Beta release prep
- Modify retry logic to always attempt a reconnect
This commit is contained in:
parent
e8f203ab5f
commit
7be81e3e4b
18
README.md
18
README.md
@ -5,12 +5,11 @@ Idiomatic F# extensions for the C# RethinkDB driver
|
||||
|
||||
## Using
|
||||
|
||||
Install the [NuGet](https://www.nuget.org/packages/RethinkDb.Driver.FSharp/) package `RethinkDb.Driver.FSharp`. You will need to specify pre-release, as the package has an alpha designation at this time.
|
||||
Install the [NuGet](https://www.nuget.org/packages/RethinkDb.Driver.FSharp/) package `RethinkDb.Driver.FSharp`. You will need to specify pre-release, as the package currently has a beta designation.
|
||||
|
||||
## Goals
|
||||
## What It Provides
|
||||
|
||||
The goal is to provide:
|
||||
- A composable pipeline for creating ReQL statements:
|
||||
### A composable pipeline for creating ReQL statements
|
||||
|
||||
```fsharp
|
||||
open RethinkDb.Driver.FSharp.Functions
|
||||
@ -24,7 +23,7 @@ let fetchPost (postId : string) =
|
||||
|> withRetryDefault
|
||||
```
|
||||
|
||||
- An F# domain-specific language (DSL) using a `rethink` computation expression (CE):
|
||||
### An F# domain-specific language (DSL) using a `rethink` computation expression (CE)
|
||||
|
||||
```fsharp
|
||||
open RethinkDb.Driver.FSharp
|
||||
@ -39,7 +38,7 @@ let fetchPost (postId : string) =
|
||||
}
|
||||
```
|
||||
|
||||
- A standard way to translate JSON into a strongly-typed configuration:
|
||||
### A standard way to translate JSON into a strongly-typed configuration
|
||||
|
||||
```fsharp
|
||||
/// type: DataConfig
|
||||
@ -55,15 +54,15 @@ let conn = config.Connect ()
|
||||
let! post = fetchPost "the-post-id" conn
|
||||
```
|
||||
|
||||
- Robust queries
|
||||
### Robust queries
|
||||
|
||||
The RethinkDB connection is generally stored as a singleton. Over time, this connection can lose its connection to the server. Both the CE and functions have `withRetryDefault`, which will retry a failed command up to 3 times (4 counting the initial try), waiting 200ms, 500ms, and 1 second between the respective attempts. There are other options as well; `withRetryOnce` will retry one time immediately. `withRetry` takes a list of `float`s, which will be interpreted as seconds to delay between each retry; it will retry until it has exhausted the delays.
|
||||
|
||||
The examples above both use the default retry logic.
|
||||
|
||||
- Only rename functions/methods where required
|
||||
### Only rename functions/methods where required
|
||||
|
||||
Within the CE, there are a few differing names, mostly notably at the start (selecting databases and tables); this is to allow for a more natural language flow. Its names may change in the 0.8.x series; it is the most alpha part of the project at this point. Also, while CEs now support overloading (thank you F# 6 developers!), they do not detect if the first value in the tupled arguments is different. This is most noticeable once `result*` or `write*` commands have been issued; these support `Task<'T>`, `Async<'T>`, and synchronous `'T` operations, but the follow-on commands will be different (e.x. `withRetryDefault` (tasks) vs. `withAsyncRetryDefault` vs. `withSyncRetryDefault`). There are also versions of these that support optional arguments (for all) and cancellation tokens (for task/async).
|
||||
Within the CE, there are a few differing names, mostly notably at the start (selecting databases and tables); this is to allow for a more natural language flow. Also, while CEs now support overloading (thank you F# 6 developers!), they do not detect if the first value in the tupled arguments is different. This is most noticeable once `result*` or `write*` commands have been issued; these support `Task<'T>`, `Async<'T>`, and synchronous `'T` operations, but the follow-on commands will be different (e.x. `withRetryDefault` (tasks) vs. `withAsyncRetryDefault` vs. `withSyncRetryDefault`). There are also versions of these that support optional arguments (for all) and cancellation tokens (for task/async).
|
||||
|
||||
The functions show this pattern throughout, as functions in a module do not support overloading; an example for `filter` is below.
|
||||
|
||||
@ -88,4 +87,3 @@ license on this project's dependencies. Please see [the heading on the C# driver
|
||||
If you are using the project, feel free to file issues about your pain points; there is no substitute for real-world feedback!
