package/system/procd/files/procd.sh

   1 # procd API:
   2 #
   3 # procd_open_service(name, [script]):
   4 #   Initialize a new procd command message containing a service with one or more instances
   5 #
   6 # procd_close_service()
   7 #   Send the command message for the service
   8 #
   9 # procd_open_instance([name]):
  10 #   Add an instance to the service described by the previous procd_open_service call
  11 #
  12 # procd_set_param(type, [value...])
  13 #   Available types:
  14 #     command: command line (array).
  15 #     env: environment variable (passed to the process)
  16 #     data: arbitrary name/value pairs for detecting config changes (table)
  17 #     file: configuration files (array)
  18 #     netdev: bound network device (detects ifindex changes)
  19 #
  20 #   No space separation is done for arrays/tables - use one function argument per command line argument
  21 #
  22 # procd_close_instance():
  23 #   Complete the instance being prepared
  24 #
  25 # procd_kill(service, [instance]):
  26 #   Kill a service instance (or all instances)
  27 #
  28
  29 . $IPKG_INSTROOT/usr/share/libubox/jshn.sh
  30
  31 _PROCD_SERVICE=
  32
  33 _procd_call() {
  34         local old_cb
  35
  36         json_set_namespace procd old_cb
  37         "$@"
  38         json_set_namespace $old_cb
  39 }
  40
  41 _procd_wrapper() {
  42         while [ -n "$1" ]; do
  43                 eval "$1() { _procd_call _$1 \"\$@\"; }"
  44                 shift
  45         done
  46 }
  47
  48 _procd_ubus_call() {
  49         local cmd="$1"
  50
  51         ubus call service "$cmd" "$(json_dump)"
  52         json_cleanup
  53 }
  54
  55 _procd_open_service() {
  56         local name="$1"
  57         local script="$2"
  58
  59         _PROCD_SERVICE="$name"
  60         _PROCD_INSTANCE_SEQ=0
  61
  62         json_init
  63         json_add_string name "$name"
  64         [ -n "$script" ] && json_add_string script "$script"
  65         json_add_object instances
  66 }
  67
  68 _procd_close_service() {
  69         json_close_object
  70         _procd_open_trigger
  71         service_triggers
  72         _procd_close_trigger
  73         _procd_ubus_call set
  74 }
  75
  76 _procd_add_array_data() {
  77         while [ -n "$1" ]; do
  78                 json_add_string "" "$1"
  79                 shift
  80         done
  81 }
  82
  83 _procd_add_array() {
  84         json_add_array "$1"
  85         shift
  86         _procd_add_array_data "$@"
  87         json_close_array
  88 }
  89
  90 _procd_add_table_data() {
  91         while [ -n "$1" ]; do
  92                 local var="${1%%=*}"
  93                 local val="${1#*=}"
  94                 [[ "$1" == "$val" ]] && val=
  95                 json_add_string "$var" "$val"
  96                 shift
  97         done
  98 }
  99
 100 _procd_add_table() {
 101         json_add_object "$1"
 102         shift
 103         _procd_add_table_data "$@"
 104         json_close_object
 105 }
 106
 107 _procd_open_instance() {
 108         local name="$1"; shift
 109
 110         _PROCD_INSTANCE_SEQ="$(($_PROCD_INSTANCE_SEQ + 1))"
 111         name="${name:-instance$_PROCD_INSTANCE_SEQ}"
 112         json_add_object "$name"
 113 }
 114
 115 _procd_open_trigger() {
 116         json_add_array "triggers"
 117 }
 118
 119 _procd_set_param() {
 120         local type="$1"; shift
 121
 122         case "$type" in
 123                 env|data)
 124                         _procd_add_table "$type" "$@"
 125                 ;;
 126                 command|netdev|file)
 127                         _procd_add_array "$type" "$@"
 128                 ;;
 129                 nice)
 130                         json_add_int "$type" "$1"
 131                 ;;
 132         esac
 133 }
 134
 135 _procd_add_config_trigger() {
 136         json_add_array
 137         _procd_add_array_data "config.change"
 138
 139         json_add_array
 140         _procd_add_array_data "if"
 141
 142         json_add_array
 143         _procd_add_array_data "eq" "package" "$1"
 144         shift
 145         json_close_array
 146
 147         json_add_array
 148         _procd_add_array_data "run_script" "$@"
 149         json_close_array
 150
 151         json_close_array
 152
 153         json_close_array
 154 }
 155
 156 _procd_append_param() {
 157         local type="$1"; shift
 158
 159         json_select "$type"
 160         case "$type" in
 161                 env|data)
 162                         _procd_add_table_data "$@"
 163                 ;;
 164                 command|netdev|file)
 165                         _procd_add_array_data "$@"
 166                 ;;
 167         esac
 168         json_select ..
 169 }
 170
 171 _procd_close_instance() {
 172         json_close_object
 173 }
 174
 175 _procd_close_trigger() {
 176         json_close_array
 177 }
 178
 179 _procd_add_instance() {
 180         _procd_open_instance
 181         _procd_set_command "$@"
 182         _procd_close_instance
 183 }
 184
 185 _procd_kill() {
 186         local service="$1"
 187         local instance="$2"
 188
 189         json_init
 190         [ -n "$service" ] && json_add_string name "$service"
 191         [ -n "$instance" ] && json_add_string instance "$instance"
 192         _procd_ubus_call delete
 193 }
 194
 195 _procd_wrapper \
 196         procd_open_service \
 197         procd_close_service \
 198         procd_add_instance \
 199         procd_add_config_trigger \
 200         procd_open_trigger \
 201         procd_close_trigger \
 202         procd_open_instance \
 203         procd_close_instance \
 204         procd_set_param \
 205         procd_append_param \
 206         procd_kill