api: vat2 and json autogeneration for api messages

VAT2: A completely auto-generated replacement of VAT.
Reads input message in JSON from stdin and outputs received messages in JSON.

A VAT2 plugin is automatically built for a .api file.
There no longer a need for a separate _test.c.

Example:
vat2 show_version {}
{
        "_msgname":     "show_version_reply",
        "retval":       0,
        "program":      "vpe",
        "version":      "21.01-rc0~411-gf6eb348a6",
        "build_date":   "2020-11-19T09:49:25",
        "build_directory":      "/vpp/autogen3"
}

vat2 sw_interface_dump '{"sw_if_index": -1,
                         "name_filter_valid": 0,
                         "name_filter": ""}'
[{
                "_msgname":     "sw_interface_details",
                "sw_if_index":  0,
                "sup_sw_if_index":      0,
                "l2_address":   "00:00:00:00:00:00",
                "flags":        "Invalid ENUM",
                "type": "IF_API_TYPE_HARDWARE",
                "link_duplex":  "LINK_DUPLEX_API_UNKNOWN",
                "link_speed":   0,
                "link_mtu":     0,
                "mtu":  [0, 0, 0, 0],
                "sub_id":       0,
                "sub_number_of_tags":   0,
                "sub_outer_vlan_id":    0,
                "sub_inner_vlan_id":    0,
                "sub_if_flags": "Invalid ENUM",
                "vtr_op":       0,
                "vtr_push_dot1q":       0,
                "vtr_tag1":     0,
                "vtr_tag2":     0,
                "outer_tag":    0,
                "b_dmac":       "00:00:00:00:00:00",
                "b_smac":       "00:00:00:00:00:00",
                "b_vlanid":     0,
                "i_sid":        0,
                "interface_name":       "local0",
                "interface_dev_type":   "local",
                "tag":  ""
        }]

This is the first phase and vat2 is not integrated in packaging yet.

Type: feature
Signed-off-by: Ole Troan <ot@cisco.com>
Change-Id: Ib45ddeafb180ea7da8c5dc274a9274d7a4edc876
Signed-off-by: Ole Troan <ot@cisco.com>

1 files changed, 514 insertions, 0 deletions

diff --git a/src/vat2/jsonconvert.c b/src/vat2/jsonconvert.c
new file mode 100644
index 00000000000..3aeaeedb2f7
--- /dev/null
+++ b/src/vat2/jsonconvert.c
@@ -0,0 +1,514 @@
+/*
+ * Copyright (c) 2020 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vppinfra/cJSON.h>
+#include <vnet/ethernet/mac_address.h>
+#include <vnet/ip/ip6_packet.h>
+#include <vnet/ip/ip_format_fns.h>
+#include <vpp/api/types.h>
+#include "jsonconvert.h"
+
+#define _(T)                                    \
+int vl_api_ ##T## _fromjson(cJSON *o, T *d)     \
+{                                               \
+    if (!cJSON_IsNumber(o)) return -1;          \
+    memcpy(d, &o->valueint, sizeof(T));         \
+    return 0;                                   \
+}
+  foreach_vat2_fromjson
+#undef _
+
+int vl_api_bool_fromjson(cJSON *o, bool *d)
+{
+    if (!cJSON_IsBool(o)) return -1;
+    *d = o->valueint ? true : false;
+    return 0;
+}
+
+int vl_api_u8_string_fromjson(cJSON *o, u8 *s, int len)
+{
+    unformat_input_t input;
+    char *p = cJSON_GetStringValue(o);