|
||||
|
||||
[license]: https://github.com/bchavez/RethinkDb.Driver#open-source-and-commercial-licensing
|
||||
[nuget]: https://ci.appveyor.com/nuget/danieljsummers-rethinkdb-driver-fsharp
|
80
src/RethinkDb.Driver.FSharp/README.md
Normal file
80
src/RethinkDb.Driver.FSharp/README.md
Normal file
@ -0,0 +1,80 @@
|
||||
## RethinkDb.Driver.FSharp
|
||||
|
||||
This package provides idiomatic F# extensions on the [official C# driver][csharp-pkg]. Within this package:
|
||||
|
||||
### Connection Configuration / Creation
|
||||
|
||||
```fsharp
|
||||
open RethinkDb.Driver.FSharp
|
||||
|
||||
let dataCfg = DataConfig.fromJson "rethink-config.json"
|
||||
// - or -
|
||||
let dataCfg = DataConfig.fromConfiguration [config-section]
|
||||
|
||||
let conn = dataCfg.CreateConnection () // IConnection
|
||||
```
|
||||
|
||||
### Domain-Specific Language (DSL) / Computation Expression (CE) Style
|
||||
|
||||
```fsharp
|
||||
open RethinkDb.Driver.FSharp
|
||||
|
||||
// Remove the conn parameter and usage for point-free style
|
||||
|
||||
let getPost postId conn =
|
||||
rethink<Post> {
|
||||
fromTable "Post"
|
||||
get postId
|
||||
resultOption
|
||||
withRetryOptionDefault conn
|
||||
}
|
||||
|
||||
let updatePost post conn =
|
||||
rethink {
|
||||
fromTable "Post"
|
||||
get post.id
|
||||
update post
|
||||
write
|
||||
ignoreResult
|
||||
withRetryDefault conn
|
||||
}
|
||||
```
|
||||
|
||||
### Function Style
|
||||
|
||||
```fsharp
|
||||
open RethinkDb.Driver.FSharp.Functions
|
||||
|
||||
// NOTE: this returns Task<Post>; checking for null/option is not handled
|
||||
// as it is with the CE version
|
||||
let getPost postId conn =
|
||||
fromTable "Post"
|
||||
|> get postId
|
||||
|> runResult<Post>
|
||||
|> withRetryDefault conn
|
||||
|
||||
// NOTE: this returns Task<Result>; ignoring inline is not available as
|
||||
// it is with the CE version
|
||||
let updatePost post conn =
|
||||
fromTable "Post"
|
||||
|> get post.id
|
||||
|> update post
|
||||
|> runWrite
|
||||
|> withRetryDefault conn
|
||||
```
|
||||
|
||||
### Retry Logic
|
||||
|
||||
The driver does not reconnect automatically when the underlying connection has been interrupted. When specified, the retry logic attempts to reconnect; default retries wait 200ms, 500ms, and 1 second. There are also functions to retry once, and those that allow the intervals to be specified.
|
||||
|
||||
### Strongly-Typed Optional Arguments
|
||||
|
||||
Many RethinkDB commands support optional arguments to tweak the behavior of that command. A quick example using the `between` command (clause):
|
||||
|
||||
```fsharp
|
||||
// ...
|
||||
between 1 100 [ LowerBound Open; UpperBound Closed ]
|
||||
// ...
|
||||
```
|
||||
|
||||
[csharp-pkg]: https://www.nuget.org/packages/RethinkDb.Driver/
|
@ -6,13 +6,14 @@
|
||||
<Authors>Daniel J. Summers</Authors>
|
||||
<PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
|
||||
<PackageProjectUrl>https://github.com/danieljsummers/RethinkDb.Driver.FSharp</PackageProjectUrl>
|
||||
<!-- PackageIconUrl>https://github.com/danieljsummers/RethinkDb.Driver.FSharp/raw/master/icon/icon.png</PackageIconUrl -->
|
||||
<PackageIconUrl>https://github.com/danieljsummers/RethinkDb.Driver.FSharp/raw/main/pkg/icon.png</PackageIconUrl>
|
||||
<PackageIcon>icon.png</PackageIcon>
|
||||
<PackageReadmeFile>README.md</PackageReadmeFile>
|
||||
<PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
|
||||
<Copyright>See LICENSE</Copyright>
|
||||
<PackageTags>RethinkDB document F#</PackageTags>
|
||||
<VersionPrefix>0.8.0</VersionPrefix>
|
||||
<VersionSuffix>alpha-0009</VersionSuffix>
|
||||
<PackageReleaseNotes>Alpha; use at your own risk</PackageReleaseNotes>
|
||||
<VersionPrefix>0.9.0</VersionPrefix>
|
||||
<VersionSuffix>beta-01</VersionSuffix>
|
||||
</PropertyGroup>
|
||||
|
||||
<ItemGroup>
|
||||
@ -21,6 +22,8 @@
|
||||
<Compile Include="Functions.fs" />
|
||||
<Compile Include="Builder.fs" />
|
||||
<Compile Include="Config.fs" />
|
||||
<None Include="README.md" Pack="true" PackagePath="\" />
|
||||
<None Include="icon.png" Pack="true" PackagePath="\" />
|
||||
</ItemGroup>
|
||||
|
||||
<ItemGroup>
|
||||
|
@ -13,12 +13,9 @@ let retryPolicy (intervals : float seq) (conn : IConnection) =
|
||||
.WaitAndRetryAsync(
|
||||
intervals |> Seq.map TimeSpan.FromSeconds,
|
||||
System.Action<exn, TimeSpan, int, Context> (fun ex _ _ _ ->
|
||||
printf $"Encountered RethinkDB exception: {ex.Message}"
|
||||
match ex.Message.Contains "socket" with
|
||||
| true ->
|
||||
printf "Reconnecting to RethinkDB"
|
||||
(conn :?> Connection).Reconnect false
|
||||
| false -> ()))
|
||||
printfn $"Encountered RethinkDB exception: {ex.Message}"
|
||||
printfn "Reconnecting to RethinkDB..."
|
||||
(conn :?> Connection).Reconnect false))
|
||||
|
||||
/// Create a retry policy that attempts to reconnect to RethinkDB when a synchronous operation encounters an error
|
||||
let retryPolicySync (intervals : float seq) (conn : IConnection) =
|
||||
|
BIN
src/RethinkDb.Driver.FSharp/icon.png
Normal file
BIN
src/RethinkDb.Driver.FSharp/icon.png
Normal file
Binary file not shown.
After Width: | Height: | Size: 16 KiB |
Loading…
Reference in New Issue
Block a user