| Function Name | Brief Introduction |
|---|---|
| Version | Returns the |
| current version number of the system | |
| Sleep | Sleep function, |
| parameter is the value of milliseconds to pause | |
| IsVirtual | Determine the |
execution environment, return a true value to indicate a backtest
environment |
| Mail | Send an email |
| Mail_Go | Asynchronous
version of the Mail function |
| SetErrorFilter | Filter error
logs, the parameter is a regular expression string, the error logs
matched by this regular expression will not be uploaded to the logging
system |
| GetPid | Get the bot
process Id |
| GetLastError | Get the last
error message |
| GetCommand | Get strategy
interaction commands, strategy interaction control settings can be
queried: [interaction control](/user-guide#interaction control) |
| GetMeta | Get the value of
Meta written when generating the strategy registration code |
| Dial | Used for raw
socket access |
| HttpQuery | Send Http request |
| HttpQuery_Go | Asynchronous
version of the HttpQuery function |
| Encode | Data encoding
function |
| UnixNano | Get nanosecond
timestamps |
| Unix | Get second-level
timestamps |
| GetOS | Getting system
information |
| MD5 | Calculate MD5 |
| DBExec | Database
functions that can be used to execute SQL statements and perform
database operations |
| UUID | Generate UUID |
| EventLoop | Listen for events
and return after any websocket is readable or concurrent tasks such as
exchange.Go, HttpQuery_Go, etc. are completed, this function
is only available for live tradings |
| _G | Persistently saving data,
this function implements a saveable global dictionary function. The data
structure is a KV table, which is stored in the docker’s local database
file permanently |
| _D | Timestamp handler, converts
a millisecond timestamp or Date object to a time string |
| _N | Formatting a floating point
number, e.g. _N(3.1415, 2) will remove the value of 3.1415 after
two decimal places, and the function returns 3.14 |
| _C | Retry function for
interface fault tolerance. Note that, for example, fault tolerance for
the exchange.GetTicker function is _C(exchange.GetTicker)
and not _C(exchange.GetTicker()) |
| _Cross | Cross judgment function,
_Cross() function’s return value is a positive number indicates
the period of the upward penetration, a negative number indicates the
period of the downward penetration, and 0 refers to the current price of
the same |
| JSONParse | Parsing JSON, which can
correctly parse JSON strings containing larger values, will parse larger
values to a string type. The JSONParse() function is not supported
in the backtesting system. |