+    unformat_init_string (&input, p, strlen(p));
+    unformat(&input, "0x%U", unformat_hex_string, s);
+    return 0;
+}
+
+u8 *
+u8string_fromjson(cJSON *o, char *fieldname)
+{
+    u8 *s = 0;
+    unformat_input_t input;
+    cJSON *item = cJSON_GetObjectItem(o, fieldname);
+    if (!item) {
+        printf("Illegal JSON, no such fieldname %s\n", fieldname);
+        return 0;
+    }
+
+    char *p = cJSON_GetStringValue(item);
+    unformat_init_string (&input, p, strlen(p));
+    unformat(&input, "0x%U", unformat_hex_string, &s);
+    return s;
+}
+
+int
+u8string_fromjson2(cJSON *o, char *fieldname, u8 *data)
+{
+    u8 *s = u8string_fromjson(o, fieldname);
+    if (!s) return 0;
+    memcpy(data, s, vec_len(s));
+    vec_free(s);
+    return 0;
+}
+
+/* Parse an IP4 address %d.%d.%d.%d. */
+uword
+unformat_ip4_address (unformat_input_t * input, va_list * args)
+{
+  u8 *result = va_arg (*args, u8 *);
+  unsigned a[4];
+
+  if (!unformat (input, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]))
+    return 0;
+
+  if (a[0] >= 256 || a[1] >= 256 || a[2] >= 256 || a[3] >= 256)
+    return 0;
+
+  result[0] = a[0];
+  result[1] = a[1];
+  result[2] = a[2];
+  result[3] = a[3];
+
+  return 1;
+}
+
+/* Parse an IP6 address. */
+uword
+unformat_ip6_address (unformat_input_t * input, va_list * args)
+{
+  ip6_address_t *result = va_arg (*args, ip6_address_t *);
+  u16 hex_quads[8];
+  uword hex_quad, n_hex_quads, hex_digit, n_hex_digits;
+  uword c, n_colon, double_colon_index;
+
+  n_hex_quads = hex_quad = n_hex_digits = n_colon = 0;
+  double_colon_index = ARRAY_LEN (hex_quads);
+  while ((c = unformat_get_input (input)) != UNFORMAT_END_OF_INPUT)
+    {
+      hex_digit = 16;
+      if (c >= '0' && c <= '9')
+        hex_digit = c - '0';
+      else if (c >= 'a' && c <= 'f')
+        hex_digit = c + 10 - 'a';
+      else if (c >= 'A' && c <= 'F')
+        hex_digit = c + 10 - 'A';
+      else if (c == ':' && n_colon < 2)
+        n_colon++;
+      else
+        {
+          unformat_put_input (input);
+          break;
+        }
+
+      /* Too many hex quads. */
+      if (n_hex_quads >= ARRAY_LEN (hex_quads))
+        return 0;
+
+      if (hex_digit < 16)
+        {
+          hex_quad = (hex_quad << 4) | hex_digit;
+
+          /* Hex quad must fit in 16 bits. */
+          if (n_hex_digits >= 4)
+            return 0;
+
+          n_colon = 0;
+          n_hex_digits++;
+        }
+
+      /* Save position of :: */
+      if (n_colon == 2)
+        {
+          /* More than one :: ? */
+          if (double_colon_index < ARRAY_LEN (hex_quads))
+            return 0;
+          double_colon_index = n_hex_quads;
+        }
+
+      if (n_colon > 0 && n_hex_digits > 0)
+        {
+          hex_quads[n_hex_quads++] = hex_quad;
+          hex_quad = 0;
+          n_hex_digits = 0;
+        }
+    }
+
+  if (n_hex_digits > 0)
+    hex_quads[n_hex_quads++] = hex_quad;
+
+
+  {
+    word i;
+
+    /* Expand :: to appropriate number of zero hex quads. */
+    if (double_colon_index < ARRAY_LEN (hex_quads))
+      {
+        word n_zero = ARRAY_LEN (hex_quads) - n_hex_quads;
+
+        for (i = n_hex_quads - 1; i >= (signed) double_colon_index; i--)
