128_t boot_id;
+        char sid[33];
+        int r;
+        usec_t realtime, monotonic;
+        char *cursor;
+        const void *data;
+        size_t length;
+
+        assert(j);
+
+        r = sd_journal_get_realtime_usec(j, &realtime);
+        if (r < 0) {
+                log_error("Failed to get realtime timestamp: %s", strerror(-r));
+                return r;
+        }
+
+        r = sd_journal_get_monotonic_usec(j, &monotonic, &boot_id);
+        if (r < 0) {
+                log_error("Failed to get monotonic timestamp: %s", strerror(-r));
+                return r;
+        }
+
+        r = sd_journal_get_cursor(j, &cursor);
+        if (r < 0) {
+                log_error("Failed to get cursor: %s", strerror(-r));
+                return r;
+        }
+
+        printf(".cursor=%s\n"
+               ".realtime=%llu\n"
+               ".monotonic=%llu\n"
+               ".boot_id=%s\n",
+               cursor,
+               (unsigned long long) realtime,
+               (unsigned long long) monotonic,
+               sd_id128_to_string(boot_id, sid));
+
+        free(cursor);
+
+        SD_JOURNAL_FOREACH_DATA(j, data, length) {
+
+                if (contains_unprintable(data, length)) {
+                        const char *c;
+                        uint64_t le64;
+
+                        c = memchr(data, '=', length);
+                        if (!c) {
+                                log_error("Invalid field.");
+                                return -EINVAL;
+                        }
+
+                        fwrite(data, c - (const char*) data, 1, stdout);
+                        fputc('\n', stdout);
+                        le64 = htole64(length - (c - (const char*) data) - 1);
+                        fwrite(&le64, sizeof(le64), 1, stdout);
+                        fwrite(c + 1, length - (c - (const char*) data) - 1, 1, stdout);
+                } else
+                        fwrite(data, length, 1, stdout);
+
+                fputc('\n', stdout);
+        }
+
+        fputc('\n', stdout);
+
+        return 0;
+}
+
+static void json_escape(const char* p, size_t l) {
+
+        if (contains_unprintable(p, l)) {
+                bool not_first = false;
+
+                fputs("[ ", stdout);
+
+                while (l > 0) {
+                        if (not_first)
+                                printf(", %u", (uint8_t) *p);
+                        else {
+                                not_first = true;
+                                printf("%u", (uint8_t) *p);
+                        }
+
+                        p++;
+                        l--;
+                }
+
+                fputs(" ]", stdout);
+        } else {
+                fputc('\"', stdout);
+
+                while (l > 0) {
+                        if (*p == '"' || *p == '\\') {
+                                fputc('\\', stdout);
+                                fputc(*p, stdout);
+                        } else
+                                fputc(*p, stdout);
+
+                        p++;
+                        l--;
+                }
+
+                fputc('\"', stdout);
+        }
+}
+
+static int output_json(sd_journal *j, unsigned line) {
+        uint64_t realtime, monotonic;
+        char *cursor;
+        const void *data;
+        size_t length;
+        sd_id128_t boot_id;
+        char sid[33];
+        int r;
+
+        assert(j);
+
+        r = sd_journal_get_realtime_usec(j, &realtime);
+        if (r < 0) {
+                log_error("Failed to get realtime timestamp: %s", strerror(-r));
+                return r;
+        }
+
+        r = sd_journal_get_monotonic_usec(j, &monotonic, &boot_id);
+        if (r < 0) {
+                log_error("Failed to get monotonic timestamp: %s", strerror(-r));
+                return r;
+        }
+
+        r = sd_journal_get_cursor(j, &cursor);
+        if (r < 0) {
+                log_error("Failed to get cursor: %s", strerror(-r));
+                return r;
+        }
+
+        if (line == 1)
+                fputc('\n', stdout);
+        else
+                fputs(",\n", stdout);
+
+        printf("{\n"
+               "\t\".cursor\" : \"%s\",\n"
+               "\t\".realtime\" : %llu,\n"
+               "\t\".monotonic\" : %llu,\n"
+               "\t\".boot_id\" : \"%s\"",
+               cursor,
+               (unsigned long long) realtime,
+               (unsigned long long) monotonic,
+               sd_id128_to_string(boot_id, sid));
+
+        free(cursor);
+
+        SD_JOURNAL_FOREACH_DATA(j, data, length) {
+                const char *c;
+
+                c = memchr(data, '=', length);
+                if (!c) {
+                        log_error("Invalid field.");
+                        return -EINVAL;
+                }
+
+                fputs(",\n\t", stdout);
+                json_escape(data, c - (const char*) data);
+                fputs(" : ", stdout);
+                json_escape(c + 1, length - (c - (const char*) data) - 1);
+        }
+
+        fputs("\n}", stdout);
+        fflush(stdout);
+
+        return 0;
+}
+
+static int (*output_funcs[_OUTPUT_MAX])(sd_journal*j, unsigned line) = {
+        [OUTPUT_SHORT] = output_short,
+        [OUTPUT_VERBOSE] = output_verbose,
+        [OUTPUT_EXPORT] = output_export,
+        [OUTPUT_JSON] = output_json
+};
 
 int main(int argc, char *argv[]) {
         int r, i, fd;
         sd_journal *j = NULL;
+        unsigned line = 0;
 
         log_set_max_level(LOG_DEBUG);
         log_set_target(LOG_TARGET_CONSOLE);
@@ -69,33 +382,18 @@ int main(int argc, char *argv[]) {
                 goto finish;
         }
 
+        if (arg_output == OUTPUT_JSON)
+                fputc('[', stdout);
+
         for (;;) {
                 struct pollfd pollfd;
 
                 while (sd_journal_next(j) > 0) {
-                        const void *data;
-                        size_t length;
-                        char *cursor;
-                        uint64_t realtime = 0, monotonic = 0;
-
-                        r = sd_journal_get_cursor(j, &cursor);
-                        if (r < 0) {
-                                log_error("Failed to get cursor: %s", strerror(-r));
-                                goto finish;
-                        }
-
-                        printf("entry: %s\n", cursor);
-                        free(cursor);
+                        line ++;
 
-                        sd_journal_get_realtime_usec(j, &realtime);
-                        sd_journal_get_monotonic_usec(j, &monotonic, NULL);
-                        printf("realtime: %llu\n"
-                               "monotonic: %llu\n",
-                               (unsigned long long) realtime,
-                               (unsigned long long) monotonic);
-
-                        SD_JOURNAL_FOREACH_DATA(j, data, length)
-                                printf("\t%.*s\n", (int) length, (const char*) data);
+                        r = output_funcs[arg_output](j, line);
+                        if (r < 0)
+                                goto finish;
                 }
 
                 if (!arg_follow)
@@ -121,6 +419,9 @@ int main(int argc, char *argv[]) {
                 }
         }
 
+        if (arg_output == OUTPUT_JSON)
+                fputs("\n]\n", stdout);
+
 finish:
         if (j)
                 sd_journal_close(j);