flux-sql: add sql client

Problem: the job-sql service has no command line client.

Add one.

src/cmd/Makefile.am

@@ -78,7 +78,8 @@ flux_SOURCES = \
 	builtin/restore.c \
 	builtin/archive.c \
 	builtin/pmi.c \
-	builtin/shutdown.c
+	builtin/shutdown.c \
+	builtin/sql.c
 nodist_flux_SOURCES = \
 	builtin-cmds.c
 

src/cmd/builtin/sql.c

@@ -0,0 +1,96 @@
+/************************************************************\
+ * Copyright 2024 Lawrence Livermore National Security, LLC
+ * (c.f. AUTHORS, NOTICE.LLNS, COPYING)
+ *
+ * This file is part of the Flux resource manager framework.
+ * For details, see https://github.com/flux-framework.
+ *
+ * SPDX-License-Identifier: LGPL-3.0
+\************************************************************/
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+#ifdef HAVE_ARGZ_ADD
+#include <argz.h>
+#else
+#include "src/common/libmissing/argz.h"
+#endif
+#include <unistd.h>
+
+#include "builtin.h"
+
+static void query_continuation (flux_future_t *f, void *arg)
+{
+    flux_reactor_t *r = flux_future_get_reactor (f);
+    const char *row;
+
+    if (flux_rpc_get (f, &row) < 0) {
+        if (errno == ENODATA)
+            flux_reactor_stop (r);
+        else {
+            log_msg ("%s", future_strerror (f, errno));
+            flux_reactor_stop_error (r);
+        }
+        return;
+    }
+    printf ("%s\n", row);
+    flux_future_reset (f);
+}
+
+static int cmd_sql (optparse_t *p, int ac, char *av[])
+{
+    int n = optparse_option_index (p);
+    int e;
+    char *argz = NULL;
+    size_t argz_len = 0;
+    flux_t *h;
+    flux_future_t *f;
+    int rc;
+
+    log_init ("flux-sql");
+    if (n == ac) {
+        optparse_print_usage (p);
+        exit (1);
+    }
+    /* Make one SQL query string from one or more query arguments
+     */
+    if ((e = argz_create (&av[n], &argz, &argz_len)) != 0)
+        log_errn_exit (e, "error processing arguments");
+    argz_stringify (argz, argz_len, ' ');
+
+    if (!(h = builtin_get_flux_handle (p)))
+        log_err_exit ("could not contact flux broker");
+
+    if (!(f = flux_rpc_pack (h,
+                             "job-sql.query",
+                             0,
+                             FLUX_RPC_STREAMING,
+                             "{s:s}",
+                             "query", argz))
+        || flux_future_then (f, -1, query_continuation, p) < 0)
+        log_err_exit ("error sending query");
+    rc = flux_reactor_run (flux_get_reactor (h), 0);
+    flux_future_destroy (f);
+
+    flux_close (h);
+    free (argz);
+    return rc;
+}
+
+int subcommand_sql_register (optparse_t *p)
+{
+    if (optparse_reg_subcommand (p,
+                                 "sql",
+                                 cmd_sql,
+                                 "[OPTIONS...] QUERY",
+                                 "Query the SQL job database",
+                                 0,
+                                 NULL) != OPTPARSE_SUCCESS)
+        return -1;
+    return 0;
+}
+
+/*
+ * vi: ts=4 sw=4 expandtab
+ */