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_ubus_call set
  71 }
  72
  73 _procd_add_array_data() {
  74         while [ -n "$1" ]; do
  75                 json_add_string "" "$1"
  76                 shift
  77         done
  78 }
  79
  80 _procd_add_array() {
  81         json_add_array "$1"
  82         shift
  83         _procd_add_array_data "$@"
  84         json_close_array
  85 }
  86
  87 _procd_add_table_data() {
  88         while [ -n "$1" ]; do
  89                 local var="${1%%=*}"
  90                 local val="${1#*=}"
  91                 [[ "$1" == "$val" ]] && val=
  92                 json_add_string "$var" "$val"
  93                 shift
  94         done
  95 }
  96
  97 _procd_add_table() {
  98         json_add_object "$1"
  99         shift
 100         _procd_add_table_data "$@"
 101         json_close_object
 102 }
 103
 104 _procd_open_instance() {
 105         local name="$1"; shift
 106
 107         _PROCD_INSTANCE_SEQ="$(($_PROCD_INSTANCE_SEQ + 1))"
 108         name="${name:-instance$_PROCD_INSTANCE_SEQ}"
 109         json_add_object "$name"
 110 }
 111
 112 _procd_open_trigger() {
 113         json_add_array "triggers"
 114 }
 115
 116 _procd_set_param() {
 117         local type="$1"; shift
 118
 119         case "$type" in
 120                 env|data)
 121                         _procd_add_table "$type" "$@"
 122                 ;;
 123                 command|netdev|file)
 124                         _procd_add_array "$type" "$@"
 125                 ;;
 126                 nice)
 127                         json_add_int "$type" "$1"
 128                 ;;
 129         esac
 130 }
 131
 132 _procd_add_config_trigger() {
 133         json_add_array
 134         _procd_add_array_data "config.change"
 135
 136         json_add_array
 137         _procd_add_array_data "if"
 138
 139         json_add_array
 140         _procd_add_array_data "eq" "package" "$1"
 141         shift
 142         json_close_array
 143
 144         json_add_array
 145         _procd_add_array_data "run_script" "$@"
 146         json_close_array
 147
 148         json_close_array
 149
 150         json_close_array
 151 }
 152
 153 _procd_append_param() {
 154         local type="$1"; shift
 155
 156         json_select "$type"
 157         case "$type" in
 158                 env|data)
 159                         _procd_add_table_data "$@"
 160                 ;;
 161                 command|netdev|file)
 162                         _procd_add_array_data "$@"
 163                 ;;
 164         esac
 165         json_select ..
 166 }
 167
 168 _procd_close_instance() {
 169         json_close_object
 170 }
 171
 172 _procd_close_trigger() {
 173         json_close_array
 174 }
 175
 176 _procd_add_instance() {
 177         _procd_open_instance
 178         _procd_set_command "$@"
 179         _procd_close_instance
 180 }
 181
 182 _procd_kill() {
 183         local service="$1"
 184         local instance="$2"
 185
 186         json_init
 187         [ -n "$service" ] && json_add_string name "$service"
 188         [ -n "$instance" ] && json_add_string instance "$instance"
 189         _procd_ubus_call delete
 190 }
 191
 192 _procd_wrapper \
 193         procd_open_service \
 194         procd_close_service \
 195         procd_add_instance \
 196         procd_add_config_trigger \
 197         procd_open_trigger \
 198         procd_close_trigger \
 199         procd_open_instance \
 200         procd_close_instance \
 201         procd_set_param \
 202         procd_append_param \
 203         procd_kill