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13 changes: 13 additions & 0 deletions CHANGELOG.md
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# Changelog

## 0.3.0 (2018-09-01)

* Multiple Solr endpoints configuration and searching
* Apache 2 license

## 0.2.0 (2018-08-31)

* First release.
* Solr search capability


201 changes: 201 additions & 0 deletions LICENSE
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15 changes: 11 additions & 4 deletions README.md
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Expand Up @@ -21,16 +21,23 @@ The above queries the default Solr endpoint - see `Configuration` below.
A query may involves search words (string) or a [keywords list](https://elixir-lang.org/getting-started/keywords-and-maps.html#keyword-lists)
of Solr parameters, invoking the comprehensive and powerful features of Solr.

Queries may also be issued to other endpoints and request handlers, defined in binary or struct format:
Queries may also be issued to other endpoints and request handlers defined in various formats:

```
# URL binary string
Hui.search("http://localhost:8983/solr/collection", q: "loch")
# URL in a struct
url = %Hui.URL{url: "http://localhost:8983/solr/collection", handler: "suggest"}
Hui.search(url, suggest: true, "suggest.dictionary": "mySuggester", "suggest.q": "el")
# URL key referring to an endpoint in configuration - see "Configuration"
url = :library
Hui.search(url, q: "edinburgh", rows: 10)
```

See `Hui.search/1`, `Hui.search/2` and [Solr reference guide](http://lucene.apache.org/solr/guide/7_4/searching.html)
See `Hui.search/1`, `Hui.search/2` in API reference and [Solr reference guide](http://lucene.apache.org/solr/guide/7_4/searching.html)
for more details on available search parameters.

### Software library
Expand Down Expand Up @@ -106,12 +113,12 @@ in different custom or normative names in
[Solr configuration](http://lucene.apache.org/solr/guide/7_4/requesthandlers-and-searchcomponents-in-solrconfig.html#requesthandlers-and-searchcomponents-in-solrconfig),
e.g. "select" for search queries.

Multiple endpoints with different Solr request handlers can be configured in Hui with an arbitrary config key (e.g. `:suggester`):
Multiple different endpoints and request handlers can be configured in Hui with arbitrary config keys (e.g. `:suggester`):

```
config :hui, :suggester,
url: "http://localhost:8983/solr/collection",
handler: "suggest"
```

Use the config key in `Hui.search/2` to send queries to the endpoint or retrieve from configuration e.g. `Hui.URL.config_url(:suggester)`.
Use the config key in `Hui.search/2` to send queries to the endpoint or retrieve from configuration e.g. `Hui.URL.configured_url(:suggester)`.
6 changes: 5 additions & 1 deletion config/config.exs
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Expand Up @@ -11,4 +11,8 @@ config :hui, :default_url, # default endpoint
#
config :hui, :suggester,
url: "http://localhost:8983/solr/collection",
handler: "suggest"
handler: "suggest"

config :hui, :library,
url: "http://localhost:8984/solr/articles",
handler: "dismax"
16 changes: 11 additions & 5 deletions lib/hui.ex
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Expand Up @@ -11,10 +11,10 @@ defmodule Hui do
"""

@type solr_query :: binary | list
@type solr_url :: binary | struct
@type solr_url :: binary | atom | struct

