Templating¶
Hoverfly can build responses dynamically through templating. This is particularly useful when combined with loose matching, as it allows a single matcher to represent an unlimited combination of responses.
Enabling Templating¶
By default templating is disabled. In order to enable it, set the templated field to true in the response of a simulation.
Getting data from the request¶
Currently, you can get the following data from request to the response via templating:
| Field | Example | Request | Result |
|---|---|---|---|
| Request scheme | {{ Request.Scheme }} | http://www.foo.com | http |
| Query parameter value | {{ Request.QueryParam.myParam }} | http://www.foo.com?myParam=bar | bar |
| Query parameter value (list) | {{ Request.QueryParam.NameOfParameter.[1] }} | http://www.foo.com?myParam=bar1&myParam=bar2 | bar2 |
| Path parameter value | {{ Request.Path.[1] }} | http://www.foo.com/zero/one/two | one |
| Method | {{ Request.Method }} | http://www.foo.com/zero/one/two | GET |
| jsonpath on body | {{ Request.Body “jsonpath” “$.test” }} | { “id”: 123, “username”: “hoverfly” } | 123 |
| xpath on body | {{ Request.Body “xpath” “/root/id” }} | <root><id>123</id></root> | 123 |
| State | {{ State.basket }} | State Store = {“basket”:”eggs”} | eggs |
Helper Methods¶
Additional data can come from helper methods. These are the ones Hoverfly currently support:
| Description | Example | Result |
|---|---|---|
| The current UTC date time, formatted in iso8601 | {{ iso8601DateTime }} | 2006-01-02T15:04:05Z |
| The current UTC date time, formatted in iso8601, with days added | {{ iso8601DateTimePlusDays Request.QueryParam.plusDays }} | 2006-02-02T15:04:05Z |
| The current UTC date time, in the format specified | {{ currentDateTime “2006-Jan-02” }} | 2018-Jul-05 |
| The current UTC date time, in the format specified, with duration added | {{ currentDateTimeAdd “1d” “2006-Jan-02” }} | 2018-Jul-06 |
| The current UTC date time, in the format specified, with duration subtracted | {{ currentDateTimeSubtract “1d” “2006-Jan-02” }} | 2018-Jul-04 |
| A random string | {{ randomString }} | hGfclKjnmwcCds |
| A random string with a specified length | {{ randomStringLength 2 }} | KC |
| A random boolean | {{ randomBoolean }} | true |
| A random integer | {{ randomInteger }} | 42 |
| A random integer within a range | {{ randomIntegerRange 1 10 }} | 7 |
| A random float | {{ randomFloat }} | 42 |
| A random float within a range | {{ randomFloatRange 1.0 10.0 }} | 7.4563213423 |
| A random email address | {{ randomEmail }} | LoriStewart@Photolist.com |
| A random IPv4 address | {{ randomIPv4 }} | 224.36.27.8 |
| A random IPv6 address | {{ randomIPv6 }} | 41d7:daa0:6e97:6fce:411e:681:f86f:e557 |
| A random UUID | {{ randomUuid }} | 7b791f3d-d7f4-4635-8ea1-99568d821562 |
| Replace all occurrences of the old value with the new value in the target string | {{ replace Request.Body “be” “mock” }} (where Request.Body has the value of “to be or not to be” | to mock or not to mock |
Durations¶
When using template helper methods such as currentDateTimeAdd and currentDateTimeSubtract, durations must be formatted following the following syntax for durations.
| Shorthand | Type |
|---|---|
| ns | Nanosecond |
| us/µs | Microsecond |
| ms | Millisecond |
| s | Second |
| m | Minute |
| h | Hour |
| d | Day |
| y | Year |
Example Durations¶
| 5m | 5 minutes |
| 1h30m | 1 hour 5 minutes |
| 1y10d | 1 year 10 days |
Date time formats¶
When using template helper methods such as currentDateTime, currentDateTimeAdd and currentDateTimeSubtract, date time formats must follow
the Golang syntax. More can be found out here https://golang.org/pkg/time/#Parse
Example date time formats¶
| 2006-01-02T15:04:05Z07:00 |
| Mon, 02 Jan 2006 15:04:05 MST |
| Jan _2 15:04:05 |
Conditional Templating, Looping and More¶
Hoverfly uses the https://github.com/aymerick/raymond library for templating, which is based on http://handlebarsjs.com/
To learn about more advanced templating functionality, such as looping and conditionals, read the documentation for these projects.