+          hex_quads[n_zero + i] = hex_quads[i];
+
+        for (i = 0; i < n_zero; i++)
+          {
+            ASSERT ((double_colon_index + i) < ARRAY_LEN (hex_quads));
+            hex_quads[double_colon_index + i] = 0;
+          }
+
+        n_hex_quads = ARRAY_LEN (hex_quads);
+      }
+
+    /* Too few hex quads given. */
+    if (n_hex_quads < ARRAY_LEN (hex_quads))
+      return 0;
+
+    for (i = 0; i < ARRAY_LEN (hex_quads); i++)
+      result->as_u16[i] = clib_host_to_net_u16 (hex_quads[i]);
+
+    return 1;
+  }
+}
+
+u8 *
+format_ip6_address (u8 * s, va_list * args)
+{
+  ip6_address_t *a = va_arg (*args, ip6_address_t *);
+  u32 max_zero_run = 0, this_zero_run = 0;
+  int max_zero_run_index = -1, this_zero_run_index = 0;
+  int in_zero_run = 0, i;
+  int last_double_colon = 0;
+
+  /* Ugh, this is a pain. Scan forward looking for runs of 0's */
+  for (i = 0; i < ARRAY_LEN (a->as_u16); i++)
+    {
+      if (a->as_u16[i] == 0)
+        {
+          if (in_zero_run)
+            this_zero_run++;
+          else
+            {
+              in_zero_run = 1;
+              this_zero_run = 1;
+              this_zero_run_index = i;
+            }
+        }
+      else
+        {
+          if (in_zero_run)
+            {
+              /* offer to compress the biggest run of > 1 zero */
+              if (this_zero_run > max_zero_run && this_zero_run > 1)
+                {
+                  max_zero_run_index = this_zero_run_index;
+                  max_zero_run = this_zero_run;
+                }
+            }
+          in_zero_run = 0;
+          this_zero_run = 0;
+        }
+    }
+
+  if (in_zero_run)
+    {
+      if (this_zero_run > max_zero_run && this_zero_run > 1)
+        {
+          max_zero_run_index = this_zero_run_index;
+          max_zero_run = this_zero_run;
+        }
+    }
+
+  for (i = 0; i < ARRAY_LEN (a->as_u16); i++)
+    {
+      if (i == max_zero_run_index)
+        {
+          s = format (s, "::");
+          i += max_zero_run - 1;
+          last_double_colon = 1;
+        }
+      else
+        {
+          s = format (s, "%s%x",
+                      (last_double_colon || i == 0) ? "" : ":",
+                      clib_net_to_host_u16 (a->as_u16[i]));
+          last_double_colon = 0;
+        }
+    }
+
+  return s;
+}
+
+void *vl_api_ip4_address_t_fromjson(void *mp, int *len, cJSON *o, vl_api_ip4_address_t *a)
+{
+    unformat_input_t input;
+    char *p = cJSON_GetStringValue(o);
+    if (!p) return 0;
+    unformat_init_string (&input, p, strlen(p));
+    unformat(&input, "%U", unformat_ip4_address, a);
+    return mp;
+}
+
+void *vl_api_ip4_prefix_t_fromjson(void *mp, int *len, cJSON *o, vl_api_ip4_prefix_t *a)
+{
+    unformat_input_t input;
+    char *p = cJSON_GetStringValue(o);
+    if (!p) return 0;
+    unformat_init_string (&input, p, strlen(p));
+    unformat(&input, "%U/%d", unformat_ip4_address, &a->address, &a->len);
+    return mp;
+}
+
+void *vl_api_ip4_address_with_prefix_t_fromjson(void *mp, int *len, cJSON *o, vl_api_ip4_prefix_t *a)
+{
+  return vl_api_ip4_prefix_t_fromjson(mp, len, o, a);
+}
+void *vl_api_ip6_address_t_fromjson(void *mp, int *len, cJSON *o, vl_api_ip6_address_t *a)
