server.nim
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import asynchttpserver, asyncdispatch, times, strutils, pegs, strtabs, cgi
import types, api
proc getReqInfo(req: Request): string =
return $getLocalTime(getTime()) & " - " & req.hostname & " " & req.reqMethod & " " & req.url.path
proc handleCtrlC() {.noconv.} =
echo "\nExiting..."
quit()
proc validOrderBy(clause: string):bool =
return clause == "id ASC" or
clause == "id DESC" or
clause == "created ASC" or
clause == "created DESC" or
clause == "modified ASC" or
clause == "modified DESC"
proc parseQueryOption(fragment: string, options: var QueryOptions) =
var pair = fragment.split('=')
if pair.len < 2:
return
try:
pair[1] = pair[1].decodeURL
except:
raise newException(EInvalidRequest, "Unable to decode query string fragment '$1'" % fragment)
case pair[0]:
of "search":
options.search = pair[1]
of "tags":
options.tags = pair[1]
of "limit":
try:
options.limit = pair[1].parseInt
except:
raise newException(EInvalidRequest, "LIMIT - $1" % getCurrentExceptionMsg())
of "orderby":
if pair[1].validOrderBy():
options.orderby = pair[1]
else:
raise newException(EInvalidRequest, "ORDERBY - Invalid clause '$1'" % pair[1])
else:
return
proc parseQueryOptions(querystring: string, options: var QueryOptions) =
var fragments = querystring.split('&')
for f in fragments:
f.parseQueryOption(options)
proc rDocs(path: string, matches: var seq[string]): bool =
return path.find(peg"""^\/? {(.*)}""", matches) != -1
proc optionsRoutes(req: Request, LS: LiteStore): Response =
var matches = @[""]
if req.url.path.rDocs(matches):
if matches[0] != "":
result.code = Http200
result.content = ""
result.headers = {"Allow": "HEAD,GET,PUT,PATCH,DELETE"}.newStringTable
else:
result.code = Http200
result.content = ""
result.headers = {"Allow": "HEAD,GET,POST,DELETE"}.newStringTable
else:
return resError(Http400, "Bad request: $1" % req.url.path)
proc headRoutes(req: Request, LS: LiteStore): Response =
var matches = @[""]
if req.url.path.rDocs(matches):
var options = newQueryOptions()
options.select = "id, content_type, binary, searchable, created, modified"
try:
parseQueryOptions(req.url.query, options);
if matches[0] != "":
# Retrieve a single document
return LS.getRawDocument(matches[0], options)
else:
# Retrieve a multiple documents
return LS.getRawDocuments(options)
except:
return resError(Http400, "Bad request: $1" % getCurrentExceptionMsg())
else:
return resError(Http400, "Bad request: $1" % req.url.path)
proc getRoutes(req: Request, LS: LiteStore): Response =
var matches = @[""]
if req.url.path.rDocs(matches):
var options = newQueryOptions()
try:
parseQueryOptions(req.url.query, options);
if matches[0] != "":
# Retrieve a single document
if req.url.query.contains("raw=true") or req.headers["Content-Type"] == "application/json":
return LS.getRawDocument(matches[0], options)
else:
return LS.getDocument(matches[0], options)
else:
# Retrieve a multiple documents
return LS.getRawDocuments(options)
except:
return resError(Http400, "Bad request: $1" % getCurrentExceptionMsg())
else:
return resError(Http400, "Bad request: $1" % req.url.path)
proc route(req: Request, LS: LiteStore): Response =
case req.reqMethod:
of "HEAD":
return req.headRoutes(LS)
of "OPTIONS":
return req.optionsRoutes(LS)
of "GET":
return req.getRoutes(LS)
else:
return resError(Http501, "Method $1 not implemented" % req.reqMethod)
setControlCHook(handleCtrlC)
proc serve*(LS: LiteStore) =
var server = newAsyncHttpServer()
proc handleHttpRequest(req: Request): Future[void] {.async.} =
echo getReqInfo(req)
let res = req.route(LS)
await req.respond(res.code, res.content, res.headers)
echo LS.appname, " v", LS.appversion, " started on ", LS.address, ":", LS.port, "."
asyncCheck server.serve(LS.port.Port, handleHttpRequest, LS.address)
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