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Merge pull request #504 from 3scale/environment-configuration
allow passing multiple environment configuration files
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| --- Environment configuration | ||
| -- @module environment | ||
| -- This module is providing a configuration to APIcast before and during its initialization. | ||
| -- You can load several configuration files. | ||
| -- Fields from the ones added later override fields from the previous configurations. | ||
| local pl_path = require('pl.path') | ||
| local resty_env = require('resty.env') | ||
| local linked_list = require('apicast.linked_list') | ||
| local setmetatable = setmetatable | ||
| local loadfile = loadfile | ||
| local pcall = pcall | ||
| local require = require | ||
| local assert = assert | ||
| local error = error | ||
| local print = print | ||
| local pairs = pairs | ||
| local insert = table.insert | ||
| local concat = table.concat | ||
| local re = require('ngx.re') | ||
|
|
||
| local _M = {} | ||
| --- | ||
| -- @field default_environment Default environment name. | ||
| -- @table self | ||
| _M.default_environment = 'production' | ||
|
|
||
| --- Default configuration. | ||
| -- @tfield ?string ca_bundle path to CA store file | ||
| -- @table environment.default_config default configuration | ||
| _M.default_config = { | ||
| ca_bundle = resty_env.value('SSL_CERT_FILE'), | ||
| } | ||
|
|
||
| local mt = { __index = _M } | ||
|
|
||
| --- Load an environment from files in ENV. | ||
| -- @treturn Environment | ||
| function _M.load() | ||
| local value = resty_env.value('APICAST_LOADED_ENVIRONMENTS') | ||
| local env = _M.new() | ||
|
|
||
| if not value then | ||
| return env | ||
| end | ||
|
|
||
| local environments = re.split(value, '\\|', 'jo') | ||
|
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| for i=1,#environments do | ||
| assert(env:add(environments[i])) | ||
| end | ||
|
|
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| return env | ||
| end | ||
|
|
||
| --- Initialize new environment. | ||
| -- @treturn Environment | ||
| function _M.new() | ||
| return setmetatable({ _context = linked_list.readonly(_M.default_config), loaded = {} }, mt) | ||
| end | ||
|
|
||
| local function expand_environment_name(name) | ||
| local root = resty_env.value('APICAST_DIR') or pl_path.abspath('.') | ||
| local pwd = resty_env.value('PWD') | ||
|
|
||
| local path = pl_path.abspath(name, pwd) | ||
| local exists = pl_path.isfile(path) | ||
|
|
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| if exists then | ||
| return nil, path | ||
| end | ||
|
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| path = pl_path.join(root, 'config', ("%s.lua"):format(name)) | ||
| exists = pl_path.isfile(path) | ||
|
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||
| if exists then | ||
| return name, path | ||
| end | ||
| end | ||
|
|
||
| --------------------- | ||
| --- @type Environment | ||
| -- An instance of @{environment} configuration. | ||
|
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||
| --- Add an environment name or configuration file. | ||
| -- @tparam string env environment name or path to a file | ||
| function _M:add(env) | ||
| local name, path = expand_environment_name(env) | ||
|
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||
| if self.loaded[path] then | ||
| return true, 'already loaded' | ||
| end | ||
|
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||
| if name and path then | ||
| self.name = name | ||
| print('loading ', name ,' environment configuration: ', path) | ||
| elseif path then | ||
| print('loading environment configuration: ', path) | ||
| else | ||
| return nil, 'no configuration found' | ||
| end | ||
|
|
||
| local config = loadfile(path, 't', { | ||
| print = print, inspect = require('inspect'), context = self._context, | ||
| pcall = pcall, require = require, assert = assert, error = error, | ||
| }) | ||
|
|
||
| if not config then | ||
| return nil, 'invalid config' | ||
| end | ||
|
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| self.loaded[path] = true | ||
|
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| self._context = linked_list.readonly(config(), self._context) | ||
|
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| return true | ||
| end | ||
|
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| --- Read/write context | ||
| -- @treturn table context with all loaded environments combined | ||
| function _M:context() | ||
| return linked_list.readwrite({ }, self._context) | ||
| end | ||
|
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||
| --- Store loaded environment file names into ENV. | ||
| function _M:save() | ||
| local environments = {} | ||
|
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| for file,_ in pairs(self.loaded) do | ||
| insert(environments, file) | ||
| end | ||
|
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||
| resty_env.set('APICAST_LOADED_ENVIRONMENTS', concat(environments, '|')) | ||
| end | ||
|
|
||
| return _M |
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