+{
+    unformat_input_t input;
+    char *p = cJSON_GetStringValue(o);
+    if (!p) return 0;
+    unformat_init_string (&input, p, strlen(p));
+    unformat(&input, "%U", unformat_ip6_address, a);
+    return mp;
+}
+
+void *vl_api_ip6_prefix_t_fromjson(void *mp, int *len, cJSON *o, vl_api_ip6_prefix_t *a)
+{
+  unformat_input_t input;
+  char *p = cJSON_GetStringValue(o);
+  if (!p) return 0;
+  unformat_init_string (&input, p, strlen(p));
+  unformat(&input, "%U/%d", unformat_ip6_address, &a->address, &a->len);
+  return mp;
+}
+
+void *vl_api_ip6_address_with_prefix_t_fromjson(void *mp, int *len, cJSON *o, vl_api_ip6_prefix_t *a)
+{
+  return vl_api_ip6_prefix_t_fromjson(mp, len, o, a);
+}
+
+void *vl_api_address_t_fromjson(void *mp, int *len, cJSON *o, vl_api_address_t *a)
+{
+  unformat_input_t input;
+
+  char *p = cJSON_GetStringValue(o);
+  if (!p) return 0;
+  unformat_init_string (&input, p, strlen(p));
+  if (a->af == ADDRESS_IP4)
+    unformat(&input, "%U", unformat_ip4_address, &a->un.ip4);
+  else if (a->af == ADDRESS_IP6)
+    unformat(&input, "%U", unformat_ip6_address, &a->un.ip6);
+  else
+    return 0;
+  return mp;
+}
+
+void *vl_api_prefix_t_fromjson(void *mp, int *len, cJSON *o, vl_api_prefix_t *a)
+{
+  unformat_input_t input;
+
+  char *p = cJSON_GetStringValue(o);
+  if (!p) return 0;
+  unformat_init_string (&input, p, strlen(p));
+  if (a->address.af == ADDRESS_IP4)
+    unformat(&input, "%U/%d", unformat_ip4_address, &a->address.un.ip4, &a->len);
+  else if (a->address.af == ADDRESS_IP6)
+    unformat(&input, "%U/%d", unformat_ip6_address, &a->address.un.ip6, &a->len);
+  else
+    return 0;
+  return mp;
+}
+
+void *vl_api_address_with_prefix_t_fromjson(void *mp, int *len, cJSON *o, vl_api_prefix_t *a)
+{
+  return vl_api_prefix_t_fromjson(mp, len, o, a);
+}
+
+uword
+unformat_mac_address (unformat_input_t * input, va_list * args)
+{
+  mac_address_t *mac = va_arg (*args, mac_address_t *);
+  u32 i, a[3];
+
+  if (unformat (input, "%_%X:%X:%X:%X:%X:%X%_",
+                1, &mac->bytes[0], 1, &mac->bytes[1], 1, &mac->bytes[2],
+                1, &mac->bytes[3], 1, &mac->bytes[4], 1, &mac->bytes[5]))
+    return (1);
+  else if (unformat (input, "%_%x.%x.%x%_", &a[0], &a[1], &a[2]))
+    {
+      for (i = 0; i < ARRAY_LEN (a); i++)
+        if (a[i] >= (1 << 16))
+          return 0;
+
+      mac->bytes[0] = (a[0] >> 8) & 0xff;
+      mac->bytes[1] = (a[0] >> 0) & 0xff;
+      mac->bytes[2] = (a[1] >> 8) & 0xff;
+      mac->bytes[3] = (a[1] >> 0) & 0xff;
+      mac->bytes[4] = (a[2] >> 8) & 0xff;
+      mac->bytes[5] = (a[2] >> 0) & 0xff;
+
+      return (1);
+    }
+  return (0);
+}
+
+void *vl_api_mac_address_t_fromjson(void *mp, int *len, cJSON *o, vl_api_mac_address_t *a)
+{
+  unformat_input_t input;
+
+  char *p = cJSON_GetStringValue(o);
+  unformat_init_string (&input, p, strlen(p));
+  unformat(&input, "%U", unformat_mac_address, a);
+  return mp;
+}
+
+/* Format an IP4 address. */
+u8 *
+format_ip4_address (u8 * s, va_list * args)
+{
+  u8 *a = va_arg (*args, u8 *);
+  return format (s, "%d.%d.%d.%d", a[0], a[1], a[2], a[3]);
+}
+
+int
+vl_api_c_string_to_api_string (const char *buf, vl_api_string_t * str)
