Merging upstream version 1.29.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

4 files changed, 251 insertions, 0 deletions

diff --git a/cli/Makefile.am b/cli/Makefile.am
new file mode 100644
index 000000000..161784b8f
--- /dev/null
+++ b/cli/Makefile.am
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
+
+dist_noinst_DATA = \
+    README.md \
+    $(NULL)
diff --git a/cli/README.md b/cli/README.md
new file mode 100644
index 000000000..93812372a
--- /dev/null
+++ b/cli/README.md
@@ -0,0 +1,34 @@
+<!--
+title: "Netdata CLI"
+description: "The Netdata Agent includes a command-line experience for reloading health configuration, reopening log files, halting the daemon, and more."
+custom_edit_url: https://github.com/netdata/netdata/edit/master/cli/README.md
+-->
+
+# Netdata CLI
+
+You can see the commands `netdatacli` supports by executing it with `netdatacli` and entering `help` in
+standard input. All commands are given as standard input to `netdatacli`.
+
+The commands that a running netdata agent can execute are the following:
+
+```sh
+The commands are (arguments are in brackets):
+help
+    Show this help menu.
+reload-health
+    Reload health configuration.
+save-database
+    Save internal DB to disk for for memory mode save.
+reopen-logs
+    Close and reopen log files.
+shutdown-agent
+    Cleanup and exit the netdata agent.
+fatal-agent
+    Log the state and halt the netdata agent.
+reload-claiming-state
+    Reload agent claiming state from disk.
+```
+
+Those commands are the same that can be sent to netdata via [signals](/daemon/README.md#command-line-options).
+
+[![analytics](https://www.google-analytics.com/collect?v=1&aip=1&t=pageview&_s=1&ds=github&dr=https%3A%2F%2Fgithub.com%2Fnetdata%2Fnetdata&dl=https%3A%2F%2Fmy-netdata.io%2Fgithub%2Fcli%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)](<>)
diff --git a/cli/cli.c b/cli/cli.c
new file mode 100644
index 000000000..4df020178
--- /dev/null
+++ b/cli/cli.c
@@ -0,0 +1,201 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "cli.h"
+#include "../libnetdata/required_dummies.h"
+
+static uv_pipe_t client_pipe;
+static uv_write_t write_req;
+static uv_shutdown_t shutdown_req;
+
+static char command_string[MAX_COMMAND_LENGTH];
+static unsigned command_string_size;
+
+static char response_string[MAX_COMMAND_LENGTH];
+static unsigned response_string_size;
+
+static int exit_status;
+
+struct command_context {
+    uv_work_t work;
+    uv_stream_t *client;
+    cmd_t idx;
+    char *args;
+    char *message;
+    cmd_status_t status;
+};
+
+static void parse_command_reply(void)
+{
+    FILE *stream = NULL;
+    char *pos;
+    int syntax_error = 0;
+
+    for (pos = response_string ;
+         pos < response_string + response_string_size  && !syntax_error ;
+         ++pos) {
+        /* Skip white-space characters */
+        for ( ; isspace(*pos) && ('\0' != *pos); ++pos) {;}
+
+        if ('\0' == *pos)
+            continue;
+
+        switch (*pos) {
+        case CMD_PREFIX_EXIT_CODE:
+            exit_status = atoi(++pos);
+            break;
+        case CMD_PREFIX_INFO:
+            stream = stdout;
+            break;
+        case CMD_PREFIX_ERROR:
+            stream = stderr;
+            break;
+        default:
+            syntax_error = 1;
+            fprintf(stderr, "Syntax error, failed to parse command response.\n");
+            break;
+        }
+        if (stream) {
+            fprintf(stream, "%s\n", ++pos);
+            pos += strlen(pos);
+            stream = NULL;
+        }
+    }
+}
+
+static void pipe_read_cb(uv_stream_t *client, ssize_t nread, const uv_buf_t *buf)
+{
+    if (0 == nread) {
+        fprintf(stderr, "%s: Zero bytes read by command pipe.\n", __func__);
+    } else if (UV_EOF == nread) {
+//      fprintf(stderr, "EOF found in command pipe.\n");
+        parse_command_reply();