@doc """
Issue a search query to a pre-configured default Solr endpoint.
Issue a search query to the default Solr endpoint.
The query can be a search string or a keywords list of Solr parameters.
Expand All @@ -38,7 +38,10 @@ defmodule Hui do
Issue a search query to a Solr endpoint.
The endpoint can either be a string URL or `t:Hui.URL.t/0` struct which defines
a specific URL and request handler. The query is a keywords list of Solr parameters.
a specific URL and request handler. A key referring to an endpoint in configuration
can also be used.
The query is a keywords list of Solr parameters.
### Example
Expand All @@ -47,14 +50,17 @@ defmodule Hui do
url = %Hui.URL{url: "http://localhost:8983/solr/collection", handler: "suggest"}
Hui.search(url, suggest: true, "suggest.dictionary": "mySuggester", "suggest.q": "el")
url = :library
Hui.search(url, q: "edinburgh", rows: 10)
```
See `Hui.URL.encode_query/1` for more details on Solr parameter keywords list.
See `Hui.URL.configured_url/1` amd `Hui.URL.encode_query/1` for more details on Solr parameter keywords list.
"""
@spec search(solr_url, list) :: {:ok, HTTPoison.Response.t} | {:error, HTTPoison.Error.t} | {:error, String.t}
def search(url, query) when is_binary(url), do: Hui.Search.search(%Hui.URL{url: url}, query)
def search(url, query) when is_map(url), do: Hui.Search.search(url, query)
def search(url, query) when is_map(url) or is_atom(url), do: Hui.Search.search(url, query)
def search(_, _), do: {:error, "malformed query or URL"}

end
27 changes: 22 additions & 5 deletions lib/hui/search.ex
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Expand Up @@ -28,29 +28,46 @@ defmodule Hui.Search do
Hui.Search.search(q: "loch", rows: 5, fq: ["type:illustration", "format:image/jpeg"])
```
See `Hui.URL.encode_query/1` for more details on Solr parameter keywords list.
See `Hui.URL.default_url!/0` and `Hui.URL.encode_query/1` for more details on Solr parameter keywords list.
"""
@spec search(list) :: {:ok, HTTPoison.Response.t} | {:error, HTTPoison.Error.t} | {:error, String.t}
def search(query) when is_list(query), do: search(@default_url, query)
def search(_query), do: {:error, @error_msg}

@doc """
Issues a search query to a Solr URL specified in `t:Hui.URL.t/0` struct.
Issues a search query to a given Solr URL.
The query contains a comprehensive keywords list of Solr parameters.
## Example
The URL can be specified as `t:Hui.URL.t/0`.
```
url = %Hul.URL{url: solr_endpoint}
url = %Hul.URL{url: "http://..."}
Hui.Search.search(url, q: "loch", rows: 5)
```
See `Hui.URL.encode_query/1` for more details on Solr parameter keywords list.
A key for application-configured URL may also be used.
```
url = :suggester
Hui.search(url, suggest: true, "suggest.dictionary": "mySuggester", "suggest.q": "el")
```
See `Hui.URL.configured_url/1` and `Hui.URL.encode_query/1` for more details on Solr parameter keywords list.
"""
@spec search(struct, list) :: {:ok, HTTPoison.Response.t} | {:error, HTTPoison.Error.t} | {:error, String.t}
@spec search(struct|atom, list) :: {:ok, HTTPoison.Response.t} | {:error, HTTPoison.Error.t} | {:error, String.t}
def search(%Hui.URL{url: url, handler: handler}, query), do: exec_search("#{url}/#{handler}", query)
def search(url, query) when is_atom(url) do
{status, url_m} = Hui.URL.configured_url(url)
case status do
:ok -> exec_search(url_m|>Hui.URL.to_string, query)
:error -> {:error, "URL not configured"}
end
end
def search(_, _), do: {:error, @error_msg}

defp exec_search(url, query) do
Expand Down
8 changes: 4 additions & 4 deletions lib/hui/url.ex
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Expand Up @@ -31,7 +31,7 @@ defmodule Hui.URL do
"""
@spec default_url! :: t | nil
def default_url! do
{status, default_url} = config_url(:default_url)
{status, default_url} = configured_url(:default_url)
case status do
:ok -> default_url
:error -> nil
Expand All @@ -43,7 +43,7 @@ defmodule Hui.URL do
## Example
iex> Hui.URL.config_url(:suggester)
iex> Hui.URL.configured_url(:suggester)
{:ok, %Hui.URL{handler: "suggest", url: "http://localhost:8983/solr/collection"}}
The above retrieves the following endpoint configuration e.g. from `config.exs`:
Expand All @@ -55,8 +55,8 @@ defmodule Hui.URL do
```
"""
@spec config_url(atom) :: {:ok, t} | {:error, binary} | nil
def config_url(config_key) do
@spec configured_url(atom) :: {:ok, t} | {:error, binary} | nil
def configured_url(config_key) do
{x, y} = {Application.get_env(:hui, config_key)[:url], Application.get_env(:hui, config_key)[:handler]}
case {x,y} do
{nil, nil} -> {:error, "URL not found in configuration"}
Expand Down
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