+{
+  /* copy without nul terminator */
+  u32 len = strlen (buf);
+  if (len > 0)
+    clib_memcpy_fast (str->buf, buf, len);
+  str->length = htonl (len);
+  return len + sizeof (u32);
+}
+
+u8 *
+format_vl_api_interface_index_t (u8 *s, va_list *args)
+{
+  u32 *a = va_arg (*args, u32 *);
+  return format (s, "%u", *a);
+}
+
+uword
+unformat_vl_api_interface_index_t (unformat_input_t * input, va_list * args)
+{
+    u32 *a = va_arg (*args, u32 *);
+
+    if (!unformat (input, "%u", a))
+        return 0;
+    return 1;
+}
+
+void
+vl_api_string_cJSON_AddToObject(cJSON * const object, const char * const name, vl_api_string_t *astr)
+{
+
+    if (astr == 0) return;
+    u32 length = clib_net_to_host_u32 (astr->length);
+
+    char *cstr = malloc(length + 1);
+    memcpy(cstr, astr->buf, length);
+    cstr[length] = '\0';
+    cJSON_AddStringToObject(object, name, cstr);
+    free(cstr);
+}
+
+u8 *
+format_vl_api_timestamp_t(u8 * s, va_list * args)
+{
+    f64 timestamp = va_arg (*args, f64);
+    struct tm *tm;
+    word msec;
+
+    time_t t = timestamp;
+    tm = gmtime (&t);
+    msec = 1e6 * (timestamp - t);
+    return format (s, "%4d-%02d-%02dT%02d:%02d:%02d.%06dZ", 1900 + tm->tm_year,
+                   1 + tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min,
+                   tm->tm_sec, msec);
+}
+
+u8 *
+format_vl_api_timedelta_t(u8 * s, va_list * args)
+{
+    return format_vl_api_timestamp_t(s, args);
+}
+
+uword
+unformat_vl_api_timedelta_t(unformat_input_t * input, va_list * args)
+{
+    return 0;
+}
+
+uword
+unformat_vl_api_timestamp_t(unformat_input_t * input, va_list * args)
+{
+    return 0;
+}
+u8 *format_vl_api_gbp_scope_t(u8 * s, va_list * args)
+{
+    return 0;
+}
+uword unformat_vl_api_gbp_scope_t(unformat_input_t * input, va_list * args)
+{
+    return 0;
+}
+
+cJSON *
+vl_api_ip4_address_with_prefix_t_tojson (vl_api_ip4_prefix_t *a) {
+  u8 *s = format(0, "%U", format_vl_api_ip4_address_t, a);
+  cJSON *o = cJSON_CreateString((char *)s);
+  vec_free(s);
+  return o;
+}
+cJSON *
+vl_api_ip6_address_with_prefix_t_tojson (vl_api_ip6_prefix_t *a) {
+  u8 *s = format(0, "%U", format_vl_api_ip6_address_t, a);
+  cJSON *o = cJSON_CreateString((char *)s);
+  vec_free(s);
+  return o;
+}
+cJSON *
+vl_api_address_with_prefix_t_tojson (vl_api_prefix_t *a) {
+  u8 *s = format(0, "%U", format_vl_api_address_t, a);
+  cJSON *o = cJSON_CreateString((char *)s);
+  vec_free(s);
+  return o;
+}
+u8 *
+format_vl_api_mac_address_t (u8 * s, va_list * args)
+{
+  const mac_address_t *mac = va_arg (*args, mac_address_t *);
+
+  return format (s, "%02x:%02x:%02x:%02x:%02x:%02x",
+                 mac->bytes[0], mac->bytes[1], mac->bytes[2],
+                 mac->bytes[3], mac->bytes[4], mac->bytes[5]);
+}
+#define _(T)                                                \
+  cJSON *vl_api_ ##T## _t_tojson (vl_api_ ##T## _t *a) {   \
+  u8 *s = format(0, "%U", format_vl_api_ ##T## _t, a);      \
+  cJSON *o = cJSON_CreateString((char *)s);                 \
+  vec_free(s);                                              \
+  return o;                                                 \
+  }
+foreach_vat2_tojson
+#undef _