+    } else if (nread < 0) {
+        fprintf(stderr, "%s: %s\n", __func__, uv_strerror(nread));
+    }
+
+    if (nread < 0) { /* stop stream due to EOF or error */
+        (void)uv_read_stop((uv_stream_t *)client);
+    } else if (nread) {
+        size_t to_copy;
+
+        to_copy = MIN(nread, MAX_COMMAND_LENGTH - 1 - response_string_size);
+        memcpy(response_string + response_string_size, buf->base, to_copy);
+        response_string_size += to_copy;
+        response_string[response_string_size] = '\0';
+    }
+    if (buf && buf->len) {
+        free(buf->base);
+    }
+}
+
+static void alloc_cb(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf)
+{
+    (void)handle;
+
+    buf->base = malloc(suggested_size);
+    buf->len = suggested_size;
+}
+
+static void shutdown_cb(uv_shutdown_t* req, int status)
+{
+    int ret;
+
+    (void)req;
+    (void)status;
+
+    /* receive reply */
+    response_string_size = 0;
+    response_string[0] = '\0';
+
+    ret = uv_read_start((uv_stream_t *)&client_pipe, alloc_cb, pipe_read_cb);
+    if (ret) {
+        fprintf(stderr, "uv_read_start(): %s\n", uv_strerror(ret));
+        uv_close((uv_handle_t *)&client_pipe, NULL);
+        return;
+    }
+
+}
+
+static void pipe_write_cb(uv_write_t* req, int status)
+{
+    int ret;
+
+    (void)req;
+    (void)status;
+
+    ret = uv_shutdown(&shutdown_req, (uv_stream_t *)&client_pipe, shutdown_cb);
+    if (ret) {
+        fprintf(stderr, "uv_shutdown(): %s\n", uv_strerror(ret));
+        uv_close((uv_handle_t *)&client_pipe, NULL);
+        return;
+    }
+}
+
+static void connect_cb(uv_connect_t* req, int status)
+{
+    int ret;
+    uv_buf_t write_buf;
+    char *s;
+
+    (void)req;
+    if (status) {
+        fprintf(stderr, "uv_pipe_connect(): %s\n", uv_strerror(status));
+        fprintf(stderr, "Make sure the netdata service is running.\n");
+        exit(-1);
+    }
+    if (0 == command_string_size) {
+        s = fgets(command_string, MAX_COMMAND_LENGTH, stdin);
+    }
+    (void)s; /* We don't need input to communicate with the server */
+    command_string_size = strlen(command_string);
+
+    write_req.data = &client_pipe;
+    write_buf.base = command_string;
+    write_buf.len = command_string_size;
+    ret = uv_write(&write_req, (uv_stream_t *)&client_pipe, &write_buf, 1, pipe_write_cb);
+    if (ret) {
+        fprintf(stderr, "uv_write(): %s\n", uv_strerror(ret));
+    }
+//  fprintf(stderr, "COMMAND: Sending command: \"%s\"\n", command_string);
+}
+
+int main(int argc, char **argv)
+{
+    int ret, i;
+    static uv_loop_t* loop;
+    uv_connect_t req;
+
+    exit_status = -1; /* default status for when there is no command response from server */
+
+    loop = uv_default_loop();
+
+    ret = uv_pipe_init(loop, &client_pipe, 1);
+    if (ret) {
+        fprintf(stderr, "uv_pipe_init(): %s\n", uv_strerror(ret));
+        return exit_status;
+    }
+
+    command_string_size = 0;
+    command_string[0] = '\0';
+    for (i = 1 ; i < argc ; ++i) {
+        size_t to_copy;
+
+        to_copy = MIN(strlen(argv[i]), MAX_COMMAND_LENGTH - 1 - command_string_size);
+        strncpyz(command_string + command_string_size, argv[i], to_copy);
+        command_string_size += to_copy;
+
+        if (command_string_size < MAX_COMMAND_LENGTH - 1) {
+            command_string[command_string_size++] = ' ';
+        } else {
+            break;
+        }
+    }
+
+    uv_pipe_connect(&req, &client_pipe, PIPENAME, connect_cb);
+
+    uv_run(loop, UV_RUN_DEFAULT);
+
+    uv_close((uv_handle_t *)&client_pipe, NULL);
+
+    return exit_status;
+}
\ No newline at end of file
diff --git a/cli/cli.h b/cli/cli.h
new file mode 100644
index 000000000..9e730a301
--- /dev/null
+++ b/cli/cli.h
@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_CLI_H
+#define NETDATA_CLI_H 1
+
+#include "../daemon/common.h"
+
+#endif //NETDATA_